DigitalUM :: Browsing by Subject "Morphology"

Browsing by Subject "Morphology"

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Open Access
A study of the catalyst layer morphology generated by electrospray: effect of the voltage and catalyst ink aging on its performance in a proton electrolyte membrane fuel cell
(Elsevier, 2024-11-26) Gómez, Modesto A.; Navarro, Andrés J.; López-Sicilia, Irene; Fernández-Romero, Antonio J.; Santos, Florencio; Molina-García, Ángel; Hernández Cifre, José G.; López-Cascales, José J.; Química Física
Proton electrolyte membrane fuel cells are gaining relevance in different energy sectors as a viable alternative to the use of fossil fuels. Among others, the automotive industry is one of the sectors that has focused a special interest on this technology with the aim of reducing its gas emissions. Thus, with the increase in the production to great scale of proton exchange membrane fuel cells (PEMFC), the amount of catalyst demanded is expected that increase accordingly. In this context, the optimization of both, the composition of the catalyst ink used, and the technique employed for the fabrication of the catalyst layers (CL), are two of the main challenges to be solved in this field. Electrospray is an optimized technique to prepare catalyst layers (CL) for fuel cells. However, aspects such as the voltage applied in the electrospray and the aging of the catalyst inks until its use for the catalyst layer preparation, are some of the key aspects to be studied because they can significantly alter their fuel cell performance. Therefore, this work was focused on studying by cyclic voltammetry, how the voltage used in the electrospray and the ink aging alter the morphology of the catalyst layer and, consequently, their performance in a fuel cell.
Open Access
Absence of relevant effects of 5 mT static magnetic field on morphology, orientation and growth of a rat Schwann cell line in culture
(Murcia : F. Hernández, 2007) Gamboa, O.L.; Gutiérrez, P.M.; Alcalde, I.; De la Fuente, I.; Gayoso, M.J.
The aim of this study is to observe possible changes in the morphology, orientation or cell growth of an in vitro cultured Schwann cell line by 24 h exposure to 5 mT static magnetic fields. The magnetic field generator basically consists of a pair of circular coils in a Helmholtz arrangement and enables temperature to be controlled (37±0.1°C). We did not find any statistically significant differences in the cell growth rate between control and exposed cells, nor did we observe any differences in cell morphology or orientation.
Open Access
Assessment of morphological changes and steroid receptors in the uteri of postmenopausal women
(Universidad de Murcia. Departamento de Biología Celular e Histología, 2019) Teresiński, Leszek; Sipak, Olimpia; Rył, Aleksandra; Masiuk, Marek; Rotter, Iwona; Ratajczak, Weronika; Łazowska, Malwina; Słomczyńska, Maria; Marchlewicz, Mariola; Karakiewicz, Beata; Kram, Andrzej; Laszczyńska, Maria
Introduction. The morphology of the endometrium constantly changes in the reproductive period, depending on the levels of ovarian steroid hormones, and undergoes atrophic changes during menopause as a result of their insufficiency. The purpose of this study was to analyze morphological and morphometric changes in the mucous and muscle layers of the uterine wall in postmenopausal women, and to assess localization and number of cells showing the expression of steroid hormone receptors, namely estrogen receptor α (ER-α), progesterone receptor (PR), and androgen receptor (AR) in glandular epithelial cells and smooth muscle cells in particular groups of women. Material and methods. The study material consisted of uterine specimens sectioned across the full thickness of the uterine wall, and embedded in 164 paraffin blocks. The specimens came from women without menopausal hormone therapy (MHT) operated due to reproductive organ prolapse or uterine myomas. The material was divided into four groups depending on the time interval from menopause to surgery: group I - from 1 to 5 years after menopause, group II - from 6 to 10 years after menopause, group III - more than 11 years after menopause, and group IV - women over 70 years of age. The sections were stained by standard HE, Masson’s trichrome, and immunohistochemical methods (ERα, PR, AR). Quantitative assessment of the results was based on computer image analysis. Results. Analysis of morphological changes in the endometrium and myometrium revealed the presence of increasing regressive changes, such as various types of atrophy, fibrosis, and calcification, augmented over time from the last menstruation. Furthermore, endometrial polyps, foci of endometriosis, and leiomyomas were observed. Based on the results of morphometric measurements, a constant decrease in the endometrial and myometrial thickness was noticed in the studied groups (I-IV). Significant differences between the groups were observed in the number of ER-α positive cells in the myometrium, but not in the endometrial glandular epithelium. Statistically significant differences in the number of AR positive cells were detected in the endometrial epithelium and in the uterine muscle. The analysis the number of PR positive cells demonstrated differences between the groups in the endometrial stroma and the myometrium. Conclusion. The uterus of postmenopausal woman undergo major morphological changes (mainly atrophic lesions in the endometrium and myometrium), leading to a decline in their morphometric parameters over time from the last menstruation. Localization and number of cells showing the expression of steroid receptors: ER-α, PR, and AR in the uterus of postmenopausal women, depending on the time interval from the last menstruation.
Open Access
Bombus (Pyrobombus) Jonellus (Kirby, 1802) (Hy.menoptera: Apidae) anormalmente conformado
(Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Ornosa Gallego, Concepción; Facultad de Biología
A description and d1scussion on the anomalous configuration of a male of Bombus (Pyrobombus) jonellus (Kirby. 1802) whose antennae show a peculiar aspect. being this feature the most outstanding. allhough coloratwn, head punctuation. eighth sternite and genitalia are also abnormal.
Open Access
Comparative study of the eyelids and orbital glands morphology in the okapi (Okapia johnstoni, Giraffidae), Père David's deer (Elaphurus davidianus, Cervidae) and the Philippine mouse-deer (Tragulus nigricans, Tragulidae).
(Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2020) Nawrot, Joanna Elżbieta Klećkowska; Harłajczuk, Karolina Goździewska; Barszcz, Karolina
The accessory organs of the eye represent part of the protective system of the eyeball. In the present study, an examination of the accessory organs of the eye of three species of captive ruminants was performed using light microscopy. In the okapi, the superficial gland of the third eyelid and lacrimal gland were complex branched multilobar tubular glands formed by mucous units with tubular secretory portions and no plasma cells. The deep gland of the third eyelid was absent in the okapi and present in both the Père David’s deer and the Philippine mouse-deer. In the Philippine mouse-deer, the deep gland had a very thick connective capsule and thick interlobar septae. It contained fewer lobes forming the gland parenchyma compared to Père David’s deer and other ruminants. Organized lymphoid follicles were present within the upper and lower eyelids only in the okapi and Père David’s deer, while diffuse lymphocytes were observed in the Philippine mouse-deer. The orbital glands in the Père David’s deer had a multilobar tubuloacinar structure with numerous plasma cells and a mucoserous character. In contrast to the Philippine mouse-deer, these glands had a serous character. The presence of several macroscopic and microscopic structural differences of the examined accessory organs of the eye in the three captive ruminant species may be understood within an ecological context and may be associated with different habitat-specific environmental conditions.
Open Access
Contribution to the knowledge of genus Dociostaurus Fieber, 1853 in the Iberian Peniensula, with special reference to its sound production (Orthoptera:Acridoidea)
(Murcia: Universidad de Murcia, Servicio de Publicaciones, 2005) García García, María Dolores; Larrosa Pérez, Esther; Clemente Espinosa, Eulalia; Presa Asensio, Juan José; Zoología y Antropología Física; Facultad de Biología
Se presenta una revisión de las especies del género Dociostaurus Fieber, 1853 que habitan en la Península Ibérica. Se propone la sinonimia de Dociostaurus monserrati García & Presa, 1984 con Dociostaurus jagoi occidentalis Soltani, 1978. Se aportan datos y figuras de aspectos anatómicos, comolas filas estriduladoras, de machos y de hembras. Se hace especial referencia a la producción de sonido de las distintas especies. Se describen por vez primera los cantos producidos por Dociostaurus crassiusculus (pantel, 1886) y Dociostaurus genei genei (Ocskay, 1832) y se presentan los primeros datos acerca de las características espectrales de todos los sonidos. Se presenta clave de identificación para las especies consideradas.
Open Access
El Diccionario militar (1749) de Raimundo Sanz y la incorporación de galicismos al castellano
(Universitat de Barcelona, 2013) Sánchez Orense, Marta; Lengua Española y Lingüística General
El Diccionario militar, o recolección alphabética de todos los términos propios al Arte de la Guerra(1749), traducción del Dictionnaire militaire, ou recueil alphabetique de tous les termes propres à l'ʹArt de la Guerrede Aubert de la Chesnaye Desbois, obtuvo pésimas consideraciones por parte de escritores posteriores a Raimundo Sanz, su autor, entre otros del lexicógrafo y militar español José Almirante, quien lo tachó de “traducción detestable”. Con este trabajo pretendemos averiguar la veracidad de las críticas vertidas a propósito del elevado número de galicismos que contiene. Para ello, procederemos a examinar el lemario que conforma su macroestructura y a clasificarlo de acuerdo con su procedencia etimológica, a la vez que prestamos especial atención a la fecha de incorporación a nuestra lengua de los préstamos del francés implicados.
Open Access
El estudio de los procedimientos de formación de palabras en el léxico militar moderno: la derivación verbal
(2018-07-23) Sánchez Orense, Marta
El objetivo de este trabajo es el análisis de los mecanismos de derivación verbal que intervienen en la formación de buena parte de la terminología bélica durante la época renacentista española. Para ello nos basamos preferentemente en el corpus del Diccionario de la ciencia y de la técnica del Renacimiento (DICTER), integrado por los trece tratados militares escritos en lengua española más influyentes del siglo XVI y primeros años del XVII, periodo histórico que destaca por el impulso que cobra el lenguaje de la milicia dentro del nuevo estatus científico que conlleva el inicio de la modernidad.Con este trabajo, al profundizar en el estudio de algunos de los mecanismos morfológicos verbales más relevantes en la conformación de los vocabularios especializados, esperamos lograr un mayor y mejor conocimiento del léxico militar español de la época moderna, a la vez que reivindicar la necesidad y la conveniencia de emprender trabajos basados en los corpus.
Open Access
Evolución del concurso de ganaderías “ciudad de segorbe” y valoración de caracteres de comportamiento y morfológicos de los bovinos de lidia según sus criadores
(Facultad de Veterinaria y el Servicio de Publicaciones de la Universidad de Murcia, 2023) Gamón, Maria Jesus; Sanes Vargas, Jose Manuel; Abellán Sánchez, Eliana; Seva Alcaraz, Juan; Facultad de Veterinaria
El concurso de ganaderías celebrado en la Semana Taurina de Segorbe nace en 1985, es el más antiguo (36 ediciones), y de los más importantes de España. El objetivo del presente trabajo es determinar su evolu-ción hasta el formato actual con los cambios surgidos a fin de adaptar estos “bous al carrer” a los gustos de la sociedad y bienestar animal, y valorar determinadas características zootécnicas de los animales que participan en estos espectáculos según la opinión de sus criadores. Se observa una evolución positiva del concurso, ya que ha pasado a tener carácter nacional, aumentado el número de festejos y mejorado las condiciones para el bienestar animal, al disminuir los tiempos de concurso de las reses. Para el conocimiento de los caracteres de comportamiento de las vacas y toros que participan en el concurso se realizaron encuestas a los ganaderos más laureados, principales protagonistas de su selección. Son numerosos los cruces de diversos encastes de la raza de lidia empleados por las ganaderías, principalmente casta Navarra y Gamero-Cívico. En cuanto al comporta-miento general de las reses del concurso, las vacas rematan en rateras y trabajan los obstáculos, sobre todo las escaleras, con mucha movilidad siempre buscando al rodador, con fijeza y sin rehusar la pelea; el toro en puntasembiste, presenta movilidad, no huye de la presión de los rodadores y pega en los barrotes al mismo tiempo que acude con prontitud a los cites y, el toro embolado se mueve mucho, recorre todo el recinto taurino y se deja ver, tiene astucia, con buenas arrancadas al embestir y rebaña en rateras. Morfológicamente las vacas son fuertes con buena condición corporal y grandes encornaduras, los toros en puntas son grandes, con presencia, buenos aplomos y encornaduras desarrolladas; asimismo, el toro embolado es grande, presentando morrillo y encornaduras desarrolladas
Open Access
Histological and morphometrical evaluation of the urethral wall after bioresorbable stent implantation in male New Zealand White Rabbits: A preliminary study
(Universidad de Murcia. Departamento de Biología Celular e Histología, 2024) Skonieczna-Kurpiel, Joanna; Madej, Jan P.; Klekiel, Tomasz; Mackiewicz, Agnieszka; Będziński, Romuald; Noszczyk-Nowak, Agnieszka; Piasecki, Tomasz
The aim of the study was the histological and morphometrical evaluation of the urethral wall at three time points after bioresorbable stent implantation in male New Zealand White Rabbits. The research was performed on 26 male New Zealand White rabbits aged 3-4 months and weighing 2.1-3.0 kg. Two models of bioresorbable sodium alginate-based stents were developed and implanted into the urethral lumen for one (T1), three (T3), and six weeks (T6). Sections of 5 µm thickness were cut from the urethra at intervals of 2 mm. The sliced sections were stained with hematoxylin-eosin (H&E), Van Gieson's (VG), Von Kossa, and Movat– Russell modified pentachrome (MOVAT) staining methods. The study provided valuable information for future models of urethral stents. The first model of the stent failed to fit the requirements due to inadequate mechanical properties. It curled up on itself losing the ability to adhere to the animals’ urethra and was bioresorbed three weeks after implantation. The more rigid no. 2 stent was effective in widening the urethral lumen but did not biodegrade during the experiment. A comprehensive assessment of the second model’s properties of biosorption and biointegration requires an extended observation of at least 12 months for an in depth morphological analysis. Stent migration is not likely to be caused solely by the mechanical properties of the urethra or urinary flow but mainly by muscle contraction of the organ wall.
Open Access
Idiopathic pulmonary fibrosis: Are any of the morphological-molecular markers useful in clinical management?
(Universidad de Murcia. Departamento de Biología Celular e Histología, 2017) Lunardi, Francesca; Balestro, Elisabetta; Nannini, Nazarena; Vuljan, Stefania Edith; Rea, Federico; Calabrese, Fiorella
Idiopathic pulmonary fibrosis (IPF), the most common form of chronic interstitial lung disease, is a severe progressive fibrotic disorder of unknown aetiology. The disease has a heterogeneous clinical course, with frequent poor prognosis, similar to malignant disease. Correctly diagnosing IPF has become particularly important in view of the availability of more precise therapeutic indications, thus avoiding steroid treatment and allowing new approaches with novel drugs. To date we have limited information about biomarkers predictive of progressive disease and associated complications. Efforts should be made in the future to more appropriately study lung tissue and then to extrapolate the most clinically fitting biomarkers. This approach is already used in routine management of many cancers and provides a potential road map for more appropriate clinical care of IPF. This review will mainly focus on histology and etiopathogenesis highlighting some morphological and molecular features that may influence the overall management of IPF.
Open Access
Influencia de las Herramientas Tecnológicas en la Enseñanza de la Morfología en la Educación Médica: Una revisión sistemática
(Universidad de Murcia. Servicio de publicaciones, 2024) Ampuero Valenzuela, I. Paz; Riquelme Vilches, Valentina; Vargas Zurita, Eduardo; Araya Figueroa, Sofía; Cozzi Ahumada, Renata; Riquelme Bahamondes, Camila; Herrera Alcaino, Álvaro
Antecedentes: La integración de la tecnología en la educación médica ha transformado significativamente la enseñanza de la morfología, una disciplina fundamental en las ciencias de la salud. El objetivo de esta revisión sistemática es descubrir las herramientas tecnológicas que se reportan en la literatura para la enseñanza de la morfología en la educación médica y evaluar su influencia en los estudiantes. Métodos: Se llevó a cabo una revisión sistemática siguiendo las directrices PRISMA 2020. Las búsquedas se realizaron en las bases de datos Web of Science ySCOPUS, enfocándose en estudios publicados entre 2009 y 2024. Se incluyeron artículos que examinaran el uso de la tecnología en la enseñanza de la morfología y que proporcionaran resultados cuantitativos o cualitativos comparando el uso de tecnología con métodos tradicionales.Resultados: Se identificaron un total de 87 artículos, de los cuales 12 estudios fueron incluidos en el análisis final. El uso de microscopios digitales y virtuales, modelos 3D, plataformas interactivas y recursos en línea mostró una mejora significativa en el rendimiento académico y la satisfacción de los estudiantes. Además, estas tecnologías mejoraron las habilidades técnicas y espaciales,promoviendo la participación activa y la autonomía estudiantil. Sin embargo, dos estudios no reportaron diferencias significativas en los resultados académicos. Conclusiones: La literatura reporta una influencia positiva en el aprendizaje de la morfología, mejorando aspectos como rendimiento académico y la participación estudiantil. Las futuras investigaciones deberían enfocarse en los impactos a largo plazo y en enfoques personalizados para optimizar el uso de la tecnología en la educación médica.
Open Access
Microvascular pericytes, a review of their morphological and functional characteristics
(Murcia : F. Hernández, 1991) Díaz-Flores, Lucio; Gutiérrez, Ricardo; Varela, Hilda; Rancel, N.; Valladares, Francisco
A hundred years after the first description, niany aspects of pericytes reniain to be examined. Mesenchymal in origin, pericytes form an incomplete envelopment around the endothelial cells and within the microvascular basement niernhrane of capillaries and postcapillary venules. Morphologically. they appear as long, slender, polymorphic cells. showing an elongated cell body, from which arise longitudinal and circumferential branches. Cell bodies and cytoplasmic processes of pericytes. as well as the endothelial cells, are enveloped by the same basal lamina. except for where they make direct contacts with each other. The pericytet endothelial cell contacts are peg and socket. adlicsion plaques and gap junctions. making up structural mechanisms for force transmission and a possible receptor system for cells, in which the pcricyte and endothelial cells I-espond to secondary signals generated in the other cells. Electron niicroscopic studies have revealed an elaborate network of cytoplasmic filaments. Pericytc intermediate filament proteins show species and tissue differences. expressing vimentin or vimentin and desmin. The pericytes also express protein typical of contractile cells, i.e. smooth muscle-specific isoforms of actin and myosin, cyclic GMP-protein kinase and tropomyosin. A gradual transition is observed between pericytes and smooth muscle cells in both terminal a-terioles and venules. Several general functions for the pericytes have been postulated: contractability: permeability regulator: integrity maintainer; endothelial cell growth modulator; and cell progenitor with considerable mesenchymal potential.
Open Access
Morfología y anatomía de núculas de Origanum L. (Lamiaceae) del suroeste de España
(Murcia: Universidad de Murcia, Servicio de Publicaciones, 2005) Martín Mosquero, María Ángeles; Juan, Rocío; Pastor, Julio; Sin departamento asociado; Facultad de Biología
Se han realizado observaciones tanto al microscopio óptico como al electrónico de barrido, de las especies de Origanum presentes en el suroeste de España: O. majorana L., O. virens Hoffmanns & Link y O. compactum Benth. Las núculas han mostrado una considerable uni formidad desde un punto de vista anatómico. Sin embargo, estas es- pecies se pueden diferenciar atendiendo a caracteres morfológicos como la ornamentación, la simetría, o la presencia/ausencia de papi- las. El mucílago se caracteriza por su excreción discontínua y su es- casa consistencia. Finalmente se comenta acerca de la dispersión balística de las núculas.
Open Access
Morphological and biochemical alterations in growing rats induced by etretinate
(Murcia : F. Hernández, 1989) Amo Bernal, C.; Mendez Sanchez, A.; Sinisterra Gago, J.V.; Sierra Plana, M.A.; Fuentes Garcia, A.
Etretinate is an aromatic retinoid extensively used on Dermatology. Its toxic effects, however, reduce its application from a clinical point of view. In the present paper, we study etretinate intoxication of 48 growing Wistar rats. The intoxication was for 12 weeks using etretinate doses of 0.5 and 6 (mglkg) / day. The concentrations of etretinate in plasma and liver were determined. Total seric cholesterol and triglyceride concentrations were analyzed. Structural and ultrastructural histological studies of liver samples were carried out. Continuous etretinate ingestions seem to produce an alteration in the detoxication of enzymatic complexes in the growing rats with both the concentrations, due to the increase in etretinate blood plasma observed during the study. There is a relationship between the etretinate dose and its blood plasma concentration and toxic effect, but there is not with etretinate concentration in the liver. The blood plasma concentration of cholesterol and triglycerides is not related to histological liver lesions. The histological study confirms hepatotoxicity with both doses. Nevertheless, the anatomopathological lesions observed do not seem to be related to the blood plasma and liver etretinate concentrations.
Open Access
Morphological and histochemical changes in the dromedary camel epididymis in relation to reproductive activity
(Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2021) Ibrahim, Zarroug Hassan; Al-Kheraije, Khalid Ali; Singh, Shio Kumar
Environmental conditions such as temperature, light and food availability are known to influence the physiological status of animals. The male dromedary camel (Camelus dromedarius) is considered as a seasonal breeder with maximal sexual activity during certain period of the year followed by a decrease in activity during the remaining period. On the other hand, the male camel is also shown as an atypical seasonal breeder because this does not undergo sexual quiescence with complete cessation of spermatogenesis. This animal, however, shows remarkable physiological and behavioral changes during its maximal sexual activity. The annual breeding (rutting) period also influences the epididymis. In this review, an attempt has been made to present the available literature pertaining to gross anatomical, histological, histochemical, immunohisto-chemical and molecular changes in camel epididymis during breeding and nonbreeding periods, and the changes are believed to be correlated with male sexual behavior and libido. This review may also exhibit the dromedary camel breeding period, which is still unresolved, and thus may prove helpful in determining the exact time of mating, which is important for the success of assisted reproductive outcomes. Further, the review may contribute to a better understanding of the epididymal physiology in camel and may also prove useful in improving reproductive efficiency and population of this animal
Open Access
Morphological and morphometrical study on the dorsal skin of Wistar and WBNIILA-Ht rats in their developing stage.
(Murcia : F. Hernández, 1998) Iwamoto, S.; Nakayama, Hiroyuki; Doi, K.
The detailed histology of the dorsal skin of Wistar-derived hypotrichotic WBNIILA-Ht rats (HtRs) was examined in their developing stage (at 3 and 7 weeks of age) using Wistar rats (WRs) as controls. As a result, except for the existence of time-lag in the hair follicular cycle and some quantitative differences, there were no essential qualitative differences between the two strains. The follicular epithelial cell number and the amounts of tonofilaments and trichohyalin granules were less in HtRs than in WRs in the same phase of hair follicular cycle. In addition, the diameter of hair shaft was significantly larger in WRs than in HtRs at 7 weeks of age. The number of proliferating cell nuclear antigen (PCNA)-positive epidermal basal cells decreased in HtRs and increased in WRs from 3 to 7 weeks of age, respectively. Apoptosis was sparsely observed in the sebaceous gland epithelia1 cells, keratinizing portion of hair cuticules and inner root sheath in both strains, but the frequency of apoptosis in the hair follicle was somewhat higher in 7-week-old HtRs. HtRs are considered to be useful experimental animals for dermatotoxicological studies.
Open Access
Morphological changes in microglia in the mouse brain during postnatal development and obesity
(2026) Chu Zhang; Ge Gao; Xiaonan Shao; YJing Kang; Xin Yan; Juntang Lin; Liang Qiao; Yang Li1; Biología Celular e Histología
Microglia are innate immune cells in the central nervous system (CNS) and play critical roles in proper brain development and function. During postnatal development, microglia have a highly plastic morphology and change rapidly in response to the temporal brain environment. However, their dynamics and phenotypes during this period are still not fully elucidated. Here, we systematically elucidated microglial density and morphological changes during postnatal development as well as in pathological obese conditions. Our results demonstrated a spatiotemporal distribution of microglia in different brain regions associated with gradually increased microglial complexity during postnatal development. Moreover, microglia become reactive in most brain regions of obese mice, but their morphological diversity has a region-specific manner, with an obvious alteration in the hypothalamus. Overall, our data emphasized the morphological dynamics of microglia following developing time windows and provided the basic information for future investigations.
Open Access
Morphology and feeding biology of larvae of the South African endemic water beetle genus Prosthetops Waterhouse, 1879 (Coleoptera: Hydraenidae).
(2024) Delgado, Juan A.; Bilton, David T.; Zoología y Antropología Física
The larvae of three species of the South African endemic water beetle genus Prosthetops Waterhouse, 1879 are described and illustrated for the first time. The second and third instar larvae of Prosthetops nitens (Péringuey, 1892), as well as third instar larva of P. megacephalus (Boheman, 1851) and P. wolfbergensis Bilton, 2013, are treated here. These three species share a combination of morphological and chaetotaxic characters that can be used for positive identification of larvae of this genus: head capsule with pores FC1 present, second antennomeres with two well-developed distal sensory appendages, maxillary seta Cdo1 very reduced, thoracic subprimary setae Dd’ absent, subprimary setae Dc’ minute and inserted on the boundary between pretergal and tergal areas, urogomphi moderately separated at the base, anal lobe with well-developed dorsal, lateral and ventral plates, and a lack of anal hooks. Some insights on the gut-contents of the larva of P. wolfbergensis are offered and an unusual urogomphal malformation observed in a larva of P. nitens is also described and illustrated. These are the first described larvae of the subfamily Prosthetopinae, and their morphology is compared to that of other known hydraenid larvae.
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Stephanodictyon borneense (Pottiaceae, Bryophyta): new combination, typification and update of distribution
(Taylor and Francis Group, 2018-01-04) Alonso García, Marta; Cano Bernabé, María Jesús; Jiménez Fernández, Juan Antonio; Biología Vegetal
Stephanodictyon borneense was described by Dixon and later combined to Trichostomum by Zander. Until now, it had been considered endemic to Malaysia, known only from the type locality on Lobang, Kinabalu (Sabah state). Here, its taxonomic position is assessed based on morphological data. Our results suggest that the combination into the genus Chionoloma is required. Moreover, typification is performed and its distribution is increased. Stephanodictyon borneense is, therefore, newly reported for South and Central America (Colombia, Costa Rica, Haiti and Venezuela), for some Asiatic countries (India, Japan and Nepal) and for Papua New Guinea. Despite these new reports, S. borneense is a rare species with a highly scattered distribution.