Morphological characterisation of the digestive tract of the catfish Lophiosilurus alexandri Steindachner, 1876 (Siluriformes, Pseudopimelodidae)
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - October 6, 2017 Category: Zoology Source Type: research
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Acta Zoologica, Ahead of Print. (Source: Acta Zoologica)
Source: Acta Zoologica - October 6, 2017 Category: Zoology Source Type: research
Epidermal Growth Factor and EGF Receptors are mainly expressed in the wound epidermis and proliferating ependyma of the regenerating tail of lizards
Abstract
The presence of EGF and its receptor during tail regeneration in lizard has been assessed by immunoblotting and immunofluorescence to test whether this growth factor may be involved in the process. Immunolabelled bands at 8 and 42–46 kDa for EGF are detected in the regenerating tail. A main band at 45–50 kDa and other weaker bands at lower or higher molecular weight for the EGF receptor are also present. The results indicate that degraded forms of the protein are present although the specific nature of the different bands could not be determined. Immunofluorescence indicates that EGF‐labelled cells and EGF...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Lorenzo Alibardi Tags: ORIGINAL ARTICLE Source Type: research
Gross anatomical and histomorphological features of the Acanthopagrus schlegelii digestive tract (Bleeker 1854) Perciformes, Sparidae
Abstract
Acanthopagrus schlegelii is an autochthonous teleost species concerning the remarkable economic importance and prevalent fish cultivated in China as well as in different nations of South‐East Asia. Little is known about the digestive tract (DT) morphology of A. schlegelii. Therefore, anatomical and histomorphological aspects of A. schlegelii DT were examined by light and scanning electron microscope (SEM). Anatomically, DT of A. schlegelii was mainly formed of oesophagus, well‐developed stomach and fingers like pyloric caeca (four in number), intestinal regions and rectum. Histomorphologically, oesophagus o...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Hameeda Kalhoro, Shengli Tong, Lei Wang, Ying Hua, Josie Ancella Volatiana, Qingjun Shao Tags: ORIGINAL ARTICLE Source Type: research
Analysis of the spatio ‐temporal parameters of gaits in Dasypus novemcinctus (Xenarthra: Dasypodidae)
Abstract
Armadillos comprise a particular group of armoured animals whose functional morphology of locomotion remains unclear. For the first time, the kinematic patterns of Dasypus novemcinctus are analysed. Eight specimens of nine‐banded armadillos were studied at a research institute in São Paulo State, Brazil. The individuals were induced to cross a horizontal corridor and each gait performed during the time each of them was kept inside this structure was recorded to a detailed analysis posteriorly performed in a computer program. Four parameters regarding speed range were considered: stride frequency (Hz) (1/stride ...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Fabiana R. Costa, Giannina P. Clerici, Leonardo Lobo ‐Ribeiro, Patrícia S. Rosa, Oscar Rocha‐Barbosa Tags: ORIGINAL ARTICLE Source Type: research
Spermatogenesis in Sceloporus variabilis (Squamata, Phrynosomatidae): A non ‐quiescent pattern
Abstract
Gaining a deeper understanding of spermatogenic cycles within squamates has aided in our knowledge of the controls of reproduction and has bettered our understanding of reproductive phenology. One of the most studied genera of squamates, Sceloporus, is widely distributed along a latitudinal and elevational gradient in temperate, tropical, low‐elevation and high‐elevation habitats. Due to this wide distribution and varying habitats, Sceloporus exhibit differences in their spermatogenic activity (including both cyclical and acyclical patterns) and may be one of the most useful genera for understanding the abioti...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Gisela Granados ‐González, Maricela Villagrán‐SantaCruz, Eric Peña‐Herrera, Justin L. Rheubert, Kevin M. Gribbins, Oswaldo Hernández‐Gallegos Tags: ORIGINAL ARTICLE Source Type: research
Morphological characteristics of the papillae and lingual epithelium of guinea pig (Cavia porcellus)
Abstract
The structural elements, tridimensional aspects of the lingual papillae, yours connective tissue cores (CTCs) and the ultrastructure of the dorsal epithelium surface of the tongue of guinea pig are examined. Filiform papillae and their CTCs lie throughout the tongue surface, featuring subtypes and different shapes. Fungiform papillae are dome‐shaped, and their CTCs are few, with heterogenic disposition among the filiform papillae in the lingual apex and body and in grooves stretching to the side margin among the foliate papillae towards the lingual apex. Foliate papillae are well developed, and their CTCs are co...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Adriano Polican Ciena, Amilton Cesar dos Santos, Bruno Gomes Vasconcelos, Rose Eli Grassi Rici, Ant ônio Chaves Assis Neto, Sonia Regina Yokomizo Almeida, Maria Angélica Miglino, Ii‐sei Watanabe Tags: ORIGINAL ARTICLE Source Type: research
Reproductive cycle of the oviparous lizard Sceloporus jalapae, from Zapotitl án Salinas, Puebla, Mexico
Abstract
Reproductive patterns vary widely among species and populations of squamates. In general, patterns can be divided into cyclic and acyclic. Cyclic patterns are common in tropical and temperate species of seasonal environments, while acyclic ones are characteristic of tropical species that inhabit less variable environments. We studied the reproductive cycle of Sceloporus jalapae, one of the smallest species of Sceloporus, in an arid environment at Zapotitlán Salinas, Puebla, Mexico. Both sexes mature in the first year following hatching and exhibit a seasonal reproductive pattern with maximum activity in spring an...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Jorge E. Gonz ález‐Espinoza, Julio A. Lemos‐Espinal, Norma L. Manríquez‐Morán, Guillermo Woolrich‐Piña Tags: ORIGINAL ARTICLE Source Type: research
Dynamic intra ‐epidermal bodies (IEBs) in koi epidermis
Abstract
Koi scale epidermis contains large intra‐epidermal bodies (IEBs). IEBs are dynamic and circular structures that form in low frequency within the epidermis. During formation, an IEB pulls down the microridge‐laden surface layer, which takes on a creased or wrinkled appearance. After the IEB constricts, the microridge layer unfolds to its original state. The newly described IEBs are distinctly different from the recently reported apical rings which are situated on the surface of individual epidermal cells. While apical rings are directly exposed to the external environment where sampling can occur, IEBs appear t...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Joseph A. DePasquale Tags: ORIGINAL ARTICLE Source Type: research
The differences in the eyelids microstructure and the conjunctiva ‐associated lymphoid tissue between selected ornamental and wild birds as a result of adaptation to their habitat
Abstract
The aim of the study was to describe the morphology of the upper, lower and third eyelid and characterize the organized lymphoid follicles and diffuse lymphocytes from ornamental and wild birds. The goal of these examinations was also to identify avian conjunctiva‐associated lymphoid tissue (CALT) and lymphoid tissue that contained specialized high endothelial venules. The upper, lower and third eyelid from 30 species of ornamental and wild birds representing 21 families were examined under light microscopy and using scanning electron microscopy. The third eyelid in all of the examined birds was composed of a fr...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Joanna E. Kle ćkowska‐Nawrot, Karolina Goździewska‐Harłajczuk, Dariusz Łupicki, Krzysztof Marycz, Tomasz Nawara, Karolina Barszcz, Artur Kowalczyk, Joanna Rosenberger, Ewa Łukaszewicz Tags: ORIGINAL ARTICLE Source Type: research
Ontogenetic allometry of the digital rays of the leopard gecko (Gekkota: Eublepharidae; Eublepharis macularius)
Abstract
The role of allometry in producing the variation in autopodial morphology observed among the lizards is not well understood. Allometry of metapodial and digit lengths in the manus and pes of the primitively padless gekkotan (Eublepharis macularius) is explored using maximum‐likelihood repeated‐measures ANCOVAs with body length as the covariate. Estimated variance–covariance matrices differed significantly within and between autopodia, and integration was stronger among the metapodials than the digits. The first metapodial and the first digit of each autopodium exhibit the strongest covariances with each of t...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: George Lawrence Powell, Geoffrey J. Osgood, Anthony P. Russell Tags: ORIGINAL ARTICLE Source Type: research
Morphological characterisation of the digestive tract of the catfish Lophiosilurus alexandri Steindachner, 1876 (Siluriformes, Pseudopimelodidae)
Abstract
The anatomical arrangement of the digestive tract and the length (cm) of the oesophagus and intestine of the catfish Lophiosilurus alexandri were described, and the intestinal coefficient was determined. L. alexandri oesophagus is short, in median position, and presents longitudinally folded mucosa, whilst its epithelium is stratified and non‐keratinised, with mucous, claviform and epithelial cells. Stomach has “C” shape, with folded mucosa along cardiac region, disordered in the fundic region, and directed to the sphincter in the pyloric region. Its epithelium is simple prismatic, and cardiac and fundic po...
Source: Acta Zoologica - October 1, 2017 Category: Zoology Authors: Gabriel C. G. Mello, Marcella L. Santos, F ábio P. Arantes, Thiago C. Pessali, Marcelo F. G. Brito, José E. Santos Tags: ORIGINAL ARTICLE Source Type: research
