Morphology and development of the male reproductive tract in Callinectes danae (Crustacea: Brachyura)
Acta Zoologica, EarlyView. (Source: Acta Zoologica)
Source: Acta Zoologica - July 9, 2017 Category: Zoology Source Type: research
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Acta Zoologica, Ahead of Print. (Source: Acta Zoologica)
Source: Acta Zoologica - July 9, 2017 Category: Zoology Source Type: research
Hyaluronate likely contributes to the immunesuppression of the regenerating tail blastema in lizards: Implications for organ regeneration in amniotes
Abstract
The regenerating tail blastema of lizards appears immunesuppressed, and the distribution of hyaluronate, a possible agent of immunesuppression, is evaluated. Transcriptome data show upregulation of genes stimulating hyaluronate production in the tail and limb blastemas. The distribution of hyaluronate in the tail and limb blastemas has been studied using alcian blue at pH 2.5 and 1.0 and by immunohistochemistry for hyaluronate receptors. Both tail and limb blastemas initially contain hyaluronate, but this glycosaminoglycan disappears in the scarring limb blastema at 25‐ to 30‐day postamputation after intense i...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Lorenzo Alibardi Tags: ORIGINAL ARTICLE Source Type: research
Functional morphology and neuronal innervation of the prothoracic defence gland in Timema
In this study, the anatomy and innervation of the defence glands in Timema petita and Timema chumash are described and compared with the data on Euphasmatodea. In all phasmids, the glands consist of a cuticular epithelium, a secretory epithelium and muscular fibres that compress the lumen. In Timematodea, the muscular part of the gland is less developed than in Euphasmatodea and the ejection of the defence secretion depends on the dorsal longitudinal neck muscles. On the neuroanatomical level, Timema petita and Timema chumash lack neurons that are involved in the independent contraction of the gland in euphasmids. In both ...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Konrad Stolz Tags: ORIGINAL ARTICLE Source Type: research
Description of the immature stages of two Mononychus species (Coleoptera: Curculionidae: Ceutorhynchinae) and a study of the host preferences of M. punctumalbum for Iris species in central Europe
Abstract
Last larval instars and pupae of Mononychus punctumalbum (Herbst, 1784) and Mononychus schoenherri Kolenati, 1859 (Curculionidae, Ceutorhynchinae) are described in detail for the first time. No immatures of other species of this genus had previously been described. The immatures of Mononychus were compared with available data on immatures of all genera in the subfamily Ceutorhynchinae. Both the larvae and pupae of the two Mononychus species are very distinctive, having distinct characters from other genera in the subfamily Ceutorhynchinae. New bionomic data for M. punctumalbum concerning its host preferences for ...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Ji ří Skuhrovec, Levent Gültekin, Magdalena Śmigala, Krystyna Winiarczyk, Agnieszka Dąbrowska, Rafał Gosik Tags: ORIGINAL ARTICLE Source Type: research
Phenotypic differentiation analysis: A case study in hybridizing Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout (Salmo trutta fario)
Abstract
The aim of this study was to determine and compare the phenotypic variation in Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis), brown trout (Salmo trutta fario) and their native hybrids (S. rizeensis × S. t. fario; S. t. fario × S. coruhensis; S. rizeensis × S. coruhensis). The numbers and diameters of red and black spots were determined on operculum, fins and above and below the lateral line. The results from this study indicate that there were differences in spotting pattern, colour pattern or fin pigmentation traits between S. rizeensis, S. t. fario, S. coruhensis and their hy...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Mehmet Kocaba ş, Filiz Kutluyer, Nadir Başçinar Tags: ORIGINAL ARTICLE Source Type: research
Integument in Antarctic seals: A comparative study and its relation to extreme environments
Abstract
Due to the semi‐aquatic lifestyle of seals and the extreme climates they inhabit, their integumentary system has aroused the curiosity of several authors for more than a century. The aim of this contribution was to perform an exhaustive histological description of the integument Antarctic seals through different methodological approaches in a comparative framework. The species considered include the ice‐obligate—Weddell (Leptonychotes weddellii) and leopard (Hydrurga leptonyx) seal—and the ice‐tolerant, and southern elephant seal (Mirounga leonina). In addition, we attempted to link the histological feat...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Cecilia Mariana Krmpotic, Cleopatra Mara Loza, Javier Negrete, Alejo Carlos Scarano, Alfredo Armando Carlini, Alicia Guerrero, Claudio Gustavo Barbeito Tags: ORIGINAL ARTICLE Source Type: research
The moult cycle of the terrestrial isopod Armadillo officinalis Dum éril, 1816 (Crustacea: Isopoda: Oniscidea)
Abstract
The present work focuses on the moult cycle of Armadillo officinalis. For a 100‐day period, 134 animals were observed and routinely examined with the aim of detecting distinctive morphological characters in the several stages and substages of the moult cycle and of disclosing their duration. Statistical tests and Poisson regression models with robust standard errors were used to investigate differences and relationships between moult and the size and gender of the animals. The appearance of the calcium carbonate deposits on the pereon sternites during the premoult stage was documented in detail, and three main s...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Giuseppe Montesanto, Sofia Cividini Tags: ORIGINAL ARTICLE Source Type: research
Validation of a simple and well ‐suited chemical cleaning method for fish otoliths
Abstract
In marine biology, many research fields are based on use of fish otoliths. All the studies dealing with otoliths need as starting point a perfectly clean otolith. Dissection is difficult when working on small or highly jagged otoliths. A common problem is that during otolith preparation some fish tissue may remain stuck to it, even after a mechanical cleaning. Then, supplementary cleaning with chemicals is needed. Classical methods are known to possibly alter otolith's structure and/or composition. Here, we present a chemical cleaning method using only sodium hydroxide. We have validated the method on two differen...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Pierre S.P. Vandenbussche, Guillaume Spennato, Patrice Francour, Patricia M. Pierson Tags: ORIGINAL ARTICLE Source Type: research
Sense organs in Pycnogonida: A review
Abstract
The Pycnogonida or sea spiders are exclusively marine invertebrates, numbering about 1,300 described species worldwide. Given their remarkable position in phylogeny as basal chelicerates or even basal euarthropods, the structure of their sense organs can reveal important characters, which—in a comparative framework—provide arguments to phylogenetic discussions and help to develop scenarios of evolutionary transformations. This review summarizes current knowledge and presents new original data on the sense organs in pycnogonids, that is, the eyes, the lateral sense organs and the ciliary or sensillar sense orga...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Tobias Lehmann, Martin He ß, Roland R. Melzer Tags: REVIEW Source Type: research
Diplectrum radiale (Quoy & Gaimard, 1824) (Serranidae): A rare case of simultaneous hermaphroditism in a teleost fish
This study generates, for the first time, information on the reproductive traits of the simultaneous hermaphrodite Diplectrum radiale. The specimens were captured bimonthly in two distinct ecosystems along the south‐eastern Brazilian coast. The mature ovotestes were removed, preserved in formalin and examined using histological techniques. The results revealed indeterminate fecundity with asynchronous ovarian organization. All spermatogenesis occurs within cysts, and the spermatogonial distribution indicated an unrestricted testicular type. The testicular and ovarian tissues were separated from each other by different du...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Eudriano F. S. Costa, June F. Dias, Hilario Murua Tags: ORIGINAL ARTICLE Source Type: research
Morphology and development of the male reproductive tract in Callinectes danae (Crustacea: Brachyura)
Abstract
The aim of this study was to characterize the morphology and function of each section of the reproductive system of male Callinectes danae, as well as the stages of reproductive development and their relation to secondary sexual characteristics. Development of their reproductive system begins after completion of the pubertal moult. The growth of the gonopodium showed negative allometry for both juveniles and adults. The reproductive system is divided into portions with different functions. There is a germinal zone in the testes containing spermatogonia, a zone of maturation containing spermatocytes, spermatids or ...
Source: Acta Zoologica - July 1, 2017 Category: Zoology Authors: Renata A. Shinozaki ‐Mendes, Rosângela Lessa Tags: ORIGINAL ARTICLE Source Type: research
