Comparative morphology of the reproductive system of seven species of ostariophysan fishes from the upper Das Velhas River, Brazil

2016 ◽  
Vol 278 (2) ◽  
pp. 170-181 ◽  
Author(s):  
Rafael Magno Costa Melo ◽  
Débora Diniz Gomes ◽  
Davidson Peruci Moreira ◽  
Maysa Regina Gomes ◽  
Nilo Bazzoli ◽  
...  
Keyword(s):  
Reproductive System ◽  
Comparative Morphology ◽  
Ostariophysan Fishes

scholarly journals Mollusca, Gastropoda, Succineidae, Omalonyx unguis (d’Orbigny, 1835): distribution extension and new records for Brazil

Check List ◽  
2011 ◽  
Vol 7 (4) ◽  
pp. 400 ◽  
Author(s):  
Daniel Coscarelli ◽  
Teofânia H. D. A. Vidigal
Keyword(s):  
Reproductive System ◽  
New Records ◽  
Comparative Morphology ◽  
Paraná River ◽  
Mato Grosso ◽  
Parana River ◽  
Paraguay River ◽  
Mato Grosso Do Sul

Omalonyx unguis was previously known to occur in Argentina, Paraguay and Uruguay. We report the first conclusive record of occurrence of this species in Brazil, based on specimens collected in three localities in the Paraguay River sub-basin (Mato Grosso do Sul state – Campo Grande and Miranda; Mato Grosso state – Poconé), and in the Brazilian margin of the Paraná River (Foz do Iguaçu, Paraná State). The species was identified by comparative morphology of the reproductive system, and a map that synthesizes the literature and reports new records is presented.

Comparative morphology of internal reproductive systems in leaf beetles of the Donaciinae and Criocerinae (Coleoptera: Chrysomelidae) and its implication for the phylogeny

Zootaxa ◽  
2008 ◽  
Vol 1845 (1) ◽  
pp. 1 ◽  
Author(s):  
YOKO MATSUMURA ◽  
KUNIO SUZUKI
Keyword(s):  
Phylogenetic Analysis ◽  
Reproductive System ◽  
Comparative Morphology ◽  
Reproductive Organs ◽  
Leaf Beetle ◽  
Reproductive Systems ◽  
Japanese Species ◽  
Morphological Comparison ◽  
Leaf Beetles ◽  
Phylogenetic Hypotheses

We compared the morphology of the internal and external reproductive organs of both sexes among species of the leaf beetle subfamily Donaciinae and its sister taxon Criocerinae. Using nine characters of the reproductive system, we attempted to reconstruct the phylogenetic tree for the two subfamilies combined. For this study, we used 11 Japanese species (including 2 subspecies) of 2 genera in the Donaciinae and 16 Japanese species of 4 genera in the Criocerinae. Morphological comparison revealed that the internal reproductive system exhibits a large diversity even in each subfamily. In particular, the morphology of the spermathecal organ varies greatly among genera or subgenera. In the subgenus Lema, we found a marked apomorphic state, that is, an extremely extended spermathecal duct in females and a similarly extended filiform structure on the internal sac in males. Phylogenetic analysis yielded two most parsimonious trees, which differ in criocerine relationship. In seven of the nine characters, the evolution of an apomorphic state was consistent with previous phylogenetic hypotheses.

Comparative Morphology of Intercellular Bridges Between Developing Germ Cells of the Ovary

1970 ◽  
Vol 28 ◽  
pp. 328-329
Author(s):  
J. R. Ruby ◽  
R. F. Dyer ◽  
R. G. Skalko ◽  
R. F. Gasser ◽  
E. P. Volpe
Keyword(s):  
Germ Cells ◽  
Rana Pipiens ◽  
Comparative Morphology ◽  
Dense Material ◽  
Individual Species ◽  
Microscope Examination ◽  
Electron Dense Material ◽  
Intercellular Bridges ◽  
Cytoplasmic Side ◽  
Intercellular Connections

An electron microscope examination of fetal ovaries has revealed that developing germ cells are connected by intercellular bridges. In this investigation several species have been studied including human, mouse, chicken, and tadpole (Rana pipiens). These studies demonstrate that intercellular connections are similar in morphology regardless of the species.Basically, all bridges are characterized by a band of electron-dense material on the cytoplasmic side of the tri-laminar membrane surrounding the connection (Fig.l). This membrane is continuous with the plasma membrane of the conjoined cells. The dense material, however, never extends beyond the limits of the bridge. Variations in the configuration of intercellular connections were noted in all ovaries studied. However, the bridges in each individual species usually exhibits one structural characteristic seldom found in the others. For example, bridges in the human ovary very often have large blebs projecting from the lateral borders whereas the sides of the connections in the mouse gonad merely demonstrate a slight convexity.

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