The urogenital papilla in the Holarctic lamprey (Petromyzontidae)

1988 ◽  
pp. 37-44 ◽  
Author(s):  
Edward Kott ◽  
Claude B. Renaud ◽  
Vadim D. Vladykov
Keyword(s):  
Urogenital Papilla

Callogobius winterbottomi, a new species of goby (Teleostei: Gobiidae) from the Western Indian Ocean

Zootaxa ◽  
2013 ◽  
Vol 3630 (1) ◽  
pp. 155-164 ◽  
Author(s):  
NAOMI R. DELVENTHAL ◽  
RANDALL D. MOOI
Keyword(s):  
South Africa ◽  
New Species ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Caudal Peduncle ◽  
Additional Specimen ◽  
Group A ◽  
Urogenital Papilla ◽  
A New Species

Callogobius winterbottomi new species is described from the 33.8 mm SL holotype and two paratypes (32.2 mm SL and 22.9 mm SL) from the Comoros, Western Indian Ocean. It is distinguished from all other known Callogobius species by the following combination of characters: sensory pores absent, 23–26 scales in lateral series, and sensory papillae pre-opercular row not continuous with transverse opercular row. One additional specimen of Callogobius winterbottomi was located from South Africa. A new standardized naming system for Callogobius sensory papillae rows is presented for identification and clarification of character states among Callogobius species. The new species is tentatively placed among what we term the “sclateri group”, a clade including C. sclateri (Steindachner) and three other species that exhibit a modified female urogenital papilla with lateral distal flaps and elongate ctenii on the caudal peduncle scales. Callogobius tutuilae (Jordan & Seale) is removed from synonymy with C. sclateri because it has partially united pelvic fins (vs separate) and the preopercular sensory papillae row is continuous with the transverse opercular row (vs separate).

scholarly journals Resumption of spermatogenesis in senescent goldfish Carassius auratus (Linnaeus, 1758) through spermatogonial cell therapy

2018 ◽  
Author(s):  
Sullip Kumar Majhi ◽  
Labrechai Mog Chowdhury ◽  
Santosh Kumar ◽  
Rajeev Kumar Singh ◽  
Vindhya Mohindra ◽  
...  
Keyword(s):  
Stem Cell ◽  
Cell Therapy ◽  
Stem Cell Therapy ◽  
Fish Species ◽  
Carassius Auratus ◽  
Endangered Fish ◽  
Goldfish Carassius Auratus ◽  
Male Donor ◽  
Manual Pressure ◽  
Urogenital Papilla

AbstractIn recent times, stem cell research has gained considerable prominence because of its applications in assisted reproductive technology and the treatment of deadly diseases. In teleost fishes, spermatogonial stem cells have been effectively used to produce progeny of difficult-to-breed fish species and/or commercially valuable species through the surrogacy technique. The present study is the first report of an innovative application of stem cell therapy in teleostean fish species for revitalising the reproductive competence of senescent individuals. Senescent male goldfish, Carassius auratus aged approximately 10 years were procured from an ornamental fish-breeding farm and were reared locally for an additional 2 years. The senescence of the fish was evaluated and confirmed using histological analysis, gonadal index assessment, and germ-cell specific vasa gene expression. Analyses revealed the absence of spermatogonial cells and other germ cells in the testes of the senescent fish (n = 5). Spermatogonial cells from a prepubertal C. auratus male donor were isolated using discontinuous percoll gradients, labelled with the fluorescent dye PKH-26, and transplanted into the gonads of senescent C. auratus males through the urogenital papilla. Six months after the therapy, spermatozoa from males were collected through applying gentle manual pressure on the abdomen and were observed under the microscope. All the senescent therapy-treated C. auratus males produced spermatozoa from the transplanted cells; this was confirmed by retention of PKH-26 in the spermatozoa and diagnostic SSR locus. The senescent males were crossed with gravid C. auratus females through artificial insemination and natural spawning, and viable progeny was produced. These observations suggest that the reproductive competence of senescent individuals of commercially valuable and/or endangered fish species can be revitalised and extended through spermatogonia stem cell therapy to produce functional gametes.

scholarly journals Geographic distribution of Phalloceros Eigenmann, 1907 (Cyprinodontiformes, Poeciliidae) in the Ilha Grande Bay Hydrographic Region, Rio de Janeiro, Brazil

Check List ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 181-192
Author(s):  
Igor Cavalcanti de Araújo Souto-Santos ◽  
Gustavo Andrés Ferraro ◽  
William Bryan Jennings ◽  
Gabriela Lucia da Silva Vergara ◽  
Paulo Andreas Buckup
Keyword(s):  
Geographic Distribution ◽  
Rio De Janeiro ◽  
Southeastern Brazil ◽  
Geographic Ranges ◽  
First Time ◽  
Urogenital Papilla

The diversity and geographic distribution of Phalloceros Eigenmann, 1907 in the Ilha Grande Bay Hydrographic Region, in southeastern Brazil, is investigated. Examination of 81 samples revealed the presence of 5 species in the region: Phalloceros anisophallos Lucinda, 2008, P. aspilos Lucinda, 2008, P. enneaktinos Lucinda, 2008, P. harpagos Lucinda, 2008, and P. tupinamba Lucinda, 2008. Phalloceros harpagos and P. tupinamba are recorded for the first time in the area. The geographic ranges of P. anisophallos and P. enneaktinos are expanded. The 5 species belong to 3 distinct morphologies of the female urogenital papilla. Species from these distinct morphological lineages may occur sympatrically, but species within the same lineage are always allopatric. A key for the identification of these species is provided.

Reproduction in Australian Pearl Oysters (Lamellibranchia). I. Pinctada albina (Lamarck): Gametogenesis

1958 ◽  
Vol 9 (1) ◽  
pp. 135 ◽  
Author(s):  
DJ Tranter
Keyword(s):  
Germ Cells ◽  
The Body ◽  
First Year ◽  
Visceral Mass ◽  
Male And Female ◽  
Pearl Oysters ◽  
Sexually Mature ◽  
Development Proceeds ◽  
Urogenital Papilla ◽  
Do So

The primary gonad of Pinctada albina consists of paired systems of confluent tubules ("follicles") opening to the exterior at laterally situated urogenital openings. There are no morphologically differentiated gonoducts; the gonads empty into a short ciliated genital vestibule through the primary gonad follicles. A duct from each kidney enters each vestibule just inside the urogenital papilla. There is no superficial difference between the gonads of male and female, except in colour: the testis is cream and the ovary yellow. The follicles originate in the connective tissue behind the openings, and spread through the space between external epithelium and viscera, by invagination, branching, and ramification. As they do so they carry with them, attached to the follicle walls, the primary germ cells ("stem cells"). There are four main follicular systems on each side of the body, but as development proceeds they tend to coalesce. Soon the gonad loses its bilateral appearance and envelops the whole visceral mass. The species becomes sexually mature in its first year, often within 4 or 5 months.

Regional morphology and mucus composition in the urogenital papilla skin of the blackbelly rosefish Helicolenus dactylopterus (Delaroche, 1809)

2018 ◽  
Vol 189 ◽  
pp. 119-127 ◽  
Author(s):  
Gianluca Accogli ◽  
Letizia Sion ◽  
Porzia Maiorano ◽  
Francesca Capezzuto ◽  
Gianfranco D’Onghia ◽  
...  
Keyword(s):  
Helicolenus Dactylopterus ◽  
Urogenital Papilla

Description of two new species of Hetereleotris (Gobiidae) from the south Pacific, with a revised key to species and synonymization of the genus Pascua with Hetereleotris

Zootaxa ◽  
2005 ◽  
Vol 1096 (1) ◽  
pp. 1 ◽  
Author(s):  
DOUGLASS F. HOESE ◽  
HELEN K. LARSON
Keyword(s):  
New Species ◽  
South Pacific ◽  
Easter Island ◽  
The South ◽  
Southeastern Australia ◽  
Island Species ◽  
Posterior Nostril ◽  
The Pacific ◽  
Two New Species ◽  
Urogenital Papilla

Two new species of the genus Hetereleotris are described from the south Pacific. One species is known only from reefs off southeastern Australia and the second from Rapa and Pitcairn islands. Both species are close to a species recently described from Easter Island in the genus Pascua. The Easter Island species is redescribed herein. Previously only one species of the genus was reported from the Pacific. All of the species described here share a number of characteristics suggesting that they form a monophyletic group, including: the flattened and elongate urogenital papilla of the males, modified basicaudal scales, posterior nostril a simple pore or with only a slightly elevated margin anteriorly, two papillae just behind the mental frenum and the reduced transverse papilla pattern.

Correct scientific names for the least brook lamprey and the American brook lamprey (Petromyzontidae)

1982 ◽  
Vol 60 (5) ◽  
pp. 856-864 ◽  
Author(s):  
Vadim D. Vladykov ◽  
Edward Kott
Keyword(s):  
North America ◽  
Critical Study ◽  
Eastern North America ◽  
Taxonomic Character ◽  
Brook Lamprey ◽  
The Common ◽  
American Authors ◽  
Urogenital Papilla

Among students of lamprey taxonomy, there has been agreement on the common names for the least brook lamprey and American brook lamprey, two nonparasitic species of eastern North America. However, there still is a disagreement as to their scientific names. On the basis of a critical study of original descriptions and drawings of American authors of the last century, we reached the conclusion that the length of the urogenital papilla in spawning males is a very important taxonomic character. Therefore, we propose that the name for the least brook lamprey, which has a long urogenital papilla, is Lampetra lamottenii (Lesueur); and for the American brook lamprey, with a short papilla, is Lethenteron wilderi (Gage).

Three new species of seasonal killifishes of the Simpsonichthys antenori species group (Teleostei: Cyprinodontiformes: Rivulidae) from the rio São Francisco basin, Brazil

Zootaxa ◽  
2006 ◽  
Vol 1306 (1) ◽  
pp. 25 ◽  
Author(s):  
WILSON J.E.M. COSTA
Keyword(s):  
New Species ◽  
Color Pattern ◽  
Species Group ◽  
Slender Body ◽  
Central Portion ◽  
Black Stripe ◽  
Dorsal Fin ◽  
Identification Of Species ◽  
Three New Species ◽  
Urogenital Papilla

Three new species of the Simpsonichthys antenori group from the upper sections of eastern drainages of the middle rio São Francisco, serra do Espinhaço, are described. Simpsonichthys janaubensis, new species, from the rio Gorutuba floodplains, upper rio Verde Grande drainage, shares a derived color pattern of anal fin in males with S. flavicaudatus and S. flagellatus, but differs from them in having a more slender body, a shorter anal-fin base, and a distinctive color pattern of the dorsal fin in males. Simpsonichthys mediopapillatus, new species, from the rio São Domingos drainage, a part of the upper rio Verde Grande drainage, is similar to S. ghisolfii in having a long urogenital papilla and a light orangish-yellow subdistal stripe on the anal fin in males, and it is distinguished from all congeners in having a median neuromast on the posterior rostral series. Simpsonichthys macaubensis, new species, from the upper rio Paramirim drainage, differs from other species of the S. antenori group by a combination of features, including presence of contact organs on the flank in males, dorsal and anal-fin filaments reaching central portion of caudal fin in males, urogenital papilla short in males, and anal fin yellow, with a distal black stripe and iridescent dots over the entire fin in males. A key for identification of species of the S. antenori group is provided.

scholarly journals Morphology of the urogenital papilla and its component ducts in Astyanax altiparanae Garutti & Britski, 2000 (Characiformes: Characidae)

2015 ◽  
Vol 13 (2) ◽  
pp. 309-316 ◽  
Author(s):  
Diógenes Henrique de Siqueira-Silva ◽  
Amanda Pereira dos Santos Silva ◽  
Alexandre Ninhaus-Silveira ◽  
Rosicleire Veríssimo-Silveira
Keyword(s):  
Epithelial Cells ◽  
Environmental Changes ◽  
Striated Muscle ◽  
Muscle Fibers ◽  
Secretory Activity ◽  
Biological Indicator ◽  
Spermatic Duct ◽  
Striated Muscle Fibers ◽  
Urogenital Papilla ◽  
Globoid Cells

The histological description of the urogenital papilla is an important tool to comprehension of the reproductive mechanisms in fish, as well as a pre-requisite to germ cell transplantation in adult fish, besides to be a good biological indicator to environmental changes. Was performed the histological description of the urogenital papilla and its component ducts in the tetra Astyanax altiparanae. The genital and urinay ducts pass separately throughout most part of its extension, joining in a single duct before opening. In males this opening is asymmetric and seems to have double origin, being completely surrounded by striated muscle fibers, while in females it is symmetric and the muscle fibers does not surround it totally. Spermatic duct and oviduct undergo changes throughout their extension, mainly in the morphology of the surrounding epithelium. In the spermatic duct, squamous epithelial cells change to columnar and cuboid with possible secretory activity, close to testes. In the oviduct, anteriorly epithelial cells are also squamous, however, close to ovary there are lamellae composed by a pseudostratified epithelium with columnar and cuboid cells. The urinary duct is highly similar for both sexes presenting globoid cells, which description is known in mammals, however, rare in fish.

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