Results 241 to 250 of about 20,818 (273)
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Sperm maturation in sturgeon (Actinopterygii, Acipenseriformes): A review
Theriogenology, 2017The morphology of the reproductive system of acipenseriform fishes is quite different from that of teleostean species, but an associated unique physiological difference in male sturgeons was not discovered until recently; sperm of sturgeons passes through the kidneys then via Wolffian ducts into the environment rather that emptying directly through ...
Sergii Boryshpolets +8 more
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III ACTINOPTERYGII, Strahl(en)flosser [PDF]
, 2014 Die Actinopterygii bilden den uberwiegenden Teil der rezenten Fischfauna, wahrend die Fischformen der Sarcopterygii (S. 288) heute nur noch mit wenigen Arten der Dipnoi (Lungenfische) (S. 290) und Actinistia (Hohlstachler) (S. 296) vertreten sind.
Wilfried Westheide, Gunde Rieger
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Retroposons of salmonoid fishes (Actinopterygii: Salmonoidei) and their evolution
Gene, 2009Short and long retroposons, or non-LTR retrotransposons (SINEs and LINEs, respectively) are two groups of interspersed repetitive elements amplifying in the genome via RNA and cDNA-mediated reverse transcription. In this process, SINEs entirely depend on the enzymatic machinery of autonomous LINEs.
Norihiro Okada, Vitaliy Matveev
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Primary structure of stanniocalcin in two basal Actinopterygii
General and Comparative Endocrinology, 2004The primary structure of stanniocalcin (STC), the principal product of the corpuscles of Stannius (CS) in ray-finned fishes, was deduced from STC cDNA clones for two species of holostean, the gar, Lepisosteus osseus and the bowfin, Amia calva. Overlapping partial cDNA clones were amplified by polymerase chain reaction (PCR) from single-strand cDNA of ...
Yutaka Amemiya, John H. Youson
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Osteichthyes: Immune Systems of Teleosts (Actinopterygii)
2018Teleosts and elasmobranchs are the lowest vertebrates that possess adaptive immunity akin to mammalian ones. However, the fish immune system is different from that of mammals, that is, a lack of bone marrow, lymph nodes and germinal center. Their immune system is also characterized by the fact that their surface is covered by live cells with mucus in ...
Teruyuki Nakanishi +2 more
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Discordant molecular and morphological evolution in buffalofishes (Actinopterygii: Catostomidae) [PDF]
Molecular Phylogenetics and Evolution, 2010 Buffalofishes (Genus Ictiobus) are large, robust-bodied suckers adapted to large rivers and lakes of North America. Currently recognized species are readily diagnosed by morphological characters, and the group is known from fossils dating back to the Miocene. However, sympatrically occurring species in the Mississippi River Basin are known to hybridize
Mark D. Clements +4 more
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Tapeta lucida in bony fishes (Actinopterygii): a survey [PDF]
Canadian Journal of Zoology, 1973 Bony fishes belonging to 75 families were examined for ocular tapeta lucida. The results are collated with published records, and tapeta are shown to occur in 28 families of teleostomes (Holostei and Teleostei) listed in Table 2. Except in the bigeyes Priacanthidae, they are diffuse reflectors located in the pigment epithelium.
J. A. C. Nicol +2 more
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Preliminary analysis of theinterrelationships of some paleozoic actinopterygii
Geobios, 1995Abstract A cladistic analysis of 20 actinopterygian species; including several new taxa from the Lower Carboniferous Bear Gulch Limestone of Montana; USA; is presented. This analysis is based upon 74 dermal cranial and shoulder girdle characteristics. The results strongly support several classical groupings such as that of Paleoniscimorpha.
Richard Lund +2 more
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ACTINOPTERYGII, Strahl(en) flosser
2010Die Actinopterygii bilden den uberwiegenden Teil der rezenten Fischfauna, wah rend die Fischformen der Sarcopterygii (S. 307) heute nur noch mit wenigen Arten der Dipnoi (Lungenfische) (S. 309) und Actinistia (Hohlstachler) (S. 315) vertreten sind. Der Name „Strahlflosser“ bezieht sich auf die strahlenformig angeordneten Lepidotrichia, die die Flossen ...
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Revision of the family Samaridae (Pleuronectiformes: Actinopterygii).
2001The family Samaridae has 28 nominal species or subspecies, 22 of which are recognized in this study. Four new species (Samariscus sp., Samaris sp., Samaris sp. 1 and S. sp. 2) are described, two species names resurrected (S. cacatuae and S. onatus) and two species (S. filipectoralis and S.
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