Results 191 to 200 of about 839,133 (225)
Some of the next articles are maybe not open access.

Tapeta lucida in bony fishes (Actinopterygii): a survey [PDF]

open access: possibleCanadian 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
openaire   +1 more source

Retroposons of salmonoid fishes (Actinopterygii: Salmonoidei) and their evolution

Gene, 2009
Short 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
openaire   +3 more sources

Characteristics of the reparative regeneration of fins in the polypterid fish (Polypteridae, Actinopterygii)

Russian Journal of Developmental Biology, 2012
Epimorphic regeneration of fins was studied in different ray-finned fishes (Actinopterygii), but species representing the phylogenetically basal lineages of the taxon have remained outside the attention of researchers. Information on the regenerative abilities of these groups is important both for understanding the evolutionary origins of the ...
A. I. Nikiforova, V. A. Golichenkov
openaire   +3 more sources

Palaeobiogeography of Cretaceous bony fishes (Actinistia, Dipnoi and Actinopterygii) [PDF]

open access: possibleGeological Society, London, Special Publications, 2008
Abstract Dispersal and vicariant patterns have been used as opposite concepts to explain biogeographical histories of organisms. Vicariance has been preferred to dispersal: the former is said to be falsifiable while the latter is regarded as a contingent hypothesis.
openaire   +1 more source

The Genus Polypterus (Bichirs): A Fish Group Diverged at the Stem of Ray-Finned Fishes (Actinopterygii)

Cold Spring Harbor Protocols, 2009
INTRODUCTIONAxis and germ-layer formations are central issues in vertebrate embryology that can be examined in the zebrafish, Xenopus, chick, and mouse. An intriguing question is how the mechanisms that existed in an ancestral vertebrate have been modified during vertebrate evolution.
Masaki Takeuchi   +2 more
openaire   +3 more sources

Isozymes of glucosephosphate isomerase (PGI) in fishes of the subclass actinopterygii

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1986
A compilation of the species of fishes of the subclass Actinopterygii for the study of the PGI isozyme system is given. PGI appears to be codified by more than one locus in fishes; 65% of the species analysed here have two loci for PGI. PGI duplication in fishes and the relationship of isozymes of PGI with temperature and metabolism are discussed.
openaire   +3 more sources

A new deep-bodied fossil fish (Actinopterygii) from the Rio do Rasto Formation, Paraná Basin, Brazil

, 2012
Fossil fishes from the Parana Basin are represented by actinopterygians, chondrichthyans, coelacanths and dipnoans. This diverseichthyofauna comprises mainly fragmentary material with few complete specimens.
E. V. Dias
semanticscholar   +1 more source

An offshore fish assemblage (Elasmobranchii, Actinopterygii) from the Late Jurassic of NE Spain

Paläontologische Zeitschrift, 2012
Bulk sampling of late Oxfordian and early Kimmeridgian sediments of the Sot de Chera Formation near the Village of Moneva in the Aragonese Branch of the Iberian Ranges (NE Spain) yielded a low-diversity fauna of sharks (Synechodus ungeri, Phorcynis sp. cf. P.
Klug, Stefanie, Kriwet, Jurgen
openaire   +5 more sources

Fish Abundance and Mesozooplankton Resource: a study on Sprattus sprattus (Linnaeus, 1758) (Actinopterygii: Clupeidae) in the Romanian Black Sea Waters

Acta zoologica Bulgarica
Food availability influence the state of fish stocks, with effects on the demographics, composition and productivity of fish populations. In the spring seasons of 2018–2020, expeditions were carried out in order to collect data for Sprattus sprattus ...
E. Bișinicu   +5 more
semanticscholar   +1 more source

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