Results 11 to 20 of about 5,469 (161)
Eimeria lepidosirenis n.sp. (Apicomplexa:Eimeriidae) of the South American lungfish Lepidosiren paradoxa (Osteichthyes:Dipnoi) from Amazonian Brazil [PDF]
Memorias do Instituto Oswaldo Cruz, 2006 The mature oocysts of Eimeria lepidosirenis n.sp. are described in faeces removed from the lower region of the intestine of a single specimen of the South American lungfish Lepidosiren paradoxa, from Belém, state of Pará, Amazonian Brazil.
R Lainson, Lucia Ribeiro
doaj +6 more sources
von Willebrand factor D and EGF domains is an evolutionarily conserved and required feature of blastemas capable of multitissue appendage regeneration. [PDF]
Evol Dev, 2020 Identification of a gene, von Willebrand Factor D and EGF Repeats (vwde), whose expression is highly enriched in axolotl limb blastemas prompted comparative experimentation in lungfish, Polypterus, and Xenopus. Vwde expression is induced in key tissues during regeneration in all four models (fins in lungfish and polypterus; tail in Xenopus embryos ...
Leigh ND +11 more
europepmc +2 more sources
The conundrum of pharyngeal teeth origin: the role of germ layers, pouches, and gill slits. [PDF]
Biol Rev Camb Philos Soc, 2022 ABSTRACT There are several competing hypotheses on tooth origins, with discussions eventually settling in favour of an ‘outside‐in’ scenario, in which internal odontodes (teeth) derived from external odontodes (skin denticles) in jawless vertebrates. The evolution of oral teeth from skin denticles can be intuitively understood from their location at ...
Huysseune A, Cerny R, Witten PE.
europepmc +2 more sources
Bony fish genomes: Status and gaps. [PDF]
J Fish BiolAbstract Bony fish constitute an exceptionally species‐rich group of aquatic vertebrates, comprising more than 95% of all living fish. The adaptive processes on the diversity of environments they inhabit make them a highly diverse group from taxonomic, morphological and evolutionary standpoints.
Pérez-Pereira N +3 more
europepmc +2 more sources
Using the swimbladder as a respiratory organ and/or a buoyancy structure—Benefits and consequences
Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Volume 335, Issue 9-10, Page 831-842, November 1, 2021., 2021 Graphical abstract Abstract A swimbladder is a special organ present in several orders of Actinopterygians. As a gas‐filled cavity it contributes to a reduction in overall density, but on descend from the water surface its contribution as a buoyancy device is very limited because the swimbladder is compressed by increasing hydrostatic pressure.
Bernd Pelster
wiley +1 more source
Brazilian Journal of Veterinary Pathology, 2020 The present study reports a case of leucism in South American Lungfish Lepidosiren paradoxa captured in Corrientes, Argentina. It was observed a change in cutaneous pigmentation, and it was concluded that it was leucism and not albinism, since there was ...
Luis A. Romano, Virgínia F. Pedrosa
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Phylogeny and evolutionary history of the amniote egg
Journal of Morphology, Volume 282, Issue 7, Page 1080-1122, July 2021., 2021 We review morphological features of the amniote egg and embryos in a large comparative phylogenetic framework, including all major clades of extant vertebrates. We discuss 40 characters that are relevant for an analysis of the evolutionary history of the vertebrate egg. Special attention is given to the morphology of the cellular yolk sac, the eggshell,
J. Matthias Starck +2 more
wiley +1 more source
Fish and Fisheries, Volume 22, Issue 2, Page 324-355, March 2021., 2021 Abstract Hyperoxia occurs when water oxygen (O2) levels exceed normal atmospheric pressure (i.e., >100% air saturation). Fish can experience hyperoxia in shallow environments due to photosynthesis or in aquaculture through O2 supplementation. This review provides a comprehensive synthesis of the effects of hyperoxia on fish, spanning influences on ...
Tristan J. McArley +2 more
wiley +1 more source
LEPIDOSIREN PARADOXA Johannes Müller Library (-) Lepidosiren paradoxa (-
Bischoff, Theodor Ludwig Wilhelm
core +5 more sources