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Group of vertebrates consisting of amphibians and fish
The anamniotes are an informal group of vertebrates comprising all fish and amphibians, which lay their eggs in aquatic environments. They are distinguished
Anamniotes
Structure of the brain in vertebrates
inhibitory neurons. This structure is very similar to that found generally in anamniotes, though cartilaginous fishes do show a layered arrangement of their pallial
Pallium_(neuroanatomy)
Innermost membranous sac that surrounds and protects a developing embryo
birds, and mammals. Amphibians and fish lack the amnion and thus are anamniotes (non-amniotes). The amnion stems from the extra-embryonic somatic mesoderm
Amnion
Clade of the first four-limbed vertebrates and their descendants
Threatened species in Red List Best estimate of percent of threatened species Anamniotes lay eggs in water Amphibians 8,707 8,020 92% 2,876 41% Amniotes adapted
Tetrapod
Clade of tetrapods
in marsupial and placental mammals). This distinguishes amniotes from anamniotes (fish and amphibians) that have to spawn in aquatic environments. Most
Amniote
Embryonic structure
transition from aquatic to terrestrial environments. Fish and amphibians are anamniotes, lacking the allantois. This sac-like structure, whose name is Greek for
Allantois
Biological process
Inner ear regeneration is the biological process by which the hair cells and supporting cells (i.e. Hensen's cells and Deiters cells) of the ear proliferate
Inner_ear_regeneration
Subphylum of chordates
groups Image Class Estimated number of described species Group totals Anamniote lack amniotic membrane so need to reproduce in water Jawless "Fish" Myxini
Vertebrate
Taxonomic clade
informally into mammals, sauroids, and ichthyoids (the latter containing the anamniotes), based on the gaps in physiological traits and lack of transitional fossils
Sauropsida
Organic vessel in which an embryo first begins to develop
mother also providing direct nourishment. The eggs of fish and amphibians (anamniotes) are jellylike. Cartilaginous fish (sharks, skates, rays, chimaeras) eggs
Egg
Paired internal organ in vertebrates
Sometimes the anamniote mesonephros is called opistonephros to distinguish it from the stage of development in amniotes. In anamniotes, opisthonephros
Kidney_(vertebrates)
Nerves that emerge directly from the brain
(non-amphibian tetrapods) have cranial nerves similar to those of humans. In anamniotes (fishes and amphibians), the accessory nerve (XI) and hypoglossal nerve
Cranial_nerves
Largest structure in the nucleus of eukaryotic cells
that it evolved from a bipartite organization with the transition from anamniotes to amniotes. Reflecting the substantial increase in the DNA intergenic
Nucleolus
accounts call opisthonephros the ‘mesonephros’, but the opisthonephros in anamniotes (lampreys, fish, and amphibians) differ considerably than the mesonephros
Opisthonephros
Extinct family of tetrapods
amniotes, would have been well adapted land animals, but still dependent on anamniote eggs, and possibly having a tadpole stage. Contrary to the more advanced
Limnoscelidae
Order of viruses
Malacoherpesviridae infect molluscs (abalone and oysters), the Alloherpesviridae infect anamniotes (frogs and fish), and the Herpesviridae infect amniotes (reptiles, birds
Herpesvirales
Fertilization of an egg by more than one sperm
ctenophora, reptiles and amphibians. Some vertebrates that are both amniote or anamniote, including urodele amphibians, cartilaginous fish, birds and reptiles
Polyspermy
Auditory sensory receptor nerve cells
hair cells, which have a mechanotransduction function and are found in anamniotes, have been shown to regrow in species such as the zebrafish. Researchers
Hair_cell
All Latin and Greek roots beginning with G
ἀμνίον (amníon) amniocentesis, amnion, amnioscope, amniote, amniotic, anamniote amph-, amphi- both, on both sides of, both kinds Greek ἀμφί (amphí) "on
List of Greek and Latin roots in English/A–G
List_of_Greek_and_Latin_roots_in_English/A–G
All Latin and Greek roots beginning with A
ἀμνίον (amníon) amniocentesis, amnion, amnioscope, amniote, amniotic, anamniote amph-, amphi- both, on both sides of, both kinds Greek ἀμφί (amphí) "on
List of Greek and Latin roots in English/A
List_of_Greek_and_Latin_roots_in_English/A
Extinct clade of tetrapods
the divide. This would indicate the large and bulky diadectomorphs laid anamniote eggs (in water). However, no unambiguously diadectomorph tadpole is known
Diadectomorpha
presumptive mesoderm. Basal chordates rely predominantly on invagination, anamniote vertebrates and reptiles on a varying combination of involution and ingression
Ingression_(biology)
Layer of cells in mammalian embryos
urogenital system, named pronephros, mesonephros and metanephros respectively (anamniote embryos form only a pronephros and mesonephros). The intermediate mesoderm
Intermediate_mesoderm
Chronological listing
wardlawi. Golubev and Bulanov published article about description of anamniote tetrapod fossils from the Late Permian Sundyr Tetrapod Assemblage (Mari
Timeline_of_Permian_research
(2021), who interpret Hylopus hardingi as tracks probably produced by anamniote reptiliomorphs. Footprints of early reptiles, including footprints representing
2021_in_reptile_paleontology
Extinct clade of synapsids
more derived synapsids. The diadectomorphs, conventionally regarded as anamniote tetrapods, may prove to be synapsids even more basal than Caseasauria
Caseasauria
Embryonic structure
may indicate that the floor plate induction mechanism in amniotes and anamniotes differs. To reconcile these differences, a dual-mode induction model has
Floor_plate_(biology)
Paraphyletic group of tetrapodomorphs
The amniote egg would necessarily have had to evolve from one with an anamniote structure, as those found in fish and modern amphibians. In order for
Labyrinthodontia
Geologic formation of Permian age in the southwestern United States
regarded as valid, from the Coconino Sandstone are cf. Amphisauropus isp. (anamniotes), cf. Dromopus isp. (reptile), Erpetopus isp. (reptile), Ichniotherium
Coconino_Sandstone
Geologic formation in the Grand Canyon
fossils is an abundant and relatively diverse collection of reptile and anamniote tracks and rarer synapsid tracks. In 1929, David White published a monograph
Hermit_Formation
amphibian species, is published by Tietje & Rödel (2018). Description of anamniote tetrapod fossils from the Late Permian Sundyr Tetrapod Assemblage (Mari
2018 in amphibian paleontology
2018_in_amphibian_paleontology
ANAMNIOTES
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Boy/Male
Hindu
One of the kauravas
Boy/Male
Hindu, Indian
Sky
Male
Hungarian
Hungarian form of English Philip, FÜLÖP means "lover of horses."
Girl/Female
British, English
Goddess of the Deep
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Hebrew American English French
Grace.
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Muslim/Islamic
Distinct
Boy/Male
Hindu
Initiated, Consecrated
Girl/Female
Muslim
The nightingale.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Telugu
A Honeybee
Girl/Female
Indian, Punjabi, Sikh
A Prudence
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