different between gnathostome vs agnathan

English

Etymology

gnatho- +? -stome

Noun

gnathostome (plural gnathostomes)

1. (zoology) Any vertebrate with jaws, including amphibians, reptiles, mammals, and most modern fish, in contrast with the Agnatha
   • 2009 January 15, Martin D. Brazeau, “The braincase and jaws of a Devonian 'acanthodian' and modern gnathostome origins”, Nature Volume 457 No. 7227, doi:10.1038/nature07436:

     Current conceptions of gnathostome phylogeny depict a rather simplistic arrangement of nominally monophyletic and, apparently, morphologically disparate groups.

English

Etymology

From Agnatha, from Ancient Greek ?- (a-, “without”) + ?????? (gnáthos, “jaw”)

Pronunciation

• enPR: ?g?n?-th?n, IPA^(key): /?æ?.n???n/, /æ??næ.??n/

Adjective

agnathan (comparative more agnathan, superlative most agnathan)

1. (zoology) Belonging or pertaining to the superclass Agnatha, the jawless vertebrates.
   • 2005, Tim Haines and Paul Chambers, The Complete Guide to Prehistoric Life, BBC Books, page 20:

     Haikouichthys is one of three species of jawless (or agnathan) fish to be found in the Early Cambrian period.

Noun

agnathan (plural agnathans)

1. (zoology) A member of the superclass Agnatha of jawless vertebrates.
   • 1956, D. R. Newth, "On the Neural Crest of the Lamprey Embryo", Journal of Embryology and Experimental Morphology, volume 4, page 358:

     Thus should the cranial neural crest in cyclostomes prove to be non-skeletogenous this might be a reflection either of its own primitiveness or of the different evolutionary origins and morphological status of the visceral skeleton in agnathans and gnathostomes.

   • 1992, Peter J. Hanley et al., "Hagfish Humoral Defense Protein Exhibits Structural and Functional Homology with Mammalian Complement Components", Proceedings of the National Academy of Sciences, volume 89, page 7910:

     The hagfish is an agnathan, a modern representative of the earliest evolved group of vertebrates, the ostracoderms or jawless fishes, which arose prior to the ancient placoderms (3).

Synonyms

• agnath
• agnatha

Hypernyms

• vertebrate

Hyponyms

• cyclostome
• ostracoderm

Coordinate terms

• gnathostome

Translations