different between agnathan vs agnathic

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

English

Etymology

From Ancient Greek ?- (a-, “without”) + ?????? (gnáthos, “jaw”) +? -ic.

Pronunciation

• (US) IPA^(key): /æ??næ??k/

Adjective

agnathic (not comparable)

1. Jawless.
   • 1980, Thomas Pozorski, “The Early Horizon Site of Huaca de los Reyes: Societal Implications”, American Antiquity, volume 45, page 104:

     […] the heads are inverted and agnathic (lacking a lower jaw) […]

   • 2004, V. B. Rastogi, Modern Biology, seventh edition, Pitambar, ?ISBN, page II-61:

     Mouth is without jaws (agnathic) in lampreys and hagfishes and bounded by jaws (gnathic) in all other vertebrates.

   • 2004, David H. Dye, “Art, Ritual, and Chiefly Warfare in the Mississippian World”, Hero, Hawk, and Open Hand, Art Institute of Chicago, ?ISBN, page 201:

     Mortal combat and decapitation are suggested by the eight skillfully and gracefully engraved heads depicted here with their serrated necks, the prominent arrowheads, and the agnathic or jawless head regalia.

2. (pathology) Afflicted by or characteristic of agnathia.
   • 1902, Bertram C. A. Windle, “Twelfth Report on Recent Teratological Literature”, Journal of Anatomy and Physiology, volume 36, page 303:

     […]an imperforate pharynx which existed in an agnathic lamb.

   • 1913, John H. Musser, A Practical Treatise on Medical Diagnosis for Students and Physicians, sixth edition, Lea & Febiger, page 87:

     In the mouth: various irregularities, such as wide separation of the teeth; abnormal development of the canines; the prognathic or agnathic jaw; high arching of the palate; cleft palate—all are found more frequently among persons otherwise degenerate than in normal individuals.

   • 2006, Karen Gripp and Luis Fernando Escobar, “Facial Bones”, Human Malformations and Related Anomalies, second edition, Oxford University Press, ?ISBN, page 287:

     Most pregnancies with agnathic fetuses are associated with polyhydramnios, which probably result from fetal inability to swallow because of persistence of the oropharyngeal membrane.

Synonyms

• (jawless): agnathous, jawless
• (afflicted by agnathia): agnathous

Related terms

• agnath
• agnatha
• agnathan
• agnathia

Translations

Anagrams

• Ch'ang-t'ai, Changtai