agnath

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

• enPR: ăgʹnəth, IPA^(key): /ˈæɡ.nəθ/

agnath (plural agnaths)

1. (zoology) An agnathan.
   • 1979, Stephen C. Wood, Evolution of Respiratory Processes, Marcel Dekker, →ISBN, page 218:

     Evolution of vertebrates was accompanied by a gradual increase in oxygen availability, from the irrespirable atmosphere of the Precambrian to a PO₂ at 7 mmHg with the first vertebrates (agnaths), to the present sea level PO₂ value of 160 mmHg with the first reptiles.

   • 1996, George Christopher Williams, Adaptation and Natural Selection, Princeton University Press, →ISBN, page 51:

     The gnathostomes almost entirely replaced the agnaths, presumably because they were more effective fishes.

   • 2002, Harold J. Morowitz, The Emergence of Everything, Oxford University Press, →ISBN, page 113:

     Thus, although tunicates are presumably intermediate between flatworms and agnaths, the larval tunicate more closely resembles the flatworm and adult agnath.

• ghanta

Ancient Greek ἀ- (a-, “without”) + γνάθος (gnáthos, “jaw”)

agnath (not comparable)

1. (zoology) jawless
   • 1895, H. Henking, “Ueber die Ernährung von Glandina algira L.”, Zoologische Jahrbücher, volume 8, page 87:

     Da die Testacelliden agnath sind, so vermögen sie sich ihrer Beute nur mit Hülfe der Radula zu bemächtigen, indem diese etwas vorgestülpt wird, um ein Eingreifen der Radula-Zähne zu ermöglichen.

   • 1906, “Pisces für 1902”, Archiv für Naturgeschichte, volume 2, issue 1, page 15

     Erörterung der Frage, ob die Ostracodermen agnath oder gnathostom sind.

   • 2004, Rüdiger Wehner and Walter Gehring, Zoologie, twenty-fourth edition, Thieme, →ISBN, page 809:

     Hypothetisches Ausgangsstadium (agnathes Wirbeltier) mit gleichförmigen Branchialbögen (Kieferbögen).

• kieferlos