orthochoaniticadj.
/ˌɔːθəʊkəʊəˈnɪtɪk/, U.S. /ˈˌɔrθoʊˌkoʊəˈnɪdɪk/ Palaeontology. Now rare.
Having a straight, very short septal neck; (also) relating to or characteristic of the former suborder Orthochoanites of nautiloid cephalopods (see orthochoanite n.).
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [adjective] > belonging to order Tetrabranchiata > relating to the nautili > orthochoanitic
orthochoanitic1905
1905 Bull. N.Y. State Mus. No. 80. 339 Piloceras newtonwinchelli Clarke is by the structure of its ectosiphuncle not a holochoanitic form..but an orthochoanitic form.
1964 C. Teichert in R. C. Moore Treat. Invertebr. Paleont. K. 95/2 Kuhn..separated the straight, orthochoanitic nautiloids as a new ‘suborder’ termed Orthoceracea.
1982 Paleobiology 8 423/2 Forms with orthochoanitic septal necks may require a different tube thickness than those with cyrtochoanitic necks in order to produce the same tube strength.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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adj.1905