prosiphonateadj.

Brit.

/prəʊˈsʌɪfn̩eɪt/,

/prəʊˈsʌɪfn̩ət/, U.S.

/proʊˈsaɪfənət/

Origin: Formed within English, by derivation. Etymons: pro- prefix², siphonate adj.

Etymology: < pro- prefix² + siphonate adj. Compare earlier prosiphon n.

Palaeontology.

Of a chambered shell: having the septal necks of the siphuncle directed forward, as in some ammonoids.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [adjective] > having siphonal funnel forward (of shell)

prosiphonate1935

1935 W. H. Twenhofel & R. R. Shrock Invertebr. Paleontol. ix. 378 Prosiphonate ones [sc. septa] are found in Mesozoic forms [of cephalopod].

1952 R. C. Moore et al. Invertebr. Fossils ix. 371/1 In late Paleozoic and Mesozoic ammonoids, this structure [sc. the siphuncle] is mostly confined to immature stages, and forward-pointing septal necks appear in submature whorls. This condition is described as prosiphonate.

1986 G. Culverwell tr. P. Arduini & G. Teruzzi Macdonald Encycl. Fossils No. 91 The siphuncle is ventral with prosiphonate septal necks.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	prosiphonate
释义	prosiphonateadj. Brit. /prəʊˈsʌɪfn̩eɪt/, /prəʊˈsʌɪfn̩ət/, U.S. /proʊˈsaɪfənət/ Origin: Formed within English, by derivation. Etymons: pro- prefix², siphonate adj. Etymology: < pro- prefix² + siphonate adj. Compare earlier prosiphon n. Palaeontology. Of a chambered shell: having the septal necks of the siphuncle directed forward, as in some ammonoids. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [adjective] > having siphonal funnel forward (of shell) prosiphonate1935 1935 W. H. Twenhofel & R. R. Shrock Invertebr. Paleontol. ix. 378 Prosiphonate ones [sc. septa] are found in Mesozoic forms [of cephalopod]. 1952 R. C. Moore et al. Invertebr. Fossils ix. 371/1 In late Paleozoic and Mesozoic ammonoids, this structure [sc. the siphuncle] is mostly confined to immature stages, and forward-pointing septal necks appear in submature whorls. This condition is described as prosiphonate. 1986 G. Culverwell tr. P. Arduini & G. Teruzzi Macdonald Encycl. Fossils No. 91 The siphuncle is ventral with prosiphonate septal necks. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < adj.1935
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