| 释义 |
holochoanite Palæont.|ˌhɒləʊˈkəʊənaɪt|
Also Holo-.
[f. mod.L. Holochoanites, altered form of Holochoanoida (see next): see -ite1 2 a.]
A nautiloid cephalopod in which the septal necks extend from the septum in which they originate as far as the next septum towards the apex; also, a member of the obsolete sub-order Holochoanites, of which such necks were characteristic.
1898A. Hyatt in Proc. Amer. Assoc. Advancem. Sci. XLVII. 364 The suborders..are as follows: I. Holochoanites with the funnels of the siphuncle reaching entirely across each air chamber completely shutting off the interior of each chamber from the interior of the siphuncle. 1929Bull. Geol. Soc. China VIII. 119 Stages in development of the primitive Holochoanite. 1944E. O. Ulrich et al. Ozarkian & Canadian Cephalopods III. 28 Most of the Early Paleozoic holochoanites that have long straight conchs can be referred to the Endoceratidae, but a few..are being placed in the Suecoceratidae. 1952R. C. Moore et al. Invertebr. Fossils ix. 342/1 Thin-section studies indicate that the elongate septal necks which are supposed to distinguish the Holochoanites occur only in a minority of them.
Hence ˌholochoaˈnitic a., (having septal necks) characteristic of a holochoanite; (by some writers used to include macrochoanitic a.).
1905Bull. N.Y. State Mus. lxxx. 339 Piloceras newtonwinchelli Clarke is by the structure of its ectosiphuncle not a holochoanitic form..but an orthochoanitic form. 1950Jrnl. Paleontol. XXIV. 604/1 Only a small part of Hyatt's Holochoanites is actually holochoanitic. 1964C. Teichert in R. C. Moore Treat. Invertebr. Paleont. K. 164/2 Endoceratidae with holochoanitic, and even macrochoanitic, septal necks and complete endocone systems also appeared in the late Early Ordovician. |