| 释义 |
Definition of nautiloid in English: nautiloidnoun ˈnɔːtɪlɔɪdˈnôdlˌoid Zoology A mollusc of a group of mainly extinct marine molluscs which includes the pearly nautilus. Subclass Nautiloidea, class Cephalopoda: Nautilus is the only surviving genus Example sentencesExamples - Most of the nautiloids exhibited broken shells; however, the rest of the mollusks were well preserved.
- They may represent a distinct lineage of early nautiloids, perhaps quite different anatomically to the contemporary and superficially similar oncocerids.
- These nautiloids are very similar in form and structure to the tarphycerids, among which they are now generally included as a suborder.
- Other fossil groups include diverse rugose corals, some tabulate corals, nautiloids, gastropods, and trilobites.
- Ammonoids reflected changing environmental conditions by changing their fecundity, whereas in nautiloids a strong heritable differential occurred between genotypes.
- Some nautiloids display embryonic shells that match the dimensions of the ammonoids.
- More than 500 specimens of embryonic shells of orthocerid nautiloids from the Imo Formation were investigated.
- Coiled shells, commonly of ammonoid cephalopods, nautiloids, or gastropods, have been given colloquial names such as rams' horns, snakestones, serpentstones, and conger eels.
- About this time the ammonoids began to take over from the nautiloids.
- Ammonoids are descendants of the extinct, primitive coiled nautiloids and they are extinct relatives of modern squid, octopus, cuttlefish, and nautilus.
Origin Mid 19th century: from the modern Latin genus name Nautilus (see nautilus). Definition of nautiloid in US English: nautiloidnounˈnôdlˌoid Zoology A mollusk of a group of mainly extinct marine mollusks which includes the pearly nautilus. Subclass Nautiloidea, class Cephalopoda: Nautilus is the only surviving genus Example sentencesExamples - Most of the nautiloids exhibited broken shells; however, the rest of the mollusks were well preserved.
- About this time the ammonoids began to take over from the nautiloids.
- Other fossil groups include diverse rugose corals, some tabulate corals, nautiloids, gastropods, and trilobites.
- Ammonoids reflected changing environmental conditions by changing their fecundity, whereas in nautiloids a strong heritable differential occurred between genotypes.
- They may represent a distinct lineage of early nautiloids, perhaps quite different anatomically to the contemporary and superficially similar oncocerids.
- Some nautiloids display embryonic shells that match the dimensions of the ammonoids.
- More than 500 specimens of embryonic shells of orthocerid nautiloids from the Imo Formation were investigated.
- These nautiloids are very similar in form and structure to the tarphycerids, among which they are now generally included as a suborder.
- Coiled shells, commonly of ammonoid cephalopods, nautiloids, or gastropods, have been given colloquial names such as rams' horns, snakestones, serpentstones, and conger eels.
- Ammonoids are descendants of the extinct, primitive coiled nautiloids and they are extinct relatives of modern squid, octopus, cuttlefish, and nautilus.
Origin Mid 19th century: from the modern Latin genus name Nautilus (see nautilus). |