| 释义 |
Mollusca, n. pl. Zool.|məˈlʌskə|
[mod.L. mollusca (Jonston 1650), neut. pl. of L. molluscus (occurring in mollusca nux, a soft kind of nut), also ellipt. as n., and molluscum neut., used subst. as the name of a kind of fungus.]
a. Applied by Linnæus in 1758 to a heterogeneous group of invertebrates, forming the second order of his class Vermes, and comprising the Echinoderms, Hydroids, Annelids, and naked Mollusca. To these the shell-bearing Mollusca were added by later naturalists.
b. In present use (mainly following the classification proposed by Cuvier in 1788–1800), a phylum or sub-kingdom of animals, comprising the four classes Gastropoda (limpets, snails, etc.), Scaphopoda (tooth-shells), Cephalopoda (cuttlefish, etc.), and Lamellibranchia (oyster, mussel, etc.); the classes Cirrhopoda, Tunicata, and Brachiopoda, included by Cuvier among the Mollusca, are now placed elsewhere, and the Polyzoa have since Cuvier's time been added to the phylum and again removed.
1797Encycl. Brit. (ed. 3) XII. 204/1 Mollusca, in the Linnæan system, is the denomination of the second genus of vermes or worms. These are simple naked animals, not included in a shell, but furnished with limbs. 1806W. Turton tr. Linn. Syst. Nat. IV. 3 Class VI. Worms... They are divided into five Orders. I. Intestina... II. Mollusca. Are naked, furnished with tentacula or arms, for the most part inhabitants of the sea; and [etc.]. 1828Fleming Brit. Anim. 224 It is my intention to proceed to the consideration of the species [of Radiata]..immediately after the enumeration of the Mollusca. 1896Kirkaldy & Pollard tr. Boas' Text-bk. Zool. 289 note, In many Mollusca..certain parts of the epithelial covering of the pericardium are glandular. |