Nemathelminthes
Nem`a`thel`min´thes
prop. n. p | 1. | (Zool.) An order of helminths, including the Nematoidea and Gordiacea; the roundworms. |
单词 | nemathelminthes | |||
释义 | NemathelminthesNem`a`thel`min´thes
NemathelminthesNemathelminthes[‚nem·ə‚thel′min·thēz]Nemathelminthes(also Aschelminthes), a phylum of invertebrates including the classes Gastrotricha, Kinorhyncha, Rotatoria, Nematoda, Nematomorpha, Acanthocephala, and Priapulida. The unsegmented body is more or less completely covered with a cuticle. The sense organs include eyes, olfactory pits, and tactile organs. Between the dermomuscular tube and the gut there is a broad buccal cavity. The alimentary canal begins with a rudimentary mouth and ends in an anus. The excretory organs are protonephridia, or modified skin glands. There is no respiratory or circulatory system. The nerve system consists of a brain and nerve stems. The sexes are separate. Some zoologists treat the phylum as a subphylum of Scolecida. NemathelminthesNemathelminthes[nem″ah-thel-min´thēz]Nem·a·thel·min·thes(nem'ă-thel-min'thēz), |
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