释义 |
ascidian
as·cid·i·an A0454100 (ə-sĭd′ē-ən)n. See sea squirt. [From New Latin Ascidia, genus name, from Greek askidion, diminutive of askos, wineskin.]ascidian (əˈsɪdɪən) n1. (Zoology) any minute marine invertebrate animal of the class Ascidiacea, such as the sea squirt, the adults of which are degenerate and sedentary: subphylum Tunicata (tunicates)2. (Zoology) ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cordadj (Zoology) of, relating to, or belonging to the Ascidiaceaas•cid•i•an (əˈsɪd i ən) n. 1. any tunicate of the class Ascidiacea, having in the larval stage a notochord, a characteristic of the embryonic vertebrate. adj. 2. belonging or pertaining to the class Ascidiacea. [1855–60; < New Latin Ascidi(um) a tunicate genus < Greek askídion a small bag + -an1] ThesaurusNoun | 1. | ascidian - minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leavestunicate, urochord, urochordate - primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larvaAscidiaceae, class Ascidiaceae - sometimes classified as an order: sea squirtssea squirt - ascidian that can contract its body and eject streams of water |
ascidian
ascidian: see ChordataChordata , phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals. ..... Click the link for more information. ; tunicatetunicate , marine animal of the phylum Chordata, which also includes the vertebrates. The adult form of most tunicates (also called urochordates) shows no resemblance to vertebrate animals, but such a resemblance is evident in the larva. ..... Click the link for more information. .ascidian
ascidian any PROTOCHORDATE of the class Ascidiacea (subphyllum Tunicata), such as the sea squirt, the adults of which are degenerate and sedentary. See also APPENDICULARIA.ascidian Related to ascidian: Urochordata, tunicate, ascidian tadpole, amphioxus, bryozoanWords related to ascidiannoun minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leavesRelated Words- tunicate
- urochord
- urochordate
- Ascidiaceae
- class Ascidiaceae
- sea squirt
|