释义 |
Cephalochordata /ˌsɛfələ(ʊ)kɔːˈdeɪtə / /ˌkɛfələ(ʊ)kɔːˈdeɪtə/plural noun ZoologyA small group of marine invertebrates that comprises the lancelets.- Subphylum Cephalochordata, phylum Chordata.
For this reason, the three subphyla, Urochordata, Cephalochordata, and Vertebrata, will be treated separately....- Although this classification is widely accepted, some authors recognize three chordate phyla: Urochordata for the urochordates, Cephalochordata for the lancelets, and Vertebrata for the vertebrates.
- Deuterostomia are a major group of metazoans composed of three phyla: Chordata (including three subphyla: Vertebrata, Cephalochordata, and Urochordata), Hemichordata, and Echinodermata.
Derivatives cephalochordate /ˌsɛfələ(ʊ)ˈkɔːdeɪt/ /ˌkɛfələ(ʊ)ˈkɔːdeɪt/ noun & adjective ...- Five major groups are usually recognized within Deuterostomia at the level of phylum: hemichordates, echinoderms, cephalochordates, urochordates, and vertebrates.
- Comparative developmental studies of chordates have demonstrated that these regulatory genes are expressed in a conserved manner across the spectrum of body plans displayed by urochordates, cephalochordates and vertebrates.
- Also, unlike the vertebrate and cephalochordate genes, the ascidian homologues are not detected in mesodermal tissues.
Origin Modern Latin (plural), from cephalo- 'head' + Greek chorda 'cord'. |