Cephalochordata


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Related to Cephalochordata: Urochordata

Cephalochordata

a primitive group of the phylum Chordata that is usually given the status of a class. The group contains only AMPHIOXUS and a few related forms.
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armillaris NR NR X Adult Trypanosyllis NR NR X Adult parvidentata Family Terebellidae NR X X Larva Family Trichobranchidae NR X X Larva Phylum Chordata Subphylum Cephalochordata NR X NR Family Branchiostomidae NR X NR Branchiostoma sp.
Este phylum comprende tres subphylum: Urochordata (ascidias, salpas, barrilitos de mar y apendicularias), Cephalochordata (anfioxos o lancetas de mar) y Vertebrata (e.g., Myxini, Cephalaspido morphii, Chondrichthyes, Actinopterygii, Sarcopterygii) (Kirkaldy, 1895; Parker & Haswell, 1987; Nelson, 2006).
A homologous amino acid sequence alignment of the various CacyBP proteins from Arthropoda, Enteropneusta, Mollusca, Cephalochordata, and Vertebrata was performed using ClustalX.
Conversely, molecular cloning of [CB.sub.1]/[CB.sub.2] receptor orthologs has produced positive results only in urochordates (the sea squirt, Ciona intestinalis), in cephalochordata (the amphioxus, Branchiostoma floridae), in nonmammalian vertebrates (fish, amphibians, reptiles, and birds), and in mammals, with duplication of [CB.sub.1] or [CB.sub.2] genes found in fish [49-51].
The Phylum Chordata comprises three Subphyla: Urochordata, Cephalochordata, and Vertebrata.
Both am-mocoete larvae of lampreys and the non-vertebrate chordate lancelets (Cephalochordata) rest on one side of the body.
CEPHALOCHORDATA Branchiostoma elongatum PISCES Engraulis ringens Odonthestes regia Normanichthys crockeri 57.29 Osteichthyes indet.