Cephalochordata

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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.
References in periodicals archive ?
Ancient phylogenetic separation between Pacific and Atlantic cephalochordates as revealed by mitochondrial genome analysis.
The cephalochordates are represented by the lancelets (also known as amphioxus in old literature), with about 29 valid species in two genera: Branchiostoma and Epigonychthys (Poss & Boschung 1996).
In addition, cephalochordate larvae have several quantifiable phenotypic characters (like size of the preoral ciliated pit and angle of deflection of the larval gill slits and anus from the ventral midline).
The production of concentric fertilization envelopes has not been reported for any other cephalochordate, or indeed for any kind of animal.
Recent genomic comparison has provided evidence that urochordates, not cephalochordates, represent the closest living relatives of vertebrates (Delsuc et al, 2006), although this has been contended (Bourlat et al.
Tunicates and not cephalochordates are the closest living relatives of vertebrates.
Other publications followed focusing on the abundances of the main taxonomic groups, like cephalochordates (Vargas & Dean, 2010), echinoderms (Vargas & Solano, 2011), mollusks (Vargas-Zamora & Sibaja-Cordero, 2011), crustaceans (Vargas-Zamora, Sibaja-Cordero, & Vargas-Castillo, 2012), and polychaetes (Vargas-Zamora, Sibaja-Cordero, Dean, & Solano-Ulate, 2015).
2006) Tunicates and not cephalochordates are the closest living relatives of vertebrates.
deals with fish and fishlike organisms starting with cephalochordates, hagfishes, lampreys, cartilaginous fishes (including spookfishes) and "all the known teleosts" that occur in south Australian waters.
56) Another group of primitive chordates are the cephalochordates (represented today by the lancelets) that possess a notochord as adults, pharyngeal slits, and muscles arranged in parallel bundles.