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.

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Taxonomy and distribution of Australian cephalochordates (Chordata: Cephalochordata).

Taxonomic composition and distribution of cephalochordates (Cephalochordata: Amphioxiformes) from Mexico

Our data also provides information on the relative importance of these three groups in comparison with other main macro-invertebrates from the Punta Morales flat collected during the 1984-1987 survey, like cephalochordates (Vargas & Dean, 2010), mollusks (Vargas-Zamora & Sibaja-Cordero, 2011), echinoderms (Vargas & Solano, 2011), crustaceans (Vargas-Zamora, Sibaja-Cordero, & Vargas-Castillo, 2012) and polychaetes (Vargas-Zamora, Sibaja-Cordero, Dean, & Solano-Ulate, 2015).

Braquiopodos, sipunculidos, enteropneustos y metales en dos planicies estuarinas de marea, Pacifico, Costa Rica

In muddy sediments the cephalochordate remains on the sediment surface.

On Branchiostoma californiense (Cephalochordata) from the Gulf of Nicoya estuary, Costa Rica

For the cephalochordates considered here, the exceptionally long separation of the parent taxa--since the latter part of the Mesozoic Era--raises interesting questions about how the divergent gene regulatory networks from the two parents function together and how the hybrid genotype directs the development of the hybrid phenotype.

Hybrids between the Florida amphioxus (Branchiostoma floridae) and the Bahamas lancelet (Asymmetron lucayanum): developmental morphology and chromosome counts

Although several hypotheses were postulated to explain the origin of protamines in vertebrates (see the following), there were no studies at that time on the SNBPs of other zoological groups with close affinity to the vertebrates, such as chordates or cephalochordates, to help understand the problem.

Sperm nuclear basic proteins of tunicates and the origin of protamines

Ascidians are members of the subphylum urochordates, which is a group of the phylum chordates along with cephalochordates and vertebrates (Satoh, 2003).

Ascidians as excellent models for studying cellular events in the chordate body plan

At present, the significance of these new findings is obscured by uncertainty about whether characters in the genus Asymmetron are more likely to be primitive or derived within the cephalochordates. It will, therefore, be important to resolve the main course of cephalochordate evolution by further phylogenetic analyses with nuclear genes and by sequencing the genome from a species of Asymmetron.

Laboratory spawning and development of the Bahama lancelet, Asymmetron lucayanum (Cephalochordata): fertilization through feeding larvae

Recent molecular phylogenetic studies have indicaed that cephalochordates diverged first from the chordate stem (Delsuc et al., 2006; Bourlat et al., 2006; Putnam et al., 2008), but it is believed that they retain ancestral characters more than the other chordate groups (Putnam et al., 2008).

Dynamic modification of oral innervation during metamorphosis in Branchiostoma belcheri, the oriental lancelet

1 A), and both phyla make up the sister group of the chordate phylum, which includes urochordates, cephalochordates, and vertebrates (Castresana et al., 1998; Bromham and Degnan, 1999; Cameron et al., 2000; Furlong and Holland, 2002; Smith et al., 2004; Bourlat et al., 2006).

cDNA sequences for transcription factors and signaling proteins of the hemichordate saccoglossus kowalevskii: efficacy of the expressed sequence tag (EST) approach for evolutionary and developmental studies of a new organism

In contrast to urochordates, cephalochordates have retained many features of the basal chordate body plan and are likely to approximate the ancestor of both urochordates and vertebrates.

Insights from a sea lamprey into the evolution of neural crest gene regulatory network