Costa, who named the genus Branchiostoma, and it has since been dealt with by many writers.
Branchiostoma Costa, having paired sexual organs (gonadic pouches); 2.
- Amphioxus lanceolatus, Yarrell (Branchiostoma lubricum, Coste).
The Peruvian species, Branchiostoma elongatum, with nearly eighty myotomes, cannot at present be assigned to its proper subgenus.
In the genus Branchiostoma the metapleural folds terminate symmetrically shortly behind the atriopore, but in Heteropleuron the right metapleur passes uninterruptedly into the median crest of the ventral fin (fig.
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