Branchiostoma is one of the few living genera of lancelets (order Amphioxiformes). It is the type genus of family Branchiostomatidae.

Anatomical diagram of B. lanceolatum (click for description)

These small vaguely eel- or snake-like animals are close relatives of vertebrates. The scientific name means "gill-mouth", referring to their anatomy – unlike vertebrates, they do not have a true head (with a skull capsule, eyes, nose, a well-developed brain etc.), but merely a mouth adjacent to the gill-slits, with the slightly enlarged anterior end of the dorsal nerve cord above and in front of them. It dislikes the light.

Branchiostoma grows to lengths of 50 to 60 millimeters in length.

Like all lancelets, they are filter feeders that hide in the sediment most of the time. The genus inhabits coastal waters throughout the world.

Species

References

  1. ^ "Report of the United States Commissioner of Fisheries for the fiscal year 1928 with appendixes — Part II" (PDF). 1928. Retrieved 18 August 2017.
  2. ^ "UNESCO-IOC Register of Marine Organisms (URMO) - Branchiostoma mortonense Kelly, 1966".
  3. ^ "WoRMS - World Register of Marine Species - Branchiostoma mortonense Kelly, 1966".

External links