Daily Invader

Chesapeake Bay Kamptozoans

Kamptozoan (Barentsia benedeni)


Kamptozoan (Barentsia benedeni) is a tiny cup-shaped filter-feeder transported on the bottom of boats.


Barentsia benedeni is a Kamptozoan, tiny (8mm) filter feeders in the phylum Entoprocta, which means "anus inside". They look like tiny cups with a rim of feeding tentacles. They feed by collecting food with their tentacles and pulling it into the cup. Both the mouth and anus are located inside the cup. This species was first described in Belgium in 1887 and has since been found throughout European waters, from the Baltic to the Mediterranean, Black and Caspian Seas. It is also found on the coasts of Japan, Australia, and the Pacific coast of North America. Because it is small and so few people can identify it, its native range is not known. SERC made the first discovery of this species in Chesapeake Bay during a survey of the fouling community in 1994. This species was likely spread around the world on the bottom of ships’ hulls. Complete Record 


Kamptozoan (Loxosomatoides laevis)


Kamptozoan (Loxosomatoides laevis) are tiny filter-feeders from Asia.   

What the heck is a Kamptozoan? Kamptozoans are members of the phylum Entoprocta, which means "anus inside". This is a group of small (0.1 to 7mm, < inch) sessile (attached to a substrate) aquatic animals that use a crown of solid tentacles to filter feed. This species, Loxosomatoides laevis, is so small it can only be seen with a microscope (maximum size 0.98mm, 0.03in). It is the shape of a wineglass, with a thin stock and cup rimmed with feeding tentacles. Inside the cup are both the mouth and anus. This species was first described in India in 1915 and later in Japan (1951) and is considered native to those regions. SERC researchers discovered it in Chesapeake Bay in 1994 in both the upper and lower Bay. Because it is so small we don’t know when it arrived, but it wasn’t found in surveys done in the 1940s. Complete Record 


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