Krohn, 1852
Description
— Gonozooid small, with an upright, U-shaped intestine. The gill slits are not extensive, dorsally and ventrally attached at M5 and only slightly curved backwards reaching M6 or a little bit beyond. The spherical testis lies in a ventral pocket that slightly extrudes the body between M5 and M6. The frontal end of the endostyle is between M2 and M3; the caudal end is just in front of M5. The dorsal nerve ganglion is located between M3 and M4.
Size
Length ca. 4 mm.
Depth range
Distribution in the North Sea
Rare in the Norther North Sea, as a visitor from warm waters.
World distribution
Northern, Central and temperate SE Atlantic Ocean, tropical and temperate SW Indian Ocean, E Central Pacific, Mediterranean Sea.