Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Links to other Web sites

(Pallas, 1766)


External appearance
Colonial, with zooids immersed. Colony forming flat circular or elongate sheets, up to 5 cm long and 2 cm broad. Colour of test variable but often blue. Zooids arranged in star-shaped systems of 3 to 12 individuals and colour in contrast with common test (B. schlosseri yellow).

Zooids up to 3 mm in length; body not divided into thorax and abdomen. Oral siphon unlobed; atrial siphon long and broad, tapering into a narrow tube. Up to 16 simple branchial tentacles of variable length. Branchial sac with 7 to 15 rows of straight stigmata; three longitudinal bars on each side; no folds. Gut left of branchial sac; stomach short with 8 to 9 longitudinal folds. Mulberry-like testes on each side in mantle; ovaries lateral to testes, with one to four ova (B. schlosseri zooid).

Attached to hard substrata; mainly in shallow water but occasionally to depths of several hundred metres;

From Norway to the Mediterranean.

Botryllus schlosseri