Tanystylum orbiculare Wilson, 1878
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Family:  Ammotheidae ()
Max. size: 
Environment:  benthic; marine; depth range 5 - 200 m
Distribution:  Indo-West Pacific, Southwest Atlantic, North Atlantic, and the Mediterranean: Africa and West Atlantic.
Diagnosis:  Ocular tubercle low, with tiny apical cone. Proboscis ovoid, with distal constriction around mouth. Abdomen ovoid, extending almost to distal rim of first coxae of fourth leg pair, with 4 to 6 short distal setae. Chelifores with single short segment, about twice as long as wide, each with 3 distal setae; chelae absent. Palps 5 segmented (sometimes 6), extending slightly beyond proboscis; third segment longest. Ovigers 10-segmented, smaller in female; seventh segment of male without typical apophysis ("elbow") but with 3 or 4 long spines; terminal segment tiny, with 2 long, simple spines. Legs robust, with typical setose dorsal swellings; propodus large, with dorsal and lateral setae, 3 large heel spines, and auxiliary claws more than half length of robust main claw (Ref. 2115, p. 35).
Biology:  Minimum depth from Ref. 116112. Epibiotic (Ref. 116112). Common inhabitant of Sargassum (Ref. 2115, page 35). Feeds on a demosponge (Ref. 121217).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans: 
Country info:   
 

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