Sessilogoga Grygier 1990

Genus Sessilogoga Grygier, 1990 Type species Sessilogoga elongata Grygier, 1990 Key to genera of the family Synagogidae and species of the genus Sessilogoga (based on morphology of females) 1 Carapace functionally bivalved, with long aperture, thorax without dorsal humps or horns, parasites of antipatharians or crinoids............................................................................................. 2 - Carapace functionally univalved, with restricted aperture (medium or short), thorax with dorsal humps or horns, mesoparasites of octocorals (unknown for Flatsia)....................................................................... 6 2 Epaulets on thoracomere 6 absent, frontal filament complex small, endoparasites of antipatharians.......... 3 (Sessilogoga) - Epaulets on thoracomere 6 present, frontal filament complex developed, ectoparasites of antipatharians or crinoids........ 5 3 Furcal rami length/height ratio 4.0–5.0............................................................. S. captiva - Furcal rami length/height ratio 6.0–9.0.................................................................... 4 4 Furcal rami length/height ratio 7.5–9.0, telsonic spines denticulate...................................... S. elongata - Furcal rami length/height ratio 6.0–6.5, telsonic spines smooth.......................................... S. perfuga 5 Ventral margin of carapace valves unflattened, without pair of big anterior pores, filamentary appendage of thoracopod 1 absent, ectoparasites of antipatharians.............................................................. Synagoga - Ventral margin of carapace valves flattened, with pair of big anterior pores, filamentary appendage of thoracopod 1 present, ectoparasites of crinoids......................................................................... Waginella 6 Carapace with special superficial grapnels and antero-ventral anchoring protrusion, parasites of octocorals of genus Chrysogorgia ......................................................................... Thalassomembracis - Carapace without special superficial grapnels and antero-ventral anchoring protrusion............................... 7 7 Thoracomeres with mid-dorsal dorsal humps, carapace aperture of medium length, host unknown................ Flatsia - Thoracomeres with long dorsal horns, carapace aperture small, parasites of octocorals of orders Malacalcyonacea and Scleralcyonacea...................................................................................... 8 8 Dorsal horns present on thoracomeres 1–3, but never on thoracomeres 4 or 5, parasites of octocorals of families Paramuriceidae, Eunicellidae and Primnoidae ................................................................ Gorgonolaureus - Dorsal horns present on thoracomeres 2–5, but never on thoracomere 1.......................................... 9 9 Females with uniramous penis, telsonic spines considerably shorter than furcal rami, parasites of octocorals of family Keratoisididae ................................................................................. Isidascus - Females with bifurcate penis, telsonic spines comparable in length to furcal rami, parasites of octocorals of family Chrysogorgiidae ............................................................................ Cardomanica