PORROCYSTIDINAE Evdonin, 1977

Faubel, A. & Warwick, R. M., 2005, The marine flora and fauna of the Isles of Scilly: Free-living Plathelminthes (‘ Turbellaria’), Journal of Natural History 39 (1), pp. 1-45 : 33-34

Subfamily PORROCYSTIDINAE Evdonin, 1977

Phonorhynchus helgolandicus (Mecznikow 1865) v. Graff, 1913 Prostomum helgolandicum Mecznikov, 1865: 176–177 , pl. IV: 3.

Prostomum boreale Mereschkowsky, 1878: 43–47 , pl.: IV: 3.

Prostomum giardi Hallez, 1879: 20 , 28–30, 50, 52–53, 68, 164–169, pl. III: 1–4. Macrorhynchus helgolandicus : v. Graff, 1882: 328–331, Figure 9G , pl. IX: 22–30.

Material examined

Sites 7, 11, 14: few specimens, in squash preparation.

Geographical distribution. NW Atlantic: Canada (New Brunswick: St Andrews, Pocologan), USA (Massachusetts: Woods Hole), Davis Strait: Greenland (Holstenborg, Jakobshavn, Disko Bay); NE Atlantic: Denmark Strait ( Greenland: Scoresbysund), White Sea (Solovetzk Islands), Faroe Islands (SuderØ, ØsterØ); Ireland (Co. Kerry: Valentia, Co. Mayo, Co. Galway); North Sea: North Frisian Islands (Sylt), German Bight ( Helgoland), Norway (Bergen, Strudshavn); Irish Sea: Ireland (Co. Dublin), Isle of Man (Port Erin, Port St Mary), North Channel (Firth of Clyde: Great Cumbrae Island); English Channel ( England: Plymouth Sound); France (Concarneau, Wimereux); Baltic Sea: Gulf of Finland; Mediterranean Sea: Adriatic Sea (Gulf of Venice: Rovinj; Italy: Lesina); NE Pacific: Bering Sea, Gulf of Alaska, USA (Oregon, California) ( Gamble 1893; Hallez 1893; Southern 1912, 1936; v. Graff 1913; Steinböck 1933a, 1938; Schilke 1970; Karling 1982; Ax and Armonies 1987, 1990).

Remarks

Two specimens were collected, one sexually mature and the other a male that was not completely sexually mature. Length of the former specimen was 1.24 mm in squash preparation. The excitator stylet, based on the accessory secretory bulb, was obviously not fully developed and measures 42 M m in length. The stylet is straight, evenly tapering to a distally pointed end; proximally, a funnel-shaped opening (12 M m in diameter) encases the accessory secretory bulb. The excitator stylet is directed anteriad.

Figures

Figure 9. Haploυejdoυskya scilliensis sp. nov. (A) Dorsal view in squash preparation; (B) sclerotized male stylet. Balgetia cf. semicirculifera (C) sclerotized male stylet. Scale bars: 200 Mm (A); 10 Mm (B); 20 Mm (C).