Ondina obliqua (Alder, 1844)

Figure 83

Odostomia obliqua Alder, 1844:327

Odostomia obliqua Alder - Alder 1848; Forbes & Hanley 1850 - 51; Jeffreys 1867; Marshall 1893, 1900

Chemnitzia obliqua (Alder) - Clark 1855

Ptychostomon obliquum (Alder) - Kobelt 1903

Odontostomia (Ondina) obliqua (Alder) - Dautzenberg & Fischer 1925

Menestho (Evalea) obliqua (Alder) - Winckworth 1932; Høisaeter 1986

Ondina obliqua (Alder) - van Aartsen 1987; Smith & Heppell 1991; Warén 1991; Peñas et al. 1996; Høisaeter 2009

Type material: Not known.

Type locality: Tynemouth, outside Newcastle, North Sea coast of England (fide Jeffreys 1867) .

Material seen: Norway - Hordaland, 2 shs.

Diagnosis: Shell: Distinguished by its upturned and almost disjoint protoconch and the rapidly increasing whorls. Soft parts: Not known. Operculum: Not known.

Biology: Not known.

Distribution: Not previously recorded from Norway. In my material a large specimen from Fitjar (59°54’ N, 18 m, leg. Per Johannessen) and a single old and worn shell from Raunefjorden (Hillersholmen, c. 60°18’ N, 8 m, coarse shell gravel), possibly subfossil. Outside Norway known from the Swedish west coast (Koster area, Warén 1991) and the British Isles south to the Biscay (Fretter et al. 1986) and the Mediterranean, quite rare (Warén 1991). Mentioned from the Scottish North Sea coast, (McKay & Smith 1979). Sparingly in the western Mediterranean (Peñas et al. 1996).

Remarks: A reference to G.O. Sars (1878) in Høisaeter (2009) is due to a misunderstanding. The shell at left in Figure 83 has lost the upturned protoconch. It has a golden brown surface which might be due to a periostracum. It is reported as being quite rare throughout its distribution, and is obviously extremely rare in Norwegian waters.