Hyalogyrina Marshall, 1988

Nakrem, Hans Arne, 2017, Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard, Zootaxa 4329 (4), pp. 351-374 : 364

Genus Hyalogyrina Marshall, 1988

Type species. Hyalogyrina glabra Marshall, 1988 ; original designation. New Zealand, Recent.

Remarks. Hyalogyrinidae unite small, largely smooth-shelled lower heterobranchs which differ from each other mostly in radular characters. Warén & Bouchet (1993) argue that Hyalogyrina Marshall, 1988 , and Hyalogyra Marshall, 1988 differ in the type of protoconch ― hyperstrophic and not hyperstrophic, respectively. Our shells seem to have a hyperstrophic protoconch and this is why we classify them in Hyalogyrina . There are a number of similar genera described from the fossil record: Bandellina Schröder, 1995 , Alexogyra Bandel, 1996, Carboninia Bandel, 1996 and Doggerostra Gründel, 1998 , which differ from each other only in minor details. This led Kaim (2004) to synonymize them all in the genus Bandellina Schröder, 1995 . It seems, however, that the majority of these forms might instead be classified in Hyalogyrina Marshall, 1988 as they form a continuum of morphologically similar forms with a hyperstrophic protoconch, with the name Hyalogyrina having priority. Bandel (1996) stated that his Triassic genus Alexogyra differs from the Recent genus Hyalogyra in being smaller and having more protoconch whorls.