Chrysallida brattstroemi ( Warén, 1991 )

Høisaeter, Tore, 2014, The Pyramidellidae (Gastropoda, Heterobranchia) of Norway and adjacent waters. A taxonomic review, Fauna norvegica 34, pp. 7-78 : 22

Chrysallida brattstroemi ( Warén, 1991)

Figure 22

Chrysallida brattstroemi sp.n. - Warén, 1991:100

Chrysallida brattstroemi Warén - Micali et al. 1993 ; Peñas et al. 1996; Høisaeter 2009

Type material: Holotype (1.15 mm) and 20 paratypes, SMNH 4094 and 4095.

Type locality: Skagerrak, 58°54’N, 10°33’E, 200-220 m, mud with arenaceous foraminifera.

Material seen: Norway - Hordaland, 12 spms ; Nord-Trøndelag, 1 spm and 13 shs; Nordland, 3 shs.

Diagnosis: Shell: small (max. 1.25 mm), colourless, with few whorls and strong axial ribs continuing down to the base and into the umbilicus, three much weaker spiral cords not crossing the axial ribs. Protoconch depressed and pertfectly smooth. Soft parts: Not known. Operculum: Not known.

Biology: Not known.

Distribution: This species was described from 21 specimens from a sample taken just south of Faerder in the Skagerrak (58°54’N, 10°33’E, 200-220 m). Warén reported in addition five specimens from the shelf outside Korsfjorden (60°08’N, 250 to 380 m) and a single shell from Trondheimsfjorden. In my material 13 specimens and 16 shells. Three shells from Tomfjorden (66°12’N, 380- 300 m, mixed bottom), one specimen and one shell from outer part of Bindalsfjorden, (65°12’N, 12°10’E, 510- 460 m, soft bottom), and four samples from Risvaer-fjorden (65°N, 11°29’E, 100-200 m, shells only). Finally 12 well preserved specimens from the shelf outside Korsfjorden (60°07.5’N, 4°51’E, 317- 315 m, silty sand with lots of foraminiferans; coll. and leg. A. Warén). Outside Norway known from the Italian Lower Pleistocene and as Recent from the western Mediterranean ( Warén 1991, Micali et al. 1993, Peñas et al. 1996).

Remarks: This species seems to have a more southern distribution than C. eximia (not known south of western Scotland), C. hoeisaeteri and C. bjoernssoni . These also have a narrower and longer shell. I provisionally place it in a group together with these species, although the relationship might be to some more southern, deep water species, e.g. C. stefanisi ( Jeffreys, 1869) .