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species

Chrysallida turbonillaeformis Aartsen, Gittenberger & Goud, 2000

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Allogastropoda »  family Pyramidellidae »  genus Chrysallida

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Chrysallida turbonillaeformis

Author: Aartsen, van, Gittenberger & Goud

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Description

Shell whitish, forming a lengthened cone with straight sides and a blunt top. Embryonic whorls smooth and intorted. Teleoconch with six to over seven rather flat whorls. Suture incised but not deep. Growthlines sigmoidal, coinciding with the axial ribs. Shell with somewhat inverted-S-shaped, opisthocline, axial ribs, slightly narrower than the interstices; there are twelve to sixteen of these ribs per teleoconch whorl. No spiral sculpture can be detected. Umbilicus absent. Columella straight and vertical, smooth.
Dimensions: H. 3.2-3.7 mm, W. 1.1-1.2 mm; holotype 3.2 x 1.1 mm.
Aartsen, J.J. , Gittenberger, E. & Goud, J., 2000. Pyramidellidae (Mollusca, Gastropoda, Heterobranchia) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern part of the North Atlantic Ocean (part 2)

Interchangeable taxa

In shape and sculpture this species looks very much like a Turbonilla species. The intorted embryonic whorls exclude it from that genus, however, and point to Chrysallida. This species does not fit well into any Chrysallida subgenus and, therefore, we classify it as Chrysallida s.l. Chrysallida turbonillaeformis spec. nov. is somewhat similar to C. sigmoidea (Monterosato, 1880), but shells of that species are smaller and more slender, and have many conspicuous spiral riblets or striae, which are lacking in C. turbonillaeformis.
Aartsen, J.J. , Gittenberger, E. & Goud, J., 2000. Pyramidellidae (Mollusca, Gastropoda, Heterobranchia) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern part of the North Atlantic Ocean (part 2)
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Chrysallida turbonillaeformis Aartsen, Gittenberger & Goud, 1998]
Data retrieved on: 23 November 2013

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