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Comprehensive Description

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Description

"Falsilunatia eltanini n.sp. (Fig. 238)

 

MATERIAL EXAMINED: Eltanin Stns 350, 724, 726.

 

DISTRIBUTION: Known only from deep water to the west of South Georgia and from the South Antilles Basin in 2452-2855 m.

 

DESCRIPTION: Shell of medium size, turbiniform, solid for a deep-water species, openly umbilicate. Height about equal to the diameter, spire relatively low. Protoconch worn in all available material. Whorls about 4 1/2, whorl outline evenly rounded, suture abutting. Surface of shell sculptured by growth lines, most strongly marked just below suture on early spire whorls, and by extremely fine spiral striae, in combination giving surface a rather silky appearance. Epidermis fairly thick, pale brown in colour, with slightly darker axial streaks. Aperture ovate, inner lip forming a moderately thick glaze over parietal area. Columella thickened and reflected to partially cover relatively wide, deep, open umbilicus.

 

MEASUREMENTS: height 18.0 mm, diameter 18.5 mm (holotype).

 

HOLOTYPE: from Eltanin Stn 726, in National Museum of Natural History, Washington (USNM 860109).

 

REMARKS: Although the animal is unknown this species is described since the outline, the solid shell, and the wide umbilicus render it readily recognisable and because so little is known of the fauna of the South Antilles Basin and adjacent deep-water areas. The specimens from Stns 350 and 724 are small but readily identifiable as this species. It seems best placed in Falsilunatia on shell characters. It is closest to F. notorcadensis n.sp., differing in the more attenuate spire outline, the very fine sculpture and the colour of the periostracum."

 

(Dell, 1990: 152)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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