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Taxon profile

species

Xanthodaphne araneosa R. B. Watson, 1881

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Raphitomidae »  genus Xanthodaphne

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Xanthodaphne araneosa

Author: Watson, R.B.

Description

Shell small, yellowish, minutely ribbed and faintly spiralled, with a small, broadish, scalar, sharp-pointed spire, a slightly swollen body-whorl and rounded base, produced into a square, prominent, one-sided snout. Sculpture: Longitudinals: there are exceedingly fine, faint, microscopic threads in the line of growth ; at distances of about 1/100 of an inch apart these rise into small, sharpish, round-topped riblets, which run continuously from the suture to the snout, though on the base and below it they become feebler; on the earlier whorls these are, of course, less marked and more close set: in the intervals of the larger riblets one or two fainter ones occasionally appear. Spirals: below the slightly concave sinus-area is an obtuse angulation, accentuated by the slight prominence of the two small spiral threads which lie there; below this there are on the body-whorl above the lip-corner about 5 other small spirals not so prominent; on the lower part of the body and on the base they are weaker, but become stronger again towards the point of the base and on the snout; the intersection of these with the spirals produces a slight spider-weblike appearance. Colour yellowish, without gloss; the apex is buff. Spire rather short and broad, scalar, and conical Apex consists of 4,5 very small, conical, scalar, convex, buff whorls, parted by a deep suture; the first whorl and a half is closely spirally striated with about 10 minute threads: these threads, which are at first almost simple, are by degrees more and more fretted by longitudinals, which break up the threads into minute tubercles: toward the end of the second whorl longitudinal and oblique bars appear somewhat vaguely and confusedly; but presently the distinct arrangement appears of short little bars above and a network on the lower part of the whorls. Whorls 7,5 in all, but the shell is very likely hardly full-grown: they are almost horizontal above, with a flat or faintly concave sinus-area, slightly angulated at the shoulder, and below this cylindrical or a very little convex to the lower suture; the last is long, a little tumid, with a long pillar-line on the left side, and a small square prominent snout on the right. Suture very slight in consequence of the up-lap of the whorls at their junction, but of course strongly marked by the angulation of the line of junction. Mouth oblong, triangularly pointed above, and ending in a very square broadish canal below. Outer lip flatly arched, with a slight angulation below the sinus-area and a marked pinch-in where it turns to form the canal; its edge-line is very straight and scarcely prominent, but has a high shoulder above, between which and the body lies the deepish, rounded, and open-mouthed sinus. Inner lip very thin and narrow, and dying out very early on the scarcely oblique, twisted, sharp pillar-edge; its line across the body is very short and convex, but is very concave at its junction with the long, scarcely oblique pillar. H. 0.22 inch. B. 0.l inch. Penultimate whorl, height 0.04 inch. Mouth, height 0.13 inch, breadth 0.04 inch.
Source: Watson, 1886. Report on the Scaphopoda and Gasteropoda collected by HMS Challenger during the years 1873-1876. Reports of the scientific results of the voyage of H.M.S. "Challenger"

Distribution

North of Culebra Island, West Indies.
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 Xanthodaphne araneosa (Watson, 1881)]
Data retrieved on: 22 November 2013

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