Marginellona gigas
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| Marginellona gigas | ||||||||||||||||||||||||
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 Marginellona gigas
trawled 600m Pratas Isl., Taiwan |
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| Marginellona gigas Martens, 1904 |
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Sigaluta pratasensis Rehder, 1967 |
Marginellona gigas is a species of very large deepwater sea snail, a marine gastropod mollusk in the family Marginellidae.
This species was originally thought to be a volute, in the family Volutidae, but it is in fact a giant marginellid.
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[edit] Shell description
Shell to 157 mm, thin, translucent, porcellaneous, narrowly ovate. Protoconch of 2-2½ rapidly expanding (diameter 0.5 mm to 11.5 mm in 2 whorls), smooth, conical, glassy whorls, deflected from coiling axis of teleconch by up to 15º. Transition to teleconch abrupt, marked by growth line, and accompanied by formation of thin parietal callus. Teleoconch with up to 3 smooth, inflated, convex, rapidly descending whorls. Suture with abutting Whorls. Shell surface smooth, glazed lacking spiral and axial sculpture. Aperture ovate, narrow posteriorly, broad anteriorly. Outer lip smooth. Inner lip smooth, with thin, whitish inductural overglaze in some specimens. Columella with single sharp, axially oriented columellar fold and sharp siphonal fold of nearly equal magnitude. Outer shell surface uniformly tan to greenish-tan; aperture darker brown.
[edit] Type locality
W. of Sombrero Channel, Nicobar Islands, Indian Ocean, 07º48'N, 92º07'E, in 805m, coarse sand.
[edit] Range
This species has been collected in the eastern Indian Ocean (Nicobar Islands) and on the upper continental slope along the western margin of the South China Sea. The bathymetric range is 380-1000 m.
[edit] Reports
W. of Pratas Reef, South of China Sea, 20º37'N, 115º43'E [380 m]
E. of Phan Thiet, Vietnam, South China Sea, 10º41'08"N, 109º53'08"E [495-500 m]
E. of Phan Ly, Vietnam, South China sea, 11º09'06"N, 110º02'00"E [700 m]
E. of Phan Thiet, Vietnam, South China Sea, 10º01'00"N, 109º55'00"E [460 m]
E. of Ba Ria, Vietnam, South China Sea, 10º40'08"N, 110º03'00"E [760-800 m]
E. of Phan Ly, Vietnam, South China sea, 11º10'00"N, 110º10'00"E [1000-1280 m]
[edit] References
- Harasewych, M. G. and Y. I. Kantor. 1991. Rediscovery of ... Nemouria 37:1-19.
- Lan 1994. World Shells, 8:74-76
- Martens, Eduard C. von and Johannes Thiele 1904. Die beschalten Gastropoden der deutscen Tiefsee-Expedition 1898-1899, 7:147-180,pls. 6-9
- Rehder, Harold A. 1967. Pacific Science, 21(2):182-183; txt-figs. 1-4
- Thiele, Johannes 1929. Handbuch der systematischen ... :356
- Tomlin, John Reed le Brockton 1917. Proc. Malac. Soc., Vol XII, part V-VI:242-306
- Weaver, C.S and J.E. duPont 1970. The Living Volutes :99; plt. 40, figs. H,I
- Wenz 1943. Gastropoda: 1380;fig.3903
