Gemmula speciosa (Reeve, 1843)

(Pl. 3, fig. 1)

Pleurotoma speciosa Reeve, 1843, pl. 2, fig. 9.

Pleurotoma (Gemmula) speciosa .—Tryon 1884: 173, pl. 4, fig. 48. Turris (Gemmula) guadurensis .— Melvill 1917: 145.

Gemmula speciosa .— Powell 1964: 245, pl. 186, fig. 1; Olivera 2004b: 3, fig. 1.

Material examined. Beibu Gulf. 1 spm, X43 B-63, 17 °30’N, 107°00’E, 50 m, muddy sand, AT, 11. XI. 1959; 1 spm, R190B-92, 20 °15’N, 108°30’E, 61.5 m, sandy mud, 15. IV. 1960; 6 spms, X228B-, 52 m, medium sand, AT, 17. VIII. 1962; 1 spm, X188B-95, 18 °00’N, 106°40’E, 33 m, clay, AT, 10. IV. 1962; 1 spm, X195B- 102, 19 °00’N, 106°30’E, 43 m, fine sandy clay, AT, 11. IV. 1962; 1 spm, CN X175B-30, 20 °40’N, 108°30’E, fine sandy silt, 49 m, AT, 22. I. 1962; 1 spm, CN X200B-15, 19 °30’N, 108°30’E, silt, 51 m, AT, 13. IV. 1962. SCS. 2 spms, Sanya, Hannan Island, intertidal zone, 1958; 1 spm, CN 58M-284, Sanya, Hannan Island, intertidal zone, 2. IV. 1958; 2 spms, K164B-28, 20 °00’N, 113°30’E, 129 m, muddy sand, AT, 9. IV. 1960; 1 spm, CN N214B-33, 17 °00’N, 109°00’E, sandy mud, 108 m, AT, 15. V. 1960; 3 spms, CN N215B-36, 17 °00’N, 108°30’E, fine sandy mud, 93 m, AT, 15. V. 1960; 1 spm, CN Q83B-52, 18 °00’N, 109°30’E, muddy sand, 68 m, AT, 21. XI. 1959. Nansha Islands. 1 spm, SSMIV-8, 4 °30’N, 112°15’E, 78 m, clay, middle-level trawl, 11. V. 1987; 1 spm, Ns4B-13, 6 °00’N, 111°20’E, 105 m, fine sandy clay, 7. XI. 1993; 1 spm, SSB11-10, 4 °30’N, 111°30’E, 80 m, 23. IX. 1994.

Measurements (mm).

Distribution. Beibu Gulf, South China Sea, Nansha Islands; Arabian Sea, Japan, Philippines. The species is common in the South China Sea. The north limited distributed range of this species is northern South China Sea.