Gemmula congener explained

Gemmula congener, common name Melvill's turrid, is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.

Synonyms

Gemmula congener cosmoi (Sykes, 1930): synonym of Gemmula cosmoi (Sykes, 1930)
Gemmula congener diomedea Powell, 1964: synonym of Gemmula diomedea Powell, 1964
Gemmula congener unilineata Powell, 1967: synonym of Cryptogemma unilineata (Powell, 1967) (basionym)
Gemmula congener webberae Kilburn, 1975: synonym of Gemmula webberae Kilburn, 1975

The length of the shell varies between 40 mm and 90 mm.

This marine species occurs in the Indo-West Pacific, in the Bay of Bengal, off the Philippines and off Western Australia; in the East China Sea, northern South China Sea and Nansha Islands; off Japan.

Schepman, M.M. 1913. Toxoglossa. pp. 384–396 in Weber, M. & de Beaufort, L.F. (eds). The Prosobranchia, Pulmonata and Opisthobranchia Tectibranchiata, Tribe Bullomorpha, of the Siboga Expedition. Monograph 49. Siboga Expeditie 32(2)
Melvill, J.C. 1917. A revision of the Turridae (Pleurotomidae) occurring in the Persian Gulf, Gulf of Oman and North Arabian Sea as evidenced mostly through the results of dredging carried out by Mr. F.W. Townsend, 1893–1914. Proceedings of the Malacological Society of London 12(4-5): 140-201
Powell, A.W.B. 1964. The Family Turridae in the Indo-Pacific. Part 1. The Subfamily Turrinae. Indo-Pacific Mollusca 1: 227-346
Kilburn R.N. (1975). Taxonomic notes on South African marine Mollusca (5): including descriptions of new taxa of Rissoidae, Cerithiidae, Tonnidae, Cassididae, Buccinidae, Fasciolariidae, Turbinellidae, Turridae, Architectonicidae, Epitoniidae, Limidae and Thraciidae. Annals of the Natal Museum 22(2):577-622, figs. 1-25.
: figs 1-25
Wilson, B. 1994. Australian marine shells. Prosobranch gastropods. Kallaroo, WA : Odyssey Publishing Vol. 2 370 pp.
Liu, J.Y. [Ruiyu] (ed.). (2008). Checklist of marine biota of China seas. China Science Press. 1267 pp
Li B. [Baoquan] & Li X. [Xinzheng]. (2008). Report on the turrid genera Gemmula, Lophiotoma and Ptychosyrinx (Gastropoda: Turridae: Turrinae) from the China seas. Zootaxa. 1778: 1-25.