“…Thanks to recent studies, taxonomic ambiguities of previously described species have been substantially clarified (e.g., McLaughlin & Haig 1996;McLaughlin & Clark 1997;McLaughlin & Dworschak 2001;McLaughlin & Holthuis 2001;McLaughlin 2002;2005;Siddiqui & McLaughlin 2003;Siddiqui et al 2004;Korn et al 2008;Komai et al 2012), though reappraisal of several specifies still remains necessary. From India and its adjacent waters, the following 19 species of the genus have been recorded: D. alias McLaughlin & Holthuis, 2001, D. avarus Heller, 1865, D. bicristimanus Alcock, 1905, D. costatus Henderson, 1893 (Fabricius, 1798), D. dubius (Herbst, 1804), D. fasciatus Rahayu & Forest, 1995, D. investigatoris Alcock, 1905, D. karwarensis Nayak & Neelakantan, 1989, D. klaasi Rahayu & Forest, 1995, D. lophochir Morgan, 1987, D. maclaughlinae Nayak & Neelakantan, 1985 manaarensis (Henderson, 1893), D. miles (Fabricius, 1787), D. persicus (Nobili, 1905), D. planimanus Henderson, 1893, D. rectimanus Miers, 1884, D. tirmiziae Siddiqui & McLaughlin, 2003, D. violaceus Henderson, 1893 waltairensis Kamalaveni, 1950 (Henderson 1893;Alcock 1905;Kamalaveni 1950;Nayak & Neelakantan 1985Thomas 1989;Siddiqui & McLaughlin 2003;Siddiqui et al 2004;McLaughlin 2005;Reshmi...…”