Rhizoprionodon acutus (Rüppell),

Fernando, Daniel, Bown, Rosalind M. K., Tanna, Akshay, Gobiraj, Ramajeyam, Ralicki, Hannah, Jockusch, Elizabeth L., Ebert, David A., Jensen, Kirsten & Caira, Janine N., 2019, New insights into the identities of the elasmobranch fauna of Sri Lanka, Zootaxa 4585 (2), pp. 201-238: 223

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Rhizoprionodon acutus (Rüppell)


Rhizoprionodon acutus (Rüppell) 

( Figs. 4BView FIGURE 4, 14View FIGURE 14 I–J)

The existence of undescribed diversity in the Rhizoprionodon acutus  species complex complicates identification of the single specimen (SL-21) of this complex we encountered in the Erinchamman Kovilady market in Point Pedro in the Northern Province. Based on the molecular and morphological data presented by Caira & Jensen (2015), the specimen from Sri Lanka is most similar to R. acutus  from the Gulf of Oman, rather than to any of the numbered designations (i.e., Rhizoprionodon cf. acutus  1, Rhizoprionodon cf. acutus  2, and Rhizoprionodon cf. acutus  3) for the three undescribed members of this species complex recognized by Naylor et al. (2012a). In the tree resulting from our Neighbor-Joining analysis, which included all seven described members of the genus and all three undescribed member of the R. acutus  complex, the specimen from Sri Lanka grouped most closely with the reference specimen of R. acutus  (MM-4; JQ518653View Materials) from the Gulf of Oman, differing from this specimen by only 1 bp. In contrast, it differed from our reference specimen of R. cf. acutus  1 from Senegal (SE-219; JQ518652View Materials) by 10 bp, from our reference specimen of R. cf. acutus  2 from Australia (AU-120; JQ518649View Materials) by 13 bp, and from our reference specimen of R. cf. acutus  3 from Malaysian Borneo (HBO-30; JQ519100View Materials) by 18 bp.

This name is in current use for this species in Sri Lanka (e.g., De Silva 1984 –1985, 2006, 2015; De Bruin et al. 1995; Joseph 1999).