Rhizoprionodon oligolinx Springer, 1964

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

Rhizoprionodon oligolinx Springer

( Figs. 4B , 14 K–L)

Three specimens that were morphologically consistent with Rhizoprionodon oligolinx were examined from the Supparmadam (SL-22) and Kottadi (SL-53, SL-54) markets in Point Pedro in the Northern Province. In the tree resulting from the Neighbor-Joining analysis, they grouped most closely with our reference specimen of R. oligolinx (BO-475; JQ519096 ) collected from Malaysian Borneo. They differed from one another by 0–3 bp and from the reference specimen by 8–9 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; Morón et al. 1998).

Figures

FIGURE 4. Neighbor-Joining trees of p-distances based on 1,044 bp of aligned NADH2 sequence data for individual selachian genera or groups of genera. Taxon names are followed by country, host specimen number (in parentheses), and GenBank number. Outgroup taxa used in each analysis were omitted from the individual trees. Scale bar values indicate substitutions per site. Specimens deposited in the Blue Resources Trust Ichthyology Collection are indicted by stars (see text for details). A. Carcharhinus and close relatives (Carcharhinidae). B. Rhizoprionodon (Carcharhinidae). C. Galeocerdidae. D. Hemigaleidae. E. Pseudotriakidae. F. Sphyrnidae. G. Iago (Triakidae).

FIGURE 14. Carcharhinus amblyrhyncoides (A–D) and C. cf. limbatus (E–H) (Carcharhinidae), and Rhizoprionodon acutus (I–J) and Rhizoprionodon oligolinx (K–L). A. Lateral view of female (SL-18). B. Ventral view of head of female (SL-18). C. Teeth of upper jaw of female (SL-18). D. Teeth of lower jaw of female (SL-18). E. Lateral view of immature female (SL- 52). F. Ventral view of head of immature female (SL-52). G. Teeth of upper jaw of immature female (SL-52). H. Teeth of lower jaw of immature female (SL-52). I. Lateral view of mature female (SL-21). J. Ventral view of head of mature female (SL-21). K. Lateral view of maturing male (SL-22). L. Ventral view of head of mature male (SL-53).