Planonasus indicus Ebert, Akhilesh & Weigmann

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 : 226

Planonasus indicus Ebert, Akhilesh & Weigmann

( Figs. 4E , 15 E–H)

Following up on an earlier report of what appeared to be a specimen of the poorly known Planonasus Weigmann, Stehmann & Thiel from Trincomalee Outer Harbor by Ebert et al. (2017), one of the fisheries we targeted was the deep-sea longline fishery in Mutur, Trincomalee Harbor in the Eastern Province. We were fortunate that on the second of the two days we spent at that location, fishers returned with dead bycatch retained for us. Fishing at 350 fathoms, their catch that day included a specimen (SL-107) of Planonasus allowing us to confirm the novelty of this, only the second known member of the genus. The species was recently described as Planonasus indicus (see Ebert et al. 2018). The original description was based on a holotype from India and our specimen from Sri Lanka; the latter has been designated a paratype and deposited in the BRT Ichthyology Collection (BRT-I 0029).

Ebert et al. (2017) originally reported this species from Sri Lanka as Planonasus parini Weigmann, Stehmann & Thiel.

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 15. Hemipristis elongata (Hemigaleidae) (A–D) and Planonasus indicus (Pseudotriakidae) (E–H). A. Lateral view of immature male (SL-78; BRT-I 0018). B. Falcate pectoral fins of immature male (ventral view; SL-78; BRT-I 0018). C. Ventral view of head of immature male (SL-78). D. Teeth of upper jaw of immature male (SL-78; BRT-I 0018). E. Lateral view of mature female (SL-107; BRT-I 0029). F. Ventral view of head of mature female (SL-107; BRT-I 0029). G. Teeth of upper and lower jaw of mature female (SL-107; BRT-I 0029). H. Denticles on left side below dorsal fin of mature female (SL- 107; BRT-I 0029).