Hexanchus griseus (Bonnaterre)

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 : 229

Hexanchus griseus (Bonnaterre)

( Figs. 5B , 17 E–H)

All three specimens (SL-91, SL-105, and SL-106) of Hexanchus griseus examined were seen at the landing site of the deep-sea longline fishery in Mutur in the Eastern Province. The upper and lower jaws of SL-91 have been deposited in the BRT Ichthyology Collection (BRT-I 0023). These specimens are morphologically consistent with H. griseus . All three specimens formed a tight cluster with our reference specimen of H. griseus ( JQ518727 ) from the Caribbean Sea in the tree resulting from the Neighbor-Joining analysis. They were identical in sequence to each other and differed from the reference specimen by 2 bp.

This is the name currently applied to this species in Sri Lanka (e.g., De Silva 2006, 2015; Morón et al. 1998; Joseph 1999).

Figures

FIGURE 5. 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. Echinorhinidae. B. Hexanchidae. C. Lamniformes. D. Chiloscyllium (Hemiscylliidae). E. Centrophorus (Centrophoridae). F. Somniosidae/Oxynotidae (Somniosus omitted).

FIGURE 17. Echinorhinus sp. 1 (Echinorhinidae) (A–D), Hexanchus griseus (Hexanchidae) (E–H), and Chiloscyllium sp. 1 (Hemiscylliidae) (I–K). A. Lateral view of female (SL-108). B. Ventral view of head of female (SL-108). C. Teeth of upper jaw of female (SL-108). D. Teeth of lower jaw of female (SL-108). E. Lateral view of immature male (SL-106). F. Ventral view of head of female (SL-91). G. Teeth of upper jaw of female (SL-91). H. Teeth of lower jaw of female (SL-91). I. Lateral view of mature male. J. Ventral view of head of mature male (SL-59). K. Dorsal view of head and trunk of mature male (SL-59).