Somniosidae, D.S.Jordan, 1888

Elasmobranch, Its Implications For Global, Parasitology, Diversity And, Naylor, G. J. P., Sc, Caira, J. N., Ct, Jensen, K., Ks, Rosana, K. A. M., Fl, White, W. T., Csiro, Tas, Last, P. R., Csiro & Tas, 2012, A Dna Sequence-Based Approach To The Identification Of Shark And Ray Species And Its Implications For Global Elasmobranch Diversity And Parasitology, Bulletin of the American Museum of Natural History 2012 (367), pp. 1-262 : 61-62

Somniosidae (sleeper sharks), in part

Centroscymnus coelolepis (Portuguese dogfish)

( fig. 45)

A total of 18 specimens of this species were included in the analysis. These came from the western North Atlantic , mid-Atlantic ridge, Madeira , Scotland, and Tasmania , and thus represent all but the South Atlantic and North Pacific elements of the distribution of this species. The three specimens from Madeira are deposited in the Museu de História Natural e Aquário in Funchal (GN6616 5 MMF 36129, GN6626 5 MMF 36784, and GN6606 5 MMF 36090). Despite the disparate localities from which these specimens came, they were remarkably homogeneous in NADH2 sequence ; the range in pairwise differences among these 18 specimens was 0–2, with an average of 1.1.

Centroscymnus owstonii (roughskin dogfish)

( fig. 45)

The 17 included specimens of this species were collected from the mid-Atlantic Ridge, Madeira, coastal mainland Portugal, and New Zealand. The analysis yielded a single

cluster. The range of pairwise differences among these 17 specimens was 0–6, with an average of 1.8. A number of specimens taken from Portugal and New Zealand were identical in sequence. The six specimens collected from Madeira are deposited in the Museu de História Natural e Aquário in Funchal (GN6598 5 MMF 36021, GN6599 5 MMF 36044, GN6600 5 MMF 36058, GN6623 5 MMF 36739, GN6619 5 MMF 36142, and GN6625 5 MMF 36741). This species clustered most closely with C. coelolepis . The average of the pairwise differences between C. owstonii and C. coelolepis was 74.7 (or 7.15 %). This result is somewhat more conservative than that of Moura et al. (2008) who found the genetic divergence between these two species to be 12.8 %.