Rhinobatidae

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 : 89

Rhinobatidae (guitarfishes): group 1

Rhinobatos productus (shovelnose guitarfish) and

Rhinobatos glaucostigma (speckled guitarfish)

( fig. 68)

The analysis included 11 specimens identified as R. productus and eight identified as R. glaucostigma , all but one of which came from the Gulf of California; one of the specimens of R. productus was collected from the coast of California. The analysis yielded a single cluster comprised of specimens of both species with no clear subclustering of species within this cluster. The range in pairwise differences among the 19 specimens was only 0–7, with an average of 3.6. Nonetheless, these species differ markedly in morphology, most conspicuously in maximum length and color pattern. Thus, we have retained the specific identities of specimens within this cluster in order to call attention to the discrepancy between the molecular and morphological results in this case. The average of the pairwise differences between specimens identified as R. productus and R. glaucostigma was 4.9.

Pristidae (modern sawfishes): genus Anoxypristis

Anoxypristis cuspidata (narrow sawfish) ( fig. 68)

The seven specimens of this species included in the analysis all came from northern and eastern Australia and the range in pairwise differences was 0–1. Given the relatively broad distribution of this species, which includes much of the Indo- West Pacific, these specimens represent the only theeasternpartsofitsdistribution.Itisinteresting to note that these specimens grouped conspicuously away from the five other species of sawfishes of the genus Pristis included in the analysis. Furthermore, the range of pairwise differences between specimens of A. cuspidata and P. pectinata , P. zijsron , P. clavata , P. perotteti , and P. microdon was 159.2, 155.3, 151.4, 168.7, and 166.1, respectively.