Urotrygonidae

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 : 78

Urotrygonidae (round stingrays)

Urobatis concentricus (bullseye stingray) ( fig. 60)

Five specimens of this species were includ- ed in the analysis, which yielded a single cluster. These specimens were collected from the Gulf of California and are thus representative of the distribution of this species. One of these specimens was deposited in the Texas Cooperative Wildlife Collection (GN2275 5 TCWC 7580.01). The range in pairwise differences among these specimens was 0–4, with an average of 1.6.

Urobatis maculatus (Cortez round stingray) ( fig. 60)

All five specimens of this species included in the analysis were collected from the Gulf of California and thus are representative of the distribution of this species in general. The analysis yielded a single cluster. The range of pairwise differences among specimens in this cluster was 0–6, with an average of 2.8. This cluster grouped closely with that comprised of the specimens of U. concentricus . The average of the pairwise differences among specimens of these two species was 11.1.

Urobatis halleri (round stingray) ( fig. 60)

The nine specimens included in the analysis all came from the Gulf of California and thus are representative of the more northern elements of the distribution of this species, which occurs as far south as Panama. The range in pairwise differences among these specimens was 0–8, with an average of 4. This cluster grouped outside that consisting of specimens of U. concentricus and U. macula- tus. The average of the pairwise differences between specimens of this species and those of U. concentricus was 53.2 and between this species and U. maculatus was 58.8.

Urotrygon rogersi (lined round stingray) ( fig. 60)

Two specimens of this species were includ- ed in the analysis, both collected from the Gulf of California and thus represent the northern portion of the distribution of this species, which occurs as far south as Ecuador. One of these specimens was deposited in the Texas Cooperative Wildlife Collection (GN5250 5 TCWC 7567.04). The specimens differed by five bases.

Urotrygon cf. simulatrix ( fig. 60)

One specimen of this species was included in the analysis. The specimen clustered along with, but outside the two specimens of U. rogersi . The average of the pairwise differences between specimens of these two species was 185.5.

Urobatis jamaicensis (yellow stingray) ( fig. 60)

Both specimens of this species included in the analysis were collected from the Cayman Islands and thus come from essentially the center of the distribution of this species, which occurs throughout much of the subtropical and tropical western seaboard of the Atlantic Ocean including the Caribbean Sea and Bahamas. These specimens were identical in sequence. They clustered most closely with the specimens of U. rogersi and U. cf. simulatrix ; the average of the pairwise differences between specimens of U. jamaicensis and the latter two species was 180.5 and 184, respectively.