Marine Mammal Research Program, Texas A&M University, 4700 Avenue U, Building 303, Galveston, Texas 77551, U. S. A.
POLYDACTYLY AND OTHER FEATURES OF THE MANUS OF THE VAQUITA, PHOCOENA SINUS
Article first published online: 26 AUG 2006
Marine Mammal Science
Volume 16, Issue 2, pages 277–286, April 2000
How to Cite
Ortega-Ortiz, J. G., Villa-Ramírez, B. and Gersenowies, J. R. (2000), POLYDACTYLY AND OTHER FEATURES OF THE MANUS OF THE VAQUITA, PHOCOENA SINUS. Marine Mammal Science, 16: 277–286. doi: 10.1111/j.1748-7692.2000.tb00924.x
- Issue published online: 26 AUG 2006
- Article first published online: 26 AUG 2006
- Received: 27 November 1995, Accepted: 20 August 1999
- Phocoena sinus;
The vaquita (Phocoena sinus) manus was examined in 16 individuals. The carpus has a proximal row of three bones and a cartilaginous accessory carpal element distocaudal to the ulna. Five metacarpal bones are present. A process in distocaudal aspect of Metacarpal III and an additional digital ray were present in all individuals examined. The number of phalanges in the additional digital ray varied among individuals and, sometimes, between the left and the right flipper of the same individual. The suggested phalangeal formula is I-1, II-7-8, III-6-7, IV-0-3, V-3-4, VI-1. The presence of this particular form of polydactyly may be the result of genetic drift in the small vaquita population.