Fig. 3 in Evolutionary and developmental aspects of phalangeal formula variation in pig-nose and soft-shelled turtles (Carettochelyidae and Trionychidae)

Fig. 3 Hyperphalangy charac- terizes trionychid but not carettochelyid turtles. Adult Carettochelys insculpta (MTD 30761) show elongated phalanges and the formula 2-3- 3-3-3 for both manus (a) and pes (b). In Cyclanorbis senegalensis the formula for the manus is 2-3-3-6-5 (c; MTD 44951) or 2-3-3-5-4 (d; MTD 39162). (e) Manus of Pelodiscus sinensis (MTD 30740), formula 2-3-3-5-5. The phalangeal formula for the pes is less variable; Lissemys punctata (MTD 32372) exhibits the formula most frequent in trionychids, 2-3-3-4-3 (f). Note that the trionychid phalanges of digits I and II are much more robust than those of the other digits, and that the terminal phalanges of digits IV and V can be very small. Roman numerals denote digits, Arabic numerals the number of phalanges of the labelled digit