Springer's Sawtail Catshark

The largest known specimen of the Springer's sawtail catshark measured 48 cm (19 in) long. It has a slender body and a somewhat flattened head with a long, pointed snout. The eyes are horizontally oval and equipped with rudimentary nictitating membranes (protective third eyelids); they are followed by tiny spiracles and lack prominent ridges underneath. The nostrils are divided by triangular flaps of skin on their anterior rims. The large mouth forms a wide arch, and bears moderately long furrows at the corners. The teeth are small and have a narrow central cusp flanked by multiple cusplets; they are similar in both jaws, and between sexes. There are five pairs of gill slits. The first dorsal fin has a blunt apex and is placed over the aft part of the pelvic fins. The second dorsal fin is similar in shape and nearly equal in size to the first, and placed over the aft part of the anal fin. The pectoral fins are fairly large and broad. The small pelvic fins are low relative to their bases, and have angular margins. The anal fin is elongated and placed close to the pelvic and caudal fins; the anal fin base measures 11% of the total length, about comparable to the space between the dorsal fins. The caudal fin has a small lower lobe and a ventral notch near the tip of the upper lobe. …

The range of the Springer's sawtail catshark is limited and overlaps that of the similar Antilles catshark; it occurs off Cuba, Jamaica, Hispaniola, Puerto Rico, the Leeward Islands, and probably the U.S. Virgin Islands. The full extent of its distribution is uncertain due to confusion with related species. Recorded from depths of 457 to 699 m (1,499 to 2,293 ft), this species is found on or near the bottom over upper continental and insular slopes.

There is little known of the natural history of the Springer's sawtail catshark. Reproduction is presumably oviparous; other females of the G. arae complex produce flask-shaped egg capsules around 5 cm (2.0 in) long, with tendrils at the upper two corners. Adult males have yet to be captured; the largest immature male measured 32 cm (13 in) long. Females are mature by a length of 43 cm (17 in).