The Pondicherry Shark is a very rare and little-known speciesof requiem shark, family Carcharhinidae. Not seen since 1979, this species is listed as Critically Endangered by the International Union for Conservation of Nature (IUCN), and may be extinct.
The Pondicherry Shark is rather thick-bodied, with a moderately long, pointed snout. Each nostril is a broad slit preceded by a small, nipple-shaped flap of skin. The eyes are large and circular. The mouth is arched, without prominent furrows at the corners. There are 12–14 tooth rows on each side of both jaws, in addition to 1–2 small teeth at the symphysis (center). The teeth have a single narrow cusp, with those in the upper jaw wider and more angled than those in the lower jaw, and sometimes weakly serrated.
The pectoral fins are short and falcate (sickle-shaped) with pointed tips, originating below the fourth gill slit. The first dorsal fin is tall, with a distinctive long free rear tip, and originates just behind the pectoral fin insertions. The second dorsal fin is long, but low, and positioned about opposite the anal fin. There is a low ridge between the dorsal fins. The dermal denticles are oval and overlapping, with three (sometimes five) horizontal ridges leading to small marginal teeth. This species is plain gray above and white below, which extends in an obvious band onto the flanks. The pectoral, second dorsal, and caudal fins are tipped in black, while the other fins darken toward the margins.
It inhabits inshore waters and brackish water in the lower stretches of the Hooghli and the Saigon River
Its diet likely consists of small bony fishes, cephalopods, and crustaceans.