Borneo river shark

The Borneo Flusshai ( Glyphis fowlerae ) is a type of river sharks ( genus Glyphis ) within the requiem sharks ( Carcharhinidae ). The shark is extremely rare and occurs only in the rivers and in light brackish water along the coast of the Malaysian state of Sabah in northeast Kalimantan.

Features

The known specimens of Borneo Flusshais were 50-78 cm long. The shark has a stocky body that is white brown gray upper side, lower side and a distinct black mark on the sides and at the base of the pectoral fins. The bottom and rear edges of fins and the tip of the tail are dark or black. The anterior edge of the pectoral fin is slightly convex. The first dorsal fin has a slightly concave posterior margin, but is not sickle-shaped. Your rear tip nearly reaching about the beginning of Bach fin base. The second dorsal fin reaches 58 to 68 % of the height of the first dorsal fin, the anal fin 74-102 % of the height of the second dorsal fin. The anal fin has a slight indentation at its rear edge. A Interdorsalkamm missing. The short rostrum is broadly rounded from above or below line of sight, the eyes are small, the injection holes are missing. The teeth are not visible in the closed mouth in the rule.

From the closely related Irrawaddy Flusshai ( Glyphis siamensis ), the Borneo Flusshai differs by the number of vertebrae ( 196-209 ), the color and the higher second dorsal fin.

Way of life

The way of life of the species is largely unknown. The type locality consists of shallow sandbars with muddy ground. The water has low salinity. He's probably like the other species of the genus are viviparous and forms a yolk sac placenta ( placental viviparous ).