Honeycomb whipray

Lore & Background

Dutch ichthyologist Pieter Bleeker first referenced the honeycomb whipray as Trygon undulata in an 1850 list of Javanese fishes, and formally described it two years later based on three specimens caught off Jakarta and Semarang. Later authors assigned it to the genus Himantura. Other common names include Bleeker's variegate ray and ocellate whipray. The species is closely related to the reticulate whipray (H. uarnak), the leopard whipray (H. leoparda), the fine-spotted leopard whipray (H. tutul), and the Australian whipray (H. australis), leading to frequent misidentification: H. undulata, H. leoparda and H. tutul have often been mistaken for H. uarnak, while many references to 'H. undulata' are actually of H. leoparda, with the synonym H. fava used for the real H. undulata.

The honeycomb whipray has a diamond-shaped, rather thin pectoral fin disc slightly wider than long, with broadly rounded outer corners and a pointed, protruding snout. Its tail is thin and whip-like, about twice as long as the disc, lacking fin folds. Adults have a broad band of small, flattened dermal denticles running centrally from before the eyes over the back onto the tail, with an enlarged, round 'pearl' denticle at the center of the disc trailed by 2–3 smaller thorns. Juveniles have large, well-spaced dark spots; with age, the dorsal coloration becomes a honeycomb-like pattern of large, nearly black rings and reticulations separated by thin yellow lines. The underside is white.

Reader's Guide

The honeycomb whipray is significant as a large, inshore stingray species whose range and identity have been obscured by confusion with similar relatives. Its endangered status, assessed by the IUCN, reflects heavy fishing pressure from commercial and artisanal fisheries using tangle nets, bottom trawls, Danish seines, and occasionally longlines, primarily for its meat, though skin and cartilage may also be used. Fishing pressure is intensifying in areas such as the Gulf of Thailand, and its inshore habits make it particularly susceptible to habitat degradation from coastal development, water pollution, and destructive practices like blast fishing. The species' reproductive biology is typical of stingrays—aplacental viviparous with histotroph provisioning—and newborns are larger than those of the similar H. leoparda. Its legacy is one of a poorly understood but heavily exploited ray, with ongoing taxonomic confusion complicating conservation efforts.

Did You Know?

• The honeycomb whipray was first referenced by Dutch ichthyologist Pieter Bleeker as Trygon undulata in 1850.
• Newborns measure about 26–27 cm (10–11 in) across, larger than the similar H. leoparda.
• The IUCN has assessed this species as endangered due to heavy fishing pressure and habitat degradation.