Segama

Gastromyzon lepidogaster is a hillstream loach from northern Borneo and the most widely-distributed member of the genus. It occurs in Sabah, Brunei and East Kalimantan. Colour is variable: large adults may be bright green, orange or barred, and can apparently change from barred to plain in a few seconds. It is occasionally available in the trade, where the orange form is particularly sought after.

Crossocheilus elegans is a cyprinid known only from the Segama and Kinabatangan river systems in Sabah, northern Borneo. It is mostly collected in or near the riffles of fast-flowing, rocky headwater hill streams. A pale yellowish brown stripe between the dark brown back and the blackish midlateral stripe separates it from other black-striped Crossocheilus, and before its description it was referred to as Epalzeorhynchos kalliurus and C. cobitis.

Hampala sabana is a large riverine cyprinid endemic to the Malaysian state of Sabah in northern Borneo. It inhabits clear, well-oxygenated running water and apparently favours deeper, slower-moving stretches. It has a single body marking and a higher count of circumpeduncular scales than its congeners. Growing to 410 mm SL, it is poorly known in the ornamental trade, and its size more-or-less precludes it as an aquarium fish.

Luciosoma pellegrinii is a slender, pike-like cyprinid endemic to Borneo, ranging from the Kapuas in West Kalimantan to Sabah. It is scarcely known in the aquarium trade because it comes from an area where very few commercial collections take place, but its name is misapplied on a regular basis. It has 4 to 8 distinct dark spots on the lateral line and appears to develop longer pelvic-fin filaments than any other member of the genus.

Nematabramis borneensis is a cyprinid endemic to the Malaysian state of Sabah in northern Borneo. It looks particularly similar to N. alestes, sharing a dark lateral stripe, but is told apart immediately by its barbels, which are longer than the head.

Nematabramis everetti is a cyprinid endemic to Borneo, known from Sarawak and Sabah plus East and North Kalimantan. It has a distinctive dark, vertically-elongate humeral marking, more prominent than in other Nematabramis species. Juveniles and subadults appear to favour fast-moving water, while adults are found in deeper, slower stretches of minor tributaries.