New Nanobagrus

[Silurus]

Ng, HH, 2008. A New Species of Nanobagrus (Teleostei: Bagridae) from Southern Borneo. Copeia 2008: 93–98.

Abstract

Nanobagrus immaculatus, a new species of bagrid catfish, is described from the Kahayan River drainage in southern Borneo. Nanobagrus immaculatus is most readily distinguished from congeners in having a uniformly dark-colored body lacking pale spots or patches (vs. pale spots or patches always present), larger eye (16.7–18.2% HL vs. 9.0–16.1), and a longer adipose-fin base (24.9–26.6% SL vs. 12.8–21.6). The synapomorphies used to diagnose Nanobagrus are reviewed and re-examined. Pseudomystus fuscus is hypothesized to be more closely related to Nanobagrus than to all other Pseudomystus and is hereby reassigned to the former genus.

[Silurus]

This is Nanobagrus immaculatus. I have kept a small group for some time now. They superficially resemble short-bodied Amblyceps.

[Dinyar]

Hmm... I think I might have this fish, although mine might be stellatus. They disappeared into the undergrowth some time ago. Will have to dig them out and photograph them. Am I seeing a pattern here of fish showing up in the trade at about the same time you describe them?

[Silurus]

I think it is more likely to be N. immaculatus than N. stellatus. I have seen hundreds of N. immaculatus passing through Singapore, but not any N. stellatus.
BTW, there are some quite large shipments of catfish from southern Borneo that have passed through here, including quite a number of undescribed species.

[Silurus]

I forgot to add that another result of this study is that Pseudomystus fuscus should now be corrected to Nanobagrus fuscus in the Cat-eLog.