Bagrichthys
| Bagrichthys | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Siluriformes |
| Family: | Bagridae |
| Genus: |
Bagrichthys Bleeker, 1857 |
| Synonyms | |
|
Pseudobagrichthys |
|
Pseudobagrichthys
Bleeker, 1862
Bagrichthys is a genus of bagrid catfishes.
This genus is most closely related to the genus Bagroides. In turn, these two genera are most closely related to Leiocassis. The genus can be split into two lineages. B. hypselopterus, B. macracanthus, B. majusculus, and B. vaillantii have long dorsal fins with 18 or more serrations in adults, while B. macropterus, B. micranodus, and B. obscurus have short dorsal fins with 15 or fewer serrations in adults. The first lineage is more derived, while the second lineage is more basal.
This genus currently contains seven described species:
Members of this genus are found in Southeast Asia.
Bagrichthys catfishes are highly specialized. Fish of this genus are characterised by their elongate and laterally compressed caudal peduncle, the dorsally-directed serrations on the posterior edge of the dorsal fin spine, gill membranes united at the isthmus, and a long adipose fin without a free posterior margin. These fish can grow between about 20–40 centimetres (8–16 in) in length. The coloration of Bagrichthys species varies from tan to black; however, coloration can vary between individuals based on environmental conditions. These species have a small narrow mouth, moderately elongate convoluted intestines, and greatly reduced oral dentition.
Many of the Bagrichthys species appear rather similar. B. obscurus and B. majusculus were both identified after it was recognized that they were different species from B. macropterus and B. macracanthus, respectively, which these two species had previously been misidentified as.
The male can be distinguished from the female. The male possesses a genital papilla just before the anal fin, while the female does not. Also, in B. majusculus, B. obscurus, and B. vaillantii the nasal and maxillary barbels of males are more than twice as long as barbels of females; this may hold true for the whole genus.
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