Friday, December 31, 2021

[Ichthyology • 2021] Barbodes sellifer & B. zakariaismaili • Two New Species of Barbodes (Cypriniformes: Cyprinidae) from the Malay Peninsula and Comments on ‘Cryptic Species’ in the B. binotatus Group

 Barbodes sellifer  
Kottelat & Lim, 2021


 Barbodes sellifer, new species, is described from Singapore, the southern Malay Peninsula and Riau (Sumatra). It is distinguished by having, among others, a large triangular to rectangular blotch between the dorsal fin and the midlateral row of scales (+1). Barbodes zakariaismaili, new species, is described from the Jelai watershed of the Pahang drainage. It is distinguished, among others, by having an elongated blotch on the anterior third of scale rows 0 and +1, and a narrow, faint bar between dorsal-fin origin and scale row +1. The existence of the supposed B. binotatus cryptic species is discussed; it does not satisfy any of the criteria under different concepts and this terminology should not be used. Among others, it is made of diagnosable units, and the morphological disparity among the supposed ‘cryptic’ taxa is not substantially lower than among non-‘cryptic’ relatives. It is simply a taxonomically difficult group. 

Key words. Barbodes, Singapore, Malaysia, cryptic species

Fig. 3. Barbodes sellifer, new species, ZRC 21699, 42.4 mm SL; Malaysia: Terengganu: Sekayu. (Photograph by M. Kottelat).
Fig. 3. Barbodes sellifer, new species, about 60 mm SL; Singapore: Nee Soon swamp forest (type locality). Live specimen, in situ, January 2005, not preserved. (Photograph by Nick Baker).

 Barbodes sellifer, new species 

Diagnosis. Barbodes sellifer, new species, is distinguished from all other species that have been placed in the B. binotatus group by the presence in adults of a large triangular to rectangular blotch extending downwards from in front of and below the base of the dorsal fin in adults (sometimes incomplete or narrower); juveniles have a midlateral row of 3–5 black spots, with the second spot vertically elongated, contacting a small spot below branched dorsal-fin rays 1–2.

 Etymology. Sellifer is a Latin adjective meaning ‘bearing a saddle’ (feminine: sellifera, neuter: selliferum).

The forest stream (a) inhabited by Barbodes sellifer, new species, in the type locality, Nee Soon swamp-forest in Singapore; 
and a view from the surface (b) showing a congregation of many individuals of B. sellifer (with the distinct black subdorsal blotch) with a few Rasbora elegans (with the two black spots on the side).
(Photographs by K. K. P. Lim, March 2005).

Barbodes zakariaismaili, new species 

Diagnosis. Barbodes zakariaismaili, new species, is distinguished from all other species of the B. binotatus group by its unique colour pattern in adults, including a faint longitudinally elongate blackish midlateral mark from the upper extremity of the gill opening to below the dorsal-fin origin; a black spot below the anterior part of the dorsal-fin base, extending downwards to the midlateral row as a narrow triangular mark; and a blackish spot at the end of the caudal peduncle. Other characters useful for identification, but not unique to the species, are: slender body (depth 2.9–3.1 times in SL); interobital area convex; eye not flush with dorsal profile, relatively small (4–5 times in head length, 1.5–1.9 times in interorbital distance); juveniles with a conspicuous reticulate pattern made of black pigments on scale pockets.

 Etymology. The species is named for Mohd. Zakaria-Ismail in appreciation for his work on the fish fauna of Malaysia. A noun in the genitive, indeclinable.

Maurice Kottelat and Kelvin K. P. Lim. 2021. Two New Species of Barbodes from the Malay Peninsula and Comments on ‘Cryptic Species’ in the B. binotatus Group (Teleostei: Cyprinidae).  RAFFLES BULLETIN OF ZOOLOGY. 69; 522–540.