Pethia

Shangningam, Bungdon, Kosygin, Laishram & Chowdhury, Basudhara Roy, 2019, Pethia arunachalensis, a new species of small barb (Teleostei: Cyprinidae) from Arunachal Pradesh, India, Records of the Zoological Survey of India 119 (4) : -

Key to the species of the genus Pethia occurring in the Ganga-Brahmaputra drainage

1.

Lateral line complete………………………………. P.guganio

- Lateral line incomplete…………………………..……..............…2

2.

Body with a humeral spot……………………….…….. P.ticto

- Body without humeral spot…………………………….............…3

3.

Caudal peduncle with two black blotches………... P.shalynius - Caudal peduncle with one blotch/spot/ band………............…….4

4. Scales around the caudal peduncle 8…..………………………5

- Scales around the caudal peduncle 9–12………….........................6

5. Transverse scale rows between the lateral line and pelvic-fin origin 2; longer snout length 8.9–11.8 % SL….....….... P.canius

- Transverse scale rows between the lateral line and pelvic-fin origin 2½; shorter snout length 6.1–8.4 % SL…….....… .................................................................................................... P. gelius

6. Scales along the lateral line series 20–21………....... P. phutunio

- Scales along the lateral line series 22–26………..............................7

7. Presence of a band around the caudal peduncle; a black spot under dorsal-fin origin and above anal-fin origin….... P.aurea

- Presence of a black caudal spot; no black spot beneath dorsal- and above anal-fin origin……......................................................………8

8. Lateral line series scales 24–26; transverse scale rows from dorsal-fin origin to lateral line 5½; branched pectoral-fin rays 12-12…………………………................................ P. conchonius

- Lateral line series scales 22–23; transverse scale rows from dorsal-fin origin to lateral line 4½; branched pectoral-fin rays 10-11……………..................................................... P. arunachalensi s