Carasobarbus doadrioi, Jouladeh-Roudbar & Kaya & Vatandoust & Ghanavi, 2024

Carasobarbus doadrioi , new species

( Figs. 5 View Fig , 6 View Fig , 7 View Fig and 8 View Fig ).

Holotype. BIAUBM 6-H , 75.3 mm SL; Iran: Chaharmahal and Bakhtiari prov., Khersan River at Atishgah, Karun River drainage, Persian Gulf Basin , 31.24358, 50.99075 GoogleMaps .

Paratypes. AJRPC 17-P , 7, 69.3– 45.2 mm SL; data same as holotype GoogleMaps .

New material used in molecular genetic analysis. AJRPC-DNA 198A ( COI: PP 515175, Cyt b: PP 548209), 198B ( COI: PP 515176, Cyt b: PP 548210), 198C ( COI: PP 515177, Cyt b: PP 548211), same data as holotype; AJRPC-DNA 1715 ( COI: PP 515188, Cyt b: not sequenced), Iran: Lorestan prov., Sezar River at Absardeh, Karun River drainage, Persian Gulf Basin, 33.20562, 48.88326.

Diagnosis

Carasobarbus doadrioi is distinguished from C. sublimus , C. hajhosseini sp. n. and C. kosswigi by having more scales on lateral line (40–44 vs. 27–37). Carasobarbus doadrioi sp. n. is similar to C. saadatii sp. n. and is distinguished by having a prominent black blotch on end of caudal peduncle in specimens <85 mm SL (vs. no black blotch), longer head length (22–25 vs. 19–20% SL), shorter dorsal fin height (19–26 vs. 26–30% SL) and shorter distance between base of pelvic and anal fins (24–25 v. 26 –28% SL). It is distinguished from C. luteus by having two pair of barbels (vs. one pair), well-developed median lobe on the lower lip (vs. without median lobe) and more scales on the lateral line (40–44 vs. 25–30) ( Table 5 View Table 5 ).

Description

See Figs. 5 View Fig , 6 View Fig , 7 View Fig and 8 View Fig for general appearance, Table 6 View Table 6 for morphometric data. Body moderately high, laterally compressed, without nuchal hump. The greatest body depth in front or at dorsal-fin origin. Ventral head profile straight, dorsal head profile with a slight to pronounced hump near nostrils. Head short and narrow. Maximum body depth larger than head length. Triangular axillary scale at pelvic-fin base present. Pelvic-fin origin below vertical of last unbranched or first branched dorsal-fin ray. Caudal fin forked. Pectoral fin reaching approximately 70–90% of distance between pectoral- to pelvic-fin origin. Pelvic fin not reaching anus. Eye large, markedly smaller than snout. Mouth inferior, lips thick and fleshy with a well-developed median lob. Two pairs of barbels, rostral barbel reaches to anterior part of eye and maxillary barbel reaching to posterior part of eye.

Dorsal fin with 4 (n = 8) unbranched rays and 11½ (n = 8) branched rays, outer margin deeply concave. Anal fin with 3 (n = 8) unbranched and 6½ (n= 8) branched rays, outer margin straight. Pectoral fin with 14 (n = 5), 15 (n = 3) rays. Pelvic fin with 7 (n = 1)–8 (n = 7) rays. Lateral line with 40 (n = 3), 41 (n = 2), 42 (n = 1), 43 (n = 1), 44 (n = 1) scales. Scale rows between dorsal-fin origin and lateral line 7 (n = 8). Scale rows between anal-fin origin and lateral line 6 (n = 11).

Coloration

In life: Body silverish or cream-white. Back darker than belly. Series of scales over the lateral line outlined by dark pigmentation, evident in anterior and fade in posterior. Fins with scattered dark melanophores on rays and membranes. In formalin: Cream-brown, back darker than belly. Series of scales over the lateral line with dark anterior pigmentation, fading posteriorly. Fins with scattered dark melanophores on rays and membranes.

Distribution

Known from the lower Dez and Karun drainages.

Etymology

This species name derives from the name of the Spanish ichthyologist Ignacio Doadrio Villarejo, in honour of his invaluable contribution to the study of the fishes of the world.

Habitat

Carasobarbus doadrioi sp. n. is found in the deep, slow current of large rivers ( Fig. 9 View Fig ). It typically favours areas with abundant vegetation with rocky substrates during the summer. Generally, the species is most abundant in the middle and lower Karun drainage. Luciobarbus esocinus Heckel, 1843 , Garra rufa (Heckel, 1843) , Acanthobrama marmid Heckel, 1843 , Alburnus sellal Heckel, 1843 , Chondrostoma regium (Heckel, 1843) , Squalius berak Heckel, 1843 , Oxynoemacheilus euphraticus , Glyptothorax cous (Linnaeus 1766) and G. alidaei Mousavi-Sabet, Eagderi, Vatandoust & Freyhof, 2021 were found coexisting with the new species.