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Oreichthys Crenuchoides, a New Cyprinid Fish from West Bengal, India

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Oreichthys Crenuchoides, a New Cyprinid Fish from West Bengal, India 201 Ichthyol. Explor. Freshwaters, Vol. 20, No. 3, pp. 201-211, 11 figs., 2 tabs., September 2009 © 2009 by Verlag Dr. Friedrich Pfeil, München, Germany – ISSN 0936-9902 Oreichthys crenuchoides, a new cyprinid fish from West Bengal, India Frank Schäfer* Oreichthys crenuchoides, new species, from River Jorai, West Bengal, is distinguished from other species of Oreich- thys by black blotch at caudal-fin base, 11-13 rows of pores on cheeks, 17-19 + 2 scales in longitudinal series, 7 scales in transverse series, blunt snout, anal fin without black spot or blotch, males with enlarged dorsal fin. Oreichthys cosuatis and O. parvus are re-diagnosed. Introduction Material and methods Smith (1933) created the genus Oreichthys to ac- Fish were caught using a 10-m net with 2 mm commodate O. parvus from Southern Thailand. meshes; they were killed in ethanol, those se- Oreichthys is characterized by the presence of lected for anatomical studies transferred to 5 % numerous pores on the head, a character known formaldehyde on the day of collection, and later at the time only in the genus Cyclocheilichthys. transferred to 70 % ethanol for storage. Methods Oreichthys is readily distinguished from Cyclo- for measurements follow Kottelat (2001). All cheilichthys by a smooth last simple dorsal-fin ray measurements were made point-to-point with versus strong, serrated in Cyclocheilichthys, devel- dial callipers and recorded to the nearest 0.05 mm. oped as a spine. In 1937 Hora synonymized The last two rays in dorsal and anal fins, articulat- O. parvus with O. cosuatis, considering the genus ing on a single pterygophore, were counted as to be monotypic. Since that time little has been 1 ray. In transverse scale counts, { indicates the published on Oreichthys. In recent years the genus scales on the mid-dorsal and mid-ventral rows. has been mentioned in a number of books and All characters given are taken from both male checklists (e.g., Jayaram, 1981; Talwar & Jhingran, and female specimens. In O. crenuchoides there 1992; Menon, 1999; Kottelat, 2001). During an are small, female-shaped “sneakers” (see Notes ichthyological collection trip in West Bengal, an on behaviour under O. crenuchoides). Where a Oreichthys species was collected in the River Jorai, description and diagnosis of males is given, this a tributary of the River Brahmaputra near the is based only on adult non-sneaker males. In such border with Assam, that represents a distinct cases sex was determined by the external shape species, which is described here. of the dorsal fin and head in mature individuals. The Evolutionary Species Concept is used here; see Mayden (2002) for a discussion and hierarchy * Ober-Ramstädter Str. 30, 64367 Mühltal, Germany. E-mail: [email protected] Ichthyol. Explor. Freshwaters, Vol. 20, No. 3 The whole contribution can be Dieser Beitrag kann als purchased as PDF fi le. PDF-Datei erworben werden. Availability Verfügbarkeit von PDF-Dateien Prinzipiell sind von allen unseren Publikationen PDF- Generally all our publications are available as PDF fi les; Dateien erhältlich. Komplette Publikationen in der Regel full publications as a general rule after the printed version erst nachdem die gedruckte Version vergriffen ist. An- is out of print. 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