Aqua, International Journal of Ichthyology Aqua, International Journal of Ichthyology
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aqua International Journal of Ichthyology Vol. 16 (3), 15 July 2010 Aquapress ISSN 0945-9871 aqua - International Journal of Ichthyology Managing Editor: Scope aqua is an international journal which publishes original Heiko Bleher scientific articles in the fields of systematics, taxonomy, Via G. Falcone 11, bio geography, ethology, ecology, and general biology of 27010 Miradolo Terme (PV), Italy fishes. Papers on freshwater, brackish, and marine fishes Tel.: +39-0382-754707 – Fax: +39-0382-754129 will be considered. aqua is fully refereed and aims at pub- E-mail: [email protected] lishing manuscripts within 2-4 months of acceptance. In www.aqua-aquapress.com view of the importance of color patterns in species identi - fication and animal ethology, authors are encouraged to submit color illustrations in addition to descriptions of coloration. 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I-27010 Miradolo Terme (Pavia), Italy www.aqua-aquapress.com Richard Winterbottom Printer: Global Print s.r.l. – Gorgonzola (MI) – Italy Centre of Biodiversity & Conservation Biology, Copyediting and layout: Rossella Bulla Royal Ontario Museum, Toronto, Canada © 2010 aqua, International Journal of Ichthyology aqua, International Journal of Ichthyology A new species of Haplochromis, Haplochromis katonga n. sp. (Perciformes: Cichlidae) from the Katonga River, Uganda Erwin Schraml1 and Herbert Tichy2 1) Haferstrasse 18c, D-86179 Augsburg, Germany. E-mail: [email protected] 2) Max-Planck-Institut für Biologie, D72076 Tübingen, Germany. E-mail: [email protected] Received: 04 February 2010 – Accepted: 29 March 2010 Abstract LS, collectés dans la rivière Katonga, Uganda. Elle diffère A new species of the genus Haplochromis, H. katonga, is des autres espèces du genre par sa taille relativement described from nine specimen, ranging from 37.1 to 68.7 réduite, la combinaison de caractéristiques (comme l’œil mm SL, collected from the Katonga River, Uganda. It dif- relativement grand, un nombre réduit d’écailles sur la linge fers from other species of the genus by its relatively small latérale centrale (<31 vs. >30), une hauteur de corps moins size, the combination of morphological characters (such as prononcée que pour les autres espèces fluviatiles (32,7 vs. the relatively large eye, a low number of scales in the mid- 35-40 % LS chez Astatotilapia), et par sa coloration (les lateral line (<31 vs. >30), a smaller body depth than in mâles: bleuâtre à gris-brun foncé sur le dos, flancs other fluviatile species (32.7 vs. 35-40 % SL in Astatoti- verdâtres, parties ventrales jaunâtres, avec des zones lapia), and its coloration (in males: bluish to dark grey- rougeâtres dans les nageoires impaires). C’est la seule brown on dorsum, flanks greenish, ventral parts yellowish, espèce d’Haplochromis connue de la rivière Katonga qui with reddish areas in unpaired fins). It is the only known relie les bassins du lac Victoria et du lac George. Elle mon- Haplochromis species from the Katonga River, which con- tre des affinités avec les genres Astatotilapia et Ente- nects the Lake Victoria and Lake George basins. It shows rochromis (comme définis par Greenwood 1979, 1980). affinities to the genera Astatotilapia and Enterochromis (as defined by Greenwood 1979, 1980). Sommario Una nuova specie del genere Haplochromis, H. katonga, è Zusammenfassung descritta sulla base di nove esemplari, di dimenzioni variabili Eine neue Art der Gattung Haplochromis: H. katonga, wird dai 37.1 ai 68.7 mm SL, raccolti nel fiume Katonga, nach neun Exemplaren mit 37,1 bis 68,7 mm SL Uganda. Essa differisce dalle altre specie del genere per la sue beschrieben, die im Katonga-Fluss in Uganda gefangen wur- dimensioni relativamenente ridotte, per una combinazione den. Von den anderen Arten der Gattung unterscheiden sie di caratteri morfologici, quali l’occhio relativamente grande, sich durch relativ geringe Größe, die Kombination be - un numero ridotto di scaglie sulla linea laterale mediana stimmter morphologischer Merkmale (beispielsweise ein rel- (<31 vs. >30), una minore altezza del corpo rispetto alle altre ativ großes Auge, eine geringe Zahl von Schuppen auf der specie fluviatili (32.7 vs. 35-40 % SL in Astatotilapia) e per seitlichen Mittellinie (<31 vs. >30), eine geringere Körper- la colorazione dei maschi che appare da bluastra a grigio- tiefe als bei anderen flusslebenden Arten (32,7 vs. 35-40 % marrone scuro sul dorso, con fianchi verdastri e parti ven- der Standardlänge bei Astatotilapia) sowie durch die Farbge- trali giallastre e con aree rossastre sulle pinne impari. è la sola bung (bei Männchen: bläulich bis dunkel graubraun am specie di Haplochromis rinvenuta nel Katonga, un fiume che Rücken, grünlich die Flanken, im Bauchbereich gelblich, congiunge i bacini del lago Victoria e del lago George. rötliche Bereiche an den unpaaren Flossen). Es handelt sich Mostra somiglianze con i generi Astatotilapia ed Ente- um die bisher einzige Haplochromis-Art vom Katonga-Fluss, rochromis (come definiti da Greenwood 1979, 1980). der den Victoriasee mit dem Georgsee verbindet. Verbindende Merkmale ließen sich zu den Gattungen Asta- INTRODUCTION totilapia und Enterochromis (nach den Definitionen von Greenwood 1979, 1980) feststellen. Describing new Haplochromis species is a difficult undertaking. Genera are poorly defined, phyloge- Résumé netic relationships are poorly known and there are Une nouvelle espèce du genre Haplochromis, H. katonga, hundreds of closely related species, with a very est décrit sur base de neuf spécimens, de 37.1 à 68,7 mm large number of undescribed species. Many of 81 aqua vol. 16 no. 3 - 15 July 2010 A new species of Haplochromis, Haplochromis katonga n. sp. (Perciformes: Cichlidae) from the Katonga River, Uganda them seem to have originated in the recent past, with Haplochromis katonga n. sp. the formation of hybrid swarms partially generating (Figs 1-10; Table I) the species flocks of the Lake Victoria region. Many species are extremely difficult to identify through Holotype: ♂, 68.7 mm SL, ZSM 30362 [8683] autapomorphies other than coloration. Morphologi- (Figs 2, 4), Katonga River at the village of Ka ba go - cal differences between the species are small and le, Uganda, (0°11’53.74”N; 30°53’33.98”E); H. intraspecific variability is relatively high. Nevertheless Tichy & E. Schraml, 26 October 1998. the haplochromines of Lake Victoria and adjacent Paratypes: ZSM 30363 (Figs 3, 4), [8676], ♀, lakes have been regarded as of special interest since 40.0 mm SL; [8677], ♀, 37.1 mm SL; [8678], ♂, Greenwood (1964, 1969, 1981) introduced them as 47.7 mm SL; [8679], ♀, 38.1 mm SL; [8680], ♀, an example of rapid evolution of a species flock. 42.7 mm SL; [8681], ♀, 37.1 mm SL; [8684], ♀, Greenwood (1973) stated that the headwater of the 40.9 mm SL; [8685], ♀, 48.8 mm SL; 25/26 river Katonga, which connects Lake Victoria with October 1998, same data as for the holotype. Lake George, is apparently impenetrable to all but Diagnosis: A relatively small species with a mod- air-breathing fishes. Today the Katonga and Mpanga erate body depth, laterally compressed, with gener- rivers occupy the riverbed of the ancient Katonga alised body shape (for genus and family), a termi- which originally drained the Lake Victoria area west- nal, slightly acute, symmetric mouth, lower jaw wards (Said 1993). The drifting apart of the Nubian slightly protruding, and relatively large eyes (33.8 and Somalian tectonic plates is most probably % HL vs (i.