NOTES AND NEWS

A NEW SPECIES OF COROPHIID FOR THE TURKISH FAUNA: CHELICOROPHIUM MAEOTICUM (SOWINSKY, 1898) (AMPHIPODA)

BY

MURAT ÖZBEK, M. RUSEN USTAOGLU and SULEYMAN BALIK Department of Hydrobiology, Faculty of Fisheries, Ege University, TR-35100 Bornova-Izmir,˙ Turkey

Corophium Latreille, 1804 is a world-wide marine genus with the propensity to enter non-marine habitats, not only because some species are euryhaline but also because some have a low level of biocompetition in the entirely marine biome (Barnard & Barnard, 1983). The genus is represented world-wide by a total of 58 species, 40 of which occur in the sea, while the remaining ones occur in fresh water, mainly in the Ponto-Caspian area (Barnard & Barnard, 1983). Among these, 17 species are found in and around the Mediterranean basin (Ruffo, 1982). In their recent revision of the Corophiidae, Bousfield & Hoover (1997) divided the family into two subfamilies, Corophiinae and Siphonoecetinae, and described many new genera. One of these is Chelicorophium, which is the only corophiid genus found in the Ponto-Caspian area that includes freshwater species. This genus is represented here by eleven species, in addition to Chelicorophium curvispinum (G. O. Sars, 1895) which was designated as the type species of the genus (Bousfield & Hoover, 1997). So far, Chelicorophium maeoticum (Sowinsky, 1898) was reported by Carausu (1943), Carausu et al. (1955), Mordukhai-Boltovskoi (1964), and Grigorovich et al. (2002) from the northern and western parts of the Black Sea, where the salinity levels are lower than that in the south. Eight species of Corophini [Apocorphium acutum (Chevreux, 1908); Che- licorophium curvispinum (G. O. Sars, 1895); Crassicorophium bonellii (H. Milne Edwards, 1830); Corophium orientale Schellenberg, 1928; Medicorophium mini- mum (Schiecke, 1979); Medicorophium rotundirostre (Stephensen, 1915); Mono- corophium acherusicum (Costa, 1851), and Monocorophium insidiosum (Craw- ford, 1937)] were reported from Turkey (Kocatas & Katagan, 1977a, b, 1980; Ustaoglu et al., 1998, 2000; Sari et al., 2001; Sezgin, 2003). Of these, only C. curvispinum and C. orientale were reported from fresh- or brackish-water lakes (Ustaoglu et al., 1998, 2000; Sari et al., 2001). © Koninklijke Brill NV, Leiden, 2004 Crustaceana 77 (8): 1013-1018 Also available online: www.brill.nl 1014 NOTES AND NEWS

Fig. 1. Poyrazlar Lake, the sampling locality, near the souther Black Sea coast of Turkey.

In this study, we investigated the corophiids collected from Poyrazlar Lake (fig. 1.) and present herein Chelicorophium maeoticum (Sowinsky, 1898) for the first time for the Turkish fauna. The following papers were used for the identification of the species: Carausu (1943), Carausu et al. (1955), and Bousfield & Hoover (1997).

Chelicorophium maeoticum (Sowinsky, 1898) (figs. 2-3)

Corophium maeoticum Sowinsky, 1898: 362; 1904: 389-390; Martynov, 1924: 44-47; Miloslavs- kaia, 1939: 147-148; Carausu, 1943: 234-237; Carausu et al., 1955: 376-379; Barnard & Barnard, 1983: 705; Grigorovich et al., 2002: 1199. Chelicorophium maeoticum — Bousfield & Hoover, 1997: 88.

◦  ◦  Material examined. — Poyrazlar Lake (40 50 N30 27 E) near province of Sakarya, northern Anatolia (fig. 1); 3 ,6ovig., 24.vi.2003, from sandy-muddy bottom with well developed aquatic macrophytes in littoral zone; total length 2.3-3.7 mm.

Description. — Antenna 1 with 10-segmented flagellum (fig. 2a, a). Peduncle segments setose along ventral and dorsolateral margins. Setae on peduncular segments very long and numerous (fig. 2a). A few spines also occur on proximal section of first peduncular segment. Antenna 2 well developed in both sexes and longer than antenna 1; ventrally setose (fig. 2b). Fourth segment robust (length