Gammarus lacustris G. O . Sars, 1863

Zamanpoore, Mehrdad, Grabowski, Michal, Poeckl, Manfred & Schiemer, Friedrich, 2011, Taxonomic review of freshwater Gammarus (Crustacea: Amphipoda) from Iran, Zootaxa 3140, pp. 1-14 : 6

Gammarus lacustris G. O. Sars, 1863

Gammarus lacustris G. O. Sars, 1863: 207 ; Stock, Mirzajani, Vonk, Naderi & Kiabi, 1998: 206.

Locus typicus. Selsvand, Vage, Norway (based on the assumption made by Karaman & Pinkster, 1977).

Material examined. Karaman & Pinkster, 1977: 32–34, Fig. 12A–D, drawn upon new material from Loch Loyal, Scotland.

Additional specimens (new material), Ne'ur Lake (38º 02', 48º 36'), Ardebil Province, ( FAIC #?).

Distribution. Distribution of this species in Iran is restricted to the far north west of the country, a very big population in Ne'ur Lake, and several populations in the west Alborz ( Stock et al., 1998; Alizade-Eghtedar & Sari, 2007) ( Fig. 1 ).

Ecological notes. Although inhabiting running waters in some occasions, this species is generally found in stagnant waters and lakes (e.g. mountain and glacier) with temperatures lower than 20ºC (detailed ecological characteristics in Karaman & Pinkster 1977, p. 34).

Taxonomic remarks. Among Iranian gammarids, G. lacustris is most similar to G. pseudosyriacus . However, the latter has an elevated dorsal surface of urosome, compared to not elevated urosome in G. lacustris ( Karaman & Pinkster 1977, Fig. 12H). G. bakhteyaricus shows similarities to G. lacustris , from which it differs with the urosome elevation, slender basis of pereopod 7 and, most important, having 2–3 tiny spines on ventral-distal corner of the first peduncle segment in antenna 1. G. lacustris is also similar to G. lordeganensis in having non-setose pereopods 5–7 and antenna 2. However, there are characters well enough for allowing to recognise these species. These include, in the latter species, the acuminate postero-inferior of epimeral plates 2 and 3, non-plumose setae on outer margin of exopodite in uropod 3, and shorter antennal gland cone.

Figures

FIGURE 1. Distribution map of freshwater Gammarus species in Iran (grey regions indicate high mountainous areas).