One new species and records of Ichthydium Ehrenberg, 1830 (Gastrotricha: Chaetonotida) from Sweden with a key to the genus Author Kånneby, Tobias Author Todaro, Antonio Author Jondelius, Ulf text Zootaxa 2009 2278 26 46 journal article 10.5281/zenodo.191157 3709de53-c30a-4ec4-9676-30edc0511523 1175-5326 191157 Ichthydium squamigerum Balsamo & Fregni, 1995 ( Figures 8E–G ; Table 3 ) Localities: Trösvattnet, Västmanland, Sweden ( 59º33.211’N ; 14º29.232’E ); Lake Siljan, Dalarna, Sweden ( 60º53.039’N ; 15º06.467’E ); Stora Skuggan, Norra Djurgården, Stockholm, Sweden ( 59º22.068’N ; 18º04.152’E ). Material: 7 specimens , 3 measured. TABLE 2. Morphometric data (µm) for Ichthydium diacanthum (n=1). For comparison morphometrics from Balsamo & Todaro (1995) are included. L=Length, W=Width; Na, Not available. Character Specimen 1 Balsamo & Todaro (1995) Total body L 125 111–143 Head W 30 33–34 Neck W 25 Na Body W 35 Na Furca base W ~15 Na Furca L 18–19 15–22 Adhesive tube L 10 Na Pharynx L 32 17–33 Mouth ø Na Na Furca spine L ~10 8.9–13.5 Anterior sensory bristle L ~20 Na Posterior sensory bristle L ~22 Na Remarks: The specimens of I. squamigerum agree well with the morphometric data provided by Balsamo & Fregni (1995) . The distribution and shape of the rounded keeled scales at the base of the furca as well as the subrectangular ventral terminal scales also agree with the original description. A peculiar difference between the Swedish and the Italian specimens is that the former lack the bi-keeled scales anchoring the posterior sensory bristles. The bristles originate from papillae instead of scales. Fregni et al . (1998) found I. squamigerum exclusively in freshwater sand. Six of the Swedish specimens were found at a sandy beach at lake Siljan and one specimen in a very small sandy patch at lake Trösvattnet. The findings of I. squamigerum in Sweden are the first records outside Italy where the species was described. PhIJ at U28; ASB at U23; PSB at U78. Associated gastrotrich fauna: Chaetonotus benacensis Balsamo & Fregni, 1995 , C. hystrix Metschnikoff, 1865 , C. mutinensis Balsamo, 1978 , Lepidodermella squamata and Polymerurus rhomboides ( Stokes, 1887 ) . TABLE 3. Morphometric data (µm) for Ichthydium squamigerum (n=3). For comparison morphometrics from Balsamo & Fregni (1995) are included. L=Length, W=Width; Na, Not available. Character Specimen