Aquatic oligochaetes (Annelida: Clitellata) of the Czech Republic: check-list, new records, and ecological remarks Author Schenková, Jana Author Pařil, Petr Author Petřivalská, Karla Author Bojková, Jindřiška text Zootaxa 2010 2676 29 44 journal article 10.5281/zenodo.199216 42053b6e-a32d-4d91-9031-852d83b81b5f 1175-5326 199216 Aulodrilus limnobius Bretscher, 1899 Records. Gránický Brook, Znojmo, 48°51'60"N / 16°01'33"E , lgt. PP, det. PP. (2005); Drietomice River, Starý Hrozenkov, 48°57'13"N / 17°52'29"E , lgt. PP, det. PP (2005); Trusovický Brook, Jívová, 49°42'27"N / 17°21'40"E , lgt. KB, det. PP; Olešná River, Zvole, 49°29'26"N / 16°09'44"E , lgt. KB, det. PP (2002); Nectava River, Březinky, 49°39'24"N / 16°46'52"E , lgt. KB, det. PP (2002); Okluky River, Uherský Ostroh, 48°59'38"N / 17°24'07"E , lgt. H, det. PP (2002); Farský Brook, Trhové Sviny, 48°50'24"N / 14°37'55"E , lgt. JZ, det. PP (2002); all specimens were immature. Characteristics of sites. All records were from small and middle-sized brooks (3rd and 4th Strahler order, river width up to 5 m ) with a bottom substrate dominated by sand, gravel, and stones. Most of these highland stretches had a natural morphology (with buffer strips) and extensively used (cropland, grassland), partially forested catchments. The brooks have good water quality (from oligo- to beta-mesosaprobity), with one exception of lowland stream (Okluky River, alpha-mesosaprobity). Ecology. Being a detritophagous species, A. limnobius occurs from hyporhithral to potamal, and also has been collected from standing water areas including deeper, profundal habitats ( Hörner et al. 2002 ; Šporka 2003 ; Alves et al. 2008 ). It can tolerate intermediate eutrophication ( Verdonschot 2006 ) and organic pollution from oligo- to alpha-mesosaprobity ( Hörner et al. 2002 ). Microhabitat preferences of fine substrates rich in organic material (pelal, psamal and argylal) have been reported ( Šporka 2003 ; Alves et al. 2008 ). Among oligochaetes, A. limnobius belongs to K-strategists ( Šporka 2003 ) with one reproductive cycle per year, mostly realised by asexual reproduction (architomy); mature specimens are rare (Timm & Veldhijzen van Zanten 2002 ). Worms burrow in sediment, where they build reinforced tubes of silt (Timm & Veldhijzen van Zanten 2002 ). Morphology. Aulodrilus limnobius has characteristic bifid crotchets, with up to 10 chaetae per bundle (all with shorter upper teeth, and occasionally with wing-like dilations of the distal ends of the chaetae in posterior segments), and an unsegmented tail, serving as a respiratory organ—typical for this genus. It can be distinguished from its congeners known to occur in the Czech Republic— A. pigueti , A japonicus , and A. pluriseta —by a lack of hair chaetae (Timm & Veldhijzen van Zanten 2002 ; van den Hoek & Verdonschot 2005 ). Distribution. This cosmopolitan species has been recorded in most of European countries, absent only in Austria , the UK , Croatia , Denmark , Greece , Slovenia , and Portugal ( Timm & Giani 2004 ). According to Fauna Europaea ( Timm & Giani 2004 ), the species was found also in the Czech Republic , but unfortunately, the source of this data is not available.