. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 48 Ilse Bartsch; The freshwater mite Porolohmannela violácea (Kramer. 1879). Figs Í-S. Porolohmannella violácea, larva, 1, idiosoma, dorsal; 2, idiosoma, ventral; 3, gnathosoma, ventral; 4, gnathosoma, late- ral; 5, leg 1, medial; 6, leg II, medial; 7, leg III, medial; 8, tarsus III, lateral (medial parambulacral seta and claw omitted, dorso- media! fossary seta in broken line), (ep, epimeral pore; Ifs, dorsolateral fossary seta; mfs, dorsomedial fossary seta) Scale
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 48 Ilse Bartsch; The freshwater mite Porolohmannela violácea (Kramer. 1879). Figs Í-S. Porolohmannella violácea, larva, 1, idiosoma, dorsal; 2, idiosoma, ventral; 3, gnathosoma, ventral; 4, gnathosoma, late- ral; 5, leg 1, medial; 6, leg II, medial; 7, leg III, medial; 8, tarsus III, lateral (medial parambulacral seta and claw omitted, dorso- media! fossary seta in broken line), (ep, epimeral pore; Ifs, dorsolateral fossary seta; mfs, dorsomedial fossary seta) Scale = 50 |im. Independent of the position of the genital acetabula. Porolohmaiuiella and Lohmannella proved to differ in a number of other characters, in the number of setae on the epimeral plates and genitoanal plate, the number and arrangement of setae on the palps and gnathosoma, the shape of the pharyngeal plate, the position of the soleni- dion on tarsus II, and absence or presence of a carpite (cf. Bartsch 1989). The state of these characters is expected to be independent of environmental paraineters. Recently, in a small pond near Hainburg, Germany, nu- merous females and juveniles of Powlohmannella vio- lácea were found. The developinent of external charac- ters, from instar to instar, has been studied in several ma- rine species (Bartsch 1998, 2003) but to date in no rep- resentative of a freshwater halacarid genus. The larva, nymphs and female of P. violácea are now described, the character development outlined and compared with ma- rine halacarids. 2. MATERIAL AND METHODS The material studied was collected in June, July and Au- gust 2006 in noithem Germany, north of Hamburg, in a shallow pond adjacent to a helocrene swamp area. The pond is approximately 10x20 m (width x length), on the northern border there are sinall bushes, mainly willows. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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