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Title: A new species of Microdalyellia (Rhabditophora : Rhabdocoela : Dalyelliidae) from temporal freshwater rock pools in Utah, USA
Authors: WILLEMS, Wim 
Jocque, Merlijn
Brendonck, Luc
Issue Date: 2007
Source: ANNALES ZOOLOGICI, 57(3). p. 371-376
Abstract: A new species of Microdalyellia Gieysztor, 1938 is described from a temporal freshwater pool in Utah, USA. This new species is characterized by the detailed structure of the stylet, which is of the Microdalyellia-type and consists of a crossbeam that carries two proximal shafts, two distal branches each carrying 5-7 hollow spines, and a median process in between both these spiniferous branches. The most remarkable feature is the presence of a second connection (or crossbeam) between both shafts, giving the proximal part of the stylet the appearance of a plate with a large window. The species' affinities within the taxon Dalyelliidae Graff, 1905 are discussed. Following the discussion, Gieysztoria rastafariae Therriault and Kolasa, 1999 is transferred to the taxon Microdalyellia, because of the presence of a Microdalyellia-type stylet, which closely resembles that of the newly described species.
Notes: Dept Invertebrate Zool, Swedish Museum Nat Hist, S-10405 Stockholm, Sweden. Catholic Univ Louvain, Aquat Ecol Lab, B-3000 Louvain, Belgium.WILLEMS, W, Hasselt Univ, Ctr Environm Sci, Res Grp Biodiversity Phylogeny & Populat Studies, Campus Diepenbeek,Agorlaan,Bldg D, B-3590 Diepenbeek,
Keywords: taxonomy; new taxa; Platyhelminthes; 'Turbellaria'; dalytyphloplanida; Microdalyellia; Gieysztoria; rock pools; North America
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ISSN: 0003-4541
e-ISSN: 1734-1833
ISI #: 000250234200002
Category: A1
Type: Journal Contribution
Validations: ecoom 2008
Appears in Collections:Research publications

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