Description of the pupal exuviae of some species belonging to Orthocladius s. str. van der Wulp, 1874 (Diptera: Chironomidae: Orthocladiinae), with a new key to species of West Palaearctic region Author Bruno Rossaro Author Carlotta Casalegno text Zootaxa 2001 2001-08-31 7 1 20 journal article http://doi.org/10.5281/zenodo.4618447 b8a70227-3f95-4b6c-bab0-423990ebbee0 1175­5326 4618447 B8D6DBE1-9599-4328-A653-6B10532F5C48 Orthocladius ticinoi Rossaro & Prato, 1991 O . ticinoi Rossaro & Prato, 1991 Orthocladius Pe 7 Langton, 1984 : 155 ( Langton 1991 : 190 a tentative synonym) nec O . glabripennis Goetghebuer, 1921 , sensu Rossaro 1991 DESCRIPTION. See Rossaro & Prato ( 1991 , Fig. 17, 18 ) . Colour pale transparent. Frontal warts not developed. Thoracic horn slender at apex, 240­420 m long, with points less developed than in O . obumbratus . Thorax moderately rough. Pedes spurii B developed. On T II only posterior point field present. TIII with posterior points not extended laterally beyond apical points. Points on TIII­VI limited to a central trapezoidal area; there is a sudden drop in point size to antero­lateral points. Posterior points on TIII­VI and apical points on TIII­V more developed than the anterior ones, onT IV ­ VI anterior points more developed than the median ones. SII­IV with more or less extended fields of very small grouped points. Pedes spurii A present on S IV­VII . Lateral setae: 1 on segment I , 3 on segments II­VI , 4 on segment VII and 5 on segment VIII . Anal lobes with small colourless apical taeniate extensions of cuticle, at most 30 m long, with the shape of small colourless teeth (Fig. 2.3), laterally in addition very small apical extensions may be present. Anal macrosetae 225­265 m long, anal lobes 325­420 m long, 350­490 m wide. COMMENTS. The species can be easily separated from O . obumbratus , in which well sclerotized extensions of cuticle at the tips of anal lobes, resembling spurs, are observed. Rossaro ( 1991 ) synonymized O . ticinoi with O . glabripennis (= Orthocladius Pe 5 ), because of the presence of small and colourless teeth ( Langton & Cranston 1991 ), but apical taeniate extensions of cuticle apparently are always absent in O . glabripennis and there is no variation within the species in this respect, O . glabripennis is a lentic species, O . ticinoi is restricted to running waters besides this. The conclusion is that specimens with small colourless apical taeniate extensions of cuticle do not belong to O . glabripennis , but to O . ticinoi , which is a separated species. According to Langton ( 1991 ) description, O . ticinoi be identical with Orthocladius Pe 7 Langton 1984 : 155 . MATERIAL EXAMINED: FRANCE : GARONNE river, 10 / 3 / 1997 , 1 Pex. ITALY : LOMBARDIA: Brembo river, 26 / 2 / 2001 , 1 Pex; Serio river, Ricengo, 18 / 2 / 2001 , 1 Pex; 23 / 3 / 2000 , 1 Pex; Ticino river, Oleggio, 16 / 2 / 1995 , 1 Pex; Boffalora, 11 / 1 / 1981 , 1 Pex, 25 / 1 / 1981 , 1 Pex, 1 / 5 / 1981 , 1 Pex, 11 / 2 / 1993 , 1 Pex; Castelletto, 14 / 2 / 2001 , 9 Pex; 5 / 3 / 2001 , 1 Pex. EMILIA ROMAGNA: Po river, Caorso, 12 / 4 / 1977 , 1 Pex; 13 / 12 / 1983 , 1 Pex; Chiavenna stream, tributary of Po river, 10 / 4 / 1979 , 1 Pex. ABRUZZO: Aterno river, Coppito, 28 / 2 / 1992 , 1 Pex.