Orthocladius obumbratus Johannsen 1905
Creators: name: Rossaro, Bruno
name: Casalegno, Carlotta
Publisher: name: Zenodo
Year: 2001
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Chironomidae
Orthocladius
Orthocladius obumbratus

description: <i>Orthocladius obumbratus</i> Johannsen, 1905 <i>O. obumbratus</i> Johannsen, 1905 <i>O. rhyacobius</i> Kieffer, 1911 (Langton &amp; Cranston 1991) <i>O. rhyacophilus</i> Kieffer, 1911 (Langton &amp; Cranston 1991) <i>O. dispar</i> Goetghebuer, 1942 (Langton &amp; Cranston 1991) <i>O. excavatus</i> Brundin, 1947: 20 (Langton &amp; Cranston 1991) <i>Orthocladius</i> Pe 9 Langton, 1984: 155 (Langton 1991: 190; Langton &amp; Cranston 1991) nec <i>Orthocladius rhyacobius</i> Kieffer, 1911, sensu Langton, 1984: 158 DESCRIPTION. See Potthast (1915: 270­271, sub <i>rhyacobius</i>), Langton <i>&amp;</i> Cranston (1991, Fig. 1 b, 3 c, 4 b). Abdomen about 3.5 m long. Anterior and lateral margin of tergites darker. Frontal warts well developed. Thoracic horn 400­450 mm long, “proximal etwas angeschwollen, distal spitz” (Potthast 1915: 269). Spines stronger in distal part of thoracic horn, more developed than in <i>O. ticinoi</i>. Thorax rough. Points continuous but not much extended over the tergites, the oral and lateral margins free, but a field of very small points of very variable extension, may be present at the antero­lateral corner, in this case there is a sudden drop in size of points. Posterior and apical points on tergites not more developed than the median and anterior ones. <i>TIII</i> with posterior points not extended laterally to apical points. <i>SII­IV</i> with extended fields of grouped points. Lateral setae: 1 on segment <i>I</i>, 3 on segments <i>II­VI</i>, 4 on segments <i>VII</i> and 5 on segment <i>VIII</i>. Anal lobes with apical taeniate extensions of cuticle, having the shape of 2 brown and sturdy chitinised spurs, often fused at base, at least 35 m long (Fig. 2.4), in addition one or more lighter taeniate extensions are often present, sometime appearing as a fringe of small extensions on lateral margin of anal lobes in caudal part. Anal macrosetae, 215­235 m long, hooked at tip, anal lobes 330­370 m long and 400­460 m wide. COMMENTS. The pupal exuviae can be easily separated because the length of taeniate extensions of cuticle at the tips of anal lobes is 30 m in <i>O. ticinoi</i> at most, but more than 35 m, generally much more, in <i>O. obumbratus</i>. The points on the thoracic horn and on the abdominal segments are much more extended on <i>O. obumbratus</i> than on <i>O. ticinoi</i>. MATERIAL EXAMINED: <b>FRANCE</b>: GARONNE river, 10 / 3 / 1997, 1 Pex. <b>ITALY</b>: PIEMONTE: Acqualba spring, 10 / 6 / 1976, 1 Pex; Elvo stream, Sordevolo, (BI), 5 / 5 / 2001, 1 Pex; Maggiore lake, Angera, 13 / 2 / 1996, 1 Pex; Po river, Morano (VC), 16 / 5 / 1981, 1 Pex. LOMBARDIA: Brembo river, S.G.Bianco, 9 / 2 / 2000, 1 Pex, 5 / 4 / 2000, 1 Pex, 16 / 5 / 2000, 1 Pex, 16 / 6 / 2000, 1 Pex, 3 / 7 / 2000, 1 Pex; Serina stream, 25 / 5 / 1999, 1 Pex, 16 / 6 / 1999, 1 Pex; Endine lake, 25 / 2 / 1981, 1 Pex; Serio river, Ricengo, 24 / 5 / 1999, 1 Pex; 31 / 10 / 1999, 1 Pex, 26 / 11 / 1999, 1 Pex, 20 / 12 / 1999, 1 Pex, 23 / 1 / 2000, 1 Pex, 18 / 2 / 2000, 1 Pex, 23 / 3 / 2000, 1 Pex, 15 / 4 / 2000, 1 Pex; spring Ghiglio near Milano, 13 / 2 / 1996, 1 Pex; Lambro river, Asso, 1977, 1 Pex, 26 / 1 / 1978, 1 Pex/Lex, 27 / 12 / 1979, 1 Pex, 9 / 11 / 1995, 1 Pex; P.te Lambro, 12 / 10 / 1995, 1 Pex, 9 / 11 / 1995, 1 Pex, 21 / 3 / 1996, 1 Pex; Olginate lake, 17 / 2 / 1977, 1 Pex, 17 / 2 / 1977, 1 Pex; Ticino river, Oleggio 14 / 1 / 1979, 1 Pex; Boffalora, 1 / 1981, 1 female/Pex/Lex; 4 / 3 / 1993, 1 male pupa. LIGURIA: Danè stream, Quiliano (SV), 11 / 1998, 1 male pupa. EMILIA ROMAGNA: Po river, Corso (PC), 15 / 12 / 1975, 1 Pex, 21 / 3 / 1976, 1 Pex, 12 / 4 / 1977, 1 female /Pex, 10 / 4 / 1979, 1 Pex; Tributary of Taro river, Bedonia, 15 / 5 / 2001, 1 Pex; Bidente stream, 27 / 3 / 1979, 1 Pex. MARCHE: Aso river, 17 / 4 / 1980, 1 Pex. LAZIO: Velino river, 17 / 3 / 1990, 1 male pupa, Mignone stream, 26 / 2 / 1981, 1 male pupa, 26 / 2 / 1985, 1 male pupa. ABRUZZO: Tordino stream, st. 7, valle Teramo, 9 / 4 / 1991, 1 male pupa; Aterno river, Coppito, 11 / 11 / 1989, 1 Pex; 5 / 2 / 1992, 1 male /Pex; Tasso stream, P.N.Abruzzo, 20 / 5 / 1978, 1 Pex; Sangro river, PNA, Scontrone, st. 6, 21 / 5 / 1978, 1 Pex; PNA, Castel di Sangro, st. 14, 11 / 11 / 1988, 1 Pex. SARDEGNA: spring near Siniscola, 7 / 12 / 1985,1 Pex, 2 / 1 / 1986, 1 Pex.
description: Published as part of <i>Bruno Rossaro &amp; Carlotta Casalegno, 2001, 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, pp. 1-20 in Zootaxa 7</i> on pages 9-10, DOI: 10.5281/zenodo.4618447
description: {"references": ["Langton, P. H. &amp; Cranston, P. S. (1991) Pupae in nomenclature and identification: West Palaearctic Orthocladius s. str. (Diptera: Chironomidae) revised. Systematic Entomology, 16, 239 - 252.", "Brundin, L. (1947) Zur Kenntnis der schwedischen Chironomiden. Arkiv fur Zoology, 39, 1 - 95.", "Langton, P. H. (1984) A Key to Pupal Exuviae of British Chironomidae. Privately published by the author. 324 pp.", "Potthast, A. (1915) Uber die Metamorphose der Orthocladius - Gruppe. Ein Beitrag zur Kenntnis der Chironomiden. Archiv fur Hydrobiologie Supplement, 2, 243 - 376."]}