Orthocladius rubicundus (Meigen, 1818)

Bruno Rossaro & 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, Zootaxa 7, pp. 1-20 : 12-13

Orthocladius rubicundus (Meigen, 1818)

O. rubicundus (Meigen, 1818)

O. saxicola Kieffer, 1911 ( Langton & Cranston 1991)

Orthocladius curtiseta Saether, 1973 ( Langton & Cranston 1991)

DESCRIPTION. See Thienemann (1944:598, sub saxicola ), Langton & Cranston (1991, Fig. 2 d, 4i). Thoracic horn 250­280 m long. Pedes spurii B very developed. Median point band of T III­VI generally transverse, that is well separated from posterior band, sometimes joined to it laterally or medially, but usually distinct. Armament of tergites very variable, e.g. TIII usually has a narrow irregular transverse median band, but occasionally the points cover all the tergite except for bare anterior and postero­median areas. TII­V normally with a postero­lateral patch of rings (=granules) extending the hook row of TII and the apical bands of TIII­VI to the tergite margin. Ventrally on caudal margin of SI­VII (rarely reduced to SII­III), another patch of granules is present, well developed on S III­VI, in dark individuals within a brown­black coloured transverse band. Granulation may be complete on SI­V across the sternite, or medially broken. In some specimens granules are very reduced to a small ventral, lateral field. Pedes spurii A present on S IV­VI ("bei saxicola auf VII ­VIII fehlend", Potthast, 1915: 268, sub saxicola ). Apical taeniate extensions of cuticle resemble broken setae “die wie abgebrochene Borsten aussehen“ ( Thienemann 1944: 598). Anal macrosetae 140­190 m long, anal lobes 260­320 m long, 315­350 m wide.

MATERIAL EXAMINATED: ITALY: PIEMONTE: Acqualba stream, 15/5/1976, 1 Pex; Po river, Trino Vercellese, 9/5/1968, 1 Pex; Agogna river, Novara, 31/3/1987, 1 Pex; Briga e Gozzano, 12/6/1993, 1 Pex; Pallanza, 15/11/1978, 1 Pex, spring near Cameri, Novara, 10/4/1995, LOMBARDIA: Po river, Pieve Porto Morone, 3/5/1980, 1 Pex; Varese lake, Cassinetta, 14/5/1996, 1 Pex; Pioverna stream, 19/2/1976, 1 Pex; Gallavesa stream, 12/8/1976, 1 Pex; Brembo river, 23/5/1980, 2 Pex; 23/4/2000, 1 Pex, 12/6/2000, 1 Pex; Serio river, Ricengo, 24/5/1999, 1 Pex; 28/6/1999, 1 Pex, 27/9/1999, 1 Pex, 23/1/2000, 1 Pex, 18/2/2000, 1 Pex, 23/3/2000, 1 Pex; 1 Pex; Lambro river, Asso, 27/12/1977, 1 Pex;, 28/6/1978, 1 Pex; p.te Lambro, 12/10/1995, 1 Pex; 9/11/1995, 1 Pex; Ticino river, Oleggio, 2/2/1995, 1 Pex; 16/2/1995, 1 Pex; Boffalora, 11/11/1978,1 Pex, 21/11/1978, 1 Pex, 1/4/1979, 1 Pex, 11/1/1981, 1 Pex, 29/3/1985, 1 Pex, 1/5/1985, 1 Pex, 11/2/1993, 1 Pex, 4/3/1993, 1 Pex; Turbigo, 14/1/1978, 1 Pex; 14/1/1979, 1 Pex; Chiese river, 14/4/ 1994, 1 Pex; Noce river, Stavel, 11/9/1990, 1 Pex; Bacchiglione river, 11/7/1977, 1 Pex. LIGURIA: Danè stream, Savona, 25/11/1998, 1 Pex; Trexenda stream, Savona, 19/9/1998, 1 Pex. EMILIA ROMAGNA: Po river, Corso (PC), 10/3/1975,1 Pex, 18/1/1976, 1 Pex, 6/ 2/1976, 1 Pex, 9/2/1976, 1 Pex, 27/3/1976, 1 Pex; Nure stream, 29/2/1980, 1 Pex; Tributary of Taro river, Bedonia, 15/5/2001, 1 Pex; Bidente stream, 27/3/1979, 1 Pex. MARCHE: Potenza river, S. Severino, 8/3/1986, 1 Pex; Aso stream, 28/3/1979, 1 Pex. ABRUZZO: Sangro river, Pescasseroli, 21/5/1978, 1 Pex; Scontrone, 1/11/1987,1 Pex, 11/11/1988, 1 Pex. LAZIO: Mignone stream, 26/2/1981, 1 Pex.

Figures

FIGURE 2. 2.3 = O. ticinoi: taeniate extensions of cuticle at the tip of anal lobes; 2.4 = O. obumbratus: taeniate extensions of cuticle at the tip of anal lobes; 2.5 = O. marchetti: anal lobes without taeniate extensions of cuticle