Orthocladius ruffoi Rossaro & Prato, 1991

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 : 13-14

Orthocladius ruffoi Rossaro & Prato, 1991

Orthocladius ruffoi Rossaro & Prato, 1991

Rheorthocladius sp. A Thienemann, 1944 ( Rossaro & Prato 1991)

Orthocladius Pe 1, Langton, 1984: 149 ( Rossaro & Prato 1991)

DESCRIPTION. See Thienemann (1944: 598), Langton & Cranston (1991, Fig. 1 e, 2b, 4a) and Rossaro & Prato (1991, Fig. 2 , 3). Thoracic horn 250­350 m long. Pedes spurii B absent. Tergites with median points always well separated from posterior ones on TII­VI, sometimes continuous laterally on T II­IV. T II­III with lateral points well reduced in size with respect to median ones. Very long dorsal and ventral setae on segments VII­VIII. Abdominal segment VII with 3 and segment VIII with 5 strong lateral setae. Pedes spurii A present on S IV­VI. Taeniate extensions of cuticle present on anal lobes, in addition anal lobes with a lateral fringe of thin, short setae. Anal macrosetae not hooked at tip, 275­340 m long, anal lobes 300­375 m long and 400­480 m wide.

COMMENTS. The pupal exuviae was described by Thienemann (1944, p. 598) and labelled Rheorthocladius sp. A, and by Langton (1984, p. 149) and labelled Orthocladius (s. str.) Pe 1.

MATERIAL EXAMINED: ITALY: PIEMONTE: Acqualba stream, 7/7/1976, 2 Pex. LOMBARDIA: Lambro river, Asso; 27/12/1977,1 male pupa; a creek, tributary of Oglio river near Vezza, 5/8/1979, 1 Pex. EMILIA ROMAGNA: Po river, Caorso (PC), 19/5/ 1981, 1 Pex. MARCHE: Potenza river, Castel Raimondo, 8/4/1986, 1 Pex. LAZIO: Velino river, 11/3/1990, 1 Pex. ABRUZZO: Sangro river, PNA, st. 4 (Pescasseroli), (SS 84 Km 41), 21/5/1978, 1 Pex; PNA, st. 13 (Profluo, prato Piano), 21/5/1978, 1 Pex; PNA, st.14 (Scontrone), 11/11/1988, 1 Pex; Vera spring, 12/3/1988, 1 Pex; 3/5/1989,1 Pex; 3/6/1989,1 Pex.

Figures

FIGURE 1. Ventral view (sternite) on the left, dorsal view (tergite) on the right. 1.1: O. marchettii: tergite III with anterior, median, posterior and apical point fields; 1.2: O. pedestris: tergite III with anterior, median, posterior and apical point fields

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