The species of the genus Diamesa (Diptera, Chironomidae) known to occur in Italian Alps and Apennines Author Montagna, Matteo Author Urbanelli, Sandra Author Rossaro, Bruno text Zootaxa 2016 4193 2 317 331 journal article 10.11646/zootaxa.4193.2.7 4a1140ea-fe86-4b33-9ee7-2f933c97a856 1175-5326 166939 A1A56E2F-3A9A-4A07-B3BB-EE50B669FB50 Diamesa martae Kownacki & Kownacka, 1980 ( Fig. 4 A , B) Some additional information to the original description are here given (the measurements given in the original description are in parenthesis). Adult male: body length 4.7 (6.5 mm), wing length 3.62 (4.4 mm), general color of the body dark brown. FIGURE 3. A, Diamesa wuelkeri Serra-Tosio , male genitalia; B, dorso-lateral and ventro-medial lobes of inferior volsella; C, Diamesa longipes Goetghebuer , male genitalia; D I, sternapodeme, D II, anal point, D III, gonostylus. Antenna with 13 flagellomeres, non-plumose; each flagellomere with very short setae (160 µm); pedicel spherical, on its lateral side the group of 4 setae described by Kownacki & Kownacka (1980) is not visible. Eyes bare. Flagellomeres length-width ratios: (120:52, 40:40, 48:40, 40:32, 40:32, 36:28, 36:24, 40:28, 48:28, 44:28, 52:24, 52:24, 616:40), pedicel (80:140). AR (1.04). Maxillary palp four-segmented; the length-width ratio of each segment in µm: 86.6:58, 129:52, 158:43, 188:40 (72:60, 200:60, 172:40, 220:40). Legs: see Table 2. TABLE 2. Lengths (in µm) and proportions of leg segments. (Legends: KP I,II,III: measurements given in the original description, IP I,II,III: measurements of the specimen from the Italian Alps; fe, femur; ti, tibia; ta1–5, tarsomeres 1–5; LR, leg ratio; BV, combined length of femur, tibia, and ta1 divided by combined length of tarsomeres 2–5; SV, ratio of femur plus tibia to ta1.)

fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV
KP I	2380	2513	1530	714	459	170	209	0.60	4.16	3.20
KP II	2635	2295	1037	554	340	170	204	0.45	4.71	4.75
KP III	2771	2686	1530	782	425	170	204	0.57	4.42	3.57
IP I	1844	1965	1230	630	370	112	148	0.63	4.00	3.10
IP II	1924	1582	927	457	275	100	130	0.59	4.61	3.78
IP III	2059	2167	1631	940	366	102	134	0.75	3.80	2.59

Hypopygium ( Fig. 4 A , B; Fig. 3 in Kownacki & Kownacka 1980 ): tergite IX divided into two parts by a less chitinized surface passing into a short, poorly chitinized anal point, two groups of setae situated on brighter areas on the tergite symmetrically to the body axis; gonocoxite with two fairly characteristic appendages: superior volsella rounded, not clearly differentiated, inferior volsella with two lobes, an anterior dorsal lobe digitiform, well separated from gonocoxite, projecting medially, and a posterior ventral lobe elongated, adhering to gonocoxite; outer surface of the gonocoxite covered with longer hairs; two strong setae on the postero-median margin of gonocoxite; gonostylus black-brown, slender, somewhat swollen in median part, ending with apical spine, covered wholly with sensilla, with short setae on bright areas. Transverse sternapodeme with a shape intermediate between the typical arc (as in many Diamesa species, e.g. D. zernyi ) and the triangular shape characterizing species of the steinboecki group; the hook-shaped aedeagal lobe is characteristic. Adult female, pupa, larva: unknown. Material collected: One male from Amola glacier stream, 2474 m a.s.l., 14VIII2014 . Systematic remarks. According to Kownacki & Kownacka (1980) the determination of a group membership of this species is difficult. It belongs most probably to the Diamesa latitarsis group. The bare eyes and the structure of the hypopygium provide arguments for including it here. The gonocoxite inferior volsella is composed by two lobes, as in all other species of latitarsis group, but the shape of these lobes is characteristic in this species. The presence of two strong setae on the postero-median margin of gonocoxite and the shape of gonostylus also suggests the inclusion in the latitarsis group, whereas the sternapodeme resembles the one observed in D. steinboecki .