Callomyia arnaudi Cumming
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|Callomyia arnaudi Cumming|
Callomyia arnaudi Cumming sp. nov.
Diagnosis. This southwestern Nearctic species is characterized by striking metallic bluish-white colour on the thorax and abdomen, and male terminalia with a broadly lamellate surstylus. The male is similar to the southwestern Nearctic species C. bertae , except for differences in colour and terminalia that are indicated in the key to species. Callomyia arnaudi has similar male terminalia to the western Nearctic species C. gilloglyorum , but the ventral process of the broadly lamellate surstylus is shorter in C. arnaudi , as well as the apical projections and basoventral lobe of the hypandrial process. The female of C. arnaudi is similar to C. velutina , from eastern and western North America, because of its similar thoracic and abdominal colour pattern, but can be distinguished from this species by differences in colour (metallic bluish-white versus silver-blue, and pale orange on tergites 1 and 2 versus yellow on tergites 1−3). The coloured abdominal segment interrupted by a median dorsal dark band is on tergite 4 in C. arnaudi as opposed to tergite 5 in C. velutina . The female abdominal colour pattern of C. arnaudi is also similar to that of C. gilloglyorum with light colouration on tergites 1, 2, 4, 6 and 7, and dark drown to black on tergites 3 and 5. However, the actual abdominal colour between the females of these species differs (pale orange versus silver-grey on tergites 1 and 2, and metallic blusih-white versus silver-grey on tergites 4, 6 and 7).
Description. Male ( Figs 5, 6View FIGURES 4 − 8, 16View FIGURES 15 − 18). Body length 3.35–3.85 mm; wing length 3.3–3.8 mm. Head metallic bluishwhite; mouthparts including palpus brownish-yellow; antenna with scape, pedicel, first flagellomere and arista dark brown. Antenna with first flagellomere short-oval (as in Fig. 41View FIGURES 41 − 44).
Thorax dark brown to black with metallic bluish-white markings on lateral portion of presutural scutum, notopleuron, posterior portion of postsutural scutum, postalar callus, propleuron, mesopleuron, metapleuron, mediotergite and laterotergite; dark portion of presutural scutum silver-grey dusted. Scutum with 6 notopleural setae.
Legs brown with base of tibiae brownish-yellow; coxae metallic bluish-white dusted. Mid tibia with median anterodorsal seta absent, median dorsal seta present (as in Fig. 50View FIGURES 49 − 54); base of hind femur with long thin posteroventral seta (as in Fig. 54View FIGURES 49 − 54). Hind tarsomere 1 long, slightly narrower than apical width of hind tibia, length approximately 3 X width.
Wing hyaline with cell sc faintly yellow. Halter dark brown.
Abdomen dark brown to black with lateral metallic bluish-white markings on tergites 1, 2 and 6; ventrolateral metallic bluish-white markings on tergites 3 and 4; sternites metallic bluish-white dusted, sternite 8 metallic bluishwhite.
Terminalia ( Fig. 56View FIGURES 55 − 58) with epandrium metallic bluish-white; surstylus and hypandrium brown; cercus brownishyellow. Epandrium with short tooth-like ventral lobe, pointed at apex; apical process elongate, pointed at apex. Surstylus broadly lamellate with narrow ventral process; dorsal lobe broad with rounded apex; ventral process moderately long, slightly curved dorsally. Hypandrium with elongate slender apical process; process trifid, with 2 moderately long narrow apical projections and short narrow basoventral lobe. Postgonite very long and narrow, tapered towards apex. Phallus sharply hooked at apex. Cercus short.
Female ( Figs 25View FIGURES 25 − 28, 33View FIGURES 33 − 36). Body length 3.0– 3.2 mm; wing length 3.0– 3.3 mm. Head metallic bluish-white with dorsolateral portion of occiput bordering vertex reddish-brown; mouthparts brownish-yellow with palpus pale yellow; antenna with scape, pedicel, first flagellomere and arista brown to dark brown. Antenna with first flagellomere short-oval (as in Fig. 43View FIGURES 41 − 44).
Thorax brown and silver-grey dusted, with metallic bluish-white markings on postpronotal lobe, lateral portion of presutural scutum, notopleuron, posterior portion of postsutural scutum, postalar callus, propleuron, mesopleuron, metapleuron, mediotergite and laterotergite; scutellum dark brown to black. Scutum with 2 presutural intra-alar setae.
Legs brown with trochanters, base and apex of femora, and base of tibiae brownish-yellow; coxae metallic bluish-white dusted. Mid tibia with median dorsal seta absent.
Wing hyaline. Halter pale orange.
Abdomen dark brown to black with tergites 1 and 2 entirely pale orange and silver-white dusted; tergite 4 metallic bluish-white, interrupted by median dorsal dark band; tergites 6 and 7 entirely metallic bluish-white; sternites pale orange to light brown.
Terminalia with segment 8 metallic bluish-white; epiproct, hypoproct and cercus metallic bluish-white.
Type material. HOLOTYPE, ♂ labelled: “ USA: NEW MEXICO / McKinleyCo. 4mi./ S. Fort Wingate/ 8000 ’ 9 -VII- 1966 / P.H.Arnaud, Jr.; “ PAUL H. ARNAUD, JR./ COLLECTION/ Gift to California/ Academy of Sciences/ SanFrancisco, CALIF.; “ HOLOTYPE ♂/ Callomyia arnaudi / H.J. Cumming [red label] [dissected] ( CAS). PARATYPES: USA: NEW MEXICO: same data as holotype (1 ♀, CAS); same data as holotype except 10.vii. 1966 (1 ♀, CAS); Sandoval County, 3.5 km NW La Cueva Santa Fe National Forest, Barley Cyn., 0.5 km off For. Rte. 144, 3553’N, 10640 ’W, 2590 m, MT#15, 23– 24.vii. 1995, S.D. Gaimari (1 ♂, CNC).
Geographical distribution and seasonal occurrence ( Fig. 71View FIGURE 71). Callomyia arnaudi is only known from the type series collected in July from McKinley County and Sandoval County in New Mexico.
Etymology. This species is named after Dr. Paul. H. Arnaud Jr. of the California Academy of Sciences, who collected most of the type specimens.
Remarks. Callomyia arnaudi is closely related to the Nearctic species C. gilloglyorum and the Palaearctic species C. dives and C. saibhira Chandler , as shown in the strict consensus tree ( Fig. 79View FIGURE 79). The male terminalia of C. arnaudi are most similar to the terminalia of C. saibhira (comparison based on description and figures of C. saibhira in Chandler (2001, figs 238−240) and Tkoč & Roháček (2014, fig. 10 )). However, the thoracic and abdominal colour patterns and shape of the hypandrial process differ between these two species.
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