Callomyia bertae Kessel

Cumming, Heather J. & Wheeler, Terry A., 2016, Revision of the Nearctic species of Callomyia Meigen (Diptera: Platypezidae) and phylogeny of the genus, Zootaxa 4111 (5), pp. 501-554: 515-516

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Callomyia bertae Kessel


Callomyia bertae Kessel 

( Figs 8View FIGURES 4 − 8, 17View FIGURES 15 − 18, 26View FIGURES 25 − 28, 34View FIGURES 33 − 36, 57View FIGURES 55 − 58, 71View FIGURE 71)

Callomyia bertae Kessel, 1961 a: 193  . Type locality: Pinos Altos Mountains, New Mexico, USA.

Diagnosis. This southwestern Nearctic species is characterized by its silver-blue thoracic and abdominal markings and male terminalia with a bifid surstylus. Callomyia bertae  is most similar in colour to the southwestern Nearctic species C. arnaudi  , but can be distinguished from this species by a different pattern of silver-blue markings on the abdomen, paler legs and a paler halter colour, and differences in the male terminalia that are indicated in the key to species. The male terminalia of C. bertae  are similar to those of C. proxima  from eastern and western North America, but are yellow with a dark brown surstylus (versus brown to grey with a dark brown to black surstylus) and have a longer dorsal projection on the hypandrial process.

Description. Male ( Figs 8View FIGURES 4 − 8, 17View FIGURES 15 − 18). Body length 3.5 mm; wing length 3.55 mm. Head dark silver-grey; 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 silver-blue markings on lateral portion of presutural scutum, notopleuron, most of postsutural scutum, and postalar callus; propleuron, mesopleuron, metapleuron, mediotergite and laterotergite silver-grey dusted. Scutum with 5 notopleural setae.

Legs pale yellow with fore and mid tarsomeres 4 and 5 dark brown, hind leg darker with tibia and tarsomeres dark brown. 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. Halter yellowish-orange.

Abdomen black with dorsolateral silver-blue markings on tergites 1 and 2; posterolateral silver-blue markings on tergites 3 and 4; tergite 7 entirely light brown; sternites pale yellowish-brown, sternite 8 light brown.

Terminalia ( Fig. 57View FIGURES 55 − 58) yellow, except surstylus dark brown. Epandrium with minute ventral lobe, barely apparent; apical process short, broad at apex. Surstylus bifid with long outer and inner process, both rounded at apex; outer process broader and longer; inner process narrower and shorter. Hypandrium with moderately long apical process; process bifid, with 2 apical projections; dorsal projection narrow and long, ventral projection broad and short. Postgonite long and moderately wide, somewhat truncated and slightly pointed at apex. Phallus  sharply hooked at apex. Cercus short.

Female. Unknown.

Type material. HOLOTYPE, ♂ labelled: “Pinos Altos/ Mts.,Grant/ Co.,N.M./ 8-28 - 51; “E.L.Kessel/ Collector; HOLOTYPE / Callomyia  / bertae  / Kessel [red label]; “California Academy/ of Sciences/ Type No. 6452 [dissected, first flagellomere and arista missing from antenna] ( CAS).

Geographical distribution and seasonal occurrence ( Fig. 71View FIGURE 71). Callomyia bertae  is only known from the holotype collected from the Pinos Altos Mountains in Grant County, New Mexico, in late August.

Remarks. Callomyia bertae  is closely related to the Nearctic species C. proxima  and the Palaearctic species C. dorsimaculata Shatalkin  , C. elegans  , and C. sonora  , as shown in the strict consensus tree ( Fig. 79View FIGURE 79).

A series of seven female specimens from Durango, Mexico ( Fig. 71View FIGURE 71) may be conspecific with the male of C. bertae  , based on similarities in colour. Five specimens are from 10 miles west of El Salto, collected on 14- 1964 at 9000 feet and two specimens are from 14 miles southwest of El Salto, collected on 1964 at 8000 feet (all collected by J.F. McAlpine, deposited in CNC). These females ( Figs 26View FIGURES 25 − 28, 34View FIGURES 33 − 36) have similar metallic bluishwhite thoracic and abdominal colour patterns to the females of C. arnaudi  (which is similar to C. bertae  —see “Diagnosis above), but abdominal tergite 4 is entirely metallic bluish-white and is not interrupted by a median dorsal dark band. In addition, these females are larger in size than those of C. arnaudi  . They are also similar in appearance to the females of C. gilloglyorum  because of similar thoracic and abdominal colour patterns. However, the colour of the potential C. bertae  females is more metallic bluish-white than silver-grey and abdominal tergites 2, 4 and 6 are complete and not interrupted by a median dorsal dark band.


California Academy of Sciences


Canadian National Collection of Insects, Arachnids, and Nematodes














Callomyia bertae Kessel

Cumming, Heather J. & Wheeler, Terry A. 2016

Callomyia bertae

Kessel 1961: 193