Eosalpingogaster

Pérez-Bañón, Celeste, Arcaya, Evelin, Mengual, Ximo & Rojo, Santos, 2013, Preimaginal morphology of the genera Salpingogaster Schiner, 1868 and Eosalpingogaster Hull, 1949 (Diptera: Syrphidae), with its systematic implications, Zootaxa 3599 (4), pp. 361-370 : 364-365

Eosalpingogaster sp.

Overall appearance. Length 6–7 mm, maximum width 2.5–3 mm and height 2.5–3 mm. (see Fig. 1E, F). Pearshaped, in profile with dorsal and ventral margins of the posterior end forming an acute angle until the anterior bulge (fourth first abdominal segments). Outline slightly serrated, sub-cylindrical in cross-section, anterior end truncate, tapered posteriorly and flattened ventrally. Integumental vestiture and segmental sensilla persisting except on the ventral surface. Dorsal surface covered with short pointed papillae. Colour of empty puparium dull cream with dark brown spots in front of tubercle bases dorsally and along the lateral sides of puparium. The slightly serrated outline is due to medium development of basal papillae of segmental sensilla, as tubercles, on the 2nd, 3rd and 4th abdominal segment. There are three transverse rows of paired tubercles (segmental pairs of sensilla 1, 2, 3).

Tubercles of segmental pair of sensilla 1 are less developed on the 2nd than on the 3rd and 4th abdominal segment (Fig. 2C). Basal papilla of segmental sensilla 5–6 not developed. On the last abdominal segments (5th, 6th and 7th) the basal papillae of segmental sensilla are dried and collapsed not forming tubercles. Dorsal and dorsolateral segmental pairs of sensilla with apical setae visible. The last three abdominal segment (5th, 6th and 7th) and anal segment narrowed significantly towards the base of posterior breathing tube.

FIGURE 2. 2nd and 3th abdominal segments. A, Eosalpingogaster umbra ; B, Salpingogaster nigra ; C, Eosalpingogaster sp. Arrows point to the tubercles of the segmental pairs of sensilla 1, 2 and 3 on 2nd abdominal segment.

Posterior breathing tube (prp): Short, broader than long. Dark brown in colour, lustrous. Spiracular plate little higher than wide, not differentiated in colour from the rest of prp. Spiracular plate divided by a shallow Vshape median groove. Ecdysial scars displaced anteriorly. Diameter of ecdysial scars is almost the length of the spiracular opening I. Dorsal spur absent (compare with Fig. 3 B-D). Spiracular openings straight, mounted on welldeveloped carinae. Carinae about twice as long as wide, extending down the sides of prp. Spiracular opening II closer to III than to I. Angle between spiracular openings II and III near 90° ( Fig. 3 C). Interspiracular ornamentation reduced, interspiracular setae very short, hardly visible by light microscope, mounted inside of small circular nodules. Interspiracular setae between opening I and II close, but with their nodules clearly separated.

Material examined: VENEZUELA: 1 puparium incorrectly associated to an adult female specimen of E. umbra , Mérida, Timotes, 2050 m., 12.x.1971, leg. A. Briceño, “ex. larva pred. de Dactylopius Costa en Opuntia ” USNM ENT 00037122 ( MIZA).

Figures

FIGURE 3. Posterior respiratory process (prp). A, Eosalpingogaster umbra; B, Salpingogaster nigra; C, Eosalpingogaster sp.; D, Ocyptamus sp.; E, Toxomerus sp. Arrows point to spiracular openings.