In order to understand the predatory or parasitoid behavior of the Sciomyzidae on molluscs, it is important to have a good knowledge of the systematics of the taxa involved. This information enables accurate identification of the species and an understanding of their phylogenetic relationship. In the latter paper, the authors have also reviewed the biology and systematics of the family, which now includes around 550 species in 61 genera.
Data on the natural history and immature stages are known for about a third of the world's species. With about 125 known species (at least 20 are undescribed), Sepedon Latreille, 1804, and related genera comprise nearly 25 percent of the family's species. Without their cooperation and assistance, much of the study could not have been completed.
USNM Collections of the United States National Museum at the National Museum of Natural History, Smithsonian Institution, Washington, DC, USA. We also thank Mary Lou Cooley, Systematic Entomology Laboratory, IIBIII, for completing the illustrations created by AF, and for preparing the plates.
CERC
Midfemur posteroventrally with 8-15 spines extended 2 /3 distance to base (frequently, the basad spines becoming weak and hardly distinguishable from
Cephalopharyngeal skeleton 0.49-0.52 mm long, with paired mandibles 0.09-0.10 mm long, each with 3 mesally directed auxiliary teeth;. Cephalopharyngeal skeleton (figure mm long, with paired mandibles 0.07-0.10 mm long, each with 4 mesally directed auxiliary teeth and 2 holes, 1 near middle and the other near dorsal margin. Two stigmatic tubes each with spiracular plate, stigmatic scar, 3 spiracular slits, and 4 semi-transparent, irregularly branched drift setulae.
Two stigmatic tubes brown when viewed laterally, each with dark sclerotized spiracular plate, stigmatic scar, 3 spiracular slits, and 4 irregularly branched, subopaque drift setulae. Posterior spiracular disc with 5 pairs of lobes: ventral pair conical, tapering; ventrolateral pair as in first instar larva, except larger and more hairy; dorsolateral, lateral and dorsal lobes low, rounded projections; entire disc very setulose; 2 stigmatic tubes each bearing a spiracular plate, each with 3 elongate-ovoid spiracular slits, outer 2 somewhat arcuate, 1 stigmatic scar, and 4 irregularly branched, semitransparent floating setulae. Setulae arranged in concentric circles on disc, considerably less setulose than disc of S. Two stigmatic tubes, each with spiracular plate bearing a B-shaped spiracular slit and 4 rather large, irregularly branched, transparent drift setulae.
Two stigmatic tubes, each with a spiral plate containing 3 elongated-ovoid spiral slits, 1 stigmatic scar and 4 dark-transparent, irregularly branched float setulae. Cephalopharyngeal skeleton 0.67–0.75 mm long, with paired mandibles, each with 3 or 4 accessory teeth directed mesally; very similar to that of S. Two stigmatic tubes arising near the center of the disc, each with a spiral plate with a stigmatic scar, 3 spiral slits with openings like those in S. lagoa, and 4 irregularly branched, dark, subopaque float setulae .
Abdomen: Male terminalia: Posterior margin of sternum 4 flared, with median lobe (Figure 70); anterior plate of sternum 5 mesal with short posterior flange and more anterior projections (Figure 70); distiphallus (Figure 71) strongly arched, with elongated, slightly curved, posteroventral process; anterior surstylus unclear; posterior surstyli with large, triangular middle lobe (Figure 72) and with small lateral lobe, slightly curved anterad (Figure 73). Two stigmatic tubes, each with a spiral plate (Figure 121) containing 1 B-shaped spiral slit and 4 darkly transparent, irregularly branched float setulae. Two stigmatic tubes, each with a spiral plate with 3 small spiral slits, 1 stigmatic scar and 4 irregularly branched, dark-transparent float setulae.
The entire disc is quite hairy and closely resembles that of S. Two separate stigmatic tubes, each with a spiral plate with a B-shaped spiral slit and 4 irregularly branched, transparent float setulae, each with gland pores at the base. Cephalopharyngeal skeleton 0.52–0.54 mm long, with paired mandibles 0.09–0.11 mm long, each with 3 accessory teeth directed mesally; very similar to that of S. 1 bilobed anteriorly, each lobe with sensory papilla. Cephalopharyngeal skeleton 0.83-0.84 mm long, with paired mandibles, each with 4 accessory teeth; lower jaw 0.15-0.16 mm long, very similar to that of other Sepedonea.
Spiracular plate (Figure 131) with 3 spiracular slits, a stigmatic scar, and 4 large, semitransparent, irregularly branched floating setae, each with glandular pores at base. proleg as in second instar larva. Abdomen: Male terminalia: Posterior margin of sternum 4 gently concave without projections (Figure 88); anterior plate of sternum 5 with anteriorly curved, narrow projection (Figure 88); distiphallus (Figure 89) slightly curved, with posteroventral projection; anterior surstylus indistinct; posterior surstyli lacking median lobe, straight mesoventrally (Figure 90), and with lateral lobe strongly curved anterad (Figure 91).
S. barbosal
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