Labellorrhina quantula, Hippa, Heikki, Mattsson, Ingegerd & Vilkamaa, Pekka, 2005

Hippa, Heikki, Mattsson, Ingegerd & Vilkamaa, Pekka, 2005, New taxa of the Lygistorrhinidae (Diptera: Sciaroidea) and their implications for a phylogenetic analysis of the family, Zootaxa 960, pp. 1-34 : 13-14

Labellorrhina quantula sp. n.

Material studied. Holotype male: BRUNEI, Ladan Forest Res., logged forest, Malaise trap, XII.1992 – II.1993, M. J. Sahat ( MZH). Paratypes: same data as holotype, 9 ♂, same data but ‘primary forest’, 3 ♂ ( MZH, NMWC and NRM).

MALE. Head. Fig. 2 A. Flagellomere 4, Fig. 4 B. Thorax. Fig. 5 A. Anterior pronotum with 5–8 setae. Episternum 1 with 3–4 setae. Laterotergite with 1–4 setae. Legs. Fig. 5 A–C. Femur 1 and 2 slender with straight or concave dorsal and ventral margins, about one half of thickness of femur 3. Tibia 3 with a transverse subapical retrolateral row of 8 – 10 strong setae. Length of basitarsomere 1/length of tibia 1 0.58–0.65. Wing. Fig. 8 C. Wing length 0.98–1.06 mm. Haltere pale. Abdomen. Hypopygium, Fig. 9 A and B.

Discussion. For the distinguishing characters between L. quantula and L. grimaldii , see under the latter.

Figures

FIGURE 2. Male head, frontal view (A and C) and ventral part of head, lateral view (B). A: Labellorrhina quantula sp. n. (paratype). B: Labellorrhina grimaldii sp. n. (holotype). C: Blagorrhina blagoderovi sp. n. (paratype). Scale 0.20 mm. 1: compound eye, 2: ocellus, 3: frons, 4: membraneous stripe, 5: scapus, 6: pedicellus, 7: flagellomeres, 8: face, 9: clypeus, 10: labrum, 11: maxillary palp, 12: hyaline sensilla, 13: hypopharynx, 14: labellum.

FIGURE 4. Antennal flagellomere 4, lateral view. A: Blagorrhina blagoderovi sp. n. (paratype). B: Labellorrhina quantula sp. n. (paratype). C: Lygistorrhinidae sp. 1 (Malaysia). D: Blagorrhina brevicornis sp. n. (paratype). E: Gracilorrhina gracilis sp. n. (paratype). F: Labellorrhina grimaldii sp. n. (holotype). Scale 0.05 mm. 1: socketed seta, 2: seta­like sensillum / unsocketed seta, 3: peglike sensillum.

FIGURE 5. Labellorrhina quantula sp. n. (paratypes): male thorax (A), lateral view, hind femur, tibia and basitarsomere (B), retrolateral view, apical part of hind tibia (C), retrolateral view and apical part of middle tarsus (D), lateral view. Scale for A 0.10 mm, for B 1 mm, for C and D 0.05 mm.

FIGURE 8. Male (B­E) and female (A) wing, dorsal view. A: Lygistorrhinidae sp. 2 (Malaysia). B: Labellorrhina grimaldii sp. n. (holotype). C: L. quantula sp. n. (paratype). D: Gracilorrhina gracilis sp. n. (paratype). E: Blagorrhina blagoderovi sp. n. (paratype). Scale 0.50 mm.

FIGURE 9. Part of male hypopygium (A, C) and gonostylus (B, D), ventral view. A and B: Labellorrhina quantula sp. n. (holotype). C and D: L. grimaldii sp. n. (holotype). Scale 0.05 mm. 1: tergite 9, 2: apodeme of tergite 9, 3: gonocoxite, 4: gonostylus, 5: basolateral apophysis of gonostylus, 6: basomesial impression of gonostylus, 7: elongated basomesial seta of gonostylus, 8: apical tooth of gonostylus, 9: cercus, 10: sternite 10, 11: tegmen, 12: apodeme of tegmen, 13: aedeagal apodeme, 14: parameral apodeme, 15: gonocoxal apodeme.