Labellorrhina grimaldii, 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 : 14

Labellorrhina grimaldii sp. n.

Material studied. Holotype male: MALAYSIA, Selangor, Ulu Gombak, Univ. of Mal. Field Stud. Center, forest, 244 m (800 ft.), Malaise trap, 2–8. III. 1997, H. Hippa, M. Jaschhof & B. Viklund ( NRM).

MALE. Similar to L. quantula . Head. Mouthparts, Fig. 2 B. Flagellomere 4, Fig. 4 F. Anterior pronotum with four setae. Thorax. Episternum 1 with 6 setae. Laterotergite with 2 setae. Legs. Femur 1 and 2 distinctly thickened, with convex dorsal and ventral margins, more than half the thickness of femur 3. Tibia 3 with a transverse subapical retrolateral row of 4 or 5 strong setae. Length of basitarsomere 1/length of tibia 1 0.53–0.54. Wing. Fig. 8 B. Wing length 0.96–0.97 mm. Hypopygium, Figs. 9 C and D.

Etymology. The species epithet is dedicated to Dr. David Grimaldi, American Museum of Natural History, New York, to acknowledge his contribution to the study of Lygistorrhinidae .

Discussion. Labellorrhina grimaldii is similar to L. quantula , but is distinguished by, for example, the following characters: antennal flagellomeres shorter than broad (in L. quantula as long as broad), maxillary palpus longer, three­fourths of the length of labellum (only slightly more than half of labellum), the subapical retrolateral comb of strong setae on hind tibia consisting of 4 to five setae (8 to 10 setae), and the tegmen more rectangular in shape ( Fig. 9 A and C). Furthermore, the junction between C and R1 seems to be less acute in L. grimaldii than in L. quantula ( Fig. 8 B and C), and the dark patch at the apex of R1 is of the same intensity as the subapical patch in L. grimaldii , not weaker than the subapical patch as in L. quantula (this difference is not very clear in Fig. 8 B and C).

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 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.