Diadocidia similis, Jaschhof, Mathias & Jaschhof, Catrin, 2007

Jaschhof, Mathias & Jaschhof, Catrin, 2007, On the genus Diadocidia (Diptera, Sciaroidea, Diadocidiidae) in Costa Rica, Zootaxa 1586, pp. 33-38 : 37-38

Diadocidia similis sp. n.

( Fig. 2 B and D)

Description. Male. Body length 2.8–3.1 mm. Head. Antennal flagellum with short non-socketed setae intermingled with a few sensory spines; longest setae as long as half flagellomere width. First flagellomere twice as long as wide ( Fig. 2 B). Fourth flagellomere 1.3 times as long as wide ( Fig. 2 B). Maxillary palpus 5-segmented; third segment thickest, stout, 1.6 times as long as second segment, bearing a very few short hyaline sensilla apart from ordinary setae elsewhere; fourth and fifth segments elongate cylindrical, fifth segment 1.6 times as long as fourth segment.

Thorax. Anepisternum with 4 (holotype), 8 or 12 (paratypes) setae in upper portion, other pleura non-setose. Legs. Antero-apical depression of fore tibia with distinct semicircular rim, bearing some 15 non-socketed, stiff setae scattered rather than ordered in lines. Wing. Length 2.7 mm. Venation similar to hybrida , but Sc entering C shortly before level of ta.

Terminalia. Fig. 2 D. Width at base of gonostylus tooth 0.4 times the length. Otherwise similar to hybrida .

Female. Unknown.

Discussion. We do not assign similis to any subgenus for the same reasons as explained under hybrida . These two species are very similar and apparently closely related. Compared with hybrida , the gonostylus body in similis is somewhat broader basally and the apical tooth is thicker. The first antennal flagellomere is shorter in similis than in hybrida . The third palpus segment is thickened in similis , while it is not so in hybrida . Setae of the fore tibial anteroapical depression are scattered in similis , while they are partly arranged in a line in hybrida .

Etymology. From Latin, similis , similar, referring to the similarity to hybrida .

Types. Holotype. Male (on slide). Costa Rica, Cartago province, Parque Nacional Tapantí-Macizo de la Muerte, Estación La Esperanza, alt. 2200-2600 m, 3–22 Nov. 2003, by Malaise trap, M. & C. Jaschhof. Paratypes. 1 male (in ethanol), same data as the holotype; 1 male (in ethanol), Puntarenas province, Parque Internacional La Amistad, Estación Altamira, Cerro Biolley, alt. 1700 m, 11 June–11 July 2001, by Malaise trap, D. Rubí (INBio sample #64127B).

Figures

FIGURE 2. Morphology of Diadocidia spp. A: Male antennal flagellomeres 1 – 4, lateral view, of D. hybrida sp. n. (holotype). B: Male antennal flagellomeres 1 – 4, lateral view, of D. similis sp. n. (holotype). C: Gonostylus, ventral view, of D. hybrida sp. n. (holotype). D: Male terminalia, ventral view, of D. similis sp. n. (holotype). E: Apex of ovipositor, lateral view, of D. hybrida sp. n. (paratype). Scale = 0.1 mm (A, B and E) and 0.05 mm (C and D).