Genus Mahania Poppius

Mahania Poppius, 1915: 60 (n. gen.), type species: M. elongata Poppius, 1915: 61, original designation; Yasunaga & Schwartz 2007: 173 (diag., redesc.). Philostephanus Distant (part): Carvalho 1952: 92, 95 (n. syn., cat.); 1959: 187 (cat.); Schuh 1995: 862 (cat.).

Diagnosis. Recognized by the elongate body, shortened labium that is not exceeding the mesocoxa, flattened inward surface of the right paramere, strongly projected sensory lobe of the left paramere, a narrow keel along the phallotheca, and a single spiculum and developed right lateral sclerite on the vesica. Further diagnostic characters were provided by Yasunaga & Schwartz (2007).

Discussion. Mahania has been represented by a single species, M. elongata, known from Nepal and north India, south slope of the Himalayas. The following species is the second member of this unique genus.

Mahania ptilophalla Yasunaga & Duwal nov. sp. Figs 5, 6, 11, 12, 19, 22

Diagnosis. Recognized by the small size, wholly dark antennal segment II that is much longer than basal width of the pronotum, and highly modified form of the vesica.

Description. Male (female unknown): Body generally brownish, partly tinged with red, elongate, nearly parallel-sided; dorsal surface widely chocolate brown, weakly shining, with uniformly distributed, silky, reclining pubescence and brown, simple setae. Head shiny brown, almost smooth. Antenna dark brown; segment I about as broad as II; segment II much longer than basal width of pronotum, equal to metafemur; segment III and IV filiform, with whitish bases. Labium pale brown, short, reaching base of mesocoxa; apical half of segment IV dark brown. Pronotum shining, widely darkened posterior to calli; collar creamy yellow, about as thick as base of antennal segment II; scutellum chocolate brown, rather flat, with pale extreme apex; pleura unicolorously pale brown. Hemelytron chocolate brown; embolium and lateral margin of cuneus reddish brown; membrane smoky brown, with pale veins. Coxa and leg pale brown; tibial spines pale brown; apical half of tarsomere III dark brown.

Male genitalia: Parameres as in Figs 11, 12; right paramere slender, flattened inwardly (11); sensory lobe of left paramere with a flat, conspicuous protuberance (12). Vesica (19) highly modified and sclerotized, with feather-like, hairy appendages; spiculum flattened and broadened; phallotheca with a narrow keel.

Measurements (S): Body length 6.4; head width across eyes 1.15; vertex width 0.36; lengths of antennal segments I-IV 0.96, 2.71, 1.08, 0.53; total labial length 1.58; mesal pronotal length including collar 1.20; basal pronotal width 2.11; width across hemelytron 2.40; lengths of metafemur, tibia and tarsus 2.16, 3.48, 0.72.

Holotype S: NEPAL, Kathmandu, Nagarjun (1,600~1,800 m alt.), on Quercus sp., 16. v. 2005, T. Yasunaga (AMNH).

Etymology. From Greek, ptilon (soft feather, down) in combination with phallus (male phallic organ), referring to the unique feather-like pubescence on the vesica of this new species.

Distribution. Nepal (temperate Quercus forest).

Discussion. As the vesica has peculiar structure, this new species is at first sight difficult to be accommodated in any known genera. But the principal coloration and structure of the dorsal surface, short rostrum, inwardly flattened right paramere, developed sensory lobe of the left paramere and a narrow keel of the phallotheca apparently represent diagnostic characters of Mahania. We currently consider the highly modified form of the vesica as simply an autapomorphy.

+1 0

Post a comment