Pseudopterogramma metatarsalis ( Papp, 2008 ), 2025

Kuwahara, Gregory K., Marshall, Stephen A. & Luk, Stephen P. L., 2025, A revision of Parapterogramma Papp and Pseudopterogramma Papp, with a review of the Parapterogramma genus group of the Pacific and Indomalayan regions (Diptera, Sphaeroceridae, Limosininae), European Journal of Taxonomy 998, pp. 1-124 : 107-109

Pseudopterogramma metatarsalis ( Papp, 2008) comb. nov.

Figs 65 , 68I , 69

Archipterogrammoides metatarsalis Papp, 2008: 87 .

Archipterogrammoides metatarsalis – Marshall et al. 2011: 234.

Type material

Holotype

THAILAND – Trang • ♂; Khao Pu-Khao Ya National Park ; 21 Nov. 2004; L. Papp and M. Földvári leg.; along a forest brook below the (Pak Yam) waterfall; HNHM.

Paratypes

THAILAND – Trang • 1 ♂; same collection data as for holotype; HNHM • 1 ♀; Khao Chong Botanical Garden ; 14 Nov. 2004; L. Papp and M. Földvári leg.; along the stream below waterfall; HNHM • 1 ♂; same collection data as for preceding; 15 Nov. 2004; along a forest path; HNHM • 3 ♂♂, 2 ♀♀; same collection data as for preceding; 18 Nov. 2004; rainforest; HNHM • 7 ♂♂, 4 ♀♀; same collection data as for preceding; 22 Nov. 2004; HNHM • 1 ♀; Thung Khai Botanical Garden ; 19 Nov. 2004; L. Papp and M. Földvári leg.; primary lowland rainforest; HNHM .

Material examined

Holotype photo provided by Petra Szöllősi-Tóth, HNHM.

SINGAPORE • 2 ♀♀; Bird Park Buffer (MIS_L08_MT); 2 May 2019; Mandai Insect Survey Project leg.; LKCNHM • 1 ♂, 2 ♀♀; Bird Park Buffer (MIS_L10_MT); 9 May 2019; Mandai Insect Survey Project leg.; DEBU • 2 ♂♂, 3 ♀♀; same collection data as for preceding; LKCNHM • 1 ♂, 1 ♀; Quarantine Area at Zoo (MIS_L05_MT); 30 May 2019; Mandai Insect Survey Project leg.; LKCNHM .

Redescription

BODY ( Fig. 65 ). Length 1.0– 1.5 mm. Head yellow, darkened medially. Interfrontal bristles in three pairs. Antennal scape with an enlarged anterior seta. Thorax yellow-brown, scutum caramel-brown. Anterior dorsocentral bristles separated by 7–8 rows of acrostichal setulae. Inner postpronotal seta minute. Femora yellow-brown, tibiae brown with broad yellow medial band. Ventral surface of male mid tibia with a long apicoventral bristle. Mid basitarsus with a slightly enlarged ventral setula. Hind tibia with a stout apicoventral spur. Wing ( Fig. 68I ) infuscate with several pale vertical blotches. R

2+3

almost straight.

MALE ABDOMEN. S5 strongly asymmetrical, the left side much longer than the right, with a broad posteromedial emargination. S6+7 well-developed; apical third of S6 large and triangular, with a distinct constriction between it and the basal two-thirds, left third of S6 with a medially-projecting triangular lobe. Cercus low and semicircular with two long and several short setae; subepandrial sclerite broad, well-developed, U-shaped with a pair of thin connections to the surstylus. Anterior apodeme of hypandrium short and broad, lateral arms broad. Surstylus short, ovoid, relatively sparsely setose except subbasally and ventrally, with a thickened, tooth-like ventromedial seta. Postgonite elongate, thin, slightly sinuate and apically truncate. Phallapodeme elongate, narrow with a slightly enlarged apex; basiphallus large, thick, and tubular, slightly curved with an anterobasal lip and a subapical notch where the distiphallus articulates. Distiphallus large, “conspicuously empty”, and composed of several sclerites: a long, slightly tapered ventral sclerite with a downturned, bifurcate apex, a pair of S-shaped, subventral sclerites articulating with the apicolateral corners of the ventral sclerite, a broad, saddle-shaped posterodorsal sclerite, and an elongate, apically bifurcate, sinuate sclerite just ventral to the dorsal sclerite; the apex of the distiphallus is membranous between these sclerites.

FEMALE ABDOMEN. T2–4 reduced, leaving a narrow membranous area between T2 and T3, and a larger membranous area between T3 and T4. Epiproct and hypoproct small and weakly sclerotized. Cercus short, broad, and often angled upwards, with long apical, subapical, and lateral setae. Spermathecae stout, bowl-shaped, stem with a globular base, short in the single spermatheca and long in the paired spermathecae.

Distribution

Indomalayan: Singapore (new record), Thailand ( Papp 2008).

Remarks

Several characters of the male genitalia (long, sinuate postgonite; large basiphallus roughly half the length of the distiphallus; distiphallus composed of many well-developed sclerites) seem to be synapomorphic with Ps. aestivale , Ps. brevivenosum , and Ps. conicum , suggesting that the treatment of metatarsalis as a separate genus Archipterogrammoides rendered Pseudopterogramma paraphyletic.

Figures

Fig. 65. Pseudopterogramma metatarsalis (Papp, 2008) (LKCNMH). A. Male habitus, lateral view. B. Male head, anterodorsal view. Scale bars: A = 0.50 mm; B = 0.25 mm.

Fig. 68. Pseudopterogramma Papp, 2008, left wings, ventral views. A. Ps. aestivale (Richards, 1973) (QMBA). B. Ps. annectens (Richards, 1964) (CAS). C. Ps. brevivenosum (Tenorio, 1967) (DEBU). D. Ps. conicum (Richards, 1946) (DEBU). E. Ps. fenestrata (Richards, 1973) (QMBA). F. Ps. fijiensis sp. nov., paratype (BPBM). G. Ps. kasut sp. nov., paratype (DEBU). H. Ps. ketambensis sp. nov., paratype (ROME). I. Ps. metatarsalis (Papp, 2008) (LKCNMH). J. Ps. siamense Papp, 2008 (ROME). Scale bars: A–J = 0.50 mm.

Fig. 69. Distribution map of Pseudopterogramma Papp, 2008.