Pseudopterogramma kasut, Kuwahara & Marshall & Luk, 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 : 101-102

Pseudopterogramma kasut sp. nov.

urn:lsid:zoobank.org:act:F48A9B40-DE5F-4F69-BA7B-17865058BF15

Figs 60–62 , 68G , 69

Etymology

The species name (from the Malay ‘ kasut ’, ‘shoe’) refers to the distinctive, shoe-shaped surstylus.

Material examined

Holotype

SINGAPORE • ♂; National University of Singapore , Prince George Park Residence; 3 May 2017; NUS Insect Survey leg.; LKCNHM.

Paratypes

INDONESIA – Java • 1 ♂; Ujung Kulon, Gunung Payung; 21 Sep. 1984; 1984 Zoological Expedition Krakataus leg.; Malaise; ANIC .

SINGAPORE • 1 ♂; Nee Soon Swamp Forest (NS1); 23 May 2012; Singapore Mangrove Insect Project leg.; DEBU • 1 ♂, 1 ♀; same collection data as for preceding; 15 May 2013; DEBU • 1 ♀; same collection data as for preceding; 26 Jun. 2013; DEBU • 1 ♂; same collection data as for preceding; 10 Jul. 2013; LKCNHM • 1 ♂; same collection data as for preceding; 6 Nov. 2013; DEBU • 2 ♂♂, 1 ♀; Nee Soon Swamp Forest (NSM1); 3 Dec. 2014; Singapore Mangrove Insect Project leg.; LKCNHM .

Description

BODY ( Fig. 60 ). Length 1.1–1.4 mm. Head caramel-brown, slightly darkened at level of ocelli, orbital plates, and interfrontal plate. Interfrontal bristles in four fine pairs. Thorax brown, scutum caramel-brown and shiny; scutellum brown. Anterior dorsocentral bristles separated by 7–8 rows of acrostichal setulae. Fore tibia and basal two-thirds of hind tibia yellow, mid tibia and femora brown. Ventral surface of male mid tibia with a small midventral bristle and a small apicoventral bristle. Hind tibia with several long, fine, dorsal preapical setae (slightly shorter than first hind tarsomere). Wing ( Fig. 68G ) hyaline with a dark spot around R

2+3

. R

2+3

very slightly sinuate; M

4

not extending beyond dm-m.

MALE ABDOMEN ( Fig. 61 ). S5 simple, broad, right side subequal to left, uniformly setose laterally, and slightly desclerotized posteromedially. S6 long but relatively broad with a setulose membranous part under (dorsal to) posteromedial part of S5, anterolateral corner slightly expanded and flared. Epandrium large, wedge-shaped, longer on left side, and uniformly setose, ventrolateral margin greatly enlarged and fused to cercus; cercus large, flattened, and slightly paler than epandrium, with several long setae, ventral surface with a narrow fused bar (superficially similar to a subepandrial sclerite?). Surstylus long but low, strongly curved (L-shaped), ventral margin with several long setae, apex densely setulose on both inner and outer surfaces (more-so on inner surface). Postgonite elongate, anterior margin sinuate, apex curved forwards (J-shaped) with several stout, tooth-like ventral lobes along inner surface. Phallapodeme relatively short and apically bent; basiphallus small, ring-shaped with a small posterodorsal point. Distiphallus very large, largely membranous with a small, ring-like sclerotized basal part and a U-shaped apical sclerite supporting membranous apex; membrane with large, densely creased and setulose dorsal flaps.

FEMALE ABDOMEN ( Fig. 62 ). Epiproct broad, slightly pentagonal, desclerotized anteromedially and entirely setulose. Cercus subtriangular with long, sinuate apical seta and preapical setae. S8 subrectangular, well-developed. Hypoproct trough-shaped. Spermathecae stout and asymmetrical, single spermatheca large and spherical with rows of small basal pits, paired spermathecae significantly reduced and balloonshaped.

Remarks

Pseudopterogramma kasut sp. nov. and Ps. annectens have similar largely hyaline wings and both species have three pairs of weak interfrontal bristles, but Ps. kasut is characterized by an indistinct M 4 beyond dm-m, a small mid ventral mid tibial seta, and a stout apicoventral mid tibial seta.

Figures

Fig. 60. Pseudopterogramma kasut sp. nov., paratype (ANIC). A. Male habitus, lateral view. B. Male head, anterodorsal view. Scale bars: A = 0.50 mm; B = 0.25 mm.

Fig. 61. Pseudopterogramma kasut sp. nov., paratype (ANIC). A. Aedeagus and associated structures, lateral view. B. Male terminalia, lateral view. C. Male S5-8, ventral view. Scale bars: A–C = 0.10 mm.

Fig. 62. Pseudopterogramma kasut sp. nov., paratype (ZRC_BDP 0104778, DEBU). A. Female terminalia, dorsal view. B. Female terminalia, ventral view. C. Female terminalia, lateral view. D. Single spermatheca. E. Paired spermathecae. Scale bars: A–C = 0.30 mm; D–E = 0.01 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.