Pseudopterogramma ketambensis, 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 : 105-107

Pseudopterogramma ketambensis sp. nov.

urn:lsid:zoobank.org:act:6186D844-2094-4D39-BCE9-E6247FA45393

Figs 63–64 , 68H , 69

Etymology

This name refers to the type locality of this species, Ketambe Research Station in Indonesia.

Material examined

Holotype

INDONESIA – Sumatra • ♂; Aceh, Mount Leuser National Park, Ketambe Research Station; 350 m a.s.l.; 4 Sep. 1989; B. Hubley leg.; screen sweep along Alas River ; ROME.

Paratypes

INDONESIA – Sumatra • 1 ♂; Aceh, Mount Leuser National Park, Ketambe Research Station ; 350 m a.s.l.; 9–21 Sep. 1989; D.C. Darling leg.; lowland rainforest, mature forest (T4), light gap, Malaise with pans; ROME .

MALAYSIA – Pahang • 1 ♂; Kuala Tahan, Taman Negara National Park ; 200 m a.s.l.; 20–21 Jun. 1990; J.M. Heraty leg.; rainforest; DEBU . – Sabah • 1 ♂; Mount Kinabalu National Park, Poring Hot Spring area, Eastern Ridge Trail ; 700–850 m a.s.l.; 28 Aug. 1988; A. Smetana leg.; DEBU .

Description

BODY ( Fig. 63 ). Length 1.5–1.6 mm. Head caramel-brown, slightly darkened at level of ocelli, orbital plates, and interfrontal plate. Interfrontal bristles in three fine pairs. Thorax brown, scutum caramel-brown and dull; scutellum brown. Anterior dorsocentral bristles separated by 7–8 rows of acrostichal setulae. Fore and hind tibia with yellow median band, mid leg and femora brown. Ventral surface of male mid tibia with two rows of stout setae along apical quarter; mid femur with two corresponding rows of proximoventral setae. Wing ( Fig. 68H ) infuscate with several pale vertical bands. R 2+3 almost straight.

MALE ABDOMEN ( Fig. 64 ). S5 simple, broad, right side 1.1× as long as left, uniformly setose laterally, and broadly desclerotized posteromedially with a row of longer setae along anterior margin of desclerotization. S6 long but relatively broad with a trapezoidal sclerotized part under (dorsal to) posteromedial part of S5, anterolateral corner slightly expanded. Epandrium large, longer on left side, and uniformly setose, ventrolateral margin distinctly notched; cercus large, flattened, and slightly paler than epandrium, with several long setae. Surstylus long but low, slightly bent: anterior lobe long, subrectangular, bent inwards slightly with a stout, blade-like apical seta, ventral margin setose, posterior lobe stout, rectangular but rounded apically with long ventrolateral setae and some stout ventral setae. Postgonite elongate, slender, bisinuate, apex with a small tooth. Phallapodeme long, slightly sinuate, and apically rounded; basiphallus large, saddle-shaped with a pair of triangular, anterolateral lobes. Distiphallus large, box-like, with dorsal and ventral sclerites: basal half of ventral sclerite broad and posteriorly setulose, apical half split into thin, lateral lobes which connect to a U-shaped apical sclerite; dorsal sclerite Y-shaped, basal part triangular and arched, apical part split into narrow lateral arms; apex of distiphallus membranous and papillate, lateral membrane with dense setulae.

FEMALE ABDOMEN. Female unknown.

Remarks

Pseudopterogramma ketambensis sp. nov. is superficially most similar to Ps. fenestrata , from which it differs in having banded fore and hind tibiae, a relatively straight R 2+3, very long setae on the male S5, long but low surstyli, and very narrow postgonites.

Figures

Fig. 63. Pseudopterogramma ketambensis sp. nov., holotype (ROME). A. Male habitus, lateral view. B. Male head, anterodorsal view. Scale bars: A = 0.50 mm; B = 0.25 mm.

Fig. 64. Pseudopterogramma ketambensis sp. nov., paratype (ROME) 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. 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.