Pendleburyella eirmosa, Tan & Muhammad & Wahab, 2023

Tan, Ming Kai, Muhammad, Amira Aqilah & Wahab, Rodzay Bin Haji Abdul, 2023, The taxonomy and bioacoustics of the elusive crickets from the genus Pendleburyella Chopard, 1969 (Gryllidae: Pentacentrinae), Zootaxa 5277 (1), pp. 131-148 : 142-144

Pendleburyella eirmosa sp. nov.

( Figs. 1 , 5B , 6B, 6D, 6F , 7D , 8D , 9D–F )

Diagnosis. This species is characterised by a medium-sized habitus (similar to Pendleburyella testacea ), the maxillary palps with the apical segment also somewhat rectangular (similar to that of Pendleburyella vicina but stouter); the mirror longer than broad, the dividing vein of the mirror broadly and roundly curved at the basal end; the apical part of FW longer relative to the FWL. The genitalia also differs from that of Pendleburyella pimela sp. nov. (see the diagnosis for the latter species).

Etymology. The species name refers to the broadly rounded emargination between the dorsal and ventral processes of the pseudepiphallic paramere (distinguished from the narrowly angular emargination in Pendleburyella pimela sp. nov.); eirmós = continuity in Ancient Greek.

Material examined. Holotype: BRUNEI DARUSSALAM • 1♁; Belait District, Wasai Wong Kadir Recreational Park ; N4.34186, E114.44611, 35.8± 5.2 m.a.s.l.; 1 March 2019, 18h54; calling on a leaf; coll. M.K. Tan & H. Yeo; BRU.19.47 ( UBDM)

Photograph examined. BRUNEI DARUSSALAM • 1♁; Temburong District, Kuala Belalong Field Studies Centre, along Ashton Trail ; N4.54619, E115.15690, 110.8± 6.9 m.a.s.l.; 26 July2017, dusk; on leaf litter; photographed M.K. Tan ( Fig. 1 ) .

Description. Medium-sized species for this genus. Maxillary palpi with apical segment stout and cylindrical to somewhat rectangular; with subapical segment very stout, distinctly shorter than apical and third segments ( Fig. 7D ). Pronotal disc brown, about 1.7 times as wide as long, widening posteriorly (posterior margin about 1.6 times as wide as anterior margin); anterior margin of disc somewhat straight; posterior margin of disc slightly convex ( Fig. 6B ). Pronotal lateral lobe 2.0 times as long as high ( Fig. 7D ).

Male. FW 2.6 times as long as broad ( Fig. 8D ), covering abdomen and slightly surpassing apex of FIII. Venation ( Fig. 8D ): 1A vein transverse, faintly sinuous; diagonal faintly bent, with 3 distinct oblique veins in harp area; posterior two oblique veins parallel to each other, anterior most vein distinctly shorter and running nearly along length of FW. Mirror about 1.2 times as long as wide, dividing vein broadly curved at basal end. Lateral field around 7 branches on Sc ( Fig. 6F ). Apical field 0.11 times as long as FWL ( Fig. 8D ). Hind wings clearly surpassing FWs.

♁ genitalia ( Figs. 9D–F ). Pseudepiphallus [epiphallus] typical of genus. Posterior end of pseudepiphallus [epiphallus] produced into two lobular pseudepiphallic lophi [posterolateral epiphallic lobe], in dorsal view tongue-shaped with apex obtuse; more broadly emarginated between latero-apical lobules; in profile distinctly flattened. Pseudepiphallic paramere [ectoparamere] not surpassing pseudepiphallic lophi, sclerotized, also slender and tapering into subacute apex. Dorsal process of pseudepiphallic paramere not surpassing ventral process. Ventral process of pseudepiphallic paramere obtuse at apex in ventral view. In profile, emargination between dorsal and ventral processes of pseudepiphallic paramere broadly rounded. Ectophallic fold [rachis] typical of genus; in profile slenderer.

Measurements (♂, in mm). BL = 6.5; BWL = 10.1; HL = 0.9; PronL = 1.2; PronW = 2.0; FWL = 6.2; FWW = 2.4; HWT = 2.1; FIIIL = 4.0; TIIIL = 3.1; TaIIIL = 1.6.

Ecology. The species was found dwelling among the leaf litter as well as on the leaves of shrub/small trees.

Distribution. Borneo ( BRUNEI DARUSSALAM, Belait).

Type locality. BRUNEI DARUSSALAM, Belait .

Figures

FIGURE 1. Pendleburyella J adult among the leaf litter in Kuala Belalong Field Studies Centre, Brunei Darussalam. The specimen was uncollected but identified as presumably Pendleburyella eirmosa sp. nov.

FIGURE 5. Pendleburyella pimela sp. nov. (A) and Pendleburyella eirmosa sp. nov. (B) J dorsal habitus. Scale bar: 5 mm.

FIGURE 6. Pendleburyella J morphology: head and pronotum in dorsal view (A, B), face in anterior view (C, D), body in lateral view (E, F). Pendleburyella pimela sp. nov. (A, C, E); Pendleburyella eirmosa sp. nov. (B, D, F). Scale bars: 1 mm (A–D), 5 mm (E, F).

FIGURE 7. Pendleburyella J head and pronotum in lateral view: Pendleburyella testacea (A), Pendleburyella vicina (B), Pendleburyella pimela sp. nov. (C), Pendleburyella eirmosa sp. nov. (D), Pendleburyella sp. 1 (E), Pendleburyella sp. 2 (F). Scale bar: 2 mm.

FIGURE 8. Pendleburyella J FWs: Pendleburyella testacea (A), Pendleburyella vicina (B), Pendleburyella pimela sp. nov. (C), Pendleburyella eirmosa sp. nov. (D), Pendleburyella “intermedia” (E), Pendleburyella sp. 1 (F), Pendleburyella sp. 2 (G). Scale bar: 2 mm.

FIGURE 9. Pendleburyella J genitalia: Pendleburyella pimela sp. nov. (A–C) and Pendleburyella eirmosa sp. nov. (D–F) in dorsal (A, D), ventral (B, E) and lateral (C, F) views. Scale bars: 0.2 mm.