Macrobinthus mamai, Tan & Robillard, 2021

Tan, Ming Kai & Robillard, Tony, 2021, New taxa of the subtribe Lebinthina (Orthoptera: Gryllidae: Eneopterinae Lebinthini) from New Guinea and nearby islands, Zootaxa 5082 (6), pp. 583-599 : 592-594

Macrobinthus mamai sp. nov.

Figs 6E–G , 7 , 8

Material examined. Holotype: PAPUA NEW GUINEA • ♂; Central Province , east of Port Glasgow, Mamai plantation; 150 m. a.s.l.; 6 February 1965; R. Straatman leg.; light trap; molecular sample L175 ( BPBM).

Type locality. PAPUA NEW GUINEA, Central Province , east of Port Glasgow

Etymology. This species is named after its type locality, Mamai plantation; noun in apposition.

Diagnosis. The new species differs from other species of the genus by shape of head, with smaller, more rounded eyes, face with a median whitish area. It is most similar to Macrobinthus kutini Robillard & Su, 2018 in the shape of the male genitalia, including shape of posterior pseudepiphallic lophi and pseudepiphallic parameres, but differs by a more elongated pseudepiphallus, with posterior end wider and truncated between the lophi. It is also similar to Macrobinthus jharnae (Bhowmik, 1981) in the elongated pseudepiphallus, but differs by shape of pseudepiphallic parameres and posterior end of pseudepiphallus between the lophi. It also differs from Macrobinthus wilhelmsis Robillard & Dong, 2016 by its larger size and by male genitalia having pseudepiphallus with paired lophi at posterior apex. It differs from Macrobinthus kei sp. nov. by the more elongated pseudepiphallus, less rounded pseudepiphallic lophi and ventral lobe of pseudepiphallic parameres with long tapering anterior process. It also differs from Macrobinthus wilhelmsis Robillard & Dong, 2016 by pseudepiphallus with paired lophi at posterior apex.

Description. Size average for the genus ( Fig. 7 ). Eyes relatively small, rounded dorsally and located anteriorly on head. Vertex and fastigium dark brown. Dorsum of head with two faint narrow longitudinal pale bands in the middle ( Fig. 8A ); back of eyes with a narrow yellow band. Scapes mostly brown. Antennae orange brown. Face with a wide whitish-grey median area, dark brown laterally. Fastigium verticis dark brown with cream-coloured spots laterally ( Fig. 8B ). Mouth parts brown and grey, clypeus and mandibles whitish mottled with cream colour; maxillary palpi with segments yellow brown, slightly darker at apices ( Fig. 8B ). Pronotum dorsal disk dark brown mottled with yellow, anterior margin faintly concave and yellow; lateral lobes darker brown than dorsal disk ( Fig. 8C ). Legs: FI–II brown with few faint darker spots, knee areas markedly darker; TI–II dark brown with two faint yellow rings; tarsomeres 1 and 3 of each leg yellow basally then brown; FIII yellow brown with few brown spots; TIII homogeneously brown. Abdomen brown. Cerci light brown with faint apical rings.

Male: FW reaching apex of third tergite, narrow, occupying less than two third of abdomen width. FW colouration ( Fig. 8D ): Dorsal field cells mostly brown, veins yellow brown to cream-coloured; M and R brown. Lateral field cells brown, with ventral region more yellow brown; longitudinal veins brown with cross-veins cream-coloured. FW venation: harp with one main oblique vein faint and angularly sinuous. Mirror corresponding to an elongated d1 cell. Apical field small, including two short cell alignments; apex of dorsal field rounded. Lateral field with 6 straight longitudinal veins; Sc without projections.

Male genitalia ( Figs 6E–G ): Pseudepiphallus triangular, more elongated than M. kei sp. nov., its basal margin rounded and slightly indented in the middle, posterior apex truncated with paired lophi; lophi setose dorsally and ventrally with apices subobtuse. Rami short, about half pseudepiphallus length, slightly converging anteriorly. Pseudepiphallic parameres trilobate; with a ventral lobe sclerotized and inverted pyriform, a wide lateral lobe oriented dorsally with acute apex, and a small and narrow basal lobe. Ectophallic apodemes parallel and long, reaching beyond anterior margin of pseudepiphallic sclerite. Ectophallic arc transverse. Ectophallic fold with two narrow ventral sclerites more or less parallel and diverging each other posteriorly, barely surpassing bases of pseudepiphallic lophi. Endophallic sclerite narrowly Y-shaped, comprising a long anterior region and a short median expansion with subacute apex and stout, lobular lateral arms posteriorly not surpassing median expansion. Endophallic apodeme with lateral lamellae.

Female: Unknown.

Measurements (in mm). Male holotype PronL = 4.1, PronW = 6.7, FWL = 6.6, FWW = 4.7, FIIIL = 16.4, FIIIW = 6.2, TIIIL = 16.5.

Figures

FIGURE 6. Macrobinthus genitalia. Macrobinthus kei sp. nov. male genitalia in dorsal (A), ventral (B) and lateral (C) views, and female genitalia in ventral view (D); Macrobinthus mamai sp. nov. male genitalia in dorsal (E), ventral (F) and lateral (G) views. Scale bars = 1 mm (all except D); 0.5 mm (D).

FIGURE 7. Macrobinthus mamai sp. nov. male holotype in dorsal (A) and lateral (B) views. Scale bar = 10 mm.

FIGURE 8. Macrobinthus mamai sp. nov. morphology. Head dorsum in dorsal view (A); face in anterior view (B); head, pronotum and FWs in lateral view (C); male FW in dorsal view (D). Scale bar = 1 mm.