Robusatgramma grenadense Cui and Marshall, 2005

Marshall, Stephen A. & Cui, Yongsheng, 2005, Systematics of Robustagramma, a new genus of New World Sphaeroceridae (Diptera), Zootaxa 1026 (1), pp. 1-122 : 75

Robusatgramma grenadense Cui and Marshall , new species

( Figs. 207–213 )

As described for Robustagramma biangulatum except as follows.

Body length 1.3–1.9 mm. Postvertical bristles slightly divergent, ca. 2/3 as long as inner occipital bristle. Postocellar bristles cruciate, over half as long as postvertical bristle. Head height ca. 2.8–3.1 times genal height. Preapical palpal bristles ca. 2.5 times as long as maximum palpal width. One pair of presutural dorsocentral setulae distinctly longer than acrostichal setulae inside. Posterodorsal katepisternal bristle over 4/5 as long as distance between bristle base and wing base. Wing pigmented, but maculation indistinct. Length of second costal sector ca. 0.46–0.48X length of third. Mid femur of male with 8–10 proximal ventral bristles and a distinct row of anteroventral setulae.

Male terminalia: Sternite 5 with two (rarely three) pairs of short, stout bristles. Surstylus with a truncate apex in lateral view. Cercus distinctly longer than surstylus, with distal half narrow in posterior view. Dorsal whip­like sclerite of distiphallus with a small nodule. Ejaculatory apodeme slightly shorter than half length of aedeagal apodeme.

Female terminalia: Two sclerites of sternite 8 indistinct. Tergite 10 with two small bristles, without a posteromedial patch of small setulae. Spermathecae with distal portions similar in length to basal portions. Ducts of paired spermathecae ca. 2.5 times as long as spermatheca.

Holotype (♂, DEBU) and paratypes (5 ♂, 10 ♀, DEBU): GRENADA: St. George , Grand Etang Forest, 12 05 N, 61 42 W, 460m, dung traps, 7–8.x.1995, B. D. Gill.

Other paratypes: GRENADA: Grand Etang Rain Forest, 3.i.1995 (1 ♂, DEBU) ; dung traps, 1–4.i.1995 (1 ♀, DEBU) , S. A. Marshall. Mt. Qua Qua, Grand Etang, 3.i.1995, S. A. Marshall (1 ♀, DEBU) .

Figures

FIGURES 207­213. Robustagramma grenadense sp. nov.: 207, posterior view of male terminalia; 208, lateral view of male terminalia; 209, lateral view of male internal genitalia; 210, male sternite 5; 211, dorsal view of female terminalia; 212, ventral view of female terminalia; 213, spermathecae.