Drosophila nigrospinipes, Grimaldi & Jones, 2020

Grimaldi, David A. & Jones, Lance E., 2020, A Revision of the Drosophila spinipes Species Group (Diptera: Drosophilidae), Zootaxa 4809 (1), pp. 1-28 : 18

Drosophila nigrospinipes , new species

Figs. 2C , 3C , 4D , 5D , 8 C–D, 9F, 10H, 11F, 12I

LSID urn:lsid:zoobank.org:act:C8D7333D-8686-47A7-9E8C-C79CD55AAE56

Diagnosis: One of the two obvious species in the spinipes group, only one with a dark pleura, including the katepisternum; protarsal spines unique, all nearly equal in size; apex of abdomen dark (including epandrium), hypandrium nearly square, aedeagus thick, short, with ventral extension and fine scales medially, no lateral serrations.

Description: Body coloration mostly typical of group but with unique distinctions, i.e., katepisternum and meron same dark brownish-black as dorsum, but with faint pollinosity (the small katatergite and laterotergite are lighter). Protarsomere 1 and 2 nearly equal in length, each with 4 spines, all nearly equal in length and width except for no. 6 (on tarsomere 1), which is approximately 1.25x the size of others; spines 2, 4, 5, and 7 not reduced in size. Male terminalia: Surstylus with typical array of ca. 16 spine-like prensisetae, including 2 large dorsalmost ones that point inward. Subepandrial sclerite large, boat-shaped, with narrow anterior arms. Hypandrium approximately rectangular; length of aedeagus + aedeagal apodeme less than total length of hypandrium. Postgonite flat, not lobate; hypandrial lobes each with setula. Aedeagus distinctive: in dorsoventral view distiphallus broadened, width slightly greater than shaft, labiate; with fine medial scales (not spicules), with minute serrations dorsoapically; in lateral view distiphallus hoodlike, extended ventrally into a lobe, length of phallus approximately same length as aedeagal apodeme. Female unknown. Measurements: HS12, HS24: Head: HD/HW 0.77; FL/LFW 1.23; VB2/VB1 0.87; EW/ED 0.69; OR2/OR1 0.97 (0.94–1.00); OR3/OR1 1.08 (1.05–1.12); OC/POC 1.67 (1.63–1.72); FW/FD 0.51; ODB/ODA 0.39 (0.37–0.41). Thorax: ThL 1.02 mm. (0.99–1.04); UPS/LHS 0.79 (0.75–0.84); LHS/ThL 0.24; ADC/PDC 0.45 (0.42–0.48); AKE/PKE 0.56 (0.51–0.62); LF1/LF2 0.81.

Holotype: Male, HS-24 “ Kenya, Kericho, 10.XI.83, A. Freidberg. ” Minute double-mounted, genitalia dissected by DG; in TAU.

Other Specimens: Paratype, Male HS-12, “ Kenya, Tartar 30 km N. Kitale, 4–5.XI.83, A. Freidberg. ” Minuten double-mounted, genitalia not dissected; in TAU .

Etymology: “Black spinipes,” in reference to the dark pleura.

Figures

FIGURE 2. Distinct or apomorphic features of the Drosophila spinipes species group. A. Lateral view, sp. C (HS-13). B. Same as A, with detail of mouthparts. C. D. nigrospinipes n. sp. (HS-12), dorsolateral view of thorax, showing setal tubercles and spiracular channel. D. Wing, D. malagasy n. sp. (HS-21). Arrow indicates end of dense costal spinules. E-F. SEM of protarsal spines, mesal view of specimen HS-14 (sp. B). Note the shallow longitudinal grooves.

FIGURE 3. Lateral and dorsal habitus of several Drosophila spinipes-group species. A. D. freidbergi n. sp. (HS-06). B. D. malagasy n. sp. (HS-18). C. D. nigrospinipes n. sp. (HS-24). D. D. phalloserra n. sp. (HS-08). E. Dorsal thorax, sp. C (HS-13). F. D. spinipes Lamb (NHMUK 014335955), dorsum. G. D. spinipes Lamb (NHMUK 014335956), lateral.

FIGURE 4. Photomicrographs, dorsolateral view, of the abdomen of several Drosophila spinipes-group species. A-C. D. malagasy n. sp. A.HS-16. B. HS-22. C. HS-18. D. D. nigrospinipes n. sp. (HS-24). E. D. phalloserra n. sp. (HS-07). F. D. suma Burla (HS-01). G. D. spinipes Lamb (NHMUK 014335955).

FIGURE 5. Protarsi of representative species in the Drosophila spinipes group, mesolateral view. Homologous spines are numbered (note spine 7 missing in D. malagasy specimen HS-20 [B], presence of supernumerary spine 3a in D. jambiya). A. D. jambiya n. sp. (HS-39). B. D. malagasy n. sp. (HS-20). C. D. malagasy n. sp. (HS-22). D. D. nigrospinipes n. sp. (HS-24). E. D. phalloserra n. sp. (HS-07). F. D. spinipes Lamb (NHMUK 014335956). G. sp. D (HS-03). All to the same scale.

FIGURE 8. Male reproductive structures of epandrium and surstyli of representative species of the Drosophila spinipes group, all to the same scale. A. D. hypandrilata n. sp. (HS-38). B. D. malagasy n. sp. (HS-22). C–D. D. nigrospinipes n. sp. (HS-24). E. D. phalloserra n. sp. (HS-08). F. D. suma Burla (HS-01). G. sp. D (HS-03).