Allograpta jacqi Mengual & Ramage, 2018

Ramage, Thibault, Charlat, Sylvain & Mengual, Ximo, 2018, Flower flies (Diptera, Syrphidae) of French Polynesia, with the description of two new species, European Journal of Taxonomy 448, pp. 1-37 : 10-11

Allograpta jacqi Mengual & Ramage sp. nov.

urn:lsid:zoobank.org:act:C4A54CF7-0C6F-4630-9B6E-E5A191322151

Figs 2B , 3 C–D, 6 C–E, 8 D–F

Differential diagnosis

Species with face medially black, yellow laterally, scutum and scutellum black, and abdomen black with lateral small yellow maculae on terga 1–5. Easy to distinguish from other species of Allograpta by the general dark coloration.

Etymology

The specific epithet refers to the family name of the first collector of the species, Fred Jacq, a great naturalist and photographer. The species epithet is to be treated as a noun in the genitive case.

Material examined

Holotype FRENCH POLYNESIA: ♂, Tahiti Island, Mont Marau , 1400 m a.s.l., 17°36′44.02″ S, 149°31′51.10″ W, genitalia in microvial, “FRENCH POLYNESIA: // Society Islands, Tahiti, // Mont Marau, 1400 m., // 27.VIII.2017. // Leg. T. Ramage & F. Jacq // PF1494”, “DNA voucher specimen // ZFMK Lab code // JH13 // Bonn, Germany”, “ZFMK-DIP // 00026906” [barcode], “HOLOTYPE // Allograpta // jacqi // Det. X. Mengual 2017 ” [red] ( ZFMK).

Description

Male

LENGTH (N = 1). Body 10.5 mm; wing 9.0 mm.

HEAD ( Figs 3D , 6C, E ). Face with a distinct tubercle, shiny, yellow with a medial broad black vitta, which does not reach oral margin, and two small black maculae on eye margin, yellow pilose with some black pile laterally and dorsally; gena black; lunule black; frons shiny black, with two small yellow maculae on eye margin at level of antennal insertion, black pilose; vertical triangle black, black pilose; antenna dark, black pilose; arista bare; eye bare, holoptic; occiput dark, covered with thick silver pollinosity on ventral ¾, silver-white pilose on ventral ¾ and black pilose on dorsal ¼.

THORAX ( Figs 2B , 3C , 6 C–D). Scutum shiny, black with small yellow markings on posterior notopleuron and posterior postpronotum, with relatively long yellow pile with some abundant black pile; scutellum shiny black with long yellow and black pile, subscutellar fringe with long dark pile. Pleuron black, except posterior anepisternum yellow on posterior ½ and katatergum with a yellow macula, mostly shiny with some pale pollinosity anteriorly, yellow pilose; metaepisternum bare; metasternum with long yellow pile; calypter pale basally, darker apically, with dark pile; plumula long, yellow; halter yellow; posterior spiracular fringes yellow.

WING. Infuscated, brownish, microtrichose, except cell c bare on basal ¼, cell r1 bare before bifurcation, cells r and bm bare on basal ½, cell cup bare on basal ¼–½. Alula bare on basal ½.

LEGS. Coxae and metatrochanters dark; pro- and mesofemora yellow with a dorsal dark area; pro- and mesotibiae yellow with a medial dark annulus; pro- and mesotarsi black; metaleg black; black pilose with some yellow pile on metacoxa.

ABDOMEN ( Figs 2B , 6D ). Parallel-sided, unmargined. Entirely black, except tergum 1 yellow laterally and terga 2–5 black with small triangular yellow maculae close to lateral margin, shiny except terga 2–4 with a large black pollinose area medially, mostly black pilose except tergum 1 yellow pilose laterally, and terga 2 and 3 yellow pilose anterolaterally; sterna black, yellow and black pilose.

MALE GENITALIA. Small, as in Fig. 8 D–F.

Female

Unknown.

Geographical distribution

Species only known from Tahiti ( French Polynesia).

Status in French Polynesia

Endemic.

Flowers visited

No records.

Genetics

The GenBank accession numbers for this species are: 28S gene ( MH282901 ), protein-coding COI gene ( MH282896 ).

Remarks

This is a singular species due to its body coloration, without the common yellow fasciae of other species of the genus Allograpta and the with scutellum entirely shiny black. The Australian species of this genus were reviewed by Mengual & Thompson (2015), but a broader systematic revision is needed for the Australasian and Oceanian Regions (see Mengual et al. 2009).

Figures

Fig. 2. A. Allograpta amphotera (Bezzi, 1928), holotype, ♂, dorsal view. B. Allograpta jacqui Mengual & Ramage sp. nov., holotype, ♂ (ZFMK-DIP-00019707), dorsal view. C. Allograpta nigripilosa (Hull, 1944), ♂, dorsal view (photograph by F. Jacq). D. Ischiodon scutellaris (Fabricius, 1805), ♂ (ZFMK- DIP-00019713), dorsal view. Scale bars = 1 mm.

Fig. 3. A–B. Allograpta amphotera (Bezzi, 1928), holotype, ♂. A. Lateral view. B. Frontal view. C–D. Allograpta jacqui Mengual & Ramage sp. nov., holotype, ♂, (ZFMK-DIP-00026906). C. Lateral view. D. Frontal view. E–F. A. nigripilosa (Hull, 1944), ♂ (photographs by F. Jacq). E. Lateral view. F. Frontal view. G–H. Ischiodon scutellaris (Fabricius, 1805), ♂ (ZFMK-DIP-00019713). G. Lateral view. H. Frontal view. Scale bars = 1 mm.

Fig. 6. A. Ischiodon scutellaris (Fabricius, 1805), ♂ (ZFMK-DIP-00019713), metacoxa and metatrochanter. Arrow indicates the ventral spine-like process. B. Simosyrphus grandicornis (Macquart, 1842), ♂ (ZFMK-DIP-00019736), metacoxa and metatrochanter. C–E. Allograpta jacqui Mengual & Ramage sp. nov., holotype ♂ (ZFMK-DIP-00026906). C. Lateral view. D. Dorsal view. E. Frontal view. F–G. Melanostoma polynesiotes Mengual & Ramage sp. nov., paratype, ♂ (ZFMK-DIP-00026902). F. Dorsolateral view. G. Lateral view. Scale bars = 0.5 mm.

Fig. 8. A, C. Melanostoma apicale Bigot, 1884, ♀ (ZFMK-DIP-00019781). A. Posterior view. C. Head, frontal view. B. Melanostoma univittatum (Wiedemann, 1824), ♀ (ZFMK-DIP-00019740), head, frontal view. D–F. Allograpta jacqui Mengual & Ramage sp. nov., holotype, ♂ (ZFMK-DIP-00019707), genitalia. D. Epandrium with surstylus and cercus, lateral view. E. Hypandrium, lateral view. F. Hypandrium, ventral view. Scale bars: A–C = 1 mm; D–F = 0.5 mm.