Melanostoma polynesiotes Mengual & Ramage

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: 15-18

publication ID

https://doi.org/10.5852/ejt.2018.448

publication LSID

lsid:zoobank.org:pub:413AE92E-862A-4879-B72F-1C0DCF1F7240

DOI

http://doi.org/10.5281/zenodo.3815657

persistent identifier

http://treatment.plazi.org/id/FA02BC3C-C96B-FFA9-9685-FD624D000339

treatment provided by

Valdenar

scientific name

Melanostoma polynesiotes Mengual & Ramage
status

sp. nov.

Melanostoma polynesiotes Mengual & Ramage  sp. nov.

urn:lsid:zoobank.org:act:C80A600A-2ACE-4BBC-8B3F-D87A6878EA34

Figs 4AView Fig, C–D, 6View Fig F–G, 9View Fig D–F

Differential diagnosis

Species with face entirely black ( Fig. 4CView Fig), scutum and scutellum black ( Fig. 4AView Fig), and metasternum greatly reduced, with deep posterior incision on each side (typical metasternum for this genus). Easy to distinguish from other species in French Polynesia by its overall black coloration.

Etymology

The specific epithet polynesiotes  refers to the country where this species occurs, French Polynesia, and it means ‘belonging to, pertaining to’ in Greek. The specific epithet is to be treated as a noun in apposition.

Material examined

Holotype

FRENCH POLYNESIA: ♂, Tahiti Island , Tahiti Iti, Mount Te Atara Trail, 825 m a.s.l., 17°47′22.50″ S, 149°14′53.91″ W, genitalia in microvial, “ FRENCH POLYNESIA: //GoogleMaps  Tahiti, Tahiti iti – sentier vers // le Mt Atara, 20.IX.2012, sweeping, // 17°47′22.50″ S, 149°14′53.91″ W // 825 m. Leg.: T. Ramage // PF_922”, “DNA voucher specimen // ZFMK Lab code // D269 // Bonn, Germany”, “ZFMK-DIP // 00019707” [barcode] “ HOLOTYPE // Melanostoma  // polynesiotes  // Det. X. Mengual 2016 ” [red] ( MNHN).GoogleMaps 

Paratypes

FRENCH POLYNESIA: Society Islands: 1 ♀, Tahiti, Mount Marau, 17°36′08″ S, 149°33′42″ W, 970 m a.s.l., 31 Mar. 2007, Malaise trap, E. Clardige leg. ( ZFMK: symbiocode_04430, ZFMK-DIP-00046220); 1 ♂, Tahiti, Mount Marau, 17°36′32.2″ S, 149°32′26.8″W, 1340 m a.s.l., 11 Jun. 2007, S. Charlat leg. ( SCL: symbiocode_02320, completely destroyed during DNA extraction); 1 ♂, Tahiti, Tahiti Iti, Mount Te Atara Trail, 17°47′26.55″ S, 149°14′48.62″ W, 815 m a.s.l., 20 Sep. 2012, T. Ramage leg. ( ZFMK: ZFMK-DIP-00019706); 1 ♂, Tahiti, Mont Marau, 1400 m a.s.l., 27 Aug. 2017, T. Ramage and F. Jacq leg. ( ZFMK: ZFMK-DIP-00026902); 1 ♀, Tahiti, Papenoo Valley, Te Faaiti Natural Park, 17°35′34.96″ S, 149°26′32.37″ W, 296 m a.s.l., Malaise trap, 13 Mar. 2018, F. Jacq leg. ( ZFMK: ZFMK-DIP-00040465).

Description

Male

LENGTH (N = 1). Body 9.4 mm; wing 7.0 mm.

HEAD ( Fig. 4DView Fig). Face almost straight, with a small facial tubercle that seems medially divided, black, yellow pilose, white-silver pollinose; gena black, shiny; lunule dark, a bit paler than frons; frons shiny black, slightly pale pollinose basolaterally, pale pilose; vertical triangle black, black pilose; scape and pedicel brown, paler than basoflagellomere, black pilose; basoflagellomere black; arista brown basally, darkening apically, pubescent with pile shorter than arista width; eye bare, holoptic; occiput black, pale pollinose, yellow pilose on ventral ¾ and dark pilose on dorsal ¼.

THORAX ( Figs 4A, CView Fig, 6FView Fig). Scutum black, mostly shiny, pale pollinose anteriorly until notopleuron, with erected, relatively long yellow pile; postalar callus a bit lighter, tawny; scutellum black with erected yellow pile, subscutellar fringe with yellow pile. Pleuron black, mostly pale pollinose, yellow pilose; metasternum bare, reduced, with deep anterior incision on each side; calypter yellow; plumula yellow; halter yellow; posterior spiracular fringes yellow.

WING. Hyaline, entirely microtrichose, except cell c basally bare.

LEGS. Coxae dark; metatrochanters pale; femora black with basal and apical apices yellow; pro- and mesotibia yellow with a medial dark annulus; pro- and mesotarsomeres yellow; metatibia dark with basal 1/5 yellow; metatarsomeres dark.

ABDOMEN. Parallel-sided, unmargined, entirely black. Terga 2–5 black pilose medially and yellow pilose laterally; sterna dark.

MALE GENITALIA. Enlarged ( Fig. 4GView Fig); surstylus tapers to slender acute apex, curved towards dorsal part; superior lobes (postgonites) elongated, with rounded apex, with a spur-like process medially on the ventral margin and another spur-like process dorsally pointed anteriorly; hypandrium with two arms ending with two spur-like processes (one small and one larger); phallus one-segmented, distiphallus with two spur-like processes on each side, one pointed dorsally, the other pointed ventrally ( Fig. 9View Fig D–F).

Female

Similar to male except for normal sexual dimorphism and as follows: frons shiny black, with pale pollinosity along eye margin on ventral ½ between antennae and anterior ocellus; postalar callus black; sternum 2 dark on anterior ½ and pale on posterior ½.

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 ( MF446466View Materials, specimen ZFMK- DIP-00019707), 18S gene ( MF446421View Materials, specimen ZFMK-DIP-00019707), protein-coding COI gene ( MF446515View Materials, specimen ZFMK-DIP-00019707; MF446522View Materials, specimen ZFMK-DIP-00019706). The BOLD Process IDs for the DNA barcodes (5′–COI) for this species are: SYC2242-14 (= KX054855View Materials, specimen symbiocode_02320), and SYC4350-14 (= KX054856View Materials, specimen symbiocode_04430). The Barcode Index Number (BIN) for these specimens is BOLD:ACN3906 (https://doi.org/10.5883/BOLD:ACN3906).

References

Ramage et al. 2017 (as Syrphidae  , unknown; symbiocode_02320 and symbiocode_04430).

Remarks

A singular species due to its coloration, found at relatively high altitudes on Tahiti (Society Islands). A male paratype (symbiocode_02320) was completely destroyed during the DNA extraction and only its DNA template remains in the Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, France.

Species of the genus Melanostoma Schiner, 1860  occur in all biogeographic regions except the Neotropics. This new species differs from the other species of Melanostoma  in the Australasian and Oceanian Regions, namely M. univittatum (Wiedemann, 1824)  , M. apicale Bigot, 1884  , M. fasciatum (Macquart, 1850)  and M. fumivenosum Doesburg, 1966  , by the dark body coloration, very small facial tubercle and distinct male genitalia ( Burt & Mengual 2018). Below we provide a key to the species of Melanostoma  in the Australasian and Oceanian Regions.

MNHN

Museum National d'Histoire Naturelle

ZFMK

Zoologisches Forschungsmuseum Alexander Koenig

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Syrphidae

Genus

Melanostoma

Loc

Melanostoma polynesiotes Mengual & Ramage

Ramage, Thibault, Charlat, Sylvain & Mengual, Ximo 2018
2018
Loc

Syrphidae

Latreille 1802
1802