Tomosvaryella osito Kehlmaier, Gibbs & Withers, 2019

Kehlmaier, Christian, Gibbs, David J. & Withers, Phil, 2019, New records of big-headed flies (Diptera: Pipunculidae) from the Mediterranean Basin, Bonn zoological Bulletin 68 (1), pp. 31-60 : 35-37

Tomosvaryella osito Kehlmaier, Gibbs & Withers sp. n.

urn:lsid:zoobank.org:act:2FDE06C2-3AB5-42C7-937B-AC7508CD3334

Figs 1A–B , 3A–G

Differential diagnosis. The new species is unique within Tomosvaryella Aczél, 1939 for its pilose appearance in both sexes ( Figs 1A–B ). Based on the male terminalia, T. osito sp. n. belongs to the minima species group that comprise T. minima (Becker, 1897) , T. hortobagyiensis Földvári & De Meyer, 2000 , T. resurgens De Meyer (1997) , and T. sepulta De Meyer (1997) . The latter two species were originally described from mainland Spain and the shape of the surstyli resembles especially to T. sepulta . However, the lateral shape of both surstyli is distinctly more angular in T. osito sp. n. ( Figs 3A and 3C ) compared to T. sepulta . ( De Meyer 1997: figs 12a and 12c).

Description. MALE. Body length: 4.0 mm (prior to dissection). Head. Scape and pedicel dark brown, the latter with some minute dorsal and ventral bristles. Flagellum yellowish brown and long tapering. Arista with yellowish broadened base, otherwise dark brown. Eyes meeting for less then length of ocellar triangle (four facets). Frons and face densely silver pollinose. Palpus yellowish. Laterally, occiput silver pollinose with some weak brownish pollinosity intermingled in anterior half; upper half twice as broad as lower half. Thorax. Postpronotal lobe yellow, densely silver pollinose, with about twelve long hairs. Prescutum and scutum black, weakly silver pollinose, covered with long white hairs along anterior and lateral margins and with two dorsocentral rows that broaden considerably in posterior third. Scutellum black, densely silver pollinose and entirely covered with long white hairs. Subscutellum black and densely silver pollinose. Pleura black, bare, weakly silver pollinose. Wing length: 3.8 mm; width: 1.1 mm. Length of third costal section (LTC) 0.3 times length of fourth costal section (LFC). Pterostigma absent. Wing covered with microtrichia except partly bare in small basal cells, e.g., bc, and beginning of cells sc, c, r 1, br and bm. Crossvein r-m reaches cell dm shortly after the middle of the cell′s length. Hal- ter narrowly brown at base, otherwise white. Legs dark brown except yellow at tip of femur and in basal quarter of tibia; silver pollinose except hind femur shining posteroventrally. Hind trochanter without any distinct protuberance or spines. Femora without ventral spines, with posterodorsal and posteroventral row of white hairs, complemented by an anterior row on hind femur. Hind basitarsus flattened. Pulvilli slightly shorter than disti- tarsus. Abdomen. Tergites black, shining but with anterolateral triangular patches of grey pollinosity; evenly covered with long white hairs ( Figs 1A–B ). Viewed caudally, membranous area placed to the right ( Fig. 3E ). Genitalia: Surstyli in strictly dorsal view rather symmetric, left one slightly longer; both with broad base and inward bent tips ( Fig. 3B ). In lateral view, both surstyli are hunchbacked and bent towards sternites ( Figs 3A & C ). Epandrium elongated, longer than surstyli ( Fig. 3B ). Phallus with three short ejaculatory ducts; one duct baring five distinct spines pointing towards the phallic guide ( Fig. 3D ). Phallic guide inconspicuous, rather long and slim with a slight curve towards the epandrium in lateral view ( Fig. 3D ). FEMALE. Body length: 3.7 mm. Differing from male by eyes separated, with enlarged anterior facets. Frons entirely silver pollinose except in upper quarter, broadest in its middle, five times wider than largest ommatidial facet. Occiput silver pollinose in lower, weakly silver pollinose in upper half. Pleura densely silver pollinose. Wing length: 3.4–3.5 mm. Wing width: 1.1–1.2 mm. LTC 0.5 times LFC. Leg densely silver pollinose. Anterior femur with two white bristles at base. Tibiae yellow in basal third. Pulvilli as long as distitarsus. Tergite 1–6 laterally silver pollinose, broadest towards anterior margin. Genitalia: Ovipositor in dorsal view ( Fig. 3G ) with base (tergite 7) dark brown, ovate, longer than broad, weakly silver pollinose. Piercer with tergite 8 (around anal opening) dark brown and shining; tergite 9 (the actual piercer) thin, yellowish, shining. Piercer twice length of base. In lateral view ( Fig. 3F ), piercer straight, reaching posterior margin of sternite 3.

Type material. HOLOTYPE ♂, SPAIN: Mallorca , S’Albufera, Es Comú, 39°46′34′′N 3°08′27′′E, 20.v.2007, D.J. Gibbs [ SMTD] . PARATYPES: same data as holotype [1♂ (dissected), 2♀♀, PCDG] ; same data as holo- type [1♂, BMNH (not dissected); 2♂♂, OUMNH (not dissected)] ; same data as holotype [1♀, PCDG; 1♀, BMNH; 1♀, OUMNH] ; same data as holotype, 18.v.2007 [1♂, PCDG; 1♂ 1♀, BMNH (not dissected)] . FRANCE: Aude, Narbonne, Gruissan, dunes à Tamarix , 13.vi.2006, B. Nusillard [1♂, PCPW] .

Etymology. The species epithet osito is Spanish for ‘little bear’ and refers to the Teddybear-like appearance of the new species. The specific epithet is to be treated as a noun in apposition.

Figures

Fig. 1. Male holotype of Tomosvaryella osito Kehlmaier, Gibbs & Withers sp. n. prior to dissection. A. Left lateral view. B. Dorsal view.

Fig. 3. Tomosvaryella osito Kehlmaier, Gibbs & Withers sp. n. A. Lateral view of right surstylus. B. Strictly dorsal view of surstyli. C. Lateral view of left surstylus. D. Right lateral view of phallus and phallic guide. E. Caudal view of syntergosternite 8. F. Right lateral view of ovipositor. G. Dorsal view of ovipositor.