Chalarus marki Kehlmaier, spec. nov.
Creators: name: Kehlmaier, Christian
name: Assmann, Thorsten
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Pipunculidae
Chalarus
Chalarus marki

description: Chalarus marki Kehlmaier spec. nov.
(Figs 12, 23, 26, 30, 68–69)
Type material: Germany: Saxony, Dresden, Dresdner Heide, Prießnitztal, 13°46’E 51°05’N, 160m, handnet: 1ɗ (holotype), 26.VI.2006, Kehlmaier (MTD); 1Ψ (allotype), 21. VI.2005, Kehlmaier (MTD); 1ɗ, 8.VI.2003, DNA CK 61, Kehlmaier (MTD); 1ɗ, 8.VI.2003, Kehlmaier (PCCK); 1ɗ 1Ψ, 21. VI.2005, DNA CK 67 (ɗ), DNA CK 31 (Ψ), Kehlmaier (MTD); 3ɗ, 21. VI.2005, Kehlmaier (PCCK); 1ɗ, 23. VI.2005, DNA CK 60, Kehlmaier (MTD); Poland: BiałowieŻa National Park, canopy fogging: 2ɗ, 28.VI.2001, Picea abies primeval forest, B11, Floren (ZSM); 1Ψ, 28.VI.2001, Quercus robur primeval forest, B10, Floren (ZSM); 1ɗ, 28.VI.2001, Quercus robur primeval forest, B12; 1ɗ, 8.VII.2001, Quercus robur 30years, B66, Floren (ZSM); 1ɗ, 8.VII.2001, Quercus robur 30years, B69, Floren (ZSM); 1Ψ, 8.VII.2001, Picea abies 8 years, 74, Floren (ZSM).
Additional material: Great Britain: Barton Mills: 1Ψ, 18.VI.1932, Jenkinson, (UMO).
Etymology: The species is dedicated to Mark Jervis (Cardiff) who greatly contributed towards the taxonomic and ecological knowledge of the genus.
Differential diagnosis: A rather large and very dark species of Chalarus with up to 8 long hairs on anepimeron. Males can be identified via their genitalia with a peculiar phallic structure (Fig. 12, only 1 long and broadened phallic process, tip of distiphallus pointed), distally broadened surstyli (Fig. 30) and inner gonopod (Fig. 26) and a small and linear ejaculatory apodeme (Fig. 23). Females have a broad frons (J92 Fig. 4 A), weakly enlarged ommatidial facets, short pulvilli and a uniquely shaped ovipositor (Figs 68–69). See Table 1 for coxI and ITS2 barcode sequence accession numbers.
Male: Body length. 3.2–3.5mm. Head. Face black, silver-grey pollinose. Labellum and palps light brown, the latter with 2 distal hairs on each. Eyes separated, ommatidial facets very slightly enlarged towards the front. Frons black, silver-grey pollinose in lower quarter. At its narrowest point width of 2.5 accompanying ommatidial facets. Antenna dark brown. Pedicel with 3–4 upper and 4–5 lower bristles, 2–3 of the latter longer than flagellum, which is of an ovoid-kidney shape and is slightly longer than wide. Vertex black. Ocellar triangle with 1 pair of long and 4–5 pairs of shorter ocellar bristles. Occiput black, hardly visible in lateral view. Thorax. Uniformly dark brown to black with black hairs. Pollinosity not assessable (alcohol material). Prescutum and scutum covered with rather widely spaced hairs, the longest ones towards the lateral and posterior margins (notopleural, supraalar and postalar bristles). Scutellum with 2 pairs of long black marginal bristles, dorsally with three pairs of short hairs. Pleura bare except anepimeron with 7–8 hairs. Wing and halter.
Length: 3.1–3.4mm. LW:MWW=3.0–3.1. Wing surface with distinct brownish tinge and covered with microtrichia except near base. Pterostigma brown and incomplete (LS:LTC~0.7). LSC:LTC:LFC~7.0:4.7:1.0. Halter dark brown with stem narrowly witish. Leg. Entirely dark brown except some paler patches. All hairs dark brown: psr ~16 hairs; pvsr ~21 hairs, apical ones extending slightly beyond apex; aasr ~9 hairs, apical ones extending as far as apex; pdsr ~5 hairs, apical ones not extending to apex; ppsr ~3 hairs. Pulvilli slightly shorter than distitarsus. Abdomen. Entirely dark brown. All hairs dark brown, dorsally and ventrally sparse and short, long and dense along lateral margins. LT35:WT2~1.0. Genitalia. Surstyli symmetrical, in lateral view distally broadened (Fig. 30). Gonopods symmetrical, inner gonopod broadened in distal half (Fig. 26). Phallus (Fig. 12) with shaft gently bent. Tip of distiphallus long and pointed. Lmtdp:Ltdp~2.0 or slightly more. Only one broadened phallic process present, which is visible without dissection, pointing towards inner gonopod/surstylus at an angle of approx. 90° towards the membranous tip of the distiphallus and is distincly longer than the latter (Fig. 12). All three ejaculatory ducts placed distally on membranous tip of distiphallus. Ejaculatory apodeme small and linear (Fig. 23).
Female differs from male in the following: Body length 3.3–3.4mm. Wing length: 3.1–3.2mm. Halter with whitish knob. Bristles of pedicel shorter, none longer than flagellum. Frontal facets more enlarged than in male but compared to females of other taxa, still only slightly (0.02mm) (J92 Fig. 4 A, as C. holosericeus). Frons broad, at narrowest point 3 times largest facet. Frons with pairs of fronto-orbital setae in upper two thirds. psr with shorter hairs. Tergites 2–5 laterally with shorter hairs. Ovipositor (Figs 68–69) rather short but with large base (tergite 7) which is oval in dorsal and lateral view, entirely covered with weak pollinosity. In lateral view piercer with tergite 9 about as long as base, thin in distal half and straight overall.
Annotations: Type specimens are currently kept in absolute ethanol. Jervis (1992) redescribed and drew figures of the female under the name C. holosericeus. The non-type female from Great Britain is cited by Jervis (1992) as female C. holosericeus. It was excluded from the type series because its ovipositor is spattered with gold and the tip of tergite 9 is broken off. The second female mentioned in Jervis (1992) from UMO (Suffolk, Newmarket) was studied and belongs to C. indistinctus.
description: Published as part of Kehlmaier, Christian & Assmann, Thorsten, 2008, The European species of Chalarus Walker, 1834 revisited (Diptera: Pipunculidae), pp. 1-39 in Zootaxa 1936 on pages 9-12, DOI: 10.5281/zenodo.184950