Merodon eumerusi Vujić, Radenković et Likov, 2019

Vujić, Ante, Radenković, Snežana, Likov, Laura, Andrić, Andrijana, Gilasian, Ebrahim & Barkalov, Anatolij, 2019, Two new enigmatic species of the genus Merodon Meigen (Diptera: Syrphidae) from the north-eastern Middle East, Zootaxa 4555 (2), pp. 187-208 : 189-192

publication ID

https://doi.org/ 10.11646/zootaxa.4555.2.2

publication LSID

lsid:zoobank.org:pub:4A19F409-50F3-4916-8429-D459047148A6

DOI

https://doi.org/10.5281/zenodo.5944934

persistent identifier

https://treatment.plazi.org/id/F906E200-AE8B-4351-B5EB-A347D9F35146

taxon LSID

lsid:zoobank.org:act:F906E200-AE8B-4351-B5EB-A347D9F35146

treatment provided by

Plazi

scientific name

Merodon eumerusi Vujić, Radenković et Likov
status

sp. nov.

Merodon eumerusi Vujić, Radenković et Likov sp. n.

Figs 1 View FIGURE 1 A–D, 2, 3, 4A–B, 5, 6A–B, 7A

Type material. HOLOTYPE. Tajikistan, ♂, pinned, in USNM. Original label: “Tadzhik SSR, Khodzha Obigarm, ca 45 km NW Dushanbe, 16 jul 1979, 00036585” . PARATYPES: Tajikistan: 2♂ 2♀, Khatlon Province, Khuroson District, Kishlak Toshbulok , 38° 14'N 68° 43'E, 1–4.vi.2016, leg. Yu. Danilov, A. Barkalov, V. Zinchenko (1♂ determined as Merodon sp.3 by Barkalov, 2017) ( SZMN) GoogleMaps ; 1♂, Ziddy , 39° 03'N 68° 50'E, 17.vii.1979, leg. W.J. Pulawski, 0 0 0 36584 ( USNM) GoogleMaps ; 1♂, Takob , 39° 26'N 68° 16'E, 6.vii.1979, leg. W.J. Pulawski, 0 0 0 36583 ( USNM) GoogleMaps ; 1♂ 1♀, Tabilj Dapa, Petra Pervogo , 1700m, 39° 00'N 71° 00'E, 17.vii.1964, leg. V. Zaitsev ( SZMN) GoogleMaps ; 3♂, Varzob Canyon , 5 km NE Kalon, 39° 05' N 68° 88' E, 07-12.vii.2017, leg. A. Barkalov ( SZMN) ; 3♂, Varzob Canyon , 3 km NE Kalon, 39° 06' N 68° 87' E, 30.vi.2017 (2♂), 05.vii.2017 (1♂), leg. A Barkalov ( SZMN) ; 1♂, Varzob Canyon , 3.5 km NE Kalon, 39° 07' N 68° 84' E, 11.vii.2017, leg. Zinchenko ( SZMN) . Kyrgyzstan: 1♀, Chatkal Valley, Tyan–Shan Mountain , Dzharty–Su, 1550m, 41° 43'N 71° 4'E, 30.vii.1973, leg. D. Žartady ( SZMN) GoogleMaps . Uzbekistan: 1♂ 2♀, Kata–Chimgan , 41° 31'N 70° 01' E, 27.vi.2006, leg. Allan Selin (S. K. coll.) GoogleMaps ; 1♀, Hodzahasmin , 38° 38'N 67° 36' E, 03.vii.2006, leg. Allan Selin (S. K. coll.) GoogleMaps .

Diagnosis. Belongs to Merodon avidus-nigritarsis lineage: relatively large species (11–17 mm) with white pollinose vittae on mesoscutum and white pollinose fasciae on tergites; at least tergite 2 with reddish-orange marks. Mesoscutum covered with erect, yellow pile. Anterior anepisternum bare below the postpronotum. Pile on metasternum erect, as long as those on hind coxa. Abdomen elongate, narrow and tapering, always longer than mesoscutum and scutellum together. Posterior part of mid coxa usually without long pile. First flagellomere at most twice as long as wide. Legs without thorns or other protuberances. Male genitalia: anterior surstyle lobe usually of rhomboid shape, covered with dense short pile; posterior surstyle lobe usually longer than anterior one; interior accessory lobe of posterior surstyle lobe narrow and long; cercus rectangular, without prominences. Hypandrium narrow, elongate and sickle–shaped; posterior end of lateral sclerite of aedeagus tapering; hypandrium usually with a pair of lateral projections; lingula developed. For the subgroups of M. avidus-nigritarsis lineage and the approximate number of taxa see Table 1.

Merodon eumerusi sp. n. possesses a line of thorns on the inner side of apical quarter of metafemur ( Fig. 4B View FIGURE 4 ), representing a unique apomorphic character that is absent in all other species of the genus. Based on the structure of the male genitalia ( Figs 6 View FIGURE 6 A–B, 7A), similar with M. ottomanus Hurkmans ( Figs 6 View FIGURE 6 C–D, 7B). Differs from other known species of the M. avidus-nigritarsis lineage (except M. aurifer Loew ) in having 1–4 fine pile (usually one) on the posterior side of the mesocoxa. In males, the basoflagellomere is elongated with an angular apex ( Fig. 2A View FIGURE 2 ), bearing a very large outer fossette ( Fig. 1B View FIGURE 1 ) and a second inner fossette ( Fig. 1A View FIGURE 1 ), which are absent in all other species of the genus. Medium-sized species (10–12 mm), with a vitta of black pile between wing bases. Terga dark except for triangular reddish-yellow lateral marks on tergum 2. Terga 2–4 with a pair of broad pollinose vittae, almost connected medially on terga 3 and 4 ( Fig. 5A View FIGURE 5 ).

Description. MALE. Head ( Figs 1 View FIGURE 1 A–B, 2A–B). Antenna ( Figs 1 View FIGURE 1 A–B) dark brown; basoflagellomere about 1.4 times longer than pedicel, with acute tip; rectangular, with two fossettes: a large triangular one on the inner side and an oval one on the outer side ( Figs 1 View FIGURE 1 A–B); arista about 1.5 times longer than basoflagellomere. Face and frons black, densely covered with whitish pollinosity and pale pile, except for the upper and lower part of mouth edge and lunula; lateral side of mouth edge with small pollinose macula; face with pollinose vitta without pile, from lower margin of antennae to mouth edge; occiput densely covered with grey pollinosity and pale pile. Eyes covered with pale pile, longer than posterior ocellus. Eye contiguity about 14 facets long. Vertical triangle isosceles, covered with black pile ( Fig. 2A View FIGURE 2 ), shiny, except for grey pollinosity at anterior angle. Ocellar triangle equilateral ( Fig. 2B View FIGURE 2 ). Thorax ( Figs 3 View FIGURE 3 , 4 View FIGURE 4 A–B). Scutum black, with three narrow, central, pollinose vittae and two lateral, broad vittae; transverse suture conspicuously pollinose; scutum covered with pale pile, except for broad fascia of black pile between wing bases (the fascia has intermixed black and pale pile in some specimens) ( Fig. 3 View FIGURE 3 ); notopleural area covered with silverish pollinosity. Scutellum black, shiny, and covered with pale pile about as long as half of the width of scutellum (or longer); posterior margin of scutellum with pronounced rim. Wing hyaline with light brown veins, covered with microtrichia except for the basal parts of cells bm, r and r1; vein RS with a few short pile at the beginning of cell r2+3. Pleuron black and shiny, except for grey pollinosity on anepisternum, anepimeron and anterodorsal part of katepisternum; dorsal part of anterior anepisternum, posterior anepisternum, anterior anepimeron, dorsomedial anepimeron and anteroventral and posterodorsal parts of katepisternum covered with long pale pile, whereas the katatergum is covered with short sand-brown pile. Legs mostly black, except for yellow knees and basal half of tibiae; legs covered with yellow pile, except for a few black bristle-like pile on the apical part of the pro- and mesofemora; metatrochanter with small lamellar process; metafemur swollen and slightly curved, 2.5 times longer than wide; ventral margin of inner side of metafemur with a row of 4–5 robust black thorns, opposite to triangular process at apicoventral part of metafemur; a few slightly longer posteroventral and anteroventral pile on metafemur, shorter than half of the width of metafemur; ventral surface of metafemur with bare line lacking pile ( Figs 4 View FIGURE 4 A–B). Abdomen ( Fig. 5A View FIGURE 5 ). Terga black and shiny, covered with pale pile; tergum 2 with a pair of triangular orange maculae; terga 2–4 with a pair of wide pollinose fasciae, slightly separated at the middle of terga; posterior margins of terga 3–4 with narrow pollinose fasciae (on tergum 2 poorly visible); sterna dark brown, covered with pale pile; posterior margin of sternum 4 simple, straight, without incisions. Male genitalia ( Figs 6 View FIGURE 6 A–B, 7A). Posterior surstyle lobe broad, with bulge on apical part, rectangular; anterior surstyle lobe rectangular, well developed, covered with dense short pile; cercus rectangular ( Figs 6 View FIGURE 6 A–B). Hypandrium Ushaped, with folded thecal ridge; lateral sclerite of aedeagus triangular, knife-shaped ( Fig. 7A View FIGURE 7 ).

FEMALE ( Figs 1 View FIGURE 1 C–D, 2C–D, 5B). Similar to the male except for typical sexual dimorphism and for the following characters: basoflagellomere simple, without angular apex, oval, dark brown or reddish (in some specimens pedicel and scape are lighter brown), about 1.7 times longer than pedicel; outer fossette small, lacking inner fossette ( Fig. 1 View FIGURE 1 C–D); frons shiny, with broad pollinose vittae along eye margins ( Fig. 2D View FIGURE 2 ); metatrochanter oval; terga 3–4 with mixed yellow and black pile, only yellow pile on pollinose fasciae ( Fig. 5B View FIGURE 5 ).

Etymology. This species shares with those of the genus Eumerus the row of thorns along inner side of metafemur. The specific epithet ‘ eumerusi ’ indicates this similarity.

Distribution. Mountain ranges (ca. 1,400–2,500 m a.s.l.) in Tajikistan, Uzbekistan and Kyrgyzstan ( Fig. 16 View FIGURE 16 ).

Morphological characters with potential systematic value. This species possesses two unique characters among all other known Merodon species, which resemble morphological structures in some other genera of the tribe Merodontini ( Azpeytia , Eumerus , Lyneborgimyia , Megatrigon , and Platynochaetus ): 1) a row of thorns on the inner side of metafemur ( Fig. 4B View FIGURE 4 ) in both sexes, which are also present in all species from the genera Eumerus , Lyneborgimyia , Megatrigon and Platynochaetus ; 2) male with large fossette on the outer side ( Fig. 1B View FIGURE 1 ), similar to most species from the genera Eumerus and Megatrigon (but weakly defined in these two genera) ( Fig. 1G View FIGURE 1 ), except for the E. tricolor group (sensu Chroni et al. 2017) that has a rounded centro-apical fossette ( Fig. 1F View FIGURE 1 ); females have a dorsoapical fossette, with a shape similar to most other Merodon taxa ( Figs 1 View FIGURE 1 C–D, 1E).

A unique apomorphic character among all taxa from the tribe Merodontini is the fossette on the inner side of the basoflagellomere in males ( Fig. 1A View FIGURE 1 ).

The presence of 1–4 fine pile (usually one) on the posterior side of the mesocoxa has been reported only in two taxa ( Merodon aurifer and M. eumerusi sp. n.) of the M. avidus-nigritarsis lineage. Other species of this lineage do not have pile on the posterior side of the mesocoxa.

USNM

Smithsonian Institution, National Museum of Natural History

SZMN

Siberian Zoological Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Syrphidae

Genus

Merodon

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