Merodon kawamurae Matsumura, 1916

Vujic, Ante, Likov, Laura, Radenkovic, Snezana, Tubic, Natasa Kocis, Djan, Mihajla, Sebic, Anja, Perez-Banon, Celeste, Barkalov, Anatolij, Hayat, Ruestem, Rojo, Santos, Andric, Andrijana & Stahls, Gunilla, 2020, Revision of the Merodon serrulatus group (Diptera, Syrphidae), ZooKeys 909, pp. 79-158 : 79

Merodon kawamurae Matsumura, 1916 Figs 18D-F , 19E-H , 22A, B , 23E, F

Lampetia micromegas Hervé-Basin, 1929: 111 - syn. published by Hurkmans 1993: 165.

Diagnosis.

Medium sized (7.7-11.2 mm), with olive-brown reflection; antennae reddish brown; body pile predominantly pale, except some black pile on vertex and terga 2-4 medially; basoflagellomere short, ca. 1.2 times as long as wide, with large dorsal to dorsolateral fossette, and short arista (Fig. 19E-H ); tergum 2 with reddish yellow lateral maculae; tergum 3 laterally reddish or brown; metafemur incrassate with long pilosity as long as half of width of metafemur in male and as one third of width of metafemur in female (Fig. 22A, B ); male genitalia: posterior surstyle lobe with small lateral hump (Fig. 18E : bp); apical part of anterior surstyle lobe rhomboid (Fig. 18D : al); lingula large (Fig. 18F : l), lateral sclerite of aedeagus elongated (Fig. 18F : s).

Redescription

(based on the types of Merodon micromegas and additional material from China). Male. Head. Antennae reddish brown; basoflagellomere short, ca. 1.2 times as long as wide, and ca. two times as long as pedicel, straight dorsally with acute apex; dorsal to dorsolateral fossette large; arista reddish brown and thickened at basal one third, covered with dense microtrichia, ca. 1.3 times as long as basoflagellomere (Fig. 19E-G ); face and frons black with gray microtrichia, face covered with dense whitish, and frons with yellowish white pile; lunule shiny black, bare; vertex isosceles, dull, in front of anterior ocellus covered with dense microtrichia; vertex with long, pale yellow pile, in some specimens mixed with black or dark gray pile on the ocellar triangle; ocellar triangle isosceles; eyes covered with dense pile; occiput with gray-yellow pile, ventrally covered with a dense, gray microtrichia; eye contiguity ca. ten facets long; vertical triangle: eye contiguity: frons = 2.5: 1: 2.5.

Thorax. Scutum and scutellum black with bronze luster, covered with dense, erect yellow pile; scutum usually with indistinct microtrichose vittae; posterodorsal part of anterior anepisternum, posterior anepisternum (except anteroventral angle), anterior anepimeron, dorsomedial anepimeron, and posterodorsal and anteroventral parts of katepisternum with long, dense pale yellow pile and grayish microtrichia; wings entirely covered with microtrichia; wing veins reddish brown; calypteres and halteres pale yellow; legs mostly black, except tip of femora and basal part of tibiae and brown tarsi ventrally; pile on legs pale yellow; metafemur incrassate and curved, ca. three times longer than wide; long pile on postero- and anteroventral surface ca. as half of width of metafemur, approximately the same length as pile on dorsal surface (Fig. 22A ).

Abdomen. Broad, tapering, 1.2 times longer than mesonotum; terga dark, except for a pair of reddish yellow, triangular, lateral maculae on tergum 2 (and in some specimen on 3); terga 2-4 each with a pair of white microtrichose, wide, usually oblique fasciae; pile on terga all yellow, except black pile on tergum 3 medially, and on tergum 2 posteriorly and tergum 4 anteriorly in some specimens (Fig. 23E ); sterna dark brown, covered with long whitish yellow pile.

Male genitalia. Apical part of anterior surstyle lobe rhomboid shape, covered with dense, short pile (Fig. 18D : al); posterior surstyle lobe oval with small basolateral protrusion (lateral hump) (Fig. 18E : bp); hypandrium sickle-shaped, without lateral projections; lingula large (Fig. 18F : l); lateral sclerite of aedeagus elongated (Fig. 18F : s).

Female. Similar to the male except for normal sexual dimorphism and for the following characteristics: antennae with rounded tip, fossette dorsolateral (Fig. 19D ); frons microtrichose, covered with mostly gray-yellow pile; ocellar triangle covered with black pile; long pile on postero- and anteroventral surface ca. as half of width of metafemur (Fig. 22B ); microtrichose fasciae on terga 2-4 narrower (Fig. 23F ).

Distribution.

Merodon kawamurae is known from Japan and China (Fig. 7 ). This is the only species of the genus Merodon in eastern Palaearctic.

Ecology.

Preferred environment: no data. Flowers visited: no data. Flight period: April-May.

Type material.

Merodon kawamurae was described after an unknown number of specimens from Kumamoto, Kyushu, Japan, leg. Kawamura. Matsumura’s type material is held at the Hokkaido University, Department for Systematic Entomology, at Sapporo, Japan, but the type material was inaccessible for this study.

Merodon micromegas Lectotype [designated by Hurkmans (1993)]: "Tchen-Kiang, 13.iv.1918 / Lampetia micromegas H. B. type" (MNHN) (studied).

Paralectotypes ( Lampetia micromegas ). CHINA • 1 ♂; Chemo; 33°44'32"N, 103°23'45"E; 25 Apr. 1918; MNHN 02520 • 1 ♂; Chemo; 33°44'32"N, 103°23'45"E; 26 Apr. 1918; MNHN 02521 • 1 ♀; Chemo; 33°44'32"N, 103°23'45"E; 23 Apr. 1918; MNHN 02522 • 1 ♀; Shia-Shu; 10 May 1918; MNHN 02525 • 1 ♀; Jiangsu, Nanking; 32°00'27"N, 118°57'22"E; 6 May 1918; MNHN 02524.

Other material.

CHINA • 1 ♀; Ningpo; 29°44'29"N, 121°06'02"E; 29 Apr. 1925; J. T. Chu leg.; NMNH 05118 • 1 ♂; Jiangsu, Nanking; 32°00'27"N, 118°57'22"E; 1981; H. Jettmar leg.; NHMW 02516 • 1 ♀; Jiangsu, Nanking; 32°00'27"N, 118°57'22"E; 15 Apr. 1918; NBCN 02518 • 1 ♀; same data as for preceding; 16 Apr. 1918; MNHN • 16 ♂♂; Chenkiang; 32°08'24"N, 119°23'25"E; 1-13 Apr. 1918; MNHN • 12 ♀♀; same data as for preceding; MNHN • 6 ♂♂; Chemo; 33°44'32"N, 103°23'45"E; 23 Apr. 1918; MNHN • 4 ♀♀; same data as for preceding; MNHN • 1 ♀; Chemo; 33°44'32"N, 103°23'45"E; 23 Apr. 1918; NBCN • 1 ♀; same data as for preceding; 26 Apr. 1918; NBCN • 1 ♂; Hoachan; 16 May 1918; MNHN • 2 ♀♀; same data as for preceding; MNHN • 3 ♂♂; Shia-Shu; 22 Apr. 1918; MNHN.

Figures

Figure 7. Distribution map of Merodon serrulatus species group.

Figure 18. Male genitalia. A Merodon disjunctus sp. nov., epandrium, lateral view B Merodon disjunctus sp. nov., epandrium, ventral view C Merodon disjunctus sp. nov., hypandrium, lateral view D Merodon kawamurae, epandrium, lateral view E Merodon kawamurae, epandrium, ventral view F Merodon kawamurae, hypandrium, lateral view. Abbreviations: al-anterior surstyle lobe, bp-basolateral protrusion, l-lingula, pl-posterior surstyle lobe, s-lateral sclerite of aedeagus. Scale bar: 0.2 mm.

Figure 19. Antenna. A Merodon hirsutus, outer side, lateral view, male B Merodon hirsutus, inner side, lateral view, male C Merodon hirsutus, dorsal view, male D Merodon hirsutus, outer side, lateral view, female E Merodon kawamurae, outer side, lateral view, male F Merodon kawamurae, inner side, lateral view, male G Merodon kawamurae, dorsal view, male H Merodon kawamurae, outer side, lateral view, female I Merodon medium sp. nov., outer side, lateral view, male J Merodon medium sp. nov., outer side, lateral view, female. Scale bar: 1 mm.

Figure 22. A, B metaleg, C, D metatrochanter, metafemur and metatibia, lateral view. A Merodon kawamurae, male B Merodon kawamurae, female C Merodon medium sp. nov., male D Merodon medium sp. nov., female. Scale bar: 2 mm.

Figure 23. Body parts, dorsal view. A Merodon trianguloculus sp. nov., thorax, male B Merodon trianguloculus sp. nov., thorax, female C Merodon trianguloculus sp. nov., abdomen, male D Merodon trianguloculus sp. nov., abdomen, female E Merodon kawamurae, abdomen, male F Merodon kawamurae, abdomen, female. Scale bar: 2 mm.