Merodon lotus Vujić & Radenković, 2021
Vujić, Ante, Radenković, Snežana, Zorić, Ljiljana Šašić, Likov, Laura, Tot, Tamara, Veselić, Sanja & Djan, Mihajla, 2021, Revision of the Merodon bombiformis group (Diptera: Syrphidae) - rare and endemic African hoverflies, European Journal of Taxonomy 755 (1), pp. 88-135 : 99-103
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|Merodon lotus Vujić & Radenković|
Merodon lotus Vujić & Radenković sp. nov.
Figs 1 View Fig , 4E View Fig , 5E View Fig , 6E View Fig , 9E View Fig , 10E View Fig , 11E View Fig , 12E View Fig , 14D View Fig , 15D View Fig , 16D View Fig , 17 View Fig , 18A View Fig , 22A–C View Fig , 26 View Fig
Black, medium sized species (8–9 mm), with shiny face, posterior half of scutum and terga without pollinosity (except a pair of indistinct pollinose fasciae on tergum 4 in female) ( Fig. 14D View Fig ); male genitalia with S-forming posterior lobe of surstyle, gradually narrowing toward tip ( Fig. 17A, D View Fig : pl), anterior margin of surstyle rounded in lateral view ( Fig. 17A, D View Fig : ams). Similar to Merodon nasicus from which differs in less prominent oral margin ( Fig. 11E View Fig ), and terga without clear pollinosity ( Figs 5E View Fig , 14D View Fig ), while in M. nasicus oral margin distinctly protruded ( Fig. 11F View Fig ) and terga 2–4 with distinct pollinose fasciae ( Figs 5F View Fig , 14E View Fig , 20D View Fig ).
The specific epithet ‘ lotus ’ is a Latin adjective meaning ‘elegant, fine’, also ‘washed/clean’, implying clean, non pollinose terga, as the main diagnostic character of this species.
Paratypes REPUBLIC OF SOUTH AFRICA • 1 ♂; Ceres, Ceres 2 ; 33.365° S, 19.289° E; 547 m a.s.l.; 9 Nov. 2018; A. Vujić and S. Radenković Sanja leg.; FSUNS ZA6_021 ; FSUNS GoogleMaps • 4 ♂♂, 1 ♀; same collection data as for holotype; FSUNS ZA6_048 , ZA6_049 , ZA6_052 , ZA6_060 , ZA6_066 ; FSUNS GoogleMaps • 1 ♀; same collection data as for holotype; FSUNS ID ZA6_067 ; NMSA GoogleMaps .
REPUBLIC OF SOUTH AFRICA • 1 ♂; Cape Province, Ceres ; 1500 ft; Dec. 1920; R.E. Turner leg.; Merodon appendiculatus Hull unpublished name; BMNH .
Length: medium sized species, body 8–9 mm, wing 5–6 mm (n = 8).
HAD ( Figs 4E View Fig , 9E View Fig , 11E View Fig , 12E View Fig ). Antenna ( Fig. 4E View Fig ) brown; pedicel slightly shorter than basoflagellomere (relation scape:pedicel: basoflagellomere =1.0: 2.1: 2.5); basoflagellomere concave dorsally, with acute apex; arista thickened basally, yellowish at basal third, the rest blackish, 2.2 times as long as basoflagellomere. Face shiny black, covered with whitish or yellowish pile, except on bare medial vitta that occupies half width of face. Oral margin slightly protruded ( Fig. 9E View Fig ). Frons shiny black, inflated, covered with whitish-gray pile and gray pollinosity along eye margins. Vertical triangle isosceles ( Fig. 12E View Fig ), dark, predominantly covered with long, yellowish pile, except some black ones on ocellar triangle in some specimens. Ocellar triangle usually equilateral. Eye pile gray, except upper fourth with black pile, slightly longer than scape. Eye contiguity about 14–16 ommatidia long. Occiput blackish, mostly pollinose, except behind vertical triangle, covered with yellow pile.
THORAX ( Figs 6E View Fig , 10E View Fig ). Mesonotum black, covered with reddish-yellow pile; scutum without pollinose longitudinal vittae, but postpronotum and anterior part of scutum pollinose ( Fig. 10E View Fig ). Pleuron black, covered with sparse gray pollinosity and the following parts with whitish to yellow pile: anterior part of proepimeron, posterior part of anterior anepisternum, most of the posterior anepisternum except anterior end, antero-ventral and postero-dorsal part of katepisternum, anepimeron, metasternum. Wing brownish, hyaline, with dense microtrichia and dark brown veins. Calypter yellowish. Halter with yellowish pedicel and capitulum. All three femora dark brown to black; tibiae mostly reddish, medially black to dark brown; tarsi reddish, except blackish apical segment ( Fig. 6E View Fig ). Metatrochanter without calcar. Metafemur moderately thickened, with less developed apicoventral triangular lamina, more or less denatate, the apical dens more or less distinct ( Fig. 6E View Fig ). Pile on legs predominantly yellowish.
ABDOMEN ( Fig. 5E View Fig ). Black, covered with yellow to whitish pile on lateral sides. Tergum 1 covered with short whitish to yellow pile; terga 2 and 3 medially with shorter black pile, except two medial fasciae with whitish pile and some whitish pile at posterior margin; anterior half of tergum 4 covered with short black pile, posterior half with longer yellowish pilosity, medially with two oblique fasciae covered with whitish pile. Sterna dark brown, covered with yellowish pile.
GENITALIA ( Figs 17 View Fig , 18A View Fig ). Posterior lobe of surstyle broad, bent, S-shaped, gradually narrowing toward tip ( Fig. 17A, D View Fig : pl); anterior lobe of surstyle undeveloped ( Fig. 17A, D View Fig ); anterior margin of surstyle rounded in lateral view ( Fig. 17A, D View Fig : ams); cercus square like ( Fig. 17A, D View Fig : c). Hypandrium with theca medially distinctly narrowed ( Fig. 17C, F View Fig ). Lateral sclerite of aedeagus small ( Fig. 18A View Fig : s).
Similar to the male except for normal sexual dimorphism: Frons shiny, non pollinose, except along eye margins ( Fig. 15D View Fig ); tergum 4 with a pair of indistinct narrow oblique pollinose fasciae.
Period of flight and distribution ( Fig. 1 View Fig )
Merodon lotus sp. nov. occurs in RSA in the Ceres Mountain Fynbos Nature Reserve; the flight period is in November and December. This species appears in Mediterranean evergreen forest-hard-leaf scrub in the south of the African continent ( Sayre et al. 2013).
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