Serichlamys pallitarsis Reemer & Mengual, 2025

Reemer, Menno & Mengual, Ximo, 2025, Revision of the Neotropical species of the hoverfly genus Serichlamys Curran, 1925 (Diptera, Syrphidae, Microdontinae), ZooKeys 1243, pp. 51-106 : 51-106

Serichlamys pallitarsis Reemer & Mengual sp. nov.

Figs 9 , 28 , 32 , 34 , 93–97 , 140

Type material.

Holotype. Colombia • 1 ♂, holotype of Serichlamys pallitarsis sp. nov.; Valle de Cauca, San Antonio ; 3°29.14'N, 76°37.60'W; 24 Feb. 2006; B. J. & F. C. Thompson leg; USNM. Label 1: “ Colombia. Valle de Cauca // San Antonio // 76 37.60W 3 29.14N // 24 Feb 2006 // BL & FC Thompson ”; USNM barcode label: USNMENT 00035809 . Paratypes. Colombia • 2 ♂ 1 ♀ with same data as holotype; USNM • 1 ♂; Caldas Manizales, Corregimiento, La Palmas, Parque Rio Blanco ; 5°4.98'N, 75°25.07'W; 18 Feb. 2006; B. J. & F. C. Thompson leg.; USNM • 1 ♂; Dept. Valle del Cauca, Cali, Cerro San Antonio ; 15 Feb. 2006; 2200 m asl; X. Mengual leg.; ZFMK; DNA voucher code MZH: Y 370 ; GenBank accession no. PQ 629012 • 1 ♂; Dept. Valle del Cauca, Cali, Cerro San Antonio ; 24 Feb. 2006; 2200 m asl; X. Mengual leg.; ZFMK; DNA voucher code MZH: Y 369 ; GenBank accession no. HF 569344 • 1 ♂; Saladito, Vallé ; 2000 m asl; 17 Feb. 1970; D. M. Wood leg.; CNC .

Additional specimens.

Colombia • 1 ♂; Pichindé , Vallé; 1800 m asl; 24 Feb. 1970; D. M. Wood leg.; CNC • 1 ♀; W. Colombia, Villa Karolina ; 1600 m asl; 10 Jul. 1908; NHMUK [C. T. Trechmann Bequest, B. M. 1964-549] .

Description

(based on holotype). Adult male Body size: 9 mm.

Head. Face occupying ~ 2 / 5 of head width in frontal view; shiny black; yellowish white setulose, except black setulose on dorsal 1 / 4. Gena very narrow; black; white setulose. Oral margin laterally not produced. Frons black; medially bare, laterally black setulose except yellowish white setulose along eye margin. Vertex black; golden yellow setulose. Occiput black; dorsal 1 / 2 golden yellow setulose, ventral 1 / 2 white setulose. Eye bare. Antenna: scape black, pedicel and postpedicel dark brown; antennal ratio as ~ 7: 1: 7.

Thorax. Scutum shiny black with faint greenish metallic sheen, margins shiny dark brown; golden yellow setulose. Postpronotum and postalar callus shiny dark brown; golden yellow setulose. Scutellum trapezoid, shiny dark brown, with two apical calcars as long as ~ 1 / 3 of scutellar length. Pleura shiny brown, except meron and ventral parts of katepisternum blackish. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of yellowish setulae dorsally and a few yellowish setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow.

Wing: hyaline; microtrichose, except bare on basal 2 / 5 of cell r 1, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 2 of cell bm, anterobasal 1 / 2 of cell cup, and basomedian 4 / 5 of alula.

Legs (Figs 9 , 28 ): femora blackish brown, with apices narrowly yellowish; black setulose anteriorly, yellow setulose posteriorly. Tibiae dark brown with vaguely demarcated blackish rings; yellow and white setulose. Tarsi yellowish brown; black setulose dorsally, yellow setulose ventrally. Coxae and trochanters blackish; yellow and white setulose.

Abdomen. Tergites blackish, with lateral and posterior margins brown. Tergite 1 yellowish setulose. Tergite 2 shiny (subshiny on lateral 1 / 4 due to microsculpture) with three dull maculae: a small oval median one and a pair of small oblique lateral ones; yellowish setulose laterally, white setulose medially. Tergite 3 dull on most of surface, with lateral and posterior margins shiny; yellow setulose on shiny parts, black setulose on dull parts. Tergite 4 semi-shiny; golden yellow setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites brown; yellow setulose. Genitalia as in Fig. 140 .

Female. As male, except for following differences. Face, frons, vertex, and occiput entirely black setulose. Postpedicel orange. Scutum, scutellum, and pleura black setulose. Wings infuscate, especially around veins. Tergite 5 yellowish brown.

Diagnosis.

Body length: male 8.5–10 mm (n = 4), female 11 mm (n = 1). Superficially, this species looks most similar to S. boti Reemer , sp. nov., S. chloraspis Reemer , sp. nov., and S. varicaudata Reemer & Mengual , sp. nov., which are of similar size and colouration. These species also share the following combination of characters: face black, tibiae entirely brown, tergite 3 broadly dull with narrow shiny margins. From S. chloraspis Reemer , sp. nov. and S. varicaudata Reemer & Mengual , sp. nov. this species differs by the entirely orange tarsi (dark in S. chloraspis Reemer , sp. nov. and S. varicaudata Reemer & Mengual , sp. nov.). From S. boti Reemer , sp. nov. it differs by the entirely microtrichose wing cell dm (partly bare in S. boti Reemer , sp. nov.), as well as by the presence of 4 or 5 basoventral setae on the surstylus (2 in S. boti Reemer , sp. nov.). Male genitalia as in Fig. 140 .

Etymology.

The specific epithet is a noun referring to the pale (pallidus, L. = pale) tarsi of this species.

Molecular data.

The two paratype males from Cerro San Antonio were successfully sequenced and cluster together in our NJ tree (BS = 100). The obtained DNA barcodes are short (396 bp and 431 bp in length) and have a 99.468 % similarity. The DNA barcodes of this species show affinity to those of S. varicaudata Reemer & Mengual , sp. nov. (similarity = 92.235–94.382 %).

Distribution.

This species is only known from the Valle del Cauca area on the western slopes of the Andes in Colombia.

Figures

Figures 5–12. 5, 6 colour of face of Serichlamys species 5 black (S. chloraspis Reemer, sp. nov. male, holotype) 6 yellowish brown (S. serpentiphallus Reemer, sp. nov. male, holotype) 7–9 hind tibiae of Serichlamys species 7 with contrasting colour pattern (S. vexilliphallus Reemer & Mengual, sp. nov. male, holotype) 8 uniformly yellowish brown (S. mitis (Curran, 1940) male, specimen MR 1576) 9 dark (S. pallitarsis Reemer & Mengual, sp. nov. male, holotype) 10–12 antenna of Serichlamys species 10 postpedicel pale brown with apical 1 / 3 dark (S. mitis (Curran, 1940) male, specimen MR 1576) 11 postpedicel entirely dark brown (S. varicaudata Reemer & Mengual, sp. nov. male, holotype) 12 postpedicel entirely orange (S. pallitarsis Reemer & Mengual, sp. nov. female, paratype).

Figures 24–29. 24, 25. Microtrichiae on wing cell dm in Serichlamys species 24 S. boti Reemer, sp. nov. male, holotype 25 S. varicaudata Reemer & Mengual, sp. nov. male, holotype 26, 27 scutum and scutellum of Serichlamys males 26 S. chloraspis Reemer, sp. nov. holotype 27 S. varicaudata Reemer & Mengual, sp. nov. holotype 28, 29 hind tarsus of Serichlamys males 28 S. pallitarsis Reemer & Mengual, sp. nov. holotype 29 S. varicaudata Reemer & Mengual, sp. nov. holotype.

Figures 30–35. 30–33 tergite 2 of Serichlamys males. White lines in lower half of figures indicate position of dull maculae 30 S. boti Reemer, sp. nov. holotype 31 S. chloraspis Reemer, sp. nov. holotype 32 S. pallitarsis Reemer & Mengual, sp. nov. holotype 33 S. varicaudata Reemer & Mengual, sp. nov. holotype 34, 35 antenna of Serichlamys females 34 S. pallitarsis Reemer & Mengual, sp. nov. paratype 35 S. varicaudata Reemer & Mengual, sp. nov. paratype.

Figures 93–97. Serichlamys pallitarsis Reemer & Mengual, sp. nov. male, holotype (except S 34: female, paratype) 93 habitus, dorsal 94 habitus, dorsal (female) 95 head, frontal 96 head, lateral 97 head, dorsal.

Figures 138–141. Serichlamys male genitalia 138 S. boti Reemer, sp. nov. holotype 139 S. chloraspis Reemer, sp. nov. paratype 140 S. pallitarsis Reemer & Mengual, sp. nov. paratype, coll. USNM, specimen code MR 1595 141 S. varicaudata Reemer & Mengual, sp. nov., coll. ZFMK, specimen code MR 425.