Serichlamys trigonoides Reemer, 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

publication ID	https://doi.org/10.3897/zookeys.1243.132809
publication LSID	lsid:zoobank.org:pub:494DA692-E7B5-455B-82B0-390DE5924743
DOI	https://doi.org/10.5281/zenodo.15732580
persistent identifier	https://treatment.plazi.org/id/8FD053E0-7DCD-5B8F-8213-7F7A6D69496E
treatment provided by	ZooKeys by Pensoft
scientific name	Serichlamys trigonoides Reemer
status	sp. nov.

Treatment

Serichlamys trigonoides Reemer sp. nov.

Figs 36 View Figures 36–43 , 113–117 View Figures 113–117 , 145 View Figures 142–145

Type material.

Holotype. Brazil • 1 ♂, holotype of Serichlamys trigonoides sp. nov.; São Paulo, Praia Grande, Faz. Rondonea ; Feb. 1945; M. Carrera leg; MZUSP. Label 1: “ São Paulo // Praia Grande // Faz. Rondonea // Fev. – 1945 // M. Carrera coll. ”; label 2: “ Serichlamys sp. // Det. M. Reemer 2024 // Specimen code MR 1590 ”.

Description

(based on holotype). Adult male Body size: 6 mm.

Head. Face occupying ~ 1 / 3 of head width in frontal view; shiny yellowish brown; white setulose. Gena yellow; white setulose. Oral margin laterally hardly produced. Frons yellowish brown; medially bare, laterally golden yellow setulose. Vertex yellowish brown; golden yellow setulose. Occiput pale brown, white setulose. Eye bare. Antenna yellowish brown; antennal ratio ~ 2.5: 1: 4.5.

Thorax. Scutum shiny yellowish brown; golden yellow setulose. Postpronotum and postalar callus yellowish brown; golden yellow setulose. Scutellum trapezoid, yellowish brown; black setulose medially, golden yellow setulose laterally and posteriorly; with two acute calcars as long as ~ 1 / 3 of scutellar length. Pleura yellowish brown. Anepisternum with shallow sulcus; golden yellow setulose anterodorsally and posterodorsally, widely bare medially and ventrally. Anepimeron golden yellow setulose. Katepisternum with patch of white setulae dorsally and a few white setulae ventrally. Katatergite long microtrichose, anatergite short microtrichose. Calypter and halter pale yellow.

Wing: hyaline; microtrichose, except bare on narrow strip in cell r 1 along vein RS, most of cell br (only microtrichose along vena spuria), posterobasal 1 / 4 of cell bm, and basomedian 1 / 4 of alula.

Legs: pale brown, with femora and hind metatarsus somewhat darker; yellow to white setulose. Coxae and trochanters brown; yellow to white setulose.

Abdomen. Tergites dark brown, except tergite 2 medially pale brown and tergite 3 with pair of wide pale brown maculae along posterior margin. Tergites 1 and 2 white setulose. Tergite 3 black setulose anteromedially, white setulose laterally and posteriorly. Tergite 4 yellowish setulose laterally and posteriorly, black setulose anteriorly and medially. Sternites yellowish; white setulose. Genitalia as in Fig. 145 View Figures 142–145 .

Female. Unknown.

Diagnosis.

Body length: male 6 mm (n = 1). This is the only known species of Serichlamys with a pale face in which the abdomen is at its widest around halfway tergite 2 (Figs 36 View Figures 36–43 , 113 View Figures 113–117 ) (this is also the case in S. melamitis Reemer , sp. nov., S. mellimitis Reemer , sp. nov. and S. mitis , but in these species the face is dark). Its colouration is also characteristic, with a yellowish brown scutum and pattern of dark and pale maculae on the tergites (Fig. 36 View Figures 36–43 ). Because of these characters, this species reminds of certain Neotropical species of stingless bees. Male genitalia as in Fig. 145 View Figures 142–145 .

Etymology.

The name trigonoides is an adjective derived from the name Trigona Jurine, 1807 , a commonly occurring genus of stingless bees ( Apidae : Meliponini ) in South America. The habitus of S. trigonoides reminds of those bees.

Distribution.

This species is only known from the Brazilian State of São Paulo.