Mermerizon inbio Reemer

Reemer, Menno & Stahls, Gunilla, 2013, Generic revision and species classification of the Microdontinae (Diptera, Syrphidae), ZooKeys 288, pp. 1-213 : 103-104

Mermerizon inbio Reemer sp. n. Figs 157-162

Type specimen.

HOLOTYPE. COSTA RICA. Male. Label 1: "COSTA RICA. Prov. Guanacaste, P.N. / Rincón de la Vieja, Send. a las aguas / termales, 900-1000 m, 6-7 OCT / 2001. D. Briceño, Red con Aguamiel. / L_N_305843_392970 #64950"; label 2: "INB0003380896 / INBIOCRI COSTA RICA"; label 3 (red): "Ultimo especimen en / BD A. Lépiz / 2-7-2002" / other side: “?MCR-25”. Coll. INBIO.

Diagnosis.

Distinguished from the other two known (yet undescribed) species of Mermerizon by the black pilose mesoscutum.

Description (based on holotype).

Adult female. Body size: 7,5 mm.

Head. Face occupying about 1/4 of head width in frontal view; yellow; yellow pilose, with narrow bare median line on dorsal half. Gena yellow. Frons black; yellow pilose laterally, black pilose posteriorly. Vertex dark yellow, except black at and around ocellar triangle; black pilose. Occiput black, except yellow posteriad of vertex; black pilose on dorsal half, yellow pilose on ventral half. Eye bare. Antennal fossa about as high as wide. Antenna with scape dark brown, pedicel and basoflagellomere yellowish brown; antennal ratio approximately as 4:1:4.

Thorax. Scutum blackish brown, except yellow on notopleuron and around postpronotum and postalar callus; black pilose. Postpronotum, postalar callus and scutellum yellow; black pilose. Scutellum semicircular, without calcars, Anepisternum blackish brown; convex, without sulcus; black pilose on anterior part and along posterior margin, widely bare in between. Anepimeron brown; black pilose on dorsal 1/4. Katepisternum yellow dorsally, brown ventrally; bare. Katepimeron yellow. Katatergum long microtrichose. Anatergum short pale microtrichose. Calypter blackish. Halter yellowish brown.

Wing: hyaline; microtrichose, except bare on cell bc, basal 1/4 of cell br, basal 1/3 of cell bm, anterobasal 1/4 of cell cup.

Legs: Front and mid legs yellowish brown; black pilose. Hind leg blackish brown, except basal 1/2 of tibia and apical four tarsomeres yellowish brown. Front and mid coxae and trochanters yellowish brown; yellow pilose apically. Hind coxa and trochanter dark brown; black pilose.

Abdomen. Tergites and sternites yellowish; yellow pilose, except sternite 1 bare. Genitalia as in Fig. 162.

Female. Unknown.

Etymology.

The specific epithet (noun in apposition) is based on InBio, an acronym of Instituto Nacional de Biodiversidad, the Costa Rican institute which holds the holotype of this species.