The genus Surimyia superficially resembles Paragodon Thompson, 1969. Differs from all other known Syrphidae by the absence of microtrichia on the katatergum (= ventral part of lateral postnotal sclerite, also known as pleurotergite). It differs from all other known Microdontinae by the absence of pilosity on the postpronotum and otherwise by the presence of strong black setae on thorax, tergites and sternites (Reemer 2008).
The bare postpronotum is unique among Microdontinae (Cheng & Thompson 2008, Thompson 1999), and the lack of microtrichia on the katatergum is apparently unique among all Syrphidae (see Hippa & Ståhls 2005). Another striking character of the Surimyia-species is the presence of bristly pile on the thorax (anepisternum, anepimeron, mesonotum, postalar callus, scutellum) and abdomen (sternites and tergites). Thoracic bristly pilosity is uncommon among Syrphidae and known to occur only in a small number of genera (like Brachyopa, Cheilosia, Copestylum and Volucella). Bristly pilosity on the abdomen, especially on the sternites, is very rare among Syrphidae. Only Tachinosyrphus Hull has abdominal bristles on the fourth tergite (Thompson 1972) (from Reemer 2008).
Surimyia rolanderi Reemer, 2008.
Reemer, M. (2008) Surimyia, a new genus of Microdontinae, with notes on Paragodon Thompson, 1969 (Diptera, Syrphidae). Zoologische Mededelingen 82, 177-188.
From original description (Reemer 2008).
MALE.
Head. Eyes bare, in dorsal view separated over a distance of about 1/3 of width of head. Face in frontal view narrowing from width of an eye at level of ocellar triangle to about half this width at level of oral margin, slightly wider at level of antennal fossa. Antennal fossa about as wide as high. Face in profile convex, without frontal prominence and facial tubercle, oral margin not produced. Face, oral margin and genae yellow, shining, sparsely covered with short yellow pile. Frons, vertex and occiput shining blackish, except for yellow lateral parts of anterior half of frons. Frons only anterolaterally with some short yellow pile, otherwise bare. Vertex posteriorly with short reddish pile. Occiput mainly with bristly yellow pile, except for some black ones at level of antennae. Ocellar triangle clearly elevated relative to vertex, with frontal angle of approximately 80º. Antenna: black, or scape and pedicel paler ventrally. Total length of antenna more than the distance of frontal ocellus to lunula. Scape as long as pedicel and basofl agellomere together or slightly longer; four times the length of pedicel. Arista somewhat paler, about as long as 2/3 of basofl agellomere.
Thorax: Mesoscutum with three broad, connected, shining black vittae, leaving only some yellow along the margins; posteriorly two narrow, unclear yellowish lines in between the black vittae are visible; sparsely covered with semi-erect, reddish pile; with long, appressed black setae along lateral margins. Postpronotum shining yellow, bare. Postalar callus shining yellow, with a variable number of long and short black setae, predominantly anteriorly. Scutellum shining black, sparsely covered with semi-erect, reddish pile and with long, black, irregularly arranged setae along margins. Postnotum shining black, with obvious ‘arciform crest’ (see Hippa & Ståhls 2005). Pleura shining yellow, except for dark anterior part of anepisternum, ventral half of katepisternum, meron (meropleuron) and katatergum. Long black setae on dorsal parts of anepisternum (7-11) and anepimeron (8-10) (these setae break off easily, but the sockets should always be visible under suffi cient magnifi cation). Katatergum bare, without microtrichia. Metasternum narrow and bare. Metapleura hardly sclerotized and barely connected, touching in one point. Legs: Coxae black or blackish, sparsely with reddish pile. Coxae 2 and 3 posteriorly with microtrichia. Trochanters yellowish to brown with some short reddish and black pile. Legs without noticeable cicatrices, except vaguely expressed in some specimens at the base of the posterior femora. Legs 1 and 2 yellow, tarsae a little reddish. Femora 1 and 2 sparsely with short black pile, especially dorsally and posteriorly, other parts predominantly with short yellow pile. Tibiae and tarsae of legs 1 and 2 with short yellow pile. Femur 3 dark brown, except for yellow basal 1/3 and narrowly some yellow at the top. Tibia 3 yellow on basal 2/3, dark on distal 1/3. Tarsus 3 reddish brown, first tarsomere a little darker. Leg 3 entirely with short yellow pile, except for some black ones dorsally on femur. All tarsal claws dark, paler on basal half. Wing hyaline, covered with microtrichiae except on first costal cell, anterior and posterior parts of basal half of cell R (with a strip of microtrichia inbetween), on 3/4 of posterior half of cell BM, and on basal 1/3 of cell CuP. Calypter pale with dark margins. Halter yellow.
Abdomen. Four unmodified pregenital segments. Tergite 1 yellow, dark along posterior margin, laterally with short black setae. Tergite 2, 3 and 4 yellow with large lateral black marks, not reaching posterior margin, and with median black vittae over entire length of tergite, converging towards anterior margin. Tergites entirely covered with short, appressed black (sometimes yellow on yellow parts of tergite) setae. Tergite 2 laterally with long black setae. Tergites 2 and 3 with 8 to 10 long black setae along posterior margin, sometimes with some long setae on the middle of the tergite. Tergite 4 posteriorly with some long setae. Sternite 1 pale coloured and weakly sclerotized, except for stronger sclerotized blackish triangular portion basomedially; with appressed black setae along posterior margin. Other sternites yellow and occupied with randomly arranged short and long black setae.
FEMALE.
Except for genitalia and number of unmodifi ed pregenital segments (five), there is no sexual dimorphism. Even the eyes do not seem to be separated wider than in the male.
unless otherwise stated