Linnaeomyia Jaschhof & Jaschhof, 2015

The genus Linnaeomyia was recently introduced for L. hortensis, a species described from a single male found in a Malaise catch from Öland, southeast Sweden (Jaschhof & Jaschhof 2015). Further Malaise trapping in the same area, only 500 m away from the type locality, has now provided another male of L. hortensis, which is used here for updating the original description. Furthermore, a series of male Dicerurini from the Czech Republic, assumed to belong to a new genus and provided for our study by Tomáš Sikora (University of Ostrava), on closer examination turned out to be a new species of Linnaeomyia, which is described and named here L. pratensis . All this new information is used for revising the generic diagnosis, as follows.

Diagnosis. Male morphology leaves no doubt on the affinity of Linnaeomyia with the tribe Dicerurini, within which it bears a faint resemblance to Neurepidosis (Jaschhof & Jaschhof 2015) . There is no single unique structure or character that distinguishes Linnaeomyia, rather it is several characters in combination that are significant, as follows. (1) The ejaculatory apodeme is vestigial, i.e. short, thin, and poorly sclerotized (Jaschhof & Jaschhof 2015, figs 2, 4; this paper, Fig. 6), whereas it is a large, well sclerotized rod in most other Dicerurini . (2) The tegmen, which is basically an elongate tube, is slightly broadened towards the apex, before it suddenly narrows into a small, variously shaped appendix (Jaschhof & Jaschhof 2015: fig. 4; this paper, Fig. 8); its texture is rigid rather than flexible and, in one of the species ( L. pratensis), reinforced by sclerotization. (The tegmen, not the ejaculatory apodeme, seems to stabilize the aedeagus, a completely soft-membranous structure in Linnaeomyia .) (3) The medial bridges of the gonocoxae are modified to hold variously shaped processes or protuberances (Figs 5–6). Much less pronounced modifications are known from other Dicerurini, where the medial bridges are bulged or angled in various ways. (4) The gonostylus consists of two lobes: a bulbous main lobe with setae, and a much smaller side lobe, whose surface is either glabrous (Jaschhof & Jaschhof 2015: fig. 3) or microtrichose (Fig. 6). The gonostylar apex (or the apex of the main lobe) bears either a tooth or dense, large microtrichia.