3.1.1.3. Genus † Megacoxa gen. nov.

Type species.

† Megacoxa janzeni sp. nov.

Etymology.

The genus name refers to the size of the metacoxa, which is the key diagnostic feature of the genus; besides, the prefix Mega - alludes to the family name Megalyridae . Gender feminine.

Diagnosis.

Compound eye oval; scape wider than long; thin occipital carina slightly crenulate. Parapsidal line present and located on posterolateral part of mesoscutum (Figs 6C, 7B and E); inner axillar groove crenulate (Fig. 8F). Fore wing venation with R1, M+Cu, Sc+R, A and Cu fully pigmented; A connected to medial cell with cu-a; Rs closing marginal cell without bend (Figs 2D-F). Metacoxa much enlarged, with dorsal surface rounded to angular, outer metacoxal surface posteriorly foveate, inner metacoxal surface almost entirely accommodated in anterolateral, shallow concavity of metasoma (Figs 6C, 7B, 8C and G). Metatibia and metabasitarsus with ventral row of comb-like setae; two mesotibial and two metatibial spurs (Figs 6A and 7A). Metasoma slightly shorter than mesosoma, tergites and sternites beveled (Figs 6B and 7A).

Comments.

The enlarged metacoxa accommodated in the anterior metasomal concavity is the key diagnostic feature for † Megacoxa gen. nov. This condition is present in all five specimens assigned to this genus and the metacoxae are clearly symmetrical in the synchrotron-scanned specimen, thus ruling out a preservational artefact.