Megacoxa Brazidec 2024
Creators: name: Vilhelmsen, Lars
name: Wu, Qiong
name: Wang, Zhen
name: Gao, Tai-Ping
name: Ren, Dong
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Australomicroprotopidae
Megacoxa

description: Genus † Megacoxa Brazidec et al., 2024
Type species
† Megacoxa janzeni Brazidec et al., 2024.
Emended diagnosis
Compound eye oval; scape wider than long; low occipital carina slightly crenulate. Mesoscutoscutellar sulcus crenulate. Fore wing venation with veins R1, M+Cu, Sc+R, A and Cu fully pigmented; vein A connected to medial cell with vein cu-a; vein Rs closing marginal cell without bend. 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. Metatibia and metabasitarsus sometimes with ventral row of comb-like setae; two mesotibial and two metatibial spurs. Metasomal length variable.
Key to species of † Megacoxa spp.
1. Metasoma at most as long as mesosoma (Fig. 3A–B; Brazidec et al. 2024: fig. 6b, e) ................... 2
– Metasoma clearly longer than mesosoma (Figs 2A, 4A) ................................................................. 3
2. Hind coxal posterior margin strongly carinate and with row of foveae (Brazidec et al. 2024: fig. 6c); hind tibial apical spurs longer than max. width of hind tibia (Brazidec et al. 2024: fig. 6b, g); hind basitarsus approx. 1.5 × as long as remaining tarsomeres combined (Brazidec et al. 2024: fig. 6b, g); ovipositor shorter than body (Brazidec et al. 2024: fig. 6b, e) ................................................................................. † Megacoxa chandrahrasa Brazidec et al., 2024
– Hind coxal posterior margin without carina or row of foveae (Fig. 3B); hind tibial apical spurs much shorter than max. width of hind tibia (Fig. 3B); hind basitarsus slightly shorter than combined length of remaining tarsomeres (Fig. 3A); ovipositor longer than body (Fig. 3A) ............................................................................................... † Megacoxa gungner sp. nov.
3. Hind coxal posterior margin with row of large foveae (Brazidec et al. 2024: figs 7b, 8c, g); median mesoscutal sulcus smooth or crenulate ............................................................................................. 4
– Hind coxal posterior margin without foveae (Figs 2D, 4C); median mesoscutal sulcus smooth (Fig. 4B) ............................................................................................................................................ 5
4. Median mesosocutal sulcus smooth (e.g., Fig. 4B); axillae not abutting medially (e.g., Fig. 4B); hind tibia triangular, broadest close to apex (Brazidec et al. 2024: fig. 7d) ............................................... ............................................................................................ † Megacoxa janzeni Brazidec et al., 2024
– Median mesoscutal sulcus crenulate (Fig. 5A; Brazidec et al. 2024: fig. 8f); axillae abutting medially (Brazidec et al. 2024: fig. 8f); hind tibia spindle-shaped, broadest at two-thirds from base (Fig. 5C; Brazidec et al. 2024: fig. 8a) .......................................† Megacoxa synchrotron Brazidec et al., 2024
5. Head with transverse striae on frons (Fig. 2B); antennae longer than head + mesosoma combined (Fig. 2A); axillae abutting medially .....................................................† Megacoxa brazideci sp. nov.
– Frons smooth; antennae shorter than head + mesosoma combined (Fig. 4A); axillae not abutting medially (Fig. 4B) ................................................................................ † Megacoxa mjoelner sp. nov.
description: Published as part of Vilhelmsen, Lars, Wu, Qiong, Wang, Zhen, Gao, Tai-Ping & Ren, Dong, 2025, Three new species of the long-tailed wasp genus † Megacoxa Brazidec et al., 2024 (Hymenoptera: Megalyridae) from Kachin amber, pp. 238-254 in European Journal of Taxonomy 976 (1) on pages 240-251, DOI: 10.5852/ejt.2025.976.2793, http://zenodo.org/record/14981651