Megaprosternum kayin, Colombo & Azevedo, 2024

Colombo, Wesley D. & Azevedo, Celso O., 2024, Revision of the strongly flattened Megaprosternum Azevedo (Hymenoptera, Bethylidae), European Journal of Taxonomy 958 (1), pp. 1-47 : 19-22

Megaprosternum kayin sp. nov.

urn:lsid:zoobank.org:act:9D4AB98D-E77D-4334-AF74-8DFFAA7BDA9F

Fig. 7

Differential diagnosis

The females of this species are morphologically similar to those of M. hmong sp. nov., as aforementioned in its section of the differential diagnosis.

Etymology

The epithet kayin is derived from the Kayin, an ethnolinguistic group of Sino-Tibetan language-speaking peoples who live in western Thailand.

Material examined

Holotype

THAILAND – Prachuap Khiri Khan • ♀; “ Prachua[p] Khiri Khan Khao Sam Roi Yot N[ational] P[ark] , Nature education center , 12°14.48’N 99°56.023’E, Malaise trap, 10–17.viii.2008, Yai & Sorat leg. T3024”; QSBG.

Paratype

THAILAND – Phetchaburi • 1 ♀; “ P[h]etchaburi, Kaeng Krachan N[ational] P[ark] , Panernthung/ km27, 12°49.302’N 99°22.263’E, Malaise trap, 11–18.xii.2008, Sirichai leg. T4398”; QSBG.

Description

Female

MEASUREMENTS (mm). Body length 2.2–2.4; LH 0.53; WH 0.40; WF 0.24; WOT 0.05; surface of median clypeal lobe 0.06; HE 0.20; OOL 0.26; LFW 1.40.

COLOR ( Fig. 7A–B ). Head, mesosoma and metasoma light castaneous.

HEAD ( Fig. 7C ). Oval, in lateral view; sides almost parallel, in dorsal view; malar space absent; median clypeal lobe incurved, as long as lateral ones, with pair of lateral carinae, parallel posteriorly, lobe delimitation indistinct; mandible with three apical teeth; hypostoma rounded medially; antenna with 11 flagellomeres, pedicel longer than flagellomere I; eye glabrous, contour not protruding; frons coriaceous; ocellar triangle with anterior angle acute, postocellar line almost as long as DAO.

MESOSOMA ( Fig. 7D–E ). Pronotal flange polished and coriaceous, with posterior margin at least 1.6× as wide as anterior one; dorsal pronotal area coriaceous, posterior margin outcurved medially, overlapping anterior area of mesoscutum; probasisternum with anterior margin strongly angulated, posterior margin curved; epicnemium with anterior margin almost straight; mesoscutum longer than mesoscutellum medially; parapsidal signum absent; transscutal fissure conspicuous; mesoscuto-scutellar suture absent; mesopleuron with mesepimeral lobe not evident, anterior mesopleural fovea absent, mesopleural epicoxal lobe not evident, mesopleural pit absent, upper mesopleural fovea absent; metapectal-propodeal disc almost as long as wide medially, without evident constriction at propodeal spiracle; transverse anterior carina present; lateral marginal carina absent; paraspiracular sulcus absent; paraspiracular carina absent; metapostnotal median carina absent; propodeal spiracle circular, on dorsal surface of the metapectal-propodeal complex; metadiscrimen present; metafurcal pit circular; forewing with prestigmal abscissa of radial 1 subrectangular, as wide as Sc+R vein; prestigmal flexion line absent, pterostigma small and circular; hind wing slender with three non-equidistant distal hamuli.

METASOMA. S2aa with anterior margin straight; S2pa as long as wide medially, evenly wide; second abdominal spiracle circular; third abdominal sternum with anterior margin incurved; abdominal tergum narrowing apicad.

Male

Unknown.

Variations

There are no morphological variations worthy of mention.

Host

Unknown.

Distribution

Thailand (Prachua Khiri Khan).

Figures

Fig. 7. Megaprosternum kayin sp. nov., paratype, ♀ (T4398, QSBG). A–B. Habitus. A. Lateral view. B. Dorsal view. C. Head, dorsal view. D–E. Mesosoma. D. Dorsal view. E. Ventral view. Scale bars: A–B = 250 μm; C–E = 125 μm.