Ramiplectrus catiensis, Yefremova & Feldstein-Farkash, 2025

Yefremova, Zoya A. & Feldstein-Farkash, Tamar, 2025, Ramiplectrus catiensis, a new genus and a new species with branched male antennae and long metatibial spurs from Vietnam (Hymenoptera: Eulophidae), Israel Journal of Entomology (Oxford, England) 54 (6), pp. 7-19 : 10-13

Ramiplectrus catiensis sp. n.

Figs 1–7

LSID: urn:lsid:zoobank.org:act:0A872377-1B4F-468E-BDF9-B9F5FF0FC24E .

Etymology: The species name refers to the type locality “Cát Tiên National Park”.

Diagnosis: Male. Antenna: branch on F1 1.2× as long as branch on F2 ( Fig. 3 ). Hind leg: TS1 2.2× as long as TS2 and 2.0× as long as T1. Clypeus delimited by complete suture anteriorly and incomplete laterally ( Fig. 4 ). Occiput with sharp occipital carina ( Fig. 1 ). Vertex with numerous scattered setae between lateral ocelli. Axillae almost connected by narrow anteromedial axillary angles. Forewing without speculum, SMV with 3 long setae. Petiole short and smooth. Digiti in male genitalia bearing one digital spine.

Description. Male. Body length 1.45 mm, forewing length 1.25 mm.

Color ( Figs 1, 2 ). Body mostly black. Head completely black, eyes grey, ocelli, mandibles, clypeus and antenna yellow. Mesosoma with brown tegulae. Gaster brown, with large yellow spot at base. Legs: fore and middle legs brownish, hind legs brown with yellow spurs.

Head. Eyes bare ( Fig. 3 ). Clypeus with several setae, delimited by strong anterior suture that fades out laterally ( Fig. 4 ). Mandibles small and without teeth ( Fig. 4 ). Scrobal grooves sutured and joining below at ⅓ of eyes height. Malar sulcus present. Occipital carina present ( Fig. 1 ). Antennae inserted at lower level of eyes. Vertex with numerous scattered setae between lateral ocelli. POL 1.7× as long as OOL. Antenna ( Figs 3, 4 ). Scape 3.6× as long as wide. Pedicel 1.4× as long as wide ( Fig. 4 ) and 1.3× shorter than F1. One anellus. Flagellomeres F1–F4: F1=F2=F3, F4 1.2× shorter than each of previous flagellomeres; F3 3.0× as long as wide, F4 2.0× as long as wide. F1 and F2 with branches, F3 and F4 unbranched. First branch ( Fig. 4 ) as long as scape, second branch 1.2× shorter than scape. First branch 1.2× as long as second branch. Clava 2.6× as long as wide and 2.0× as long as F4.

Mesosoma . Pronotum large, 2.5× as broad as long. Propleura meet medially so that prosternum visible ventrally only partly ( Fig. 4 ). Notauli complete. Mesoscutum covered by numerous setae, mid lobe of mesoscutum with one pair of long setae on posterior margin ( Figs 1, 2 ) and one pair of long setae on two lateral lobes (=scapulae). Scutellum areolate rugose ( Fig. 1 ), with two sublateral longitudinal grooves and two pairs of long setae. Axillae finely reticulate almost connected by narrow anteromedial axillary angles. Propodeum ( Figs 1 , 5 ) smooth and shiny, with median carina and narrow raised cup. Cup with acute sharp anterior projection. Callus of propodeum with 6 long setae in two rows: 2 in first and 4 in second. Forewing ( Fig. 2 ) 2.75× as long as broad, speculum absent. SMV with 3 long setae, MV as long as SMV, PMV 1.7× as long as STV. Costal cell with two rows of setae on ventral surface (7 setae in each row) and 2 setae near MV. Legs: hind legs with two tibial spurs: TS1 2.25× as long as TS2 ( Fig. 6 ), TS1 2.0× as long as T1 and reaching ⅔ of tarsus. TS2 equal to T1. T1 2.4 × as long as T2.

Metasoma. Petiole transverse and smooth. Gaster 1.9× as long as its wide. Digitus with one digital spine ( Fig. 7 ).

Holotype: ♂ Vietnam: Dong Nai Province: Cát Tiên National Park , 11°30′N 107°20′E, 12.xii.2011, Z. Yefremova, Malaise trap (SMNHTAU In.424207).

Paratype: 1♂, same data as holotype, GenBank OQ 629297 (SMNHTAU). The gaster of the paratype has been removed for molecular analysis .

Distribution: Vietnam.

Host: Unknown.

Figures

Figs 1, 2. Ramiplectrus catiensis sp. n., male holotype, habitus: (1) dorsal view; (2) lateral view.

Figs 3–7. Ramiplectrus catiensis sp. n., male holotype: (3) head and antenna, dorsolateral view; (4) head,frontal andpropleura + prepectus + fore coxae, ventral view; (5) scutellum + propodeum andhind coxae, dorsal view; (6) metatibia with 2 spurs, lateral view; (7) gaster + genitalia, ventral view.