Trogloembolemus okanoi Mita & Olmi, 2018

Mita, Toshiharu & Olmi, Massimo, 2018, Taxonomic additions of Embolemidae and Sclerogibbidae (Hymenoptera: Chrysidoidea) from Japan, with description of a new species of Trogloembolemus, Zootaxa 4497 (4), pp. 586-592 : 587-589

Trogloembolemus okanoi Mita & Olmi , new species

( Figs 5–9 )

Diagnosis. Female: micropterous. Head and mesosoma fusiform; head with dorsal surface weakly rounded; maxillary palpi with four palpomeres; labial palpi with two palpomeres; third palpomere of maxillary palpi broadened; ocelli absent; eye strongly reduced; scape geniculated; antenna slightly longer than body length; pronotum without track of median longitudinal furrow; mesoscutum transverse; mesoscutellum triangular; metanotum reduced to narrow longitudinal carina; metapectal-propodeal complex rugose. Male: unknown.

Description. Female. Micropterous. Length 3.8 mm. Head and mesosoma brown; antenna testaceous, brown scape; legs testaceous, coxae brown; metasoma testaceous, brown petiole. Antenna geniculated, filiform, without ADO’s, slightly longer than body length (14:13); antennomeres in following proportions: 1.05:0.15:0.38:0.40:0.40:0.38:0.35:0.35:0.33:0.38. Head ( Figs 5–7 ) fusiform, slightly alutaceous, covered with short setae, dorsal surface weakly rounded; temple ( Figs 7 , 9 ) moderately tapered; occipital carina complete; ocelli absent; eye ( Fig. 6 ) very small, reduced to small dark spot, approximately 0.06 × as long as head; ventral region of face from clypeus to antennal toruli without two longitudinal sutures. Maxillary palpi with four palpomeres; labial palpi with two palpomeres. Third palpomere of maxillary palpi broadened. Pronotum ( Figs 7 , 9 ) dull, granulate, covered with short setae, with two lateral incomplete carinae from posterior border to approximately half length of pronotum; anterior collar short; disc long, without median longitudinal groove, indistinct median carina present on posterior 0.3; pronotal tubercle reaching tegula. Mesoscutum ( Figs 7 , 9 ) very short, transverse, alutaceous, with track of median furrow. Mesoscutellum narrow, triangular. Metanotum ( Figs 8 , 9 ) very narrow, forming bridge on anterior part of metapectal-propodeal complex. Meso-metapleural suture complete. Mesopleuron and metapleuron dull, striate. Metapectal-propodeal complex ( Figs 8 , 9 ) dull, granulated and weakly rugose, spiracle prominent ( Fig. 8 ); two lateral apophyses ( Fig. 8 ) between metapostnotum and first abdominal tergum; metapostnotal lateral carinae connecting spiracles to pronotal tubercles, running laterally to metanotum, mesoscutellum and mesoscutum; posterior surface inclined, granulated and transversely rugose. Forewing strongly reduced, 2.0 × as long as tegula. Hind wing absent. Tibial spurs 1/2/2. Tarsi slender. Petiole short.

Male. Unknown.

Material examined. Holotype, ♀, Japan, Ehime Pref., Matsuyama-shi, Sugitate-machi , 33°51'43.38''N, 132°50'40.59''E, 26.VII.2015, R. Okano leg. ( ELKU).

Distribution. Japan (Shikoku).

Remarks. Trogloembolemus okanoi sp. nov. is distinguished from T. fujiei Olmi, Mita & Guglielmino, 2014 by having the stout body, the large, transverse mesoscutum, the rugose metapostnotum, whereas T. fujiei has the slender body, the ovoidal mesoscutum, and the granulated metapostnotum. The holotype ♀ was found from rocky soil approximately 1 m deep.

Etymology. Species epithet is named after R. Okano, the holotype collector.

Figures

FIGURES 5–8. Trogloembolemus okanoi, sp. nov., holotype ♀. 5, lateral habitus; 6, head, lateral view; 7, head and mesosoma, dorsal view; 8, metapectal-propodeal complex. Scale = 1 mm.

FIGURES 9–10. Head and mesosoma in dorsal view. 9, Trogloembolemus okanoi sp. nov., holotype ♀; 10, Embolemus walkeri, ♀ from Tochigi Prefecture, Japan.