Pseudodryinus shihoae Mita

Mita, Toshiharu, 2009, A taxonomic study of the Dryininae (Hymenoptera: Dryinidae) of Japan, with description of a new species of Pseudodryinus, Zootaxa 2168, pp. 45-56 : 52-53

Pseudodryinus shihoae Mita , New Species

( Figs. 9–14 )

Description of the holotype (female). Head ( Fig. 10 ) 0.61x as long as wide, flat, largely smooth, but anterior half of frons scattered with minute punctures and setae; frontal carina visible but anteriorly indistinct; shortest distance between eyes 0.41x as long as maximum head breadth in dorsal view; malar space and gena densely scattered with minute punctures and setae; ocellar region slightly swollen; posterior margin of vertex widely excavated; occipital carina incomplete, visible only behind ocellar region and eyes. Eye oval, 2.67x as long as wide in dorsal view. POL: 4; OL: 2; OOL: 7; OPL: 1; greatest breadth of anterior ocellus longer than OL (3:2). Mandible with four teeth of identical size. Clypeus ( Fig. 11 ) with apical margin rounded and bearing small process; surface largely smooth and scattered with several small punctures. Maxillary palpus with five segments; labial palpus with three segments. Antenna filiform; FI 1.18x as long as maximum head breadth in dorsal view; length of antennal segments = 7.5: 4.5: 40.0: 23.0: 18.5: 12.0: 7.5: 6.0: 5.5: 9.0; total length of antenna 3.93 times as long as maximum head breadth in dorsal view.

Pronotum ( Fig. 9 ) as long as wide, smooth, with two weak anterior and posterior impressions; disc widely excavated, smooth; anterior collar laterally expanded, laminated and smooth; posterior collar smooth; pronotal tubercle reaching tegula. Scutum 0.48x as long as broad; median area anteriorly rounded, smooth; lateral area rounded, smooth; notaulus distinct, converging at posterior margin of scutum. Scutellum smooth. Mesepisternum sparsely scattered with small punctures: surface among punctures smooth; precoxal suture well developed, converging with posterior oblique suture ( Fig. 9 ). Metanotum half as long as scutum, smooth. Metapleuron smooth excluding carinate area around propodeal spiracle; metapleural spiracle ( Fig. 9 ) small, rounded. Dorsal surface of propodeum 0.58x as long as wide, dorsally 1.11x, laterally 0.88x as long as posterior surface, with two median longitudinal keels, pair of lateral keels, and pair of postero-lateral areolae: surface among keels sculptured; transverse carina strong; posterior surface with two distinct longitudinal keels and transverse keels: surface between longitudinal keels transversely striate; surface among keels irregularly striate.

Forewing ( Fig. 13 ) hyaline, covered with testaceous setae: setae on median cell sparser; radial vein moderately curving and reaching apical margin. Foreleg slender; length of coxa: trochanter: femur: tibia = 32: 37: 37: 34; tarsal segments in ratio = 11.5: 3.0: 5.0: 23.5: 33.0; basal part of third segment producing a hook. Fifth segment of fore tarsus ( Fig. 12 ) with inner margin bearing two rows of 10 (3+7) lamellae; distal apex with group of ten lamellae; proximal projection: distal part = 10: 1. Rudimentary claw present. Enlarged claw ( Fig. 12 ) bearing large subapical tooth; inner margin with row of eight lamellae, and four lamellae between subapical tooth and distal apex. Metacoxa smooth.

Metasoma with hypopygium covered with sparsely located, long and erect setae; dorsal half without short setae; ventral half covered with densely located, short and decumbent setae.

Colour. Body testaceous; ocellar region dark brown; teeth of mandible reddish; antenna testaceous excluding whitish FIV–VIII; anterior margin of pronotum dark brown; dorsal surface of propodeum anteriorly with large dark brown spot; basal part of posterior surface with brown nuances; first tergum mostly dark brown excluding posterior margin; anterior margin of subsequent terga dark brown; hypopygium brown.

Measurements. Head 0.94 mm long excluding clypeus, 0.61 mm broad; eye 0.44 mm in maximum diameter; mesosoma 1.41 mm in full length; pronotum 0.51 long, 0.51 mm wide; scutum 0.30 mm long, 0.62 mm broad; scutellum 0.19 mm long; metanotum 0.14 mm long; propodeum 0.49 mm broad, dorsal surface 0.28 mm long; forewing 2.43 mm long; metasoma 2.11 mm long; total body length 4.1 mm.

Male. Unknown.

Type series. Holotype: F, (first label) “[ Japan] Miyama-no-Taki, Kure-Shi, Hiroshima Pref., 22–23. viii. 2002, Shiho Arai leg.”, (second red label) “ HOLOTYPE Pseudodryinus shihoae Mita, 2009 ” ( ELKU) (Type No. 3267). Paratype: 1F, “ Japan: Aichi, Toyota, Takiwaki, 19–25 VIII. 2002, MT (Y. Kurahashi)” ( ELMU).

Distribution. JAPAN: Western Honshu (Aichi; Hiroshima).

Host. Unknown.

Etymology. Dedicated to Ms. Shiho Arai who collected the holotype.

Remarks. The paratype differs from the holotype in the following two characters: wholly testaceous propodeum and smaller body length (3.8 mm). The holotype and paratype were collected by flight interception trap. This species is similar to P. sinensis Olmi collected in Taiwan considering the testaceous body colour and position of ocelli, but is easily distinguishable from the latter by the following three characters: incomplete occipital carina (complete in P. sinensis ); posteriorly converging notauli (faintly separated in P. s i n e n s i s); and the sculptured lateral region of the dorsal surface of the propodeum (smooth in P. sinensis ). A fossil species, P. parisiensis Peinado, Nel & Waller from the Paris basin (Early Eocene amber) was known only as Palaearctic Pseudodryinus ( Peinado et. al., 2006). This new species represents the second record and first extant species from the Palaearctic Region.

Figures

FIGURES 9 – 13. Pseudodryinus shihoae Mita, sp. n. (holotype). 9. Head in dorsal view. 10. Mesosoma in lateral view. 11. Clypeus. 12. Chela (right). 13. Forewing (right).

FIGURE 14. Pseudodryinus shihoae Mita, sp. n. (paratype), general habitus.