Trimorus coriaceus, Komeda & Mita & Yamagishi, 2018

Komeda, Yoto, Mita, Toshiharu & Yamagishi, Kenzo, 2018, Three new brachypterous species of Trimorus Foerster (Hymenoptera, Scelionidae) from Japan, Journal of Hymenoptera Research 63, pp. 15-32 : 15

Trimorus coriaceus sp. n.

Figs 1 ; 4

Diagnosis.

Female. Frons coriaceous. A2-4 same length. Mandible tridentate; teeth almost same length. Mesoscutum flat, densely punctate-imbricate. Mesoscutellum flat, imbricate. Postacetabulum imbricate-smooth. Fore and hind wings reaching posterior edge of T1. T1 with slightly developed horn; T3 coriaceous with dense setae.

Description.

Female (n = 3): Length = 0.88-0.90 mm (m = 0.89).

Color (Fig. 1A, B ). Body light brown; head and A3-12 dark brown.

Head. FCI = 1.18-1.21 (m = 1.19); LCI = 1.50-1.62 (m = 1.55); DCI = 1.81-1.90 (m = 1.84) HW/IOS = 1.60-1.65 (m = 1.62); head about 1.3 times as wide as mesosoma (HW/TSL = 1.27-1.33, m = 1.31). Frons (Fig. 4A ) coriaceous with dense setae; frontal patch absent; central keel incomplete; antennal scrobe small, smooth, without setae; interantennal process (Fig. 1B ) rounded without setae. Vertex coriaceous with dense setae; POL as long as OOL (POL/OOL = 1.00-1.14, m = 1.05); OOL 1.5 times as long as LOL (OOL/LOL = 1.40-1.60, m = 1.53); hyperoccipital carina absent; vertex patch absent. Eyes with dense setae. Malar region costate; facial striae expanding to bottom of eye; orbital carina extending to top of eye. Gena coriaceous with dense setae; genal patch absent. A1 (Fig. 4B ) about 5.7 times as long as radicle (A1/r = 5.50-5.75, m = 5.67), about 11.3 times as long as A6 (A1/A6 = 11.00-11.50, m = 11.33), as long as clava (A1/cl = 1.00-1.05, m = 1.03); A2-4 same length, about 2 times as long as A6 (A2/A6 = 2.00; A3/A6 = 2.00; A4/A6 = 1.50-2.00, m = 1.83); A5 as long as A6 (A5/A6 = 1.00). Mandible tridentate; all teeth of mandible almost same length.

Mesosoma. Pronotal suprahumeral sulcus foveolate; epomial carina incompletely present; cervical pronotal area imbricate with dense setae; lateral pronotal area rugulose-smooth. Mesoscutum (Fig. 4C ) about 1.8 times as wide as long (TSL/ML = 1.67-1.76, m = 1.73), flat, densely punctate-imbricate, with dense setae; mesoscutal suprahumeral sulcus present; mesoscutal humeral sulcus present; antero-admedian line absent; notauli absent. Mesoscutellum about 2.6 times as wide as long (SW/SL = 2.50-2.63, m = 2.58), flat, imbricate, with dense setae; scutoscutellar sulcus foveolate; axillular carina present; mesoscutellum without median spine; posterior scutellar sulcus foveolate. Femoral depression (Fig. 4D ) smooth; mesopleural carina present; anterior rows of foveae of mesopleural carina present; posterior rows of foveae of mesopleural carina present dorsally; postacetabular sulcus foveolate; postacetabulum imbricate-smooth with dense setae; postacetabular patch absent; sternaulus foveolate; mesepimeral sulcus foveolate; speculum relatively wide, transversely sulcate; prespecular sulcus foveolate; transpleural sulcus foveolate. Metanotal trough foveolate; metascutellum smooth; metascutellar carina unclear; metanotal spine present, short, blunt. Metapleural sulcus foveolate; dorsal metapleural areas smooth; ventral metapleural areas smooth; paracoxal sulcus present; metapleural epicoxal sulcus present; metapleural epicoxal carina completely present; metapleural triangle smooth; prespiracular propodeal area narrow, modified to small teeth; lateral propodeal carina present; lateral propodeal area sulcate; metasomal depression sulcate; plica present posteriorly; posterior propodeal projection modified to shortly curved spine; plical area with dense setae. Legs (Fig. 1A, B ) elongate. Fore wing (Fig. 1A, B ) short, narrow, reaching posterior edge of T1. Hind wing short, narrow, reaching posterior edge of T1.

Metasoma. T1 about 0.7 times as long as T1+T2 length (T1W/T1+T2L = 0.59-0.87, m = 0.70), longitudinally costate; T1 horn slightly producing. T2 longitudinally costate anteriorly, coriaceous with dense setae posteriorly; basal depressions on T2 present; lateral patch of T2 absent; T3 (Fig. 4E ) about 1.2 times as wide as long (T3W/T3L = 1.16-1.26, m = 1.22), about 1.3 times as wide as mesoscutum (T3W/TSL = 1.23-1.43, m = 1.34), coriaceous with dense setae; basal depressions on T3 absent; lateral patch of T3 absent; posterodorsal patch of T3 absent; apical setae on T3 absent. S3 (Fig. 4F ) coriaceous with dense setae; basal depressions of S3 absent. T4 coriaceous with dense setae; median patch on T4 absent; lateral patch of T4 absent. T5 coriaceous with dense setae; lateral patch of T5 absent; T6 coriaceous with dense setae; lateral patch of T6 absent.

Male. Unknown.

Material examined. Holotype: Aichi pref.: Kita-Shitara dist., Shitara town, Uradani (Beech forest), alt. 900m, 18-24. VII. 1994, K. Yamagishi leg., 1♀ (EmT) [ELMU]. Paratypes: Same locality as the holotype, 9-17. IV. 1994, K. Yamagishi leg., 1♀ (YPT) [ELMU]; 25. IV-1. V. 1994, 1♀ (EmT) [ELMU]; 2-8. V. 1994, 3♀ (YPT) [ELMU]; 9-15. V. 1994, 1♀ (EmT) [ELMU]; 9-15. V. 1994, 1♀ (YPT) [ELMU]; 16-22. V. 1994, 1♀ (EmT) [ELMU]; 23-29. V. 1994, 9♀ (EmT) [ELMU]; 6-12. VI. 1994, 4♀ (YPT) [ELMU]; 13-19. VI. 1994, 23♀ (EmT) [ELMU]; 13-19. VI. 1994, 9♀ (YPT) [ELMU]; 20-26. VI. 1994, 8♀ (EmT) [ELKU]; 20-26. VI. 1994, 1♀ (MT) [ELMU]; 27. VI-3. VII. 1994, 7♀ (EmT) [ELKU]; 27. VI-3. VII. 1994, 2♀ (YPT) [ELMU]; 4-10. VII. 1994, 4♀ (EmT) [ELMU]; 11-17. VII. 1994, 2♀ (EmT) [ELMU]; 15-21. VIII. 1994, T. Kanbe leg., 1♀ (EmT) [ELMU]; 22-28. VIII. 1994, 2♀ (EmT) [ELMU]; 29. VIII-4. XI. 1994, K. Yamagishi leg., 3♀ (EmT) [ELKU]; 5-11. XI. 1994, 2♀ (EmT) [ELMU].

Distribution.

Japan (Honshu: Aichi).

Etymology.

The species name refers to the sculpture of frons and metasoma.

Remarks.

Among eastern Palearctic Trimorus species, this species is similar to T. amesis Kozlov & Kononova, 2001 and T. mirandus Kozlov & Kononova, 2001 in having shortened wings that at most reach posterior margin of mesosoma. However, it differs from T. amesis in small body size ( T. coriaceus about 0.9 mm, whereas T. amesis is about 1.4 mm), antenomere length ratio (A2, A3, A4 are same length, A4 is about 2 times longer than A5, A5 and A6 are same length in T. coriaceus ; A2 and A3 are same length, A4 is about 0.8 times shorter than A3 and 3.4 times longer than A5, A5 and A6 are same length in T. amesis ) and central keel (not reaching anterior ocellus in T. coriaseus ; complete in T. amesis ), and from T. mirandus in sculpture of frons, mesoscutellum, and T3 (frons is coriaceous (Fig. 4A ), mesoscutellum is imbricate (Fig. 4C ), and T3 is densely punctate-imbricate (Fig. 4E ) in T. coriaceus ; all of them are smooth in T. mirandus ). In addition, this species differs from T. granulatus sp. n. in the shape of head (flat in T. coriaceus (Fig. 1A, B ); globular in T. granulatus (Fig. 2A, B )) and sculpture of frons (coriaceous in T. coriaceus (Fig. 4A ); granulate in T. granulatus (Fig. 5A )) and T3 (densely punctate-imbricate in T. coriaceus (Fig. 4E ); shallowly punctate in T. granulatus (Fig. 5E )).

Figures

Figure 1. Trimorus coriaceus sp. n. A female, dorsal view B female, lateral view. Scale bars: 1 mm.

Figure 2. Trimorus granulatus sp. n. A female, dorsal view B female lateral view C male, dorsal view D male lateral view. Scale bars: 1 mm.

Figure 4. Trimorus coriaceus sp. n., female. A head, frontal view B Antennae C mesosoma, dorsal view D mesosoma, lateral view E metasoma, dorsal view F metasoma, ventral view.

Figure 5. Trimorus granulatus sp. n., female. A head, frontal view B Antennae C mesosoma, dorsal view D mesosoma, lateral view E metasoma, dorsal view F metasoma, ventral view.