Trimorus granulatus, 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 : 15-17

Trimorus granulatus sp. n.

Figs 2 ; 5 ; 6

Diagnosis.

Head globular. Frons granulate. Eyes small. Mandible subtridentate, with anterior and posterior large teeth and median small tooth. Mesoscutum and mesoscutellum flat, granulate. Postacetabulum granulate-smooth. In female, A2 and A3 longest among A2-6; fore and hind wings short, narrow, beyond anterior edge of metasoma; T1 without horn; T3 shallowly punctate with dense setae. In male, A5 about 2.3 times as long as wide, about 1.5 times as long as tyloid; fore and hind wings long, narrow, exceeding to apical metasoma; T3 weakly punctate-smooth.

Description.

Female (n = 3): Length = 0.90-0.95 mm (m = 0.93).

Color (Fig. 2A, B ). Body dark brown; A1-2, legs, T1 light brown.

Head globular. FCI = 1.13-1.16 (m = 1.14); LCI = 1.28-1.35 (m = 1.32); DCI = 1.48-1.52 (m = 1.50); HW/IOS = 1.33-1.40 (m = 1.37); head about 1.3 times as wide as mesosoma (HW/TSL = 1.24-1.32, m = 1.29). Frons (Fig. 5A ) granulate with dense setae; frontal patch absent; central keel present ventrally; antennal scrobe small, smooth, without setae; interantennal process (Fig. 2B ) rounded without setae. Vertex granulate with dense setae; POL as long as OOL (POL/OOL = 0.90-1.11, m = 1.00); OOL about 1.9 times as long as LOL (OOL/LOL = 1.80-2.00, m = 1.87); hyperoccipital carina absent; vertex patch absent. Eyes small with dense setae. Malar region costate; facial striae expanding to bottom level of eye; orbital carina extending to top level of eye. Gena granulate with dense setae; genal patch absent. A1 (Fig. 5B ) about 5.6 times as long as radicle (A1/r = 5.50-5.75, m = 5.58), about 22.3 times as long as A6 (A1/A6 = 22.00-23.00, m = 22.33), about as long as clava (A1/cl = 1.05-1.10, m = 1.00); A2-3 same length, 5 times as long as A6 (A2/A6 = 5.00; A3/A6 = 5.00); A4 about 3.3 times as long as A6 (A4/A6 = 3.00-4.00, m = 3.33); A5 as long as A6 (A5/A6 = 1.00). Mandible tridentate; anterior and posterior tooth same length, median tooth shorter.

Mesosoma. Pronotal suprahumeral sulcus sulcate-foveolate; epomial carina weakly present; cervical pronotal area granulate with dense setae; lateral pronotal area smooth. Mesoscutum (Fig. 5C ) about 1.6 times as wide as long (TSL/ML = 1.50-1.61, m = 1.56), flat, granulate, with dense setae; mesoscutal suprahumeral sulcus weakly present; mesoscutal humeral sulcus weakly present; antero-admedian line absent; notauli weakly present, expanding to half level of mesoscutum; inter notaular area granulate with dense setae; lateral notaular area granulate with dense setae. Mesoscutellum about 2.4 times as wide as long (SW/SL = 2.25-2.50, m = 2.36), flat, granulate, with dense setae; scutoscutellar sulcus foveolate; axillular carina present; mesoscutellum without median spine; posterior scutellar sulcus foveolate. Femoral depression (Fig. 5D ) smooth; mesopleural carina present; anterior rows of foveae of mesopleural carina present; posterior rows of foveae of mesopleural carina foveolate dorsally; postacetabular sulcus foveolate; postacetabulum granulate-smooth with dense setae; postacetabular patch absent; sternaulus absent; mesepimeral sulcus foveolate; speculum wide, transversely sulcate; prespecular sulcus foveolate; transpleural sulcus absent. Metanotal trough foveolate; metascutellum rugulose-foveolate; metascutellar carina unclear; metanotal spine weakly present, short, blunt. Metapleural sulcus present; dorsal metapleural areas smooth; ventral metapleural areas smooth; paracoxal sulcus foveolate; metapleural epicoxal sulcus present; metapleural epicoxal carina completely present; metapleural triangle smooth; prespiracular propodeal area narrow; lateral propodeal carina present; lateral propodeal area sulcate; metasomal depression sulcate; plica absent; posterior propodeal projection weakly present; plical area narrow, with dense setae. Legs (Fig. 2A, B ) elongate. Fore wing (Fig. 2A, B ) short, narrow, beyond anterior edge of metasoma. Hind wing short, narrow, beyond anterior edge of metasoma.

Metasoma. T1 about 0.6 times as long as T1+T2 length (T1W/T1+T2L = 0.50-0.59, m = 0.55), longitudinally costate. T2 longitudinally costate in anterior, shallowly punctate with dense setae in posterior; basal depressions on T2 present; lateral patch of T2 absent. T3 (Fig. 5E ) about 1.2 times as wide as long (T3W/T3L = 1.10-1.22, m = 1.16), about 1.2 times as wide as mesoscutum (T3W/TSL = 1.18-1.22, m = 1.20), shallowly punctate 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. 5F ) shallowly punctate with dense setae. T4 shallowly punctate with dense setae; median patch on T4 absent; lateral patch of T4 absent. T5 shallowly punctate with dense setae; lateral patch of T5 absent. T6 shallowly punctate with dense setae; lateral patch of T6 absent.

Male (n = 3): Length = 0.93-1.00 mm (m = 0.95). FCI = 1.17-1.27 (m = 1.22); LCI = 1.32-1.36 (m = 1.34); DCI = 1.55-1.73 (m = 1.64); HW/IOS = 1.42-1.46 (m = 1.45); HW/TSL = 1.17-1.27 (m = 1.24). Central keel (Fig. 6A ) present, incom plete dorsally; antennal scrobe larger than female, smooth, without setae. POL/OOL = 0.89-1.00 (m =0.96); OOL/LOL = 1.80-2.25 (m = 2.10). Eyes larger than female. Orbital carina extending to bottom level of eye. A1/r = 4.00-4.40 (m = 4.20); A5 (Fig. 6B ) 2.3 times as long as wide (A5L/A5W = 2.25), about 1.5 times as long as tyloid (A5L/ty = 1.50). TSL/ML = 1.36-1.50 (m = 1.44). SW/SL = 2.00-2.20 (m = 2.13); notauli (Fig. 6C ) present, expanding to 3/4 levels of mesoscutum. Mesoscutellum shallowly punctate-smooth with dense setae. Anterior rows of foveae of mesopleural carina (Fig. 6D ) foveolate dorsally, smooth ventrally; postacetabulum granulate-smooth with sparse setae; speculum wide, smooth. Metapleural sulcus absent; paracoxal sulcus foveolate dorsally, absent ventrally; metapleural epicoxal sulcus absent; lateral propodeal area foveolate; metasomal depression foveolate; plica present in posterior; plical area with dense setae. Legs (Fig. 2C, D ) elongate. Fore wing (Fig. 2C, D ) long, narrow, exceeding to apical metasoma, as wide as mesoscutum (TSL/WW = 0.94-1.04, m = 1.00); marginal vain about 3.5 times as long as stigmal vein (m/st = 3.33-3.67, m = 3.53). Hind wing long, narrow, exceeding to apical metasoma, 1.5 times as wide as length of marginal cilia at widest point (HWW/HWS = 1.40-1.50, m = 1.47). T1W/T1+T2L = 0.60-0.63 (m = 0.61). T3W/T3L = 1.11-1.23 (m = 1.18); T3 (Fig. 6E ) narrower (T3W/TSL = 1.03-1.07, m = 1.04), weakly punctate-smooth with sparse setae; posterodorsal patch of T3 present, rugulose. S3 (Fig. 6F ) smooth with dense setae; S3 setae sparser than female. T4 smooth with dense setae; T4 setae sparser than female.

Material examined.

Holotype: Fukuoka pref.: Fukuoka city, Mt. Tachibana, 2. X. 1993, H. Honda leg., 1♀ (YPT) [ELKU] . Paratypes: Same locality as the holotype , 2. X. 1993, H. Honda leg., 5♂ (YPT) [ELKU]; 16. X. 1993, 7♂ 2♀ (YPT) [ELKU]; 23. X. 1993, 5♂ 5♀ (YPT) [ELKU]; 30. X. 1993, 6♂ 1♀ (YPT) [ELKU]; 6. XI. 1993, 7♂ 2♀ (YPT) [ELKU]; 14. XI. 1993, 8♂ 6♀ (YPT) [ELKU]; 20. XI. 1993, 6♂ 6♀ (YPT) [ELKU]; 27. XI. 1993, 3♂ 2♀ (YPT) [ELKU].

Distribution.

Japan (Kyushu: Fukuoka).

Etymology.

The species name refers to the sculpture on frons and mesoscutum.

Remarks.

Among eastern Palearctic Trimorus species, the female of this species is similar to T. amesis Kozlov & Kononova, 2001 and T. mirandus Kozlov & Kononova, 2001 in shortened wings at most reaching posterior margin of mesosoma. But it differs from T. amesis in small body size ( T. granulatus about 0.9 mm; T. amesis about 1.4 mm) and sculpture of T3 (shallowly punctate in T. granulatus , Trimorus coriaceus in T. amesis ), and from T. mirandus in sculpture of frons, mesoscutellum and T3 (frons and mesoscutellum are granulate (Fig. 5A, C ) and T3 is shallowly punctate (Fig. 5E ) in T. granulatus ; all of them are smooth in T. mirandus ). In addition, this species differs from T. coriaceus sp. n. in the shape of head (globular in T. granulatus (Fig. 2A, B ), flat in T. coriaceus (Fig. 1A, B )) and sculpture of frons (granulate in T. granulatus (Fig. 5A ); coriaceous in T. coriaceus (Fig. 4A )) and T3 (shallowly punctate in T. granulatus (Fig. 5E ); densely punctate-imbricate in T. coriaceus (Fig. 4E )). Male of T. granulatus is similar to T. bisulcatus Kieffer, 1908 in ratio of length and width of antenomeres. The new species differs from T. bisulcatus in body size ( T. granulatus is about 1 mm; T. bisulcatus is about 1.7-2 mm) and body sculpture.

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.

Figure 6. Trimorus granulatus sp. n., male. A head, frontal view B A 5, lateral view C mesosoma, dorsal view D mesosoma, lateral view E metasoma, dorsal view F metasoma, ventral view.