Hadronotus omnistriatus Debnath, Rajmohana and Thirupam Reddy, 2025

Hadronotus omnistriatus Debnath, Rajmohana and Thirupam Reddy sp. nov.

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( Figure 2 View FIGURE 2 )

Female. Body length = 1.86–1.88 mm (n = 5).

Colour ( Figure 2A View FIGURE 2 ): Head black, mesosoma and metasoma brown to brownish black; legs pale yellow except honey brown coxae; antennae pale yellow except A8–A12 brownish black; wings hyaline; setae on body white.

Head ( Figure 2B–E View FIGURE 2 ): 1.2× as wide as high; 1.0× as high as long; 1.3× as wide as long; HW/TSL= 1.1; IOS 0.5× of HW; head including frons, vertex areolate rugose with dense setae except transversely carinate frontal depression; gena finely granulose with sparse setae; base of mandible smooth; margin of frontal depression not delimited by carina; central keel incomplete, extending 0.3× length of frontal depression; facial striae absent; orbital furrow with setations along dorsal half of compound eye; eyes large, height (in frontal view) 1.1× of IOS, densely pubescent; epiclypeal carina weakly ‘V’ shaped; anterior margin of clypeus straight, anterolateral corners rounded, with six setae; mandible subtridentate; malar sulcus prominent with uniform width; malar striae absent; genal carina absent; lateral ocelli not contiguous with orbital margin; POL> LOL> OOL in ratio of 22:13:5; POL 4.4× of OD; hyperoccipital carina absent; occipital carina incomplete, terminating near dorsal margin of compound eye, anterior margin on gena crenulate; A1 5.1× longer than thick; A2 1.8× A 3 in length; A3 1.5× as long as wide; proportions of length to width of A1 to A7 (31:6), (11:5), (6:4), (4:4), (4:5), (4:5), (4:7); clava 5-merous, claval formula 1-2-2- 2-2.

Mesosoma ( Figure 2F–G View FIGURE 2 ): Mesoscutum and mesoscutellum 0.6× and 0.4× as long as wide respectively, finely granulose and densely setose; mesoscutum raised medially, depressed at laterally in dorsal view; notauli absent; mesoscutal suprahumeral sulcus foveolate; mesoscutal humeral sulcus present as smooth furrow; mesoscutal humeral pit much smaller than foveae of mesoscutal suprahumeral sulcus; scutoscutellar sulcus foveolate laterally in axillar area and smooth medially; posterior margin of mesoscutellum not extending over metanotum; posterior mesoscutellar sulcus, metanotal trough foveolate; metascutellum dorsally foveolate and ventrally rugose; propodeum longitudinally striated; pronotal suprahumeral sulcus foveolate; epomial carina present; cervical pronotal area with same sculpture as on mesoscutum; lateral pronotal area with irregular transverse rugulae; pronotal cervical sulcus with three irregular fovea ventrally; netrion sulcus absent; mesopleural pit present; subacropleural sulcus foveolate; speculum transversely rugose; mesepimeral sulcus complete, foveolate; postacetabular sulcus crenulate; mesopleural carina present, anterior margin with fine, small irregular cells extending up to postacetabular sulcus; femoral depression transversely rugose; episternal foveae present, one in number; postacetabular patch present, setose; dorsal metapleural area setigerous punctate and ventral metapleural area rugose with scattered setae; metapleural sulcus foveolate; paracoxal and metapleural epicoxal sulcus foveolate.

Wings: Macropterous; forewing (L:W = 19:7), m: st: pm = 3:4:8; hindwing (L:W = 52:11).

Metasoma ( Figure 2H View FIGURE 2 ): 1.3× longer than wide; T1 without any lateral carina or pit; T1 2.6× wider than long, 0.5× of T 2 in length, foveolate basally followed by longitudinal parallel striae throughout, finely granulose laterally, smooth apically, densely setose laterally; T2 1.5× of T 3 in length, foveolate basally followed by longitudinal irregular parallel striae throughout, interstices and lateral area finely granulose, smooth apically, densely setose laterally and sparsely setose sublaterally; T3 with irregular longitudinal striae, interstices granulose, smooth apically, moderately setose; T4–T6 coriaceous, densely setose; proportions of width to length of T1–T6 (39:15), (62:28), (60:18), (50:10), (39:5), (24:7); S1 basally foveolate followed by longitudinal parallel costae throughout; S2 basally foveolate, rest finely granulose.

Male: Unknown.

Variation: Differences in body length are noted (see description above).

Etymology: The specific epithet is derived from the Latin words ‘omni’ (= entire) and ‘striatus’ (= striated), referring to the entirely longitudinally striated T2 and T3.

Biology: Emerged from unidentified reduviid eggs collected from the bark of an Arjun tree in the tasar ecosystem.

Species group placement: muscaeformis species group, based on the diagnostic characters as in Masner (1983).

Material examined: Holotype: Female ( ZSI/35601 /H3): INDIA: Chhattisgarh, Bastar , ~ 593 m a.s.l, 19.232351°N, 81.915197°E, 11 October 2024, ex. eggs of unidentified Reduviidae, Coll : B. Thirupam Reddy GoogleMaps . Paratypes: 4 Females ( ZSI/35602–35605 /H3): with the same data as holotype. Voucher specimens GoogleMaps : 2 females, with the same data as holotype, preserved in absolute alcohol GoogleMaps .

Diagnosis: Hadronotus omnistriatus Debnath, Rajmohana and Thirupam Reddy sp. nov. can be distinguished from other species of Hadronotus from Oriental region by the following combination of characters: eyes large, densely setose; epiclypeal carina weakly ‘V’ shaped; hyperoccipital carina absent; occipital carina incomplete; mesoscutum raised medially and depressed laterally in dorsal view; mesoscutal humeral pit present; mesopleural carina prominent; episternal fovea present, one in number; T2 foveolate basally followed by longitudinal irregular parallel striae throughout, interstices and lateral area finely granulose; T3 with irregular longitudinal striae, interstices granulose; forewing with marginal vein smaller than stigmal vein.

In the key to the species of muscaeformis species group by Mineo (1981), the proposed new species comes close to H. japonicus Ashmead, 1904 . However, H. omnistriatus can be distinguished from H. japonicus by larger eyes (eye height 1.1× IOS in H. omnistriatus vs eye height 0.6× IOS in H. japonicus ), pilosity of eyes (densely setose in H. omnistriatus vs bare in H. japonicus ), sculpture of T2 (longitudinal irregular parallel striae throughout in H. omnistriatus vs longitudinal irregular parallel striae limited basally in H. japonicus ), and absence of hyperoccipital carina (in H. japonicus , present).

The muscaeformis species group is represented in India only by two species, H. clavigrallae ( Mineo, 1994) and H. flavipes Ashmead, 1905 . Hadronotus omnistriatus resembles H. flavipes Ashmead, 1905 , but can be separated from the latter at once by the sculpture of T2 (foveolate basally followed by longitudinal irregular parallel striae throughout in H. omnistriatus vs foveolate basally followed by longitudinal irregular parallel striae up to half of T 2 in length), sculpture of T3 (longitudinally striate throughout in H. omnistriatus vs longitudinal striae absent in H. flavipes ), pilosity of eyes (densely setose in H. omnistriatus vs bare in H. flavipes ), and larger eyes (eye height 1.1× IOS in H. omnistriatus vs eye height 0.6× IOS in H. flavipes ). Due to the compound eye being longer than the IOS, H. omnistriatus also resembles H. amerares ( Kozlov & Lê 1992) of the muscaeformis species group from Vietnam. However, both can be distinguished mainly by the sculpture of T2, T3 and the absence of hyperoccipital carina (in H. amerares , present).