Idiotypa maritima ( Haliday, 1833 )

Chemyreva, Vasilisa G., Notton, David G. & Zaldívar-Riverón, Alejandro, 2021, Revision of Palaearctic Idiotypa (Hymenoptera, Diapriidae, Diapriinae, Spilomicrini), Zootaxa 4966 (2), pp. 127-144 : 133-135

Idiotypa maritima ( Haliday, 1833)

( Figs 1, 2 , 5, 7, 9 , 11–13 )

Psilus maritimus Haliday, 1833: 275 .

Diapria (Mionopria) maritima: Haliday, 1857: 172 .

Mionopria maritima: Marshall, 1874: 136 .

Idiotypa maritima: Ashmead, 1893: 403 ; Dalla Torre, 1898: 445; Kieffer, 1912: 20; Morley, 1929: 44; Notton & O’Connor, 2004: 217.

Idiotypa maritimus: Fergusson, 1978: 115 (incorrect termination).

Mionopria rufiventris Thomson, 1858: 373 .

Idiotypa rufiventris: Marshall, 1873: 11 ; Marshall, 1874: 136; Kieffer, 1909: 387, Kieffer, 1911: 15; Kieffer, 1912: 20; Kieffer, 1916: 49; Hellén, 1963: 7; Kozlov, 1978: 594; O’Connor & Ashe, 1992: 2, 11, syn. n.

Idiotypa nigriceps Kieffer, 1909: 386 ; Kieffer, 1912: 20; Nixon, 1980: 14; Notton, 2014: 52 , syn. n.

Idiotypa nigriceps Kieffer, 1911: 814 ; Kieffer, 1916: 49; Morley, 1929: 44; Notton, 2014: 57 , syn. n.

The lectotype of I. maritima is glued on a card and is hard to examine. There is no doubt about its identity, however the redescription below is based on other specimens.

Redescription. Female. Body length 1.0–2.1 mm; fore wing weakly to distinctly extending beyond the top of the metasoma; antenna 0.63–0.73 times as long as body.

Colour. Head black to dark brown; mesosoma and petiole black to brown; A8‒A12 black to brown; A7 pale brown to black; mandibles brown; metasoma brown to yellow; legs, tegulae and A1‒A7 yellow to pale brown; palps yellow. Head and mesosoma always distinctly darker than gaster.

Head in lateral view 1.07‒1.14 times as high as long, in dorsal view weakly transverse 1.07‒1.17 times as wide as long, as wide as to weakly narrower than mesosoma, with long scattered setae. Ocelli not large; distance between posterior ocelli 2.3 times longer than the smallest ocellar diameter. Occipital flange narrow, without sculpture. Face smooth, with scattered long setae. Tentorial pits tiny. Malar sulcus distinct and complete. Malar space 0.75‒0.98 times as high as height of eye. Clypeus semi-circular, bare and smooth, weakly convex, epistomal sulcus indistinct. Pleurostoma distance 0.51‒0.53 times as wide as width of head. Mandible with two subequal teeth. Eye oval, pubescent. Antennal shelf in frontal view sculptured, with depression between toruli on frontal surface, covered with short erect setae.

Antennae with abrupt 5-segmented clava. Scape cylindrical, slightly curved, with apical rim simple. A8‒A12 flattened on ventral side with well-defined MGS brush; in lateral view connection between A7‒A12 situated dorsally. Ratios of length to width of antennomeres in dorsal view: A1 15:4; A2 4.5:3; A3 3:2.5; A4 2:2.5; A5 2:2.5; A6 2:3; A7 2.5:4; A8 4:5.5; A9 4:6; A10 4:6; A11 4:6; A12 7:6. Some specimens with transverse А4‒А8, some with А7‒А8, or only А8; А2 equal to or longer than А3.

Mesosoma in lateral view 1.40‒1.61 times as long as high, in dorsal view 1.37‒1.49 times as long as wide. Pronotum smooth; pronotal cervical area and anterior margin of pronotum pubescent. Mesopleuron with deep sulcus under tegulae, mesepimeral sulcus deep and complete; sternaulus absent. Mesoscutum 1.38‒1.65 times as wide as long, covered with scattered erect setae. Notaulus complete, deep broadened at base and sculptured at bottom, rarely smooth. Humeral sulcus narrow, deep and complete. Scutellum with three pits anteriorly, median pit the largest ( Fig. 11 ), finely crenulate or smooth. Axilla smooth, with sparse scattered setae. Axillar depression with dense pilosity and without sculpture. Lateral scutellar pits absent. Posterior scutellar pits subequal, small and deep, lateral rim weakly sculptured to smooth. Metascutellum narrow, with long setae, three longitudinal keels (median keel low, lateral keels high) and distinct transverse carina developed between lateral keels. Propodeum in dorsal view strongly transverse, 2.24‒2.35 times as wide as long, entirely pubescent. Median propodeal keel projecting into low spine directed backward. Propodeum with posterior margin in dorsal view not arcuate. Lateral keels of propodeum forming very short plical process. Nuchal area sculptured, with pilosity.

Forewing. Venation yellow to dark brown. Costal and submarginal veins tubular and pigmented, basal vein paler. Marginal vein elongate, postmarginal vein gradually narrowed apically. Stigmal vein twice longer than width of marginal vein and broadened apically. Forewing 2.58‒2.72 times longer than maximum width.

Metasoma. Petiole as long as wide, weakly broadened posteriorly, with longitudinal striae dorsally and pubescence ventrally. Base of T2 with deep median and lateral notches; area between the notches striate ( Fig. 13 ); posteriorly T2 smooth and bare; T3‒T5 narrow, smooth, with rare erect setae. T6 and T7 pubescent. S2 with lateral fold at base and smooth posteriorly; covered with scattered long setae more dense at base and along setal line ( Fig. 12 ).

Variation (female). Length of body 1.0–2.1 mm. Colouration strongly variable: head black to dark brown; mesosoma and petiole black to pale brown; gaster dark brown to yellow. Head, mesosoma and petiole always distinctly darker than metasoma without petiole. Venation yellow to dark brown. Female А4‒А8, or А7‒А8, or only А8 transverse. А2=A3 to A2 distinctly longer than А3. Male А1‒А3 yellow to brown, following segments dark red to dark brown. Medial pit of anterior scutellar pits crenulate to smooth. Notauli with reticulation at bottom, rarely smooth. Legs yellow to brown.

Male. Body length 1.1–2.4 mm; fore wing length 0.9–2.2 mm; antenna length 0.9‒2.2 mm. Similar to female, but differs mainly in antennal structures and metasoma proportions. Antenna filiform, А1‒А3 yellow to brown, following segments dark red to dark brown, А1 and А2 always faintly paler than remainder antennomeres. Pubescence of A3‒A13 semidecumbent and sparse. Ratios of length to width of antennomeres in dorsal view: A1 12:2.7; A2 4:2.2; A3 5.5:2; A4 7:3; A5 5.5:2.2; A6 6:2.2; A7 6:2; A8 6:2; A9 6:2; A10 6:2; A11 6.5:1.8; A12 6.5:1.8; A13 9:1.8. A4 keel extends from base to almost apex of segment. A5‒A13 elongate, cylindrical. Apical segment long and slender, pointed apically.

Figures

FIGURES 1‒4. Idiotypa maritima (Haliday, 1833) (1, 2) and I. mariae Gregor, 1939 (3, 4). 1, 3) lateral habitus (scale bar = 0.5 mm); 2, 4) mesosoma in lateral view (scale bar = 0.2 mm).

FIGURES 5‒10. Idiotypa maritima (Haliday, 1833) (5, 7, 9) and I. mariae Gregor, 1939 (6, 8, 10). 5, 6) antenna of female in ventral view (scale bar = 0.5 mm); 7, 8) A2‒A6 of male in dorsal view (scale bar = 0.2 mm); 9, 10) A2‒A6 of male in lateral view (scale bar = 0.2 mm).

FIGURE 11–15. Idiotypa maritima (Haliday, 1833) (11–13) and I. nitens (Szabó, 1961) (14–15), females: 11, 14) whole insect, in dorsal view (scale bar = 0.5 mm); 12) petiole and base of S2 in ventral view; 13, 15) petiole and base of T2 in dorsal view.