Picrostigeus ventrodentatus Mohammadi-Khoramabadi & Talebi, 2024

Mohammadi-Khoramabadi, Abbas & Talebi, Aliasghar, 2024, Three new species of the genus Picrostigeus Förster, 1869 (Hymenoptera: Ichneumonidae, Orthocentrinae) from Iran, Zootaxa 5471 (5), pp. 585-593 : 591-592

Picrostigeus ventrodentatus Mohammadi-Khoramabadi & Talebi , sp. nov. ( Fig. 4 )

Type material. Holotype: female, Iran, Qazvin, Zereshk , 36°25′398″N, 50°06′628″E, 1926 m a.s.l. 2011.09.27 – 2011.10.11., leg. A. Mohammadi-Khoramabadi. Paratypes: female, Iran, Qazvin, Zereshk , 36°25′398″N, 50°06′628″E, 1926 m a.s.l. 2011.09.27 – 2011.10.11., leg. A. Mohammadi-Khoramabadi. ; male, Iran, Qazvin, Zereshk , 36°25′398″N, 50°06′628″E, 1926 m a.s.l. 2011.09.27 – 2011.10.11., leg. A. Mohammadi-Khoramabadi. ; 2 females, Iran, Qazvin, Zereshk , 36°25′398″N, 50°06′628″E, 1926 m a.s.l. 2011.09.27 – 2011.10.11., leg. A. Mohammadi-Khoramabadi. The holotype and 1 female and 1 male paratype specimens are card-mounted and are deposited in TMCU and 2 female paratype specimens are card-mounted and deposited in BMNH .

Diagnosis. The new species is similar to P. antennalis Roman, 1909 and can be differentiated by the following character states in combination: female with longer ovipositor, Ovp/ht= 1.40; temple slightly narrowed behind compound eyes; antenna with longer first flagellomeres; Lwffl= 2; propodeum with the basal part of median longitudinal carina present; first tergite coriaceous; male with quadrate parameres having a distinct triangular projection at the lower corners ( Fig. 4A ).

Description. Female. Body length ca. 2.00 mm, fore wing length ca. 2.00 mm.

Head: Antenna with 27 flagellomeres, first flagellomere ca. 2.00× as long as its apical width (Lwffl= 1.9), 2 nd, 3 rd and 4 th flagellomeres ca. 1.7, 1.6 and 1.4× as long as apical width, respectively, the rest cubic; Face coriaceous; vertex smooth; temple slightly narrowed behind eyes.

Mesosoma: Thorax smooth; fore wing with areolet open, vein 3 rs-m absent, vein 2 rs-m 1.6× as long as 2M; propodeum with the basal part of the median longitudinal carina and posterior transverse carina present; area superomedia coriaceous.

Metasoma: First tergite coriaceous with dorsal median carina absent; tergite 2 on transverse, smooth; Ovp/ht= 1.40.

Color: Black species. Legs pale red; metasomal tergites dark brown.

Male: ( Figs. 4A–C ). Body length ca. 3.00 mm, fore wing length ca. 2.50 mm.

Head: Antenna with 25 flagellomeres, first flagellomere 2.6× as long as apical width (Lwffl= 2.6) ( Fig. 4B ), all flagellomeres longer than wide; face smooth; temple slightly narrowed behind eyes.

Mesosoma: Thorax smooth; metapleuron finely coriaceous near hind coxa; propodeum not carinated; fore wing with vein 3 rs-m absent (areolet open), vein 2 rs-m 1.6× as long as 2M.

Metasoma ( Fig. 4C ): First tergite smooth, with median dorsal carina absent; 2 nd tergite on smooth; parameres quadrate with a distinct triangular projection at the lower corners ( Fig. 4A ).

Color: Head black; Face white; frons to the basal half white; temple at the basal half white; prothorax white, pronotum with a black stripe at the middle; mesopleuron black with a white spot below tegula; legs yellow except for fore coxa, fore trochanter, fore trochantellus, fore femur, mid coxa, mid trochanter, mid femur, and hind trochanter white.

Distribution. Iran (Qazvin province).

Etymology. The specific epithet ventrodentatus is a Latin adjective derived from the two words venter and dent, meaning a dent-like structure at the ventral part; it refers to a triangular dent-like structure on the lower corner of male parameres of the new species.

Ecology remark. Host unknown. The area of collecting specimens of the new species is situated on the southern slopes of the Alborz Mountain range at an altitude of 1926 m a.s.l.. The climate in this region is semiarid.

Figures

FIGURE 4. Picrostigeus ventrodentatus Mohammadi-Khoramabadi & Talebi, sp. nov.. A. Male holotype, B. Male antenna, C. Male wings.