Pantolyta chemyrevae Brazidec & Vilhelmsen 2022, sp. nov.

Pantolyta chemyrevae sp. nov.

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Fig. 5A–C, Table 1

Diagnosis

Eye round, extending at most a fourth of head length; scape as long as pedicel and first three flagellomeres combined; F1 two times as long as wide, narrower than pedicel; F2–F13 gradually widening towards apex (Fig. 5A–B); epomia present; anterior scutellar pit suboval, wider than shortest distance between notauli; plicae projecting posteriorly; fore wing not reaching middle of propodeum (brachypterous morph; Fig. 5A–B); petiole slightly longer than wide (Fig. 5C); gaster fusiform, elongate and tapering at apex; T2 striated dorsally at junction with petiole; ovipositor long, subequal in length to gaster (Fig. 5A).

Etymology

The species is dedicated to Vasilisa Chemyreva, Russian entomologist, in acknowledgment of her numerous publications on Diapriidae from the Palearctic region. The specific epithet is to be treated as a noun in the genitive case.

Type material

Holotype NHMD-608448, a complete female partially hidden by a milky coat.

Locality and horizon

Baltic amber is considered to be of Bartonian–Priabonian age, ca 34–38 Ma.

Description

Female

BODY. BL = 2.43 mm. Head smooth, bare (HeL = 0.37 mm); eye round, small, less than a third of head length (ED = 0.11 mm); antenna bearing numerous short setae; toruli separated by shallow cleft; scape as long as pedicel and first three flagellomeres combined, at least as long as head; pedicel three times as long as wide; 13 flagellomeres; F1 two times as long as wide, narrower than pedicel; following flagellomeres gradually widening towards apex; F13 largest and longest of all (antennomeres length of holotype, in mm: Sc-0.46; P-0.16; F1-0.12; F2-0.08; F3-0.08; F4-0.08; F5-0.09; F6-0.08; F7-0.08; F8- 0.08; F9-0.08; F10-0.10; F11- 0.10; F12; 0.11; F13-0.19); mandibles simple, just crossing at tip; labial palpi three-segmented, first long, second narrowing at apex and third wider.

MESOSOMA. Shorter than metasoma (MsL = 0.75 mm); pronotum not elongate, epomia present; notauli deep and complete, convergent posteriorly; anterior scutellar pit suboval, wider than shortest distance between notauli; mesopleuron bare, with epicnemial pit and carina present; propodeum with plicae projecting posteriorly, forming teeth, median propodeal keel simple. Fore wing reduced, not reaching middle of propodeum (FwL = 0.32 mm). Hind wing shorter (HwL = 0.17 mm). Legs slender with few unorganized erect setae; tibial spur formula 1-2-2; tarsal claws simple.

METASOMA. Petiole cylindrical, slightly longer than wide (PtL = 0.20 mm; PtW = 0.18 mm), with distinct longitudinal sculpture, and short hairs dorsally; gaster subcylindrical, elongate and tapering at apex (GL = 1.11; GH = ca 0.40 mm); T2 and S2 longest; T2 slightly striated dorsally at junction with petiole; T6 and T7 not clearly separated and forming long triangle; ovipositor exerted, slightly shorter than gaster (OL = 0.89 mm).

Male

Unknown.

Comments

Using Nixon’s (1957) key, Pantolyta chemyrevae sp. nov. keys out to Pantolyta Förster, 1856 because of the following characters: brachypterous, toruli rims without a distinct cleft, antennae 15-segmented, epomia on pronotum defined at pronotal collar, notauli present on mesoscutum, lower side of gaster slightly down curved. With the keys to species of Pantolyta provided in Chemyreva & Kolyada (2019) and Nixon (1957), P. chemyrevae keys out near P. stylata Kieffer, 1908 (= P. vernalis sensu Nixon 1957) but has the antennal shelf less prominent and a longer scape (Chemyreva & Kolyada 2019).

Among the Baltic amber species, it differs from other Pantolyta species as follow: P. antiqua is macropterous and has F1 more than two times as long as pedicel; Pantolyta augustinusii has the toruli separated by a distinct cleft, the mesoscutum bearing long hairs and the plicae not projecting posteriorly; P. janzeni and P. perrichoti has a longer petiole, more than two times as long as wide; P. somnulenta is very similar to P. chemyrevae sp. nov. but is macropterous, has anterior scutellar pit narrower than P. chemyrevae and the plicae less produced posteriorly.