Janzenella Masner & Johnson, 2007

Bremer, Jonathan, van de Kamp, Thomas & Talamas, Elijah J., 2021, Janzenella theia Bremer & Talamas (Platygastroidea, Janzenellidae): a new species from Baltic amber, Journal of Hymenoptera Research 87, pp. 223-233 : 223

Janzenella Masner & Johnson

Janzenella Masner & Johnson, 2007: 2 (original description. Type: Janzenella innupta Masner & Johnson, by monotypy and original designation).

Note.

Our generic description comprises the characters shared by J. innupa and J. theia , and thus is largely a reduction of the description of J. innupta provided by Masner & Johnson (2007). Two characters, the tibial spur formula and the morphology of internal apodemes, were not assessed for both species but are assumed to be stable within the genus. Nomenclature of internal structures follows Mikó et al. (2007).

Description.

Small, elongate, length 1.2-1.3 mm; body strongly depressed, with relatively short legs and antennae; macropterous.

Head. Head transverse in dorsal view, width 1.5 times length, somewhat narrowed medially; hyperoccipital carina absent, head in frontal view wider than high, height 0.8 times width; frons largely flat to weakly convex, smooth; interantennal process absent, torulus large, opening forward, lower rim of torulus nearly reaching oral cavity; submedian carina absent; orbital carina absent, lower frons reflexed ventrally; inner orbits rounded, diverging dorsally and ventrally; clypeus very small, triangular, not differentiated into postclypeus, anteclypeus; malar sulcus absent; malar and facial striae absent; labrum not visible externally; mandible short, robust, tridentate, teeth subequal in size; antenna 11-merous; radicle inserted apically into A1, nearly parallel to axis of A1; A1 short, strongly widened in apical half, apex excavate for reception of flagellum; A3 distinctly shorter than A2; A3-A5 globular; apical 4 antennomeres expanded into semi-abrupt clava in female; papillary sensilla on female antenna arranged in longitudinal pairs on apical antennomeres; claval formula A8-A11: 2-2-2-1.

Mesosoma. Mesosoma strongly depressed, in dorsal view longer than wide, in lateral view distinctly longer than high; pronotum in dorsal view narrowed laterally; subparallel to outline of mesoscutum, anterolateral corners rounded, anterior face extended forward into necklike elongation; transverse pronotal carina absent; vertical epomial carina absent; horizontal epomial carina present; lateral face of pronotum largely flat to weakly concave, without scrobe for reception of foreleg, anterior margin very finely foveolate; netrion absent; anterior margin of mesoscutum meeting pronotum dorsally; admedian lines absent; parapsidal lines absent, notauli absent; skaphion absent; mesoscutum with roughly circular punctate areas present on either side; transscutal articulation well developed, simple; scutellum wider than long, unarmed, nearly flat; metanotum extremely narrow, striplike, dorsellum not differentiated, keels, plicae of propodeum not developed; mesopleural carina absent; acetabular carina fine, anterior margin of ventral portion of mesepisternum straight, not projecting between fore coxae; posterior margin of mesopleuron with complete line of foveolae extending from base of forewing to mid coxa; episternal foveae absent; anteroventral portion of metapleuron rounded, not separated from lateral face by carina, metapleural pit not apparent; posterior margin of metapleuron rounded; metapleuron above hind coxa reticulate, otherwise smooth; lateral propodeum without longitudinal carinae, posterolateral corner not produced posteriorly, posterior margin broadly rounded; legs relatively short, slender, only hind femur somewhat enlarged; tarsal formula 5-5-5; forewing extending to apex of metasoma, R bifurcating apically, bulla absent; R1 absent or extremely short, therefore without postmarginal vein; r-rs (stigmal vein) present, at least longer than R1; hindwing with R very short; tibial spur formula: 1-2-2.

Metasoma. Metasoma weakly sclerotized, loosely articulated, depressed; T1-T3 subequal in length; 7 terga, 6 sterna visible externally; laterotergites extremely wide, no submarginal ridge present; laterosternites absent; no spiracles visible; anterior margin of segment 1 without anterior carina, T1 and S1 rounded and prolonged anteriorly into short neck that inserts into propodeal foramen; sutures between all segments simple, terga and sterna broadly overlapping; anterior margin of S2 straight; narrow sublateral felt fields absent.

Internal morphology.

Profurca without dorsal bridge, anterior profurcal lamellae forming long, slender processes that extend anteriorly over the basisternum; mesofurca Y-shaped, lacking an apparent dorsal bridge; metafurca slanted anteriorly, metafurcal arms simple, straight, rod-like.