Janus nasutus, Basov, 2024

Basov, S. A., 2024, Review of the genus Janus Stephens, 1829 (Hymenoptera: Symphyta: Cephidae) of the Russian fauna, Far Eastern Entomologist 500, pp. 1-12 : 5-7

Janus nasutus sp. n.

https://zoobank.org/NomenclaturalActs/ 5470F94E-4B31-4DD6-8943-E02A6C32301E

Figs 2A–H

TYPE MATERIAL. Holotype: ♂, Russia: “ 5 km SSV [ NNE] of st.[antziya]

Khasan, Yu.[zhnoe] Primorie, A. Zinovjev, 26. V 1979 ” [ ZISP].

Measurements. Total body length: 8.0 mm; fore wing: 6.6 mm.

Colour. Head, most of thorax, first and most of second abdominal tergites black. Mandibular yellow with orange tips of tooth and black stripe basally. Wide pattern along posterior margin of pronotum, tegulae, large spot on mesopleuron, concave areas of metanotum and metapostnotum yellow. Two basal antennal segments black, remaining segments dark brown above and yellowish-brown below. Coxae yellow with small black spot at base. Remaining parts of fore and middle legs yellow. Hind legs with yellow trochanters, orange femurs and dark brown apices of tibiae and tarsus. Abdomen starting from apex of second tergite orange. Wings hyaline, veins and pterostigma light brown. Setae of body whitish-yellow.

Sculpture. Face and clypeus densely punctured, spaces between punctures smooth and shiny. Vertex finely punctured; temple behind eyes smooth and shiny. Thorax and abdomen weakly and evenly punctured.

Head. Malar space as long as diameter of median ocellus; distance between antennal toruli about as long as distance between torulus and inner margin of eye ( Fig. 2G ). Interantennal carina high and rounded, significantly protruding above antennae (lateral view); its ends abruptly in front of clypeus and forming rounded elevation. Maxillary palp as in Fig. 2D , palpomere 2 and 3 combined near as long as palpomere 4; palpomere 3 as long as palpomere 6. Labial palp as in Fig. 2E , ratio of palpomeres 1: 2: 3: 4 as 2.5: 1.8: 1: 2.8. Vertex not convex, not limited by lateral sutures, strongly longitudinally elongated. OOL: POL = 0.9, OCL: POL = 2.3. Length of antenna 2.5 × maximum width of head; antenna with 23 antennomeres.

Legs. Hind tibia with two pre-apical spurs. Claw with basal lobe, its inner tooth (first of three) as long as apical tooth.

Abdomen. Subgenital plate apically rounded. Genital capsule as in Figs 2I, J . Valviceps almost parallel-sided dorsally, their apical part flat.

Female. Unknown.

COMPARATIVE DIAGNOSIS. The new species is similar to Janus compressus , but differs from latter in the genital structures: valviceps almost parallel dorsally and their apical part is flat (valviceps converging dorsally to apex at acute angle and their apical part protrudes at obtuse angle in J. compressus ), body length 8.3 mm (6.0–8.0 mm in J. compressus ) and more pronounced yellow coloration of pronotum and mesopleuron (mesopleuron completely black, pronotum with only narrow yellow border along its posterior margin in J. compressus ).

DISTRIBUTION. Russia: Far East (Primorsky Territory).

HOST PLANT. Unknown.

ETYMOLOGY. The specific name is given from the Latin word " nasutus " meaning "big-nosed", because the face between antennae is strongly convex, sharply ending in rounded bump, similar to a “nose”.

Figures

Fig. 2. Janus nasutus sp. n., holotype, male. A – habitus, dorsal view; B – pronotum, dorsal view; C – mesopleura, lateral view; D – maxillary palp; E – labial palp; F – left mandibula, frontal view; G – face, frontal view; H – hindleg, lateral view; J – genital capsule, dorsal view; K – genital capsule, ventral view.