Nysson kazenasi Nemkov and Gayubo

Nemkov, Pavel G. & Gayubo, Severiano F., 2003, A new species of Nysson Latreille (Hymenoptera: Crabronidae: Bembicinae) from Turkmenistan, Zootaxa 144, pp. 1-4 : 2-4

Nysson kazenasi Nemkov and Gayubo , sp. nov. ( Figs. 1­5 )

Etymology. The species is dedicated to the famous hymenopterist Prof. V. L. Kazenas, who collected the type series.

Type material: Holotype ,, TURKMENISTAN: Kara Kum desert near Repetek, 9.V 1990 (Kazenas) (Zoological Institute of Russian Academy of Sciences, St. Petersburg, Russia); paratypes, 2, 3, TURKMENISTAN: Kara Kum desert near Repetek, 6, 7, 9, 19.V 1990 (Kazenas).

Diagnosis. Nysson kazenasi is unique among Palaearctic Nysson in having the hypoepimeral area strongly swollen like a hollow, longitudinal conical­shaped structure. Other distinctive features are: clypeus with surface regularly convex; free margin of clypeal lobe straight or minimally concave; low occipital carina well­defined, not joining hypostomal carina; frons densely punctate, with subcontiguous punctures; collar with broadly rounded lateral sides; scutum with a well­defined longitudinal median sulcus; propodeal dorsum well­developed and with two clear marginal carinae; propodeal spines moderately developed; sternum II with a clear double punctuation.

Additional diagnostic features are, in males: last antennal joint simple (without ventral concavities), last tergum depressed and apically tridentate; in females: last sternum with a smooth median longitudinal carina and apically pointed.

Nysson kazenasi is a species morphologically similar to N. humilis Handlirsch an N. pusillus Beaumont in having fundamentally a similar occipital carina, appressed whitish setae concealing some parts of the body such as the mesopleuron, similar free margin of clypeus and last antennal joint simple in males.

Description. FEMALE. Body length 4.5­4.6 mm. Clypeus noticeably regularly convex; its anterior margin approximately trapeziform, with turned anterad narrow border ( Fig. 3 ). OAD:WAS:IAD =10:8:4Inner eye margins slightly emarginated above middle. IODa :IODo =1.5. Frons weakly convex, with slender median line in lower half. OOD:Od:POD =14:9:14. Low occipital carina well­defined, not joining hypostomal carina. Antenna rather short, somewhat clavate; A3L:W =1.4, A12L:W =1.0, A13L:W=1.4; last joint strait, rounded apically. Pronotal collar broadly rounded laterally, not angular. Scutum with a well­defined longitudinal median sulcus in the shape of a deep furrow which is gradually vanished posterad. Hypoepimeral area of mesopleuron strongly swollen like a hollow longitudinal conical­shaped structure ( Fig. 1 ). Propodeal dorsum well­developed, with two clear marginal carinae. Propodeal spines moderately developed. Gastral terga and sterna simple, not double edged. Sternum II gently rounded. Sternum VI with smooth obtuse median carina in posterior half and pointed apically. Pygidial plate almost flat, moderately wide, approximately triangular ( Fig. 4 ). Media of hindwing diverging after cu­a.

Body with characteristic whitish setae, appressed and concealing integument on upper two thirds of clypeus, lower half of frons, mesopleuron and posterolateral parts of dorsal propodeal surface.

Lower half of clypeus smooth and shining with several medium­sized points. Upper half of clypeus, frons, vertex and temples semidull, with very dense subcontiguous micropunctures. Pronotum, scutum, all gastral terga including pygidial plate and sterna III­VI rather shiny, with uniform small dense punctures (space between each equal to or less than their diameter). Sternum II with a clear double punctation (micropunctures with regular distribution and 1­2 diameters apart; macropunctures with irregular distribution and 1­5 diameters apart). Mesopleuron smooth and shiny, with sparse medium­sized points. Metapleuron smooth and shiny, without punctures. Propodeum rather gently irregularly striatereticulate dorsally and posteriorly, nearly smooth and dull laterally.

Body black, gaster mainly brownish­red. Antennae and legs red; most of scapus, pedicellus, interrupted in the middle stripe on pronotal collar, humeral angles, spot on mesopleural longitudinal conical ­ shape structure, small spot on tegula, interrupted in the middle or unbroken bands on terga I­V, large spots on apex of fore­ and midfemurs, exterior surface of all tibiae yellowish­white. Wings hyaline. Veins and stigma dark­brown.

MALE. Body length 4.5­4.6 mm. As in female except: antenna rather clavate, not modified ( Fig. 2 ); A3L:W =1.3, A12L:W =0.9, A13L:W =1.3; gastral sterna without hairbrushes or fimbriae, last sternum not modified; last tergum depressed and apically tridentate, median tooth shorter and wider than lateral ones ( Fig. 5 ).

Distribution. Turkmenistan.

Natural History. According to the labels, the type specimens were collected in sand desert.

Figures

FIGURES 1 ­ 5. Nysson kazenasi sp. nov. 1, female hypoepimeral area of mesopleuron; 2, male antenna; 3, female clypeus; 4, female pygidial plate; 5, male tergum VII.