Dinetus tunisiensis Khedher et Mokrousov, 2020

Mokrousov, Mikhail V. & Khedher, Hassib B., 2020, Descriptionoftwonew speciesofDinetus Panzer, 1806 (Hymenoptera: Crabronidae Dinetinae) with key to species, Zootaxa 4853 (1), pp. 117-125 : 119-122

Dinetus tunisiensis Khedher et Mokrousov , sp. nov.

( Figs 8–16 )

Diagnosis. A member of the D. cereolus species group, which includes also D. venustus de Beaumont, 1957 , D. cereolus Morice , D. pulawskii de Beaumont, 1960 , D. nabataeus de Beaumont, 1960 , D. porcellaneus Guichard, 1980 and is characterized by having the apex of the marginal cell and second section of the cubital vien of the subdiscoidal cell oblique ( Fig. 12 ); females (and males except D. venustus ) have smooth and shiny head and mesosoma with very sparse microscopic points and setae (except spots of appressed silvery pubescence) ( Figs 8–11 ; 14–16 ); males have flagellomere I elongate, comparable in length with the scape. From all species of the cereolus group, it differs by its greater ocellocular distance ( Fig. 9 vs Fig. 17 ) and dark coloration (mid and hind femora completely black; metasoma black with white lateral spots only on tergum 2).

Material examined. HOLOTYPE, ♀: Tunisia, Djerba Is., / 2 km NE Agir , / 33.773203ºN, 11.037778ºE / 15.V 2019 Mokrousov M. [ ZISP] . PARATYPES: 1♀, 4♂ with the same labels as holotype [1♂ in ZISP; 1♀, 3♂ in MMC]; Tunisia, Mahdia, Sidi Alouane, Saguiet Elkhadem , N 35°22’36.2”, E 10°52’30.9”, 53 m, 29. VI.2019, 5♀, 3♂, H. Ben Khedher leg. [1♀ in ZISP, 3♀ and 2♂ in RRC, 1♀ and 1♂ in AUBM]; Tunisia, Mahdia, Sidi Alouane, Zelba , N 35°13’48.8” E10°51’30.1”, 50 m, 17. VI.2019, 3♀, 1 ♂, leg H. Ben Khedher, [2♀ and 1♂ in RRC, 1♀ in AUBM] .

Description. Female. Body length 4.9–5.5 mm (holotype 5.1 mm); fore wing length of holotype 3.1 mm.

Head 1.1× as wide as long in frontal view. Eyes diverge sharply downward, ratio of minimal distance at vertex to maximal below is 0.48×. Ocellocular distance slightly shorter than hind ocellar diameter. Occipital carina well developed dorsally, evanescent ventrally. Clypeus with apical short lamella. Basal ventral surface of mandible with well developed tooth and weak notch distally; apical part of inner side with two small additional teeth (second tooth sometimes absente). Antenna elongate; scape elongate, it length more than half frons height; ratio length of scape and flagellomeres I, II, III is 0.9:1:0.7:0.6. Head with delicate shagreen sculpture, stronger in lower half of frons and lateral parts of clypeus, with sparse fine punctures, denser behind ocelli and very short setae. Anterior edge and basal central part of clypeus with row of punctures and stout setae. Gena with well developed psammophore.Appressed silvery pubescence not developed. Mesosoma with delicate shagreen sculpture, more developed on lateral part of pronotum and mesopleuron. Mesopleuron under wing base and propodeum postero-laterally with developed silvery pubescence. Punctures very sparse and fine, more noticeable on mesonotum and ventral part of mesopleuron. Propodeal enclosure with shagreen sculpture, with oblique basally and transverse apically slight rugosity. Setae sparse and very short, longer on ventral part of mesopleuron. Propleuron with long setae of psammophore. Fore coxa with one very long apical stout seta; fore trochanter with long setae of psammophore; fore femur flattened ventrally and keeled posteriorly, with long setae of psammophore; tibia with anterior and posterior rows of several bristles; tarsal rake well developed, spines slightly expanded, fore tarsomere I with six spines; apical tarsomeres elongate, near parallel sided, with lateral stout spines; hind coxa with silvery pubescence dorsally. Fore wing marginal cell apex and second section of cubital vien of the subdiscoidal cell oblique; hind wing media diverging at cubito-anal crossvein. Metasoma with delicate shagreen sculpture, sparse punctures and very short setae; tergum 2 with small apicolateral spot of silvery pubescence; pygidium slightly elongated, smooth, with several punctures; sterna 2–5 with apical and sternum 6 over entire surface with sparse stout erect setae.

Black with brownish and yellow pattern ( Fig. 8 ). Brownish or ferruginous are: anterior edge of labrum, mandibles (except apex); bottom of scape and flagellomere I; fore tibia (except darkened stripe in inner side) and fore tarsus. Yellow or whitish yellow are: apex of pronotum (“neck”), pronotal collar; tegula, base of wing and adjacent areas of mesosoma, mesopleuron spot under base of wing, scutellum; metanotum; narrow ring of propodeal apex, lateral spots on tergum 2. Pronotal tubercle with yellowish edge (in holotype) or completely dark (in paratype). Trochanters with yellow apical narrow band ventrally.

Male. Body length 4.0– 4.5 mm; fore wing length 2.3–2.5 mm.

Head 1.2× as wide as long in frontal view. Eyes diverge sharply downward, ratio of minimal distance at vertex to maximal below is 0.55×. Ocellocular distance as hind ocellar diameter. Clypeus with apical short lamella. Antenna elongate; scape large, broadened in middle, it length more than half frons height; ratio length of scape and flagellomeres I, II, III is 1:1:0.7:0.6; flagellomeres V–XI flattened, IV–IX with ventral weak indentation. Head with shagreen sculpture, stronger in lower half of frons and vertex, with denser punctures near ocelli and very short setae. Weak silvery pubescence developed only on sides of antennal pits. Psammophore reduced to sparse thin setae. Fore trochanter without apical tooth; fore femur with slightly limited longitudinal depression, without tooth; tibia without anterior and posterior rows of bristles, only with single bristles; tarsal rake weak developed, fore tarsomere I with one central and one apical spines; hind coxa with silvery pubescence dorsally. Metasoma with delicate shagreen sculpture, sparse punctures and very short setae; sterna 2–6 with apical and sternum 7 over entire surface with sparse stout erect setae. Occipital area, mandible, mesosoma, fore coxa and wings as at female.

Coloration similar to female ( Fig 14 ), but yellow coloration more developed on head (mandibles, except apex, clypeus, lover frons and gena are yellow), fore femur with obscure apical spot. Pronotal tubercle black or with yellow edge.

Etymology. The specific name means in Latin “from Tunisia ”.

Distribution. Tunisia.

Figures

FIGURES 8–13. Females of Dinetus tunisiensis Khedher et Mokrousov, sp. nov., holotype (8, 13) and paratype (9–12). 8, habitus in dorsolateral view. 9, head in dorsal view. 10, head in frontal view. 11, scutellum, metanotum and propodeum in dorsal view. 12, fore wing. 13, labels.

FIGURES 14–16. Male of Dinetus tunisiensis Khedher et Mokrousov, sp. nov., paratype. 14, habitus in dorsolateral view. 15, head in frontal view. 16, head in dorsal view.

FIGURES 17–21. Females of Dinetus venustus de Beaumont, 1957 (17) [IBER], Dinetus dentipes E. Saunders, 1910 (18) [MMC], male (19) and female (20, 21) of Dinetus pictus (Fabricius, 1793) [MMC]. 17, 20, head in dorsal view. 18, scutellum, metanotum and propodeum in dorsal view. 19, mesonotum, scutellum and metanotum in dorsal view. 21, fore wing.