Sinotilla ohbayashii Okayasu, 2017

Okayasu, Juriya, 2017, Two new species of the genus Sinotilla Lelej, 1995 (Hymenoptera: Mutillidae), with notes on taxonomic characters, Zootaxa 4294 (2), pp. 151-169 : 156-159

Sinotilla ohbayashii Okayasu , sp. nov.

( Figs 9–16 , 29–30 )

Diagnosis. FEMALE. This species can be separated from other species of group 2 by the following combination of characters: scutellar scale narrow, about twice the diameter of nearby punctures; propodeum without median longitudinal carina; S2–S4 each with apical narrow band of golden setae. MALE. Unknown.

Description. FEMALE. Color and setae. Head black, covered with golden setae; labrum yellowish red; setae on malar space dense; clypeus with long, golden setae; eye edged with long erect black setae. Mandible yellowish red with apical 1/3 black, with long erect golden setae. Scape and pedicel entirely reddish yellow; flagellum black, ventral face of F1–F4 yellowish red, ventral face of F5–F10 tinged with yellowish red; setae on F2–F10 pale golden, extremely short and fine. Palpi dark reddish yellow except first segment of maxillary and labial palpus reddish yellow.

Mesosoma and legs entirely yellowish red, covered with golden setae; propleuron and lateral face covered with short golden setae, mixed with pale golden, long and erect setae on propleuron and mesopleuron; setae on tarsi dense.

Metasoma black except T1 laterally and S1 yellowish red, without bluish metallic luster, covered with golden setae except T4 –T5 with blackish golden setae; T1 densely covered with golden setae posteriorly; T2 covered with short black setae mixed with golden setae; T2 with a large, drop-shaped, basal median spot of dense, appressed golden setae; T2 with apical band of dense, appressed, golden setae, slightly widened medially; minimum distance between median spot and apical band of T2 almost equal to maximum breadth of the spot; T2 with golden felt line laterally, lateral length of T2:length of felt line = 100:25; T3 with wide uniform band of dense, appressed golden setae; T2 and S2 shining; S2–S4 each with apical narrow band of dense, appressed golden setae; S1–S6 each with apical fringe of long golden setae. Pygidial area glabrous, edged with golden setae laterally.

Structure. In dorsal view, head obtrapezoidal with anterior margin slightly protruding, 1.6 times wider than long; lateral margins strongly convergent posteriorly behind eye; posterior margin truncate; postero-lateral angle rounded. In lateral view, head longitudinally elongated; frons flat; gena comparatively narrow in lateral view with GOI = 1.56. Surface densely and strongly punctate; frons and vertex closely punctate and longitudinally striated; frons and vertex with weak and long carina medially, which turning into short and deep groove at the end on frons; genal carina present; minimum distance between mandibular base and hypostomal teeth 6/7 times as malar space; antennal scrobe with weak carina. Eye oval with ratio between height and maximum breadth = 74:53. Clypeus with protruding transverse lamellate carina on anterior margin, and with median longitudinal tubercle. Mandible slender with a small rounded projection near apex and with a distinct preapical inner denticle. Scape strongly bending; F1 not long and slender, almost equal F2; F3 long, 1.6 times F2; F10 compressed with ventral face weakly and elliptically concave postero-laterally. Maxillary palpus six-segmented; segment 1 extremely short and conical; segment 2 almost baculiform and weakly compressed, broadest medially; segments 3–6 completely compressed; segment 3 strongly widened to apex; segment 4 weakly widened to apex; segments 5 and 6 narrow and straight. Labial palpus four-segmented; segment 1 baculiform; segments 2–4 compressed; segment 2 strongly widened to apex, wedge-shaped; segment 3 broadest near base and narrowed to apex; segment 4 narrow, baculiform and slightly bending.

Mesosomal width 0.6 × length; lateral margins subparallel, constricted at propodeal spiracle; propodeum as wide as pronotum, relative width of head:pronotum:mesonotum:propodeum:metasoma = 100:85:75:85:125; dorsal face densely and strongly punctate; lateral face almost entirely smooth; anterior margin of pronotum with a pair of weak and small teeth; lateral margins very weakly crenulate and pronotum with a small lateral tooth; propodeal face without median longitudinal carina. Scutellar scale narrow, about twice the diameter of nearby punctures.

Mid- and hind tibiae each with two parallel longitudinal row of spines on outer face; claws simple, without denticles.

Metasoma oval and entirely punctate; punctures on T1 sparse on anterior face, dense posteriorly; punctures on S1 shallow and indistinct; punctures on T2 large and dense, regularly punctate; T2 broadly and shallowly depressed medially; punctures on S2 dense, separated by about 0.6 times puncture diameter, medially and antero-laterally sparse and separated by about twice the puncture diameter maximally; segments 3–6 micro-punctate; S1 with median longitudinal carina; S2 slightly concave antero-laterally, and with median longitudinal, narrow impunctate line anteriorly; T2 and S2 shallowly micro-punctate among punctures; S6 with a pair of small teeth on posterior margin. Pygidial area unsculptured, polished and remarkably convergent basally with lateral margins not carinated even apically.

Measurement. (n = 1). Body length: 10.2 mm. Head width: 2.1 mm. CED = 15/11. REP = 19/66. RML = 7/17. Ratio between length and width of pedicel (in dorsal view) and F1–F10 = 10:20; 20:25; 18:26; 29:24; 21:23; 20:21; 20:19; 19:19; 17:14; 17:14; 30:16, respectively. Relative length of each segments of maxillary palpus = 8:24:30:40:38:40; relative length of each segments of labial palpus = 14:19:22:35.

MALE. Unknown.

Type material. Holotype: ♀, Wuyishan, Dujia, Fujian, China, 31.V.2002, Nobuo Ohbayashi & Li-Zhen Li leg. [EUM].

Distribution. China: Fujian.

Etymology. The specific name ohbayashii is dedicated to Dr. Nobuo Ohbayashi, a well-known expert of longicorn beetles ( Coleoptera : Cerambycidae ), who collected the type specimen during his expedition to China. He is also a devotee of mutillids and skillful in collecting them.

Remarks. Sinotilla ohbayashii sp. nov. is known only by holotype, and similar to females of S. belokobylskiji , S. lambirensis , S. petina and S. calopoda sp. nov. in having the characters of group 2. However, this new species can be distinguished from S. petina by the golden setae on frons and vertex (black in petina ), the golden setae on dorsal face of mesosoma (dark in petina ), and having apical narrow band of setae on S2–S3 (lacking in petina ), from S. belokobylskiji by the golden setae on frons, vertex and dorsal face of mesosoma (black in belokobylskiji ) and narrow scutellar scale (wide in belokobylskiji ), and from lambirensis by the larger body size, the golden setae covering the body (pale golden in lambirensis ), the mandible with one inner denticle (two in lambirensis ) and having a median groove on frons (lacking in lambirensis ). This new species also differs from S. calopoda sp. nov. in golden setae covering the body (pale golden in calopoda ), lateral margins of mesosoma constricted at propodeal spiracle (not constricted in calopoda ), S1 yellowish red (black in calopoda ), S2 smooth and shining among punctures (rough and dimly shining in calopoda ), propodeal face of mesosoma punctate (medially and longitudinally striated in calopoda ), and in lacking median longitudinal carina on propodeal face (present in calopoda ).

Sinotilla calopoda sp. nov. and S. ohbayashii sp. nov. also resembles S. subparallela in subparallel lateral margins of mesosoma, but differs in having a median spot of setae on T2 (lacking in subparallela ), mandible with one or two inner denticles (mandible without inner denticles in subparallela ) and the black T1 (yellowish red in subparallela ).

Figures

FIGURES 9 – 11. Sinotilla ohbayashii sp. nov., ♀, holotype, habitus. 9. Dorsal view; 10. Lateral view; 11. Ventral view. Scales = 2.0 mm.

FIGURES 12 – 16. Sinotilla ohbayashii sp. nov., ♀, holotype. 12. Head, frontal view; 13. Mesosoma, dorsal view; 14. Pygidial area; 15. Propodeum, dorsal view; 16. Metasoma, dorsal view. Scales: 12 – 15 = 0.5 mm, 16 = 1.0 mm.

FIGURES 27 – 30. Sinotilla spp., ♀♀, head. 27 – 28. S. calopoda sp. nov. 29 – 30. S. ohbayashii sp. nov. 27, 29. Dorsal view; 28, 30. Lateral view. Scales = 0.5 mm.