Trissolcus vindicius (Nixon)

Talamas, Elijah J., Buffington, Matthew L. & Hoelmer, Kim, 2017, Revision of Palearctic Trissolcus Ashmead (Hymenoptera, Scelionidae), Journal of Hymenoptera Research 56, pp. 3-185 : 74-76

Trissolcus vindicius (Nixon) Figures 217-218 , 219-221

Microphanurus vindicius Nixon, 1938: 123, 128 (original description, keyed); Nixon, 1943: 137 (keyed); Risbec, 1950: 569 (keyed).

Trissolcus vindicius (Nixon): Masner, 1965: 128 (type information, generic transfer); Lê, 1983: 24 (keyed); Johnson, 1992: 640 (cataloged, type information); Lê, 2000: 312, 323 (description, keyed).

Description.

Female body length: 0.99-1.63 mm (n=18). Male body length: 1.44 mm (n=1). Body color: head, mesosoma, and metasoma black.

Head. Color of radicle: yellow. Length of radicle: less than width of clypeus. Color of A1-A6 in female: yellow to brown. Color of A7-A11 in female: brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: absent. Number of clypeal setae: 2. Microsculpture on gena directly above mandibular condyle: present. Shape of ventral gena in lateral view: narrow. Genal carina: absent. Malar striae: absent. Sculpture of malar sulcus: antero-posteriorly striate. Orbital furrow: expanding in size ventrally, strongly so at intersection with malar sulcus. Macrosculpture of frons between antennal scrobe and anterior ocellus: absent; weakly transversely strigose. Preocellar pit: present. Setation of lateral frons: moderately dense. Punctation of lateral frons: moderately dense. Sculpture directly ventral to preocellar pit: microsculptured. Macrosculpture of lateral frons: absent. OOL: separated by less than one ocellar diameter. Hyperoccipital carina: complete. Macrosculpture of posterior vertex: absent. Microsculpture on posterior vertex along occipital carina: present. Anterior margin of occipital carina: coarsely crenulate; finely crenulate to smooth.

Mesosoma. Epomial carina: present. Macrosculpture of lateral pronotum directly anterior to netrion: striate, striae formed by elongation of cells of netrion sulcus. Netrion sulcus: complete. Pronotal suprahumeral sulcus in posterior half of pronotum: clearly indicated by cells. Location of pronotal suprahumeral sulcus: percurrent. Number of episternal foveae: 4 or more. Course of episternal foveae ventrally: abutting postacetabular sulcus. Course of episternal foveae dorsally: extending to mesopleural pit. Subacropleural sulcus: present. Speculum: transversely strigose. Mesopleural pit: extending ventrally into dorsoventral furrow parallel to mesopleural carina. Mesopleural carina: well defined anteriorly, poorly defined to absent posteriorly. Sculpture of femoral depression: smooth. Patch of striae at posteroventral end of femoral depression: absent. Setal patch at posteroventral end of femoral depression: present. Microsculpture of anteroventral mesopleuron: present dorsally. Macrosculpture of anteroventral mesopleuron: absent. Postacetabular sulcus: formed by large cells. Mesopleural epicoxal sulcus: formed by large cells. Setation of posteroventral metapleuron: absent. Sculpture of dorsal metapleural area: smooth in anterodorsal corner, coarsely rugose posteriorly; cells of metapleural sulcus extending posteriorly into rugae. Posterodorsal metapleural sulcus: present as line of foveae; poorly defined to absent. Paracoxal sulcus in ventral half of metapleuron: indistinguishable from sculpture to absent; indicated by a line of elongate cells. Anteroventral extension of metapleuron: extending to base of mesocoxa. Metapleural epicoxal sulcus: present as clearly defined line of cells; present as coarse rugae. Mesoscutal humeral sulcus: indicated by a line of cells. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: absent; weakly rugulose anteriorly, otherwise absent. Pattern of mesoscutal microsculpture: uniform throughout; effaced posteriorly. Mesoscutal suprahumeral sulcus: comprised of cells. Length of mesoscutal suprahumeral sulcus: about half the length of anterolateral edge of mesoscutum. Parapsidal line: present. Notaulus: extending at least 1/3 length of mesoscutum. Median protuberance on anterior margin of mesoscutellum: absent; present. Protruberance on anterior margin of mesoscutellum directly posterior to notaulus: present. Shape of dorsal margin of anterior lobe of axillar crescent: round. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Area bounded by axillar crescent: striate. Macrosculpture of mesoscutellum: absent. Microsculpture on mesoscutellum: present throughout. Median mesoscutellar carina: absent. Setation of posterior scutellar sulcus: present.

Form of metascutellum: coarsely rugose. Metanotal trough: foveate, foveae occupying more than half of metanotal height. Metapostnotum: invaginated near lateral edge of metascutellum. Length of postmarginal vein: about twice as long as stigmal vein. Color of legs: coxae dark brown, legs elsewhere yellow. Anteromedial portion of metasomal depression: punctate or crenulate.

Metasoma. Longitudinal striae on T1 posterior to basal costae: present. Number of sublateral setae (on one side): 0. Setation of laterotergite 1: absent. Longitudinal striation of T2: present in anterior two-thirds of tergite. Setation of T2: present throughout posterolateral corner and lateral portions of tergite. Setation of laterotergite 2: present. Posteriorly directed setae on medial S1: present. Striation of S2: present in anterior half of sternite not covered by laterotergites. Setation of S2: present throughout area not covered by laterotergite.

Diagnosis.

Trissolcus vindicius is delimited more by a unique combination of characters than by a single distinctive feature. It can be separated from other species in the flavipes group by the presence of 2 clypeal setae, a well-defined and ventrally expanded orbital furrow, episternal foveae that extend from the postacetabular sulcus to the mesopleural pit, and a mesoscutum without a median mesoscutal carina. See also diagnosis of T. corai .

Link to distribution map.

http://hol.osu.edu/map-large.html?id=3331

Lectotype designation.

We here designate specimen B.M. TYPE HYM. 9.316 (deposited in BMNH) as the lectotype for T. vindicius .

Material examined.

Lectotype, female, M. vindicius : INDONESIA: Jawa Tengah Prov., Java Isl., Wonogiri Regency , 2000ft, 1937, J. S. Phillips, B.M. TYPE HYM. 9.316 (deposited in BMNH) . Other material: (18 females, 1 male) INDONESIA: 1 female, USNMENT00916385 (BMNH). JAPAN : 10 females, 1 male, OSUC144436, 144438, 144445, 144455, 144468, 542360-542361, 542368, 542375, 542426-542427 (CNCI). NEPAL : 2 females, OSUC 76418-76419 (OSUC). SOUTH KOREA : 5 females, USNMENT00896022-00896025, 00896148 (CNCI).

Comments.

The two specimens from Nepal fit within our concept of T. vindicius , but exhibit some notable variation. They are much smaller, have broader mandibles, the microsculpture of the mesoscutum is slightly effaced posteriorly, and the occipital carina is finely crenulate and nearly smooth along its anterior margin. In one specimen the episternal foveae are fewer in number and dorsoventrally elongate relative to the roughly circular shape that is typical for T. vindicius , possibly an allometric consequence of its smaller size.

Figures

Figures 217 - 218. Trissolcus vindicius 217 female holotype (B. M. TYPE HYM. 9.316), head, mesosoma, metasoma, dorsolateral view 218 female (USNMENT 00896037), head, mesosoma, metasoma, dorsal view. Scale bars in millimeters.

Figures 219 - 221. Trissolcus vindicius 219 female (USNMENT 00896037), head, mesosoma, metasoma, lateral view 220 female (USNMENT 00896024), head and mesosoma, ventrolateral view 221 female holotype (B. M. TYPE HYM. 9.316), head, anterolateral view. Scale bars in millimeters.