Trissolcus larides (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 : 33

Trissolcus larides (Nixon) Figures 94 , 95-97

Microphanurus larides Nixon, 1943: 138, 141 (original description, keyed); Risbec, 1950: 569 (keyed).

Trissolcus larides (Nixon): Masner, 1965: 126 (type information, generic transfer); Johnson, 1992: 630 (cataloged, type information).

Description.

Female body length: 1.00-1.19 mm (n=4). Body color: head and mesosoma black, metasoma black to reddish brown.

Head. Color of radicle: yellow. Length of radicle: less than width of clypeus. Color of A1-A6 in female: yellow. Color of A7-A11 in female: pale brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: absent; present as short grooves. Number of clypeal setae: 6. 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: medially delimited by ridge or carina at midpoint of eye, poorly defined or absent near intersection with malar sulcus. Macrosculpture of frons between antennal scrobe and anterior ocellus: absent; weakly transversely strigose. Preocellar pit: absent. Setation of lateral frons: sparse. Punctation of lateral frons: absent. Sculpture directly ventral to preocellar pit: microsculptured. Macrosculpture of lateral frons: weakly horizontally striate, striae of antennal scrobe extending to lateral frons. OOL: lateral ocellus and eye without continuous scleritic separation. Hyperoccipital carina: absent. Macrosculpture of posterior vertex: absent. Microsculpture on posterior vertex along occipital carina: present. Anterior margin of occipital carina: finely crenulate to smooth.

Mesosoma. Epomial carina: absent. Macrosculpture of lateral pronotum directly anterior to netrion: striate, striae formed by elongation of cells of netrion sulcus; absent. Netrion sulcus: incomplete. Pronotal suprahumeral sulcus in posterior half of pronotum: undifferentiated from sculpture of dorsal pronotum. Number of episternal foveae: 0. Subacropleural sulcus: present. Speculum: smooth. Mesopleural pit: simple. Mesopleural carina: complete; absent; 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: absent. Microsculpture of anteroventral mesopleuron: present throughout. Macrosculpture of anteroventral mesopleuron: absent. Postacetabular sulcus: formed by small punctures. Setation of posteroventral metapleuron: present. Sculpture of dorsal metapleural area: absent. Posterodorsal metapleural sulcus: poorly defined to absent. Paracoxal sulcus in ventral half of metapleuron: indistinguishable from sculpture to absent; absent. Anteroventral extension of metapleuron: not extending to base of mesocoxa. Metapleural epicoxal sulcus: present as coarse rugae. Mesoscutal humeral sulcus: present as a simple furrow. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: longitudinally striate posteriorly, otherwise absent. Pattern of mesoscutal microsculpture: uniform throughout. Mesoscutal suprahumeral sulcus: absent. Parapsidal line: absent. Notaulus: absent. Median protuberance on anterior margin of mesoscutellum: absent. Shape of dorsal margin of anterior lobe of axillar crescent: acute. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Area bounded by axillar crescent: smooth. Macrosculpture of mesoscutellum: absent. Microsculpture on mesoscutellum: present throughout. Median mesoscutellar carina: absent. Setation of posterior scutellar sulcus: absent. Form of metascutellum: furrow with broad interspaces between crenulae. Metanotal trough: foveate, foveae occupying more than half of metanotal height. Metapostnotum: undifferentiated from remainder of propodeum. Length of postmarginal vein: about 1.5 times as long as stigmal vein. Color of legs: coxae brown, legs elsewhere yellow. Anteromedial portion of metasomal depression: weakly striate.

Metasoma. Longitudinal striae on T1 posterior to basal costae: absent. Number of sublateral setae (on one side): 0. Setation of laterotergite 1: absent. Longitudinal striation of T2: present in anteromedial portion of the tergite. Setation of T2: absent. Setation of laterotergite 2: present. Striation of S2: absent. Setation of S2: present only in medial third.

Diagnosis.

Trissolcus larides is unique among species with a setose metapleuron in that the episternal foveae are entirely absent. It is most similar to T. levicaudus with which it shares an antero-posteriorly compact habitus, the absence of notauli, a smooth speculum, and T1 smooth posterior to the basal costae. The two may be separated by a number of characters: the anteromedial portion of T2 is striate in T. larides and smooth in T. levicaudus ; the mesoscutal humeral and mesoscutal suprahumeral sulci are smooth furrows in T. larides and comprised of cells in T. levicaudus ; T. levicaudus has a single episternal fovea and T. larides has none; the prespecular sulcus extends ventrally to the mesopleural pit in T. levicaudus but not in T. larides ; the cells along the anterior margin of the metascutellum are deep punctures in T. levicaudus and in T. larides this sulcus is a furrow with broad interspaces between crenulae; the wing membrane at the junction of the marginal, postmarginal, and stigmal veins is pigmented in T. larides and hyaline in T. levicaudus .

Link to distribution map.

http://hol.osu.edu/map-large.html?id=354381

Material examined.

Holotype, female, Microphanurus larides : SENEGAL: Diourbel Rég., Bambey , 31.V.1939, reared from egg, J. Risbec, B.M. TYPE HYM. 9.310 (deposited in BMNH) . Other material: UNITED ARAB EMIRATES: 4 females, USNMENT00896166, 00896174, 00896184, 00896216 (CNCI) .

Figures

Figures 94. Trissolcus larides female (USNMENT 00896166), head, mesosoma, metasoma, lateral view. Scale bars in millimeters.

Figures 95 - 97. Trissolcus larides 95 female (USNMENT 00896174), head, mesosoma, metasoma, dorsal view 96 female (USNMENT 00896174), mesosoma, posterolateral view 97 female (USNMENT 00896216), head, anterior view. Scale bars in millimeters