Trissolcus levicaudus Talamas, 2017

Talamas, Elijah J., Buffington, Matthew L. & Hoelmer, Kim, 2017, Revision of Palearctic Trissolcus Ashmead (Hymenoptera, Scelionidae), Journal of Hymenoptera Research 56, pp. 3-185 : 35

Trissolcus levicaudus Talamas sp. n. Figures 103 , 104-106

Description.

Female body length: 0.74-0.80 mm (n=7). 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: brown; pale brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: absent. Number of clypeal setae: 6. Microsculpture on gena directly above mandibular condyle: present. Shape of ventral gena in lateral view: narrow. Genal carina: present and extending dorsally to vicinity of lower margin eye. Malar striae: absent. 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; transversely strigose ventrally, absent dorsally. Preocellar pit: absent; present. Setation of lateral frons: sparse. Punctation of lateral frons: absent. Sculpture directly ventral to preocellar pit: microsculptured. Macrosculpture of lateral frons: 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: absent. Pronotal suprahumeral sulcus in posterior half of pronotum: undifferentiated from sculpture of dorsal pronotum. Number of episternal foveae: 1. Course of episternal foveae ventrally: distinctly separate from postacetabular sulcus. Course of episternal foveae dorsally: distinctly separate from mesopleural pit. Subacropleural sulcus: present. Speculum: smooth. Mesopleural pit: simple. Mesopleural carina: complete. 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 dorsally. Macrosculpture of anteroventral mesopleuron: absent. Postacetabular sulcus: formed by large cells. Setation of posteroventral metapleuron: present. Sculpture of dorsal metapleural area: absent. Posterodorsal metapleural sulcus: present as line of foveae. 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: indicated by a line of cells. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: rugulose. Pattern of mesoscutal microsculpture: uniform throughout. Mesoscutal suprahumeral sulcus: comprised of cells. Length of mesoscutal suprahumeral sulcus: about half the length of anterolateral edge of mesoscutum. 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; absent; present laterally, absent medially. Median mesoscutellar carina: absent. Setation of posterior scutellar sulcus: present. Form of metascutellum: single row of cells. Metanotal trough: mostly smooth, with furrow along ventral margin. Metapostnotum: invaginated near lateral edge of metascutellum. Length of postmarginal vein: about twice as long as stigmal vein. Color of legs: coxae brown, legs elsewhere yellow. Anteromedial portion of metasomal depression: smooth.

Metasoma. Longitudinal striae on T1 posterior to basal costae: absent. Number of sublateral setae (on one side): 0; 1. Setation of laterotergite 1: absent. Longitudinal striation of T2: absent. Setation of T2: present in a transverse line medially. Setation of laterotergite 2: absent; present. Striation of S2: absent. Setation of S2: present posteromedially.

Diagnosis.

Trissolcus levicaudus is closest morphologically to T. larides , with which it shares a setose posterior metapleuron, absence of notauli, a smooth speculum, and T1 without striae posterior to the cells along the anterior margin. It may be separated from T. larides by the absence of striation on T2, a metapostnotum extending to the lateral margin of the metascutellum in dorsal view, and the entirely hyaline fore wing.

Etymology.

The species epithet " levicaudus ", meaning "without knots" or “smooth” refers to the smoothness of the metasomal tergites.

Link to distribution map.

http://hol.osu.edu/map-large.html?id=354382

Material examined.

Holotype, female: THAILAND: Uthai Thani Prov., Khao Nang Rum Wildlife Research Station , 400m, V-1986, malaise trap, M. Allen, OSUC144511 (deposited in CNCI) . Paratypes: (6 females) INDIA : 3 females, OSUC144505, 144508-144509 ( CNCI). THAILAND : 1 female, OSUC144512 ( CNCI). UNITED ARAB EMIRATES : 2 females, USNMENT00896167, 00896173 ( CNCI).

Figures

Figure 103. Trissolcus levicaudus female holotype (OSUC 144511), head, mesosoma, metasoma, lateral view. Scale bars in millimeters.

Figures 104 - 106. Trissolcus levicaudus 104 female holotype (OSUC 144511), head, mesosoma, metasoma, dorsal view 105 female holotype (OSUC 144511), head and mesosoma, ventrolateral view 106 female paratype (OSUC 144508), head, anterior view. Scale bars in millimeters.