Trissolcus yamagishii Ryu, 1984

Talamas, Elijah J., Buffington, Matthew L. & Hoelmer, Kim, 2017, Revision of Palearctic Trissolcus Ashmead (Hymenoptera, Scelionidae), Journal of Hymenoptera Research 56, pp. 3-185 : 77-80

Trissolcus yamagishii Ryu Figures 222-224 , 225-226

Trissolcus artatus Kozlov & Lê, syn. n.; http://bioguid.osu.edu/xbiod_concepts/179840; Morphbank78

Trissolcus yamagishii Ryu, 1984: 37, 53 (original description, keyed).

Trissolcus artatus Kozlov & Lê, syn. n., 2000: 312, 313, 361 (original description, keyed).

Description.

Female body length: 1.33-1.76 mm (n=19). Male body length: 1.29-1.58 mm (n=2). Body color: head, mesosoma, and metasoma black.

Head. Color of radicle: black. Length of radicle: equal to or greater than width of clypeus. Color of A1-A6 in female: yellow, becoming brown distally. Color of A7-A11 in female: brown. Number of basiconic sensilla on A6: 0. Number of basiconic sensilla on A7: 2. Facial striae: present as short grooves. Number of clypeal setae: 6. Microsculpture on gena directly above mandibular condyle: present. Shape of ventral gena in lateral view: moderately bulging. Genal carina: present and extending dorsally to vicinity of lower margin eye. Malar striae: absent. Sculpture of malar sulcus: smooth; 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: small number of dorsoventral striae directly ventral to anterior ocellus. Preocellar pit: present. Setation of lateral frons: moderately dense. Punctation of lateral frons: absent. Macrosculpture of lateral frons: rugose. OOL: separated by less than one ocellar diameter. 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: present. Macrosculpture of lateral pronotum directly anterior to netrion: striate, striae formed by elongation of cells of netrion sulcus. Netrion sulcus: incomplete. Pronotal suprahumeral sulcus in posterior half of pronotum: undifferentiated from sculpture of dorsal pronotum. Number of episternal foveae: 3; 2. Course of episternal foveae ventrally: distinctly separate from 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: complete. Sculpture of femoral depression: faintly rugulose. Patch of striae at posteroventral end of femoral depression: present, striae perpendicular to long axis of femoral depression. Setal patch at posteroventral end of femoral depression: present. Microsculpture of anteroventral mesopleuron: present throughout. Macrosculpture of anteroventral mesopleuron: absent. Postacetabular sulcus: formed by open crenulae. Mesopleural epicoxal sulcus: formed by open crenulae. Mesofurcal pit: absent. Setation of posteroventral metapleuron: absent. Sculpture of dorsal metapleural area: mostly smooth with faint rugulae radiating from metapleural pit. Posterodorsal metapleural sulcus: present as line of foveae. Paracoxal sulcus in ventral half of metapleuron: indistinguishable from sculpture to absent. Anteroventral extension of metapleuron: extending to base of mesocoxa. Metapleural epicoxal sulcus: absent or indistinguishable from sculpture. Mesoscutal humeral sulcus: present as a simple furrow. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: reticulate anteriorly, becoming longitudinally strigose posteriorly. 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. Notaulus: absent. Median protuberance on anterior margin of mesoscutellum: absent. Shape of dorsal margin of anterior lobe of axillar crescent: round. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Posterodorsal margin of axillular carina: pointed. Area bounded by axillar crescent: smooth. Macrosculpture of mesoscutellum: longitudinally strigose medially, rugulose laterally. Microsculpture on mesoscutellum: present throughout. Median mesoscutellar carina: absent; present. Setation of posterior scutellar sulcus: present. Form of metascutellum: coarsely rugose. Metanotal trough: smooth in dorsal half, with line of foveae ventrally. Metapostnotum: invaginated near lateral edge of metascutellum. Length of postmarginal vein: about twice as long as stigmal vein. Color of legs: coxae black; trochanters and femora brown, with femora becoming much lighter distally, tibiae and tarsi pale brown to 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): 2; 1; 3. Setation of laterotergite 1: absent. Longitudinal striation of T2: present in anterior two-thirds of tergite. Setation of T2: present in a transverse line and along lateral margin. Setation of laterotergite 2: present. Posteriorly directed setae on medial S1: present. Striation of S2: absent. Setation of S2: present throughout area not covered by laterotergite.

Diagnosis.

Trissolcus yamagishi can be distinguished from other Palearctic Trissolcus in the basalis group by the complete mesopleural carina and the characteristic sculpture of the frons in which a dorsoventral carina below the anterior ocellus is flanked by areas of effaced microsculpture (Figures 222 , 224 ). The characters used to separate T. yamagishii and T. comperei (= T. itoi ) in the key to species by Ryu (1984) are not reliable. Variation occurs in the degree of rugosity in the mesoscutellum in both T. yamagishii and T. comperei , and the antennae and legs are subject to color variability. Specifically, the legs in T. yamagishii have two color forms, one in which the legs are entirely yellow beyond the coxae and one in which the trochanters and basal femora are brown, becoming lighter distally. We examined a single male of this species which had bright yellow legs beyond the coxae.

Link to distribution map.

http://hol.osu.edu/map-large.html?id=3334

Material examined.

Holotype, female, T. yamagishii : SOUTH KOREA: Mt. Sudosan , 9.VII-12.VII.1971, K. Yamagishi, Type No. 2221 Kyushu Univ. (deposited in KUEC) . Holotype, female, T. artatus : VIETNAM: Thai Nguyen Prov., Thái Nguyên, 14.IV.1986, A. Sharkov, IEBR 0038 (deposited in IEBR) . Other material: (19 females, 2 males) INDIA: 1 female, 1 male , USNMENT00916366-00916367 (BMNH). LAOS: 1 female , USNMENT00903336 (BPBM). SOUTH KOREA: 1 female , USNMENT00896017 (CNCI). UNITED ARAB EMIRATES: 16 females, 1 male , USNMENT00896005-00896010, 00896160, 00896168-00896172, 00896188-00896189, 00896215, 00896295, 00896331 (CNCI).

Comments.

We here significantly expand the known distribution of this species to include India, Laos, Vietnam and the United Arab Emirates.

Figures

Figures 222 - 224. T. yamagishii 222 female holotype (Type No. 2221 Kyushu Univ.), head, anterior view 223 female holotype (Type No. 2221 Kyushu Univ.), head and mesosoma, anteroventral view 224 female (USNMENT 00896189), head and antennae, anterior view. Scale bars in millimeters.

Figures 225 - 226. T. yamagishii 225 female holotype (Type No. 2221 Kyushu Univ.), head, mesosoma, metasoma, lateral view 226 female (USNMENT 00903336), head, mesosoma, metasoma, dorsal view. Scale bars in millimeters.