Trissolcus kozlovi Rjachovskij, 1893

Talamas, Elijah J., Buffington, Matthew L. & Hoelmer, Kim, 2017, Revision of Palearctic Trissolcus Ashmead (Hymenoptera, Scelionidae), Journal of Hymenoptera Research 56, pp. 3-185 : 32

Trissolcus kozlovi Rjachovskij Figures 90 , 91-93

Trissolcus amplus Kononova syn. n.; http://bioguid.osu.edu/xbiod_concepts/354847

Trissolcus Kozlovi Rjachovskij, 1975: 4 (original description).

Trissolcus kozlovi Rjachovskij: Kozlov & Lê, 1977: 504 (keyed); Kozlov, 1978: 629 (description); Kozlov & Kononova, 1983: 85 (description); Johnson, 1992: 630 (cataloged, type information); Kononova, 2014: 1421 (keyed); Kononova, 2015: 258 (keyed).

Trissolcus amplus Kononova syn. n., 2014: 747 (original description, diagnosis).

Description.

Female body length: 1.08-1.33 mm (n=7). Body color: head, mesosoma, and metasoma black.

Head. Color of radicle: yellow; brown. Length of radicle: less than width of clypeus. Color of A1-A6 in female: basal A1 and distal A2 yellow, elsewhere 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: 4; 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: irregularly rugose, rugae effaced. Preocellar pit: present. Setation of lateral frons: sparse. Punctation of lateral frons: present along medial margin of orbital furrow. Sculpture directly ventral to preocellar pit: absent. Macrosculpture of lateral frons: absent. OOL: lateral ocellus and eye without continuous scleritic separation. Hyperoccipital carina: complete. Macrosculpture of posterior vertex: absent. Microsculpture on posterior vertex along occipital carina: present. Anterior margin of occipital carina: coarsely crenulate.

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. Posterodorsal metapleural sulcus: 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 coarse rugae. Mesoscutal humeral sulcus: indicated by a line of cells. Median mesoscutal carina: absent. Macrosculpture of mesoscutum: rugulose, with oblique symmetryl in relation to longitudinal midline. Pattern of mesoscutal microsculpture: effaced posteriorly. Mesoscutal suprahumeral sulcus: comprised of cells. Length of mesoscutal suprahumeral sulcus: about half the length of anterolateral edge of mesoscutum. Parapsidal line: absent. Notaulus: extending at least 1/3 length of mesoscutum. Median protuberance on anterior margin of mesoscutellum: absent. Protruberance on anterior margin of mesoscutellum directly posterior to notaulus: present. Shape of dorsal margin of anterior lobe of axillar crescent: flat, appearing fused with lateral margin of mesoscutum. Sculpture of anterior lobe of axillar crescent: dorsoventrally strigose. Area bounded by axillar crescent: striate; punctures visible in at least ventral half, not quite striate. Macrosculpture of mesoscutellum: absent. Microsculpture on mesoscutellum: absent. 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, femora yellow to dark brown, 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: sparsely present in posterolateral corner. Setation of laterotergite 2: present. Striation of S2: present laterally and in anterior half of median third. Setation of S2: sparsely present throughout area not covered by laterotergite.

Link to distribution map.

http://hol.osu.edu/map-large.html?id=3250

Material examined.

Holotype, female, T. Kozlovi : RUSSIA: Voronezh Reg., Ramon’, 13.VIII.1972, V. Rjachovskij, ZMAS 0147 (deposited in ZIN) . Paratypes: RUSSIA: 3 females, USNMENT00916623-00916625 ( ZIN) . Other material: MOLDOVA: 3 females, USNMENT00916620-00916622 ( ZIN) .

Diagnosis.

Trissolus kozlovi is a difficult species to treat taxonomically because it is represented by a small number of specimens that are extremely similar to T. japonicus and T. plautiae . It remains diagnosable among the specimens at hand by subtle, but seeming reliable characters: from both T. japonicus and T. plautiae it may be separated by the obliquely oriented sculpture on the posterior mesoscutum between the notauli. The sculpture on the frons above the interantennal process is also useful for separating T. kozlovi from these species: in T. kozlovi the frons has irregular lines of sculpture; in T. plautiae this part of the frons is entirely smooth and in T. japonicus it is covered with microsculpture, sometimes with weak transvere striation or a dorsoventral furrow below the median ocellus. Assessment of this character’s utility for species-level identification requires additional specimens and, if possible, corroboration with molecular data.

Comments.

In most specimens, including the holotype, there are 4 clypeal setae present. The lateral setae are about half the length of the median pair, and in some specimens the lateral setae appear to be absent. In some cases a seta is absent from one side only, in some, the lateral setae are appressed to the labrum or clypeus, probably as a preservation artifact, in others neither are evident. We suspect that these setae are broken off, but because we cannot be certain, the description for this character is coded as having both 2 and 4 setae.

Figures

Figure 90. Trissolcus kozlovi, female holotype (ZMAS 0147), head, mesosoma, metasoma, lateral view. Scale bars in millimeters.

Figures 91 - 93. Trissolcus kozlovi 91 female (USNMENT 00916624), head, mesosoma, metasoma, dorsal view 92 female holotype (ZMAS 0147), head, anterior view 93 female holotype (ZMAS 0147), head, anterolateral view. Scale bars in millimeters.