Trassedia pilosus Masner and Mikó, 2018

Mikó, István, Trietsch, Carolyn, Kamp, Thomas van de, Masner, Lubomír, Ulmer, Jonah M., Yoder, Matthew Jon, Zuber, Marcus, Sandall, Emily L., Baumbach, Tilo & Deans, Andrew R., 2018, Revision of Trassedia (Hymenoptera: Ceraphronidae), an Evolutionary Relict With an Unusual Distribution, Insect Systematics and Diversity (AIFB) 2 (6), No. 4, pp. 1-29 : 23

Trassedia pilosus Masner and Mikó sp. nov.

(Zoobank LSID: urn:lsid:zoobank.org:act:ACE29BF1-01F5-42D1-81B7-8BF9ACA1005C )

Diagnosis

Trassedia pilosus shares the presence of elongate interommatidial setae with T. nigrorufus (setae 2× as long as the diameter of the facets) and can be separated from that species by the preoccipital sulcus (wider anteriorly than posteriorly in T. pilosus (pof: Fig. 14A ) and not in T. nigrorufus (pof: Fig. 6C ) and the body coloration (head and ventral mesosoma concolorous with the dorsal mesosoma in T. pilosus ; head and ventral mesosoma dark brown, dorsal mesosoma orange in T. nigrorufus ).

Description

Body length: 1.25–1.35 mm. Color hue pattern male: cranium, mesosoma, metasoma ochre, legs except mesocoxa and metacoxa, antenna yellow, mesocoxae and metacoxae white. Color intensity pattern male: scape lighter than flagellum, cranium and mesosoma darker than metasoma. Structure of scutes on head and mesosoma: Scute surface on head and mesosoma flat, scutes indistinct. Head: HW:HH = 1.1. HW/IOS Male: 1.8. Maximum eye diameter versus minimum eye diameter: 1.2. Interommatidial seta length: Interommatidial seta more than two times as long as facet diameter. Occipital carina medially: continuous. Seta length on dorsal region of cranium versus diameter of median ocellus: longer. Setal pit on vertex size: smaller than diameter of scutes. Scutes on vertex count: absent. Preoccipital furrow anterior extension: adjacent anteriorly to the posterior margin of the median ocellus. Preoccipital furrow anterior region versus posterior region sculpture: posterior region crenulate, anterior region smooth or finely reticulate. Preoccipital furrow anterior region width versus posterior region width: wider anteriorly than posteriorly. Male OOL: POL: LOL: 0.8–0.9:0.5–0.8:1.0. Preocellar pit count: absent. Carina delimiting antennal scrobe count: absent. Transverse striation on upper face count: absent. Anterior ocellar fovea shape: fovea extended ventrally into facial sulcus, reaching dorsal margin of antennal scrobe. Supraclypeal depression count: present. Ocular impression sculpture: scalloped (foveae composing ocellar impression adjacent, sometimes not separated from each other). Antenna: Length of setae on male flagellomere versus male flagellomere width: setae as long as width of flagellomeres. Male scape length versus pedicel length: 2.8. Male F1 length versus pedicel length: 1.5. Male scape length versus combined length of F1+F2: shorter. Male F6 length versus combined length of F7+F8: Shorter than length of flagellomere 7 + 8. Number of flagellomeres with male-specific ventral sensilla: F6-9. Mesosoma: Mesosoma shape: not compressed laterally, as wide as high or wider than high. Pronope count: present. Anterior slope of mesonotum shape: Anterior slope of mesonotum at obtuse angle to dorsal surface of mesonotum in lateral view. Antero-admedian line count: present. Notaulus count: present. Notaulus anterior origin versus anterolateral angle of mesoscutum (ball-and-socket articulation between pronotum and mesoscutum): notaulus arises at anterolateral angle of the mesoscutum. Posterior end of notaulus versus posterior end of antero-admedian line location: antero-admedian line extends more posteriorly than notaulus. Scutes on posterior region of mesoscutum and dorsal region of mesoscutellum count: present. Epicnemial carina count: complete. Sternaulus count: absent. Anterior metapleural carina count: absent. Carina limiting posteriorly antecosta count: present. Lateral propodeal carina count: present. Wings: Stigmal vein length versus pterostigma marginal length: stigmal vein longer than the pterostigma marginal length. Metasoma: Waterston’s evaporatorium shape medially male: not paired, single median evaporatorium present.

Male genitalia: Anterior margin shape of male S9: straight. Male S9 distal setal line/setal patch count: distal setae composing setiferous patch(es). Distomedian, hairless area (interrupting transverse row of setae or patch) on male S9 count: absent (distal setiferous patch/line continuous medially). Distal margin of male S9 shape: concave. Proximolateral corner of male S9 shape: blunt. Proximolateral projection of the cupula shape: blunt. Gonostyle/volsella complex length: longer than wide. Gonostyle/volsella complex proximodorsal margin shape: straight or slightly concave. Distal sensilla on gonossiculus versus proximal margin of gonossiculus location: closer to distal margin than to proximal margin of gonossiculus. Distal margin of harpe in lateral view: shape: acute. Lateral setae of harpe count: present. Lateral margin of harpe shape: widest point of harpe is at its articulation site with gonostyle-volsella complex.

Etymology

The species epithet refers to the long interommatidial setae of the new species.

Figures

Fig. 14. Brightfield images of Trassedia species. (A) Head of Trassedia pilosus, anterior view (PSUC_FEM 9720). (B) Head of Trassedia guianensis Mikó and Masner sp. nov., anterior view (PSUC_FEM 35025).(C) Head and mesosoma of Trassedia pilosus, lateral view (PSUC_FEM 9720).(D) Lateral habitus of Trassedia nigrorufus Mikó and Masner (PSUC_FEM 53672). (E) Antenna of Trassedia guianensis Mikó and Masner sp. nov.(PSUC_FEM 35025) (ios = interommatidial setae, pof = preoccipital furrow).

Fig. 6. Brightfield images of Trassedia species. (A) Head and mesosoma of Trassedia luapi Cancemi 1996, lateral view (CASENT 2040888). (B) Head and mesosoma of Trassedia brasiliensis Masner and Mikó sp. nov., dorsal view (OSUC 372988). (C) Head and mesosoma of Trassedia nigrorufus Mikó and Masner sp. nov., dorsal view (NCSU 53672) (ios = interorbital seta, pof = preooccipital furrow, ster = sternaulus).