Trassedia gauldi Mikó and Masner, 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 : 18-19

Trassedia gauldi Mikó and Masner sp. nov.

(Zoobank LSID: urn:lsid:zoobank.org:act:84A4E3C2-2690-41DD-83C7-B6A3627EFFA5 )

Diagnosis

Trassedia gauldi is most similar to Trassedia guianensis in the lack of elongate interommatidial setae (in both species the setae are less than 1.5× as long as the diameter of the facets) and the lack of convex scutes on the dorsal cranium and mesosoma. Female specimens differ in POL:OOL ratio (POL as long as OOL in T. gauldi and 2× as long as OOL in T. guianensis ), the completeness of the occipital carina (the carina is incomplete medially in T. guianensis ), the length of the antennomeres (F1 shorter than the pedicel in T. gauldi and longer than the pedicel in T. guianensis ) and the body coloration (head and mesosoma black and metasoma brown in T. guianensis ; head, mesosoma, and metasoma brown in T. gauldi ). Males of the two species differ in the length of setae on the flagellomeres (setae shorter than the width of the flagellomeres in T. gauldi and longer than the width of the flagellomeres in T. guianensis ), POL:OOL ratio (POL shorter than OOL in T. gauldi and as long as OOL in T. guianensis ) and the length/width ratio of the gonostyle/volsella complex (gonostyle/volsella complex wider than long in T. guianensis and longer than wide in T. gauldi ).

Description

Body length: 1.60–2.60 mm. Color hue pattern female: brown, legs, scape, pedicel, and F1–F4 yellowish, forewing brownish with a transverse discolored band at level of stigmal vein. Color intensity pattern female: head lighter than mesosoma and F5–F9, metasoma lighter than head, hind femur lighter than the rest of legs. Color hue pattern male: brown, legs yellowish, forewing brownish, with a transverse discolored band at level of stigmal vein. Structure of scutes on head and mesosoma: Scute surface on head and mesosoma flat, scutes indistinct. Head: HW:HH = 1.1–1.2. HW/IOS Female: 2.5– 2.7. HW/IOS male: 1.9. Maximum eye diameter versus minimum eye diameter: 1.1–1.3. Interommatidial seta length: Interommatidial seta length less than facet diameter. Occipital carina medially: continuous medially. Seta length on dorsal region of cranium versus diameter of median ocellus: longer. Scutes on vertex count: absent. Preoccipital furrow anterior extension: extending anteriorly of the anatomical line connecting the two lateral ocelli and not adjacent to anterior 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. Female OOL: POL: LOL: 0.4–0.6:0.5–0.6:1.0. Male OOL: POL: LOL: 1.4:1.0:1.0. Preocellar pit count: present. Carina delimiting antennal scrobe count: present. 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 shorter than width of flagellomeres. Male scape length versus pedicel length: 1.7. Male F1 length versus pedicel length: 1.2. 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. Female scape length versus pedicel length: 2.0–2.6. Female F1 length versus pedicel length: 0.8–1.0. Female ninth flagellomere length: F9 less than F7+F8. Mesosoma: Mesosoma shape: compressed laterally, distinctly higher than wide. 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: anteroadmedian line extends more posteriorly than notaulus. Scutes on posterior region of mesoscutum and dorsal region of mesoscutellum count: absent. Epicnemial carina count: complete. Sternaulus count: present. Sternaulus sculpture: smooth. 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: paired, left and right evaporatoria are not continuous medially. Male genitalia: Anterior margin shape of male S9: convex. Male S9 distal setal line/setal patch count: distal setae composing transverse setiferous line(s). Distal margin of male S9 shape: concave. Proximolateral corner of male S9 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. Dorsomedial cupulo-gonostipal muscles orientation: parallel. Ventral gonostipo-penisvalval muscles site of origin—proximal extension: extends distally on parossiculus.

Etymology

The species epithet refers to Ian David Gauld, the collector of the holotype.