Rohrthrips maryae, Ulitzka, 2019

Ulitzka, Manfred R., 2019, Five new species of Rohrthrips (Thysanoptera: Rohrthripidae) from Burmese amber, and the evolution of Tubulifera wings, Zootaxa 4585 (1), pp. 27-40 : 30-32

Rohrthrips maryae sp. n.

( Figs 4–5 )

Male. Body fully extended, slightly dorso-ventrally compressed; fore legs and left hind leg angled, other legs extended; left wings and right hind wing overlapping body, right fore wing slightly spread to the side.

Colour ( Fig. 5 ) brown including antennae and legs; head, pronotum and mesonotum as well as abdominal segments IX and X a shade darker; all major setae and wing fringes dark; wing veins brown, wing membrane shaded greyish-brown.

Head mainly smooth, faintly reticulate laterally; wider than long; produced in front of anterior margin of eyes, with cheeks slightly rounded behind eyes; cheeks lacking setae; one pair of long but very fine ocellar setae close to base of antennae. Eyes not prolonged ventrally. Hind ocelli conspicuously large; close to compound eyes; far apart from each other. Postocular setae broken off, their points of insertion visible far behind eyes. Antennae 9- segmented; segment I barrel-shaped; segment II basally asymmetric with a short pedicle; III–VI symmetrical and short, inverse conically shaped and tapering distally from level of sense cones, III with very slender pedicle; VII inverse cone-shaped; VIII spindle-shaped; IX style-shaped. Sensorium on segment II not visible; number of sense cones of the following segments difficult to assess (distorted) but at least one inner and one outer on III–VI. Mouth cone short and rounded. Palps not assessable. Pronotum broad, wider than long, trapezoidal; mediolateral and posteroangular setae long and pointed, anteromarginal and posteromarginal setae minute. Posterior half of mesonotum with scale-shaped sculpture; mesonotal setae lacking. Metanotum sculptured with fine longitudinal reticulations; setae not visible. Prosternum with fernal plates wider than long; basantra and mesopresternum not assessable; mesosternellum and metasternum fused; sternacosta meeting each of the mesothoracic coxae with a conspicuous process ( Fig. 4 ). Fore wings becoming progressively larger in distal half ( Fig. 5 ); anterior vein complete, reaching costa near apex, bearing one seta shortly before its distal end and one basal seta anteriorly to the vein; second vein not developed; membrane without microtrichia. Fringe cilia straight; arising from sockets; duplicated cilia present around apical margin of wing; clavus with paired setiform processes at tip. Hind wings without microtrichia; without any veins; base with recurved setae; sockets of wing fringes smaller than on fore wing. Fore legs with femora stout ( Fig. 5 ); fore tarsi with two teeth. Mid and hind legs slender. All femora with one long ventral and all tibiae with one long dorsal seta; mid and hind tibiae terminally each with three spines; mid and hind tarsi two-segmented, with hamus. Abdominal tergites covered by wings, for the most part not visible; lateral setae long, pointed; setae s3 on IV–VII longer than other lateral setae and conspicuously bent inwards. Abdominal segment I (pelta) broad basally, lateral parts not assessable; IX conical, with setae s3 long but not protruding tube; sternite IX with subgenital plate. Abdominal segment X (tube) conically extended at base; its sculpture not assessable; apparently without campaniform sensilla; with terminal crown of long anal setae.

Measurements. Male (in microns): Body, length 2173. Head, length 164; width 207. Eyes, length 80; width 44. Ocelli, diameter 30; distance between the hind ocelli 44. Ocellar setae 36. Prothorax, length 315; width 630; mediolateral setae 81; epimeral setae 126. Mesonotum, length 189; width 378. Pterothorax, largest width 519. Abdomen, length 1275; largest width 744 (segments III); segment X (tube), length 233; basal width 94. Setae s3 on tergite IX about 250. Antennae, length 409; length (largest width) of segment I 57 (32), II 63 (28), III 69 (41), IV 44 (38), V 44 (32), VI 44 (25), VII 38 (19), VIII 31 (9), IX 19 (6). Sense cones, length of inner (outer) on segment III – (19), IV 13 (19), V 22 (25), VI 19 (–), VII – (–); basal width 3–5. Fore wings, length 1331; largest width 337.

Material studied. Holotype male MU-Fos-88/1. Inclusion in Burmese amber, donated to the author by Mary Pankowski.

Syninclusions. Many tiny droplets.

Etymology. The species R. maryae is gratefully dedicated to Mary Pankowski for donating the holotype of this new species and for her valuable help with linguistic revisions to this paper.

Figures

FIGURES 1–4. Rohrthrips spp. R. breviceps sp. n. holotype male 1–2: (1) dorsal view; (2) pterothoracic sternal plates (green: mesopresternum, yellow: mesosternum, red: trochantin, violet: mesokatepisternum, blue: metasternum). (3) R. jiewenae sp. n. holotype female, dorsal view, indicated: fungal spores. (4) R. maryae sp. n. holotype male, pterothoracic sternal plates.

FIGURES 5–8. Rohrthrips spp. (5) R. maryae sp. n. holotype male, dorsal view. R. patrickmuelleri sp. n. holotype female 6– 8: (6) dorsal view; (7) surface pattern of wings (phase contrast), indicated red: longitudinally orientated surface pattern, indicated black: submarginal ridge; (8) basal part of wings (phase contrast), indicated white: wing vein, indicated red: longitudinally orientated surface pattern, indicated black: microtrichia.