Rohrthrips multihamuli, Ulitzka, 2022

Ulitzka, Manfred R., 2022, New genera and species of Rohrthripidae (Thysanoptera: Tubulifera) from Burmese Cretaceous amber, Zootaxa 5162 (1), pp. 1-36 : 13-14

Rohrthrips multihamuli sp. n.

( Figs 15 , 27 , 38 )

Female. Abdomen slightly contracted; head bent upwards, its left side at base slightly dented; body partially covered by a reflective layer that gives an excellent impression of the sculptured structure; tube and parts of the wings difficult to assess due to cracks and bubbles; fore wings spread, hind wings overlapping body, left fore leg folded under body.

Colour uniformly dark brown including antennae and legs; all major setae dark as well as wing veins and fringes; wings very weakly shaded greyish brown, largely translucent.

Head ( Fig. 15 ) as long as wide; recessed behind the eyes; sculptured with fine reticulations. Cheeks nearly straight, diverging backwards and tapering sharply after a lateral ridge towards base; furnished with tubercles bearing short stout setae. Ocellar setae not assessable, two points of attachment visible near base of each antenna. Postocular setae far behind compound eyes; pointed, long and stout. Eyes large, laterally occupying about half of the head length; not prolonged ventrally. Ocelli arranged on a distinct ocellar hump, with fore ocellus protruding towards front and hind ocelli close to compound eyes. Antennae nine-segmented ( Figs 15 , 38 ); segment I long, broadened at base, inverse funnel-shaped; II inversely conical, with a campaniform sensillum close to apex; III and IV basally with a long pedicle, distally cylindrical; V basally with a long pedicle, then inversely conical and ventrally with a pointed projection bearing a seta at apex; VI–VIII basally with a short pedicle, then inverse conical and slightly tapering towards apex, each with a short projection ventrally (somewhat similar to some species of extant Anactinothrips Bagnall (see Retana-Salazar 2009); IX conical, broadly attached to VIII. All antennal segments bearing many setae, particularly III and IV. Sense cones tiny, difficult to see and to distinguish from setae; their number not determinable. Mouth cone short and rounded. Maxillary stylets not assessable. Pronotum trapezoidal, wider than long; sculptured finely reticulate; with notopleural suture complete. Pronotal anteromarginal and posteromarginal setae vestigial; anteroangular setae recurved and pointed; mediolateral, posteroangular and epimeral setae distinctly long, hairlike and finely pointed. Mesonotum and metanotum sculptured reticulate; metanotum with a pair of long median setae far behind front margin of plate. Fore wings becoming progressively larger in distal half; anterior vein reaching costa at about three quarters of the wings’ length, distally expanded to a brown elongated mark, furnished with a row of 12 setae and distally with three terminal setae close to costa; second vein not developed; membrane anteriorly at base clearly with some sparse microtrichia ( Fig. 27 ), distal part of the wing membrane smooth. Fringe cilia straight; slightly enlarged at base but embedded into the wing membrane, not on sockets. Duplicated cilia present around apical margin of wing; running parallel to normal wing fringes; on sockets or at least not deeply retracted into wing membrane. Hind wings at base clearly with some sparse microtrichia ( Fig. 27 ), distal part of the wing membrane smooth and without any veins. Wing coupling system hamulo-frenate; hamulate component consisting of a row of six (right) and seven (left) hamuli at anterior margin close to base of hind wing ( Fig. 27 ). Fore legs ( Fig. 15 ) with femora enlarged; tibiae dorsally with a long hair-like seta; fore tarsi with a strong tooth and with hamus. Mid legs slender; tibiae each with a long dorsal seta and terminally with two strong spines; mid and hind tarsi twosegmented. Abdominal tergites without wing-retaining setae, but with fine long and recurved dorsal and lateral setae; sculpture of tergites reticulate (assessable only in some parts). Abdomen with tergite I (pelta) broad, shape of fore margin not assessable (covered by hind margin of metanotum); tergite II with a dorsolateral suture slanting laterally inwards; VIII with sternal gynosternites clearly visible. Segment IX conical, tergal setae s1 (broken off, preserved near tube) stouter than s2 and s3; s2 longest, but much shorter than tube. Abdominal segment X tubular, long and slender, with a terminal crown of anal setae, which are shorter than the tube.

Measurements. Female (in microns): Body, length 2800. Head, length 274; largest width 274. Eyes, length 132; width 63. Hind ocelli, diameter 25; distance between the hind ocelli 50. Postocular setae about 60 (difficult to measure). Pronotum, length 340; width 447; anteroangular setae 50, mediolateral setae 208, posteroangular setae 206 and epimeral setae 164. Pterothorax, largest width 539. Abdomen, length 1760; largest width 566 (segment III); segment X (tube), length 460; basal width 78. Setae on tergite IX, s1 186; s2 380; s3 196. Antennae, length 744; length (largest width) of segment I 68 (31), II 62 (28), III 133 (43), IV 133 (37), V 114* (28), VI 93* (22), VII 65* (20), VIII 57* (12), IX 28 (6) [all measurements taken on right antenna; segments indicated with * have been measured from segment base to tip of the distal projections]. Fore wings, length 1352; largest width 343.

Material studied. Holotype female MU-Fos-137/1 ( Figs 15 , 27 , 38 ); inclusion in Burmese amber from Hukawng Valley , Kachin State, Myanmar. The holotype was donated by Patrick Müller and is deposited in the author’s collection.

Syninclusions. A mite (attached?) dorsally to the abdomen of the thrips; remnants of an insect, a plant trichome, many air bubbles around the thrips inclusion.

Etymology. The species epithet multihamuli refers to the wing coupling system comprising a remarkable number of hamuli ( Fig. 27 ).

Figures

FIGURES 12–15. Rohrthrips spp. (12) Rohrthrips brachyvenis sp. n. holotype female, dorsal view; (13) Rohrthrips breviceps male, dorsal view (Note: the median shading makes the tube appear narrow, but the lighter edges are part of the tube, which actually is broad at base); (14) Rohrthrips jiewenae male, dorsal view; (15) Rohrthrips multihamuli sp. n. holotype female, head and pronotum, antennal segments III–IV indicated with roman numerals.

FIGURES 24–29. Thysanoptera wings. Wing coupling (f: frenulum, h: hamuli, r: retinaculum, smr: submarginal ridge, indicat- ed: microtrichia) 24–27: (24) Taeniothrips inconsequens Uzel (Terebrantia: Thripidae); (25) Elaphrothrips cf. costalimai Hood (Tubulifera: Phlaeothripidae: Idolothripinae); (26) Gemineurothrips microcephalus gen. et sp. n. (Tubulifera: Rohrthripidae); (27) Rohrthrips multihamuli sp. n. (Tubulifera: Rohrthripidae). Tubulifera fore wing duplicated cilia (green to red arrow: area with duplicated cilia) 28–29: (28) Haplothrips setiger Priesner (Phlaeothripidae); (29) Gemineurothrips microcephalus gen. et sp. n. (Rohrthripidae).

FIGURES 35–38. Line drawings of Rohrthripidae. Head, mouthparts and prothorax (md: mandibula, mx: maxillary stylets) 35–37: (35) Adstrictubothrips mirapterus gen. et sp. n. holotype female; (36) Gemineurothrips peculiaris gen. et sp. n. holotype (spa: posteroangular setae, left broken off and lying close to coxa; scx: coxal setae); (37) Rohrthrips rhamphorhynchus sp. n. holotype. (38) Rohrthrips multihamuli sp. n. holotype; left antenna, segment numbers in Roman numerals, indicated: ventral projections on segments V–VII (cs: campaniform sensillum, uncolored trichomes indicate presumptive sense cones).