Rohrthripidae, Ulitzka, 2018

Ulitzka, Manfred R., 2022, New genera and species of Rohrthripidae (Thysanoptera: Tubulifera) from Burmese Cretaceous amber, Zootaxa 5162 (1), pp. 1-36 : 25

Key to genera and species of Rohrthripidae

R. pandemicus excluded.

1. Fore wings narrow, distally never wider than at base (cf. Figs 2 , 10 , 22 ).......................................... 2

-. Fore wings becoming progressively larger in distal half, broadly rounded at tip (cf. Figs 7 , 12 , 18 )..................... 5

2. Fore wings parallel and straight, with two complete veins, both with setae; fore wing fringe cilia arising from sockets ( Fig. 10 ).......................................................................... Paralleloalathrips bivenatus

-. Fore wings slightly bent forwards, broadened towards base; either with only one vein or additionally with a second vein ending approximately in the middle of the wing; fore wing fringe cilia embedded into the wing membrane ( Figs 2 , 22 ).......... 3

3. Fore wings with first vein only, which does not bear any distal setae; tube constricted ( Figs 1, 2 ).................................................................................................... Adstrictubothrips mirapterus

-. Fore wings with a shorter second vein, which ends with a prominent seta approximately in the middle of the wing ( Fig. 22 ); distal setae on first vein present; hind wings with posterior distal margin of wing membrane serrate ( Fig. 23 ) ( Sesquithrips ). ................................................................................................... 4

4. Mouth cone short and rounded ( Figs 19, 20 ); antennal segment IX clearly separated from VIII; robust species................................................................................................ S. markpankowskii

-. Mouth cone long and pointed ( Fig. 21 ); antennal segment IX broadly joined to VIII; gracile species.......... S. rostratus

5. Fore wings with two complete veins, both furnished with setae ( Fig. 7 ); pronotum ( Fig. 36 ) with two pairs of posteroangular setae (inner pair much shorter) and well-developed posteromarginal setae; fore coxae each with a long hair-like seta ( Gemineurothrips )............................................................................................ 6

-. Fore wings with one long wing vein only ( Figs 12, 13 ); second vein, if developed, reduced to basal half of wing, without any setae ( Figs 17, 18 ); pronotum with one pair of posteroangular setae, posteromarginal setae vestigial ( Fig. 37 ); fore coxae without long setae ( Rohrthrips )............................................................................. 7

6. Antennal segment I about twice longer than wide; median antennal segments at least 1.4 times longer than wide ( Fig. 4 ), with a slender pedicel; inner ocellar setae protruding beyond base of antennal segment III; head narrow...... G. microcephalus

-. Antennal segment I scarcely longer than wide; median antennal segments about as long as wide ( Fig. 6 ), without a distinct pedicel; inner ocellar setae protruding beyond base of antennal segment II; head broad.................... G. peculiaris

7. Fore wings with a distinct second vein near base (Figs 17,18).................................................. 8

-. Fore wings without a second vein ( Figs. 12, 13 ) but sometimes with an elongated shading near base ( Fig. 14 ) or with some scattered stains...................................................................................... 10

8. From Lebanese amber; tube no more than 2.8 times longer than basal width............................. R. libanicus

-. From Burmese amber; tube slenderer, more than 3.3 times longer than wide ( Fig. 18 )............................... 9

9. Mouth cone long, slender and pointed, protruding over base of prosternum ( Fig. 17 ); first wing vein with about 4 very small setae and with one distal seta as long as the distance between the vein and the anterior margin of the wing; small species (body length about 1.5mm).................................................................. R. rhamphorhynchus

-. Mouth cone shorter, not reaching base of prosternum; first wing vein with about 13 dispersed stout setae, several as long as the distance between the vein and the anterior margin of the wing ( Fig. 18 ); large species (body length about 1.9mm). R. setiger

10. Tube short and bulky, about 2.3–2.5 times longer than wide (cf. Fig. 16 )........................................ 11

-. Tube long and slender, about 3.2–5.9 times longer than wide ( Fig. 12 ).......................................... 13

11. Head very short, about 1.4–1.5 times wider than long; antennal length about 0.3 the body length; wing vein hardly extended to base of rounding of wing tip; about 0.8 times as long as fore wing; small species (body length about 1.3 mm) ( Fig. 13 )............................................................................................... R. breviceps

-. Head longer; first vein extended to base of rounding of wing tip; larger species (body length over 2.1 mm)............. 12

12. Head about as long as wide; wing vein pale along entire length; smaller species (body length about 1.6 mm).................................................................................................. R. patrickmuelleri

-. Head about 1.25 times wider than long; wing vein distally dark; large species (body length about 2.1 mm)....... R. maryae

13. First vein long, reaching costa at base of rounding of wing tip ( Fig. 14 ); length of antennal segment III about 50–70 microns; smaller species (body length about 1.5–1.6mm)............................................................ 14

-. First vein short, distally not reaching last fifth of fore wing ( Fig. 12 ); antennal segment III long (87–133 microns); large species (body length over 2.0mm)............................................................................. 15

14. Sense cones on antennal segments short (not longer than 10 microns).................................. R. jiewenae

-. Sense cones on antennal segments longer (longer than 15 microns)................................... R. burmiticus

15. Antennal segment III and IV distally cylindrical-elongated ( Figs 15 , 38 ); sense cones tiny, hardly distinguishable from setae; ocelli on a distinct ocellar hump; hamulate part of wing coupling system with six or seven hamuli ( Fig. 27 ); very large species (body length about 2.8 mm)................................................................. R. multihamuli

-. Antennal segment III and IV distally inverse conical (cf. Fig. 4 ); sense cones stout, easy to distinguish from setae; ocellar hump lacking; wing coupling with less hamuli; large species (body length about 2.0 mm)................................ 16

16. Wing vein short, hardly reaching last quarter of fore wing, apically split, with two terminal setae; tube very long and slender (about 5.1 times as long as wide at base) antennal segment III conspicuously long (about 100 microns).... R. schizovenatus

-. Wing vein longer, reaching almost last fifth of fore wing; not diverged into two branches; tube shorter (about 3.2 times as long as wide at base); antennal segment III shorter (less than 87 microns)................................. R. brachyvenis

Figures

FIGURES 1–4. Rohrthripidae species. Adstrictubothrips mirapterus gen. et sp. n. 1–2: (1) holotype female dorsal view, indicated: constriction at the tube; (2) right wings, indicated: duplicated cilium on fore wing margin. Gemineurothrips microcephalus gen. et sp. n. syntype female (MU-Fos-145/1) 3–4: (3) dorsal view; (4) left antenna.

FIGURES 8–11. Paralleloalathrips bivenatus gen. et sp. n. (8) holotype female, dorsal view, fore wings indicated; (9) paratype female, indicated: fungal spores; (10) holotype female, left fore wing; (11) paratype male, basal abdominal tergites, indicated: dorsolateral grooves on tergum II (met: metanotum, pt: pelta, mpII: medial plate of tergum II, lpII: lateral plate of tergum II, III: tergum III).

FIGURES 21–23. Sesquithrips rostratus gen. et sp. n. holotype female. (21) dorsal view, mouth cone outlined white; (22) left wings, indicated: distinct seta at distal end of second wing vein; (23) serrate hind margin of left hind wing.

FIGURES 5–7. Rohrthripidae species. (5) Gemineurothrips microcephalus gen. et sp. n. syntype female (MU-Fos-148/1): dorsolateral view. Gemineurothrips peculiaris gen. et sp. n. holotype 6–7: (6) dorsal view; (7) left fore wing.

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 16–18. Rohrthrips spp. (16) Rohrthrips pandemicus sp. n. holotype female aptera, dorsal view; (17) Rohrthrips rhamphorhynchus sp. n. holotype, dorsal view, indicated: second vein at base of fore wing; mouth cone outlined white; (18) Rohrthrips setiger sp. n. holotype female, right fore wing, indicated: second wing vein at base.

FIGURES 19–20. Sesquithrips markpankowskii gen. et sp. n. (19) holotype female, dorsal view, mouth cone outlined white; (20) paratype male, dorsal view, mouth cone outlined white. (Note: The wings of the male are bent upwards and, therefore, longer than visible on the photo).

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).

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).