Gahniacarus tuberculatus, Beard, Jennifer J. & Ochoa, Ronald, 2011

Beard, Jennifer J. & Ochoa, Ronald, 2011, New flat mite genera (Acari: Trombidiformes: Tenuipalpidae) associated with Australian sedges (Cyperaceae), Zootaxa 2941, pp. 1-37: 4-14

publication ID

http://doi.org/ 10.5281/zenodo.204686

DOI

http://doi.org/10.5281/zenodo.5612524

persistent identifier

http://treatment.plazi.org/id/0A68182D-FF80-F86A-FF39-FA13E8ACFCCB

treatment provided by

Plazi

scientific name

Gahniacarus tuberculatus
status

sp. nov.

Gahniacarus tuberculatus   sp. nov. Beard & Ochoa

( Figs 1 View FIGURE 1 a, 2–8)

Types. Holotype. Ƥ. Australia, Queensland, Base of Mt Hedley, Home Rule, Far North Queensland, 15 ° 44 ’ 56 ” S 145 ° 17 ’ 17 ” E, 21.vi. 2005, ex. rough saw sedge Gahnia aspera (R.Br.) Spreng.   sensu lato ( Cyperaceae   ) in margin of notophyll vineforest ( BRI voucher PIF 31002 View Materials ), J.J. Beard (QM, UQIC # 89123). Paratypes. 22 Ƥ, 8 3, 5 deutonymphs, 3 protonymphs, larva, all same data as Holotype (QM; UQIC # 16 specimens, 14 slides: Ƥ 89108 View Materials – 128 (Ƥ with long sc 1 89119, 89128); Ƥ, 3, DN, PN, larva 89140; Ƥ+DN 89141; 3 89129 – 34; 3 +DN 89142; DN 89135 – 36; PN 89137 – 38; L 89139 View Materials ).

Diagnosis. Adult female. ( Figs 1 View FIGURE 1 a, 2 – 4) As per genus, in addition to: setae sc 1 similar in length to other dorsal setae, inserted on large rounded tubercles; setal pairs c 1 –c 1 and d 1 –d 1 each inserted on single tubercle; f 2 and f 3 tubercles contiguous; large tubercles (not bearing setae) present between sc 1 –c 1, laterad c 1, posterad c 1, posterad d 1. Dorsal opisthosomal setae e 3, f 2, f 3 present.

Immatures. ( Figs 6 – 8 View FIGURE 6 View FIGURE 7 View FIGURE 8 ). Larva with posterior opisthosomal setae e 3, f 3, h 1 minute, setae f 2 similar to other dorsal setae. Protonymph with posterior opisthosomal setae f 3, h 1 minute and setae f 2, e 3 similar to other dorsal setae. Deutonymph with posterior opisthosomal setae h 1 minute and setae f 2, f 3, e 3 similar to other dorsal setae (f 3 obviously shorter than f 2, e 3). Opisthosomal setae f 3 migrate anteriorly with each nymphal moult, and are inserted anterior to f 2 in the adult ( Figs 2 View FIGURE 2 , 6 View FIGURE 6 , 7 View FIGURE 7 ). Differences in how an individual mite is mounted and the direction in which setae are flattened can alter the apparent insertion point of setae f 3 ( Fig. 6 View FIGURE 6 ). The tubercles on which setae f 2, f 3 are inserted are contiguous.

Remarks. Setae f 2 and f 3 are inserted on contiguous tubercles on adult Gahniacarus tuberculatus   , whereas setae f 2 and f 3 are inserted on well separated tubercles on G. gersonus   ; prodorsal setae sc 1 are similar in size to other dorsal setae in G. tuberculatus   , whereas sc 1 are elongate and tapered in G. gersonus   .

Adult female. (15 measured).

Dorsum. ( Figs 1 View FIGURE 1 a, 2) Body measurements: v 2 –h 1 210 – 237 [235] (v 2 – tip of protuberance 217 – 246 [245]), sc 2 – sc 2 74 – 80 [77], c 3 –c 3 87 – 92 [89], f 3 –f 3 45 – 59 [57]. All dorsal setae, except h 1 –h 2, inserted on large tubercles: setae sc 1 inserted on a pair of large rounded tubercles; setal pairs c 1 –c 1 and d 1 –d 1 each inserted on single tubercle; tubercles f 2 –f 3 contiguous; additional non-seta bearing tubercles present posterad sc 1, laterad c 1, mesad c 3 and posterad d 1. Setae h 1 –h 2 inserted beneath a tubercle-like posterior projection. Dorsal cuticle mostly smooth, with some minor transverse grooves and plicae posterior to setae c 1 and some oblique plicae posterior to setae d 1. Most dorsal setae thick, barbed, of subequal length; setae h 1 minute; h 2 elongate, barbed with minute distal club; all other dorsal setae thick, heavily barbed; barbs on prodorsal setae longer than those on opisthosoma: v 2 37 – 41 [40 – 41], sc 1 57 – 91 [67 – 80] (two specimens with elongate sc 1, 115 – 126 (89119, 89128 )), sc 2 33 – 43 [39 – 42], c 1 52 – 66 [59 – 60], c 3 34 – 40 [35 – 40], d 1 57 – 66 [61], d 3 40 – 46 [45], e 3 46 – 53 [47 – 48], f 2 44 – 55 [49 – 54], f 3 41 – 50 [49], h 1 2 – 4 [3 – 4], h 2 126 – 148 [141].

Gnathosoma   . ( Fig. 2 View FIGURE 2 ) Gnathosoma   extends to genu I. Dorsal cuticle with longitudinal plicae laterally; ventral cuticle anterior to setae 1 b finely papillate, longitudinal plicae between 1 b– 1 b and 1 b– 1 a. Ventral setae m absent. Palps three segmented; setal formula: 0, 2, 0(2); tibia with two setae (d 11 – 12; v 10 – 11); tarsus with two eupathidia (6 – 7; 5 – 6) [7; 5]. Cheliceral stylets 115 – 127.

Venter. ( Fig. 3 View FIGURE 3 ) Cuticle of ventral gnathosoma   finely papillate; remaining cuticle completely plicate, covered with fine, mostly transverse plicae; transverse plicae between setae 1 a–g 1; plicae longitudinal in coxal fields III – IV and laterad genital flap; plicae oblique on genital flap. Setae g 1 inserted anterior to g 2 on genital flap. All setae fine, smooth; setae 1 a, 1 b, 4 a 1, 4a2 elongate, fine (difficult to consistently determine full length). Setal measurements: 1a 69 – 119 [69], 1 b 54 – 82 [67 – 82], 2 b 22 – 32 [30 – 32], 2 c 20 – 28 [24 – 25], 3a 30 – 37 [32 – 36], 3 b 19 – 32 [20], 4 a 1 53 – 105 [76], 4 a 2 64 – 99 [99], 4 b 19 – 26 [21], ag 19 – 25 [19], g 1 23 – 32 [32], g 2 21 – 31 [27 – 30], ps 1 15 – 19 [16 – 18], ps 2 15 – 18 [16].

Spermathecal apparatus. ( Fig. 3 View FIGURE 3 ) Cylindrical vesicle, curled distally (27 – 32) [28].

Legs. ( Fig. 4 View FIGURE 4 ) Setal formulae for legs I – IV: 1 - 1-3 - 0-5 - 7 (1), 2 - 1-3 - 0-5 - 7 (1), 1 - 1-2 - 0-3 - 3, 1 - 1-2 - 0-3 - 3 respectively. Tarsi I and II each with one antiaxial solenidion ω ” (5 – 6, 4 – 5 respectively) and two distal eupathidia p ζ ’- p ζ ” (7 – 8, 7 – 8; 6 – 7, 7 respectively); ta I – IV with u’-u” asymmetrically barbed. Femur I with long, barbed dorsal seta (31 – 40) [32 – 37].

Colour. This species is yellow with small black spots visible internally (presumed to be food in the gut).

Adult male. (8 measured).

Dorsum. ( Fig. 5 View FIGURE 5 ) Body measurements: v 2 –h 1 181 – 200, sc 2 –sc 2 68 – 72, c 3 –c 3 70 – 75, f 3 –f 3 45 – 46. Dorsal cuticle mostly smooth; band of weak transverse plicae anterior to setae c 1. Setae sc 1, c 3, d 3, e 3, f 2 inserted on large rounded tubercles; setae v 2, sc 2, c 1, d 1, f 3 inserted on smaller tubercles (tubercles f 2, f 3 contiguous); setae h 1–2 inserted under posterior tubercle-like protuberance. Setae h 1 short; h 2 elongate with minute distal club; all other dorsal setae thick, heavily barbed. Setal measurements: v 2 29 – 32, sc 1 27 – 30, sc 2 30 – 39, c 1 24 – 28, c 3 29 – 32, d 1 20 – 26, d 3 30 – 34, e 3 36 – 40, f 2 35 – 39, f 3 33 – 36, h 1 5 – 7, h 2 114 – 148.

Gnathosoma   . ( Fig. 5 View FIGURE 5 ) Gnathosoma   extends just past genu I. Dorsal cuticle with longitudinal plicae laterally; ventral cuticle with fine longitudinal plicae anterior to setae 1 b. Ventral setae m absent. Palps three segmented; setal formula: 0, 2, 0(2); tibia with two setae (d 10 – 11, v 9); tarsus with two eupathidia (6 – 7; 4 – 6). Cheliceral stylets 89 – 92.

Venter. Cuticle completely plicate, covered with fine, mostly transverse plicae; plicae longitudinal between gnathosoma   – 1 a, transverse between 1 a– 4 a 2; band of strong plicae and folds between coxae IV; plicae longitudinal in coxal fields III – IV; plicae oblique posterior 4 a 1–2, oblique to transverse ag–g 1 (plicae longitudinal/oblique laterad anus, arching anteriorly to become transverse anterior g 1–2). Setae ps 1 modified to short thick spurs. All setae fine; setae 1 a, 1 b, 4 a 1, 4a2 elongate (difficult to consistently determine full length). Setal measurements: 1a 77 – 117, 1 b 44 – 76, 2 b 22 – 26, 2 c 19 – 24, 3 a 28 – 31, 3 b 17 – 20, 4 a 1 63 – 78, 4 a 2 42 – 72, 4 b 15 – 20, ag 14 – 17, g 1 13 – 19, g 2 14 – 15, ps 1 6 – 7, ps 2 11 – 15.

Aedeagus. ( Fig. 5 View FIGURE 5 ) Sclerotised elongate, narrow arrow-head shaped aedeagus (28 – 33), with long, narrow membranous tube (up to 85), indistinguishable distally.

Legs. ( Fig. 5 View FIGURE 5 ) Setal formulae same as adult female except ω ’ present on ta I – IV: 1 - 1-3 - 0-5 - 8 (2), 2 - 1-3 - 0-5 - 8 (2), 1 - 1-2 - 0-3 - 4 (1), 1 - 1-2 - 0-3 - 4 (1) respectively. Tarsi I and II each with two solenidion (ta I paraxial ω ’ 8 – 9, antiaxial ω ” 7 – 8; ta II paraxial ω ’ 8, antiaxial ω ” 6 – 7) and two distal eupathidia p ζ ’-p ζ ” (7 – 8, 8 – 9; 8, 6 – 7 respectively); tarsi III and IV each with one paraxial solenidion ω ’ (8, 8 – 9 respectively); ta I – IV u’-u” asymmetrically barbed. Femur I with long, barbed dorsal seta (27 – 32).

Deutonymph. (5 measured).

Dorsum. ( Fig. 6 View FIGURE 6 ) Body measurements: v 2 –h 1 170 – 228, sc 2 –sc 2 64 – 73, c 3 –c 3 70 – 82, f 3 –f 3 31 – 43. Cuticle mostly smooth with some transverse plicae mesally sc 2 –d 1. Setae sc 1, c 1, c 3, d 1, d 3, e 3, f 2 inserted on rounded tubercles (tubercles f 2, f 3 contiguous); additional tubercles between setae sc 1, anterior c 3, on posterior margin of opisthosoma. Setae h 1–2 inserted under posterior tubercle-like protuberance. Setae f 3 short; h 1 minute; setae h 2 elongate, barbed, with minute club; all other setae thick, heavily barbed. Setal measurements: v 2 30 – 35, sc 1 31 – 47, sc 2 24 – 31, c 1 24 – 34, c 3 28 – 30, d 1 23 – 35, d 3 27 – 32, e 3 29 – 36, f 2 27 – 32, f 3 13 – 18 (one specimen 6), h 1 1 – 2, h 2 112 – 126.

Gnathosoma   . Gnathosoma   extends to genu I. Ventral cuticle anterior to setae 1 b finely papillate; cuticle with longitudinal plicae between setae 1 b– 1 b and 1 b– 1 a. Ventral setae m absent. Palp with three segments; setal formula: 0, 2, 0(2); tibia with two setae (d 10, v 8); tarsus with two eupathidia (6, 5). Cheliceral stylets 97 – 103.

Venter. Cuticle completely plicate, covered mostly with transverse plicae; plicae longitudinal from gnathosoma   to setae 1 a; plicae transverse between 1 a–g 1; plicae oblique laterad ps 1–2. All ventral setae fine; setae 1 a, 1 b, 4 a 1, 4a2 elongate (difficult to determine full length). Setal measurements: 1a 63 – 104, 1 b 37 – 56, 2 b 15 – 20, 2 c 16 – 20, 3 a 13 – 23, 3 b 13 – 20, 4 a 1 38 – 53, 4 b 10 – 12, ag 7 – 11, g 1 5 – 12, ps 1 6 – 7, ps 2 6.

Legs. Setal formulae same as adult female except tr IV nude: 1 - 1-3 - 0-5 - 7 (1), 2 - 1-3 - 0-5 - 7 (1), 1 - 1-2 - 0-3 - 3, 1 - 0- 2 - 0-3 - 3 respectively. Tarsi I and II each with one antiaxial solenidion ω ” (4 – 5; 4 respectively) and two distal eupathidia p ζ ’-p ζ ” (6, 6; 6, 6 respectively); ta I – IV u’-u” asymmetrically barbed. Femur I with long, barbed dorsal seta (25 – 34).

Protonymph. (3 measured).

Dorsum. ( Fig. 7 View FIGURE 7 ) Body measurements: v 2 –h 1 161, sc 2 –sc 2 65, c 3 –c 3 66, f 3 –f 3 29. Cuticle with smooth area anteriorly on prodorsum and posteriorly between setae d 1 –h 1; transverse plicae between setae sc 2 –d 1. Setae sc 1, c 1, d 3, e 3, f 2 inserted on rounded tubercles (tubercles e 3, f 2 contiguous); additional tubercles between setae sc 1, laterad c 1, posterior margin of opisthosoma. Setae h 1, h 2 inserted under posterior tubercle-like projection. Setae f 3, h 1 minute; h 2 elongate, barbed, with minute club; all other setae thick, strongly barbed: v 2 28 – 31, sc 1 34 – 35, sc 2 31 – 32, c 1 25 – 29, c 3 26 – 27, d 1 22 – 23, d 3 27 – 28, e 3 24 – 28, f 2 20 – 21, f 3 1 – 2, h 1 1, h 2 95.

Gnathosoma   . Gnathosoma   extends beyond genu I. Ventral cuticle anterior setae 1 b finely papillate; cuticle with longitudinal plicae between setae 1 b– 1 b and 1 b– 1 a. Ventral setae m absent. Palps with three segments; setal formula: 0, 2, 0(2); tibia with two setae (d 8 – 9, v 7); tarsus with two eupathidia (6, 4). Cheliceral stylets 88.

Venter. Cuticle completely plicate, mostly covered with transverse striae; plicae longitudinal from gnathosoma   to 1 a; plicae transverse 1 a–ag; plicae oblique laterad ps 1–2. Setae fine; setae 1 a, 1 b elongate (difficult to determine full length). Setal measurements: 1a 57 – 61, 1 b 43, 2 c 7 – 10, 3 a 30, 3 b 8, ag 4, ps 1 4, ps 2 4.

Legs. Setal formulae for legs I – IV: 1 - 0-3 - 0-5 - 7 (1), 1 - 0-3 - 0-5 - 7 (1), 1 - 0-2 - 0-3 - 3, 0- 0-2 - 0-3 - 3 respectively. Tarsi I and II each with one antiaxial solenidion ω ” (4; 3 respectively) and two distal eupathidia p ζ ’-p ζ ” (6, 6; 5, 5 respectively); ta I – IV u’-u” asymmetrically barbed. Femur I with long, barbed dorsal seta (24 – 25). Larva. (3 measured)

Dorsum. ( Fig. 8 View FIGURE 8 ) Body measurements: v 2 –h 1 132, sc 2 –sc 2 63, c 3 –c 3 70, f 3 –f 3 26. Cuticle almost entirely plicate with mostly transverse plicae between setae sc 2 –d 1; central prodorsum and posterior opisthosoma with smooth cuticle. Dorsum with large rounded tubercle anterior to setae c 1. Most opisthosomal setae set on small tubercles, except e 3, f 3, h 1. Most dorsal setae of subequal length, thick, strongly barbed, except setae e 3, f 3, h 1 minute; h 2 elongate, lightly barbed basally: v 2 23, sc 1 29 – 31, sc 2 28 – 29, c 1 22 – 23, c 3 25 – 26, d 1 26 – 29, d 3 26 – 27, e 3 2, f 2 26 – 27, f 3 1 – 2, h 1 1 – 2, h 2 98 – 100.

Gnathosoma   . ( Fig. 8 View FIGURE 8 ) Gnathosoma   extends beyond tibia I. Ventral cuticle longitudinal; ventral setae m absent. Palps with three segmented; 0, 2, 0(2); tarsus with two eupathidia (6; 2); tarsus with two setae (d 7 – 9, v 6 – 7). Cheliceral stylets 80.

Venter. Plicae on cuticle fine, difficult to see, mostly transverse with longitudinal plicae between setae 1 b– 1 a; transverse plicae between setae 1 a–ps 2, oblique laterad ps 1–2. Setal measurements: 1a 79 – 94, 1 b 32, 3 a 25, ps 1 2, ps 2 3.

Legs. ( Fig. 8 View FIGURE 8 ) Setal formulae for legs I – IV: 1 - 0-3 - 0-5 - 6 (1), 0- 0-3 - 0-5 - 6 (1), 0- 0-2 - 0-3 - 3 respectively. Tarsi I and II each with one antiaxial solenidion ω ” (3, 3 respectively) and two distal eupathidia p ζ ’-p ζ ” (5, 6; 5, 5 respectively); ta I – IV u’-u” asymmetrically barbed. Femur I with long, barbed dorsal seta (17 – 18).

Host. Rough saw sedge, Gahnia aspera   sensu lato ( Cyperaceae   ) growing along margin of notophyll vineforest.

Distribution. Mt Hedley, Far North Queensland.

Remarks. Live individuals of this species are yellow in colour and live within grooves on the ventral surface of the leaf blade of its sedge host plant.

Etymology. This species is named for the tubercles present over the dorsum. The Latin word “tuber” means swelling.

BRI

Queensland Herbarium

UQIC

University of Queensland Insect Collection