Crossipalpus gersoni Beard and Seeman,

Beard, Jennifer J., Seeman, Owen D. & Bauchan, Gary R., 2014, Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales), Zootaxa 3778 (1), pp. 1-157: 36-44

publication ID

http://dx.doi.org/10.11646/zootaxa.3778.1.1

publication LSID

lsid:zoobank.org:pub:20D5DCD9-17F5-4863-B627-42B7C349B9A7

persistent identifier

http://treatment.plazi.org/id/194C87D0-FFC5-FFF1-F387-F8A3FBFAFB0F

treatment provided by

Plazi

scientific name

Crossipalpus gersoni Beard and Seeman
status

sp. nov.

Crossipalpus gersoni Beard and Seeman  sp. nov.

( Figs 25–31View FIGURE 25View FIGURE 26View FIGURE 27View FIGURE 28View FIGURE 29View FIGURE 30View FIGURE 31)

Type material examined. Holotype female ex. stems of Allocasuarina luehmannii  ( Casuarinaceae  ), AUSTRALIA: Queensland, near Mount Slopeaway, on the old Marlborough-Sarina Road, 22 ° 52 ’ 16 ” S 149 ° 50 ’ 28 ” E, 19 March 2005, coll. J.J. Beard and P.I. Forster (QM). Paratypes. 14 females, 6 males, 4 deutonymphs, 3 protonymphs, and 4 larvae, same data as holotype (QM, ANIC, USNM).

Diagnosis. Dorsal setae short, broadly lanceolate, strongly barbed; dorsal setae subequal in length except c 1, d 1, e 1, h 1 obviously shorter. Palpal segments as wide as long. Genua I –II with seta d, without l′′; tarsi I –IV without seta tc′′. Solenidia of male much thicker and longer than in female.

Female (n = 15). Dorsum. ( Fig. 25View FIGURE 25 a) Body measurements: distance between setae v 2 -h 1 275–325 [325]; sc 2 - sc 2 88–110 [110]; other measurements: v 2 -v 2 19–22 [22], sc 1 -sc 1 69–89 [89], c 1 -c 1 29–37 [37], c 2 -c 2 105–125 [125], c 3 -c 3 125–145 [145], d 1 -d 1 23–28 [28], d 2 -d 2 89–110 [110], d 3 -d 3 105–130 [130], e 1 - e 1 6–17 [6], e 2 - e 2 92–120 [120], e 3 - e 3 83–100 [100], f 3 -f 3 71–89 [89], h 1 -h 1 14–18 [17], h 2 -h 2 49–58 [58]. Gnathosoma completely concealed beneath prodorsum ( Fig. 26View FIGURE 26). Anterior margin of prodorsum rounded. Seta v 2 inserted dorsally, though its setal base is sometimes partially concealed by an anterior fold ( Fig. 25View FIGURE 25 a). Prodorsal shield weakly developed with papillate-rugose sculpturing laterally, longitudinal grooves medially. Opisthosomal shield weakly developed with rugose to lineate pattern, becoming weakly rugose medially between setae d 1 -e 1. Lateral cuticle surrounding shields rugose-papillate. Most dorsal setae broadly lanceolate, barbed; medial opisthosomal setae shorter than lateral setae, palmate. Setal lengths: v 2 13–17 [17], sc 1 15–19 [19], sc 2 15–21 [21], c 1 8–11 [11], c 2 13–15 [15], c 3 15–22 [22], d 1 5–9 [9], d 2 12–14 [14], d 3 13–18 [18], e 1 4 –7 [7], e 2 14 –17 [17], e 3 14 –17 [17], f 3 15–18 [18], h 1 5–7 [7], h 2 13–17 [17]. Palps. ( Figs 25View FIGURE 25 b, 26) Setal formula 0, 0, 0, 1, 3 (1 s+ 2 e). Tibial seta 6–8 [6] long; tarsal eupathidia 6 long, 5–6 [5] long; solenidion 5–6 [6] long. Vent er. ( Figs 26View FIGURE 26, 27View FIGURE 27 a) Cuticle with fine transverse striae between setae 1 a - 3 a, longitudinal between setae 3 a - 4 a, then convex for 20–30, striae longitudinal posterior to setae 4 a; fine striae become coarse lateral to genital area. Genital setae inserted in more-or-less transverse row, g 1 inserted slightly posterior to level of g 2. Genital shield smooth, poorly developed, ca. 15–20 [16] long, 35–40 [38] wide; anal setae ps 1–2 inserted medially on anal plates in longitudinal line; seta ps 3 absent. Coxal setae fine, except 2 c heavily barbed; setae ag 1, g 1–2, ps 1–2 lanceolate. Setal lengths: 1a 44 – 55 [44], 1 b 20–26 [25], 2 b 13–19 [19], 2 c 14–17 [17], 3a 35 – 50 [50], 3 b 12–22 [22], 4a 40 – 46 [45], 4 b 13–17 [17], ag 1 9–11 [11], g 1 12–15 [15], g 2 12–14 [13], ps 1 7–11 [11], ps 2 8–10 [10]. Spermatheca. ( Fig. 27View FIGURE 27 b) Spermathecal tube long, distinctly broad near external opening, becoming narrow and convoluted distally, maximum 2 wide, ca. 100 long. Thickened part of tube 52–56 long. Spermatheca vesicle not visible. Genital opening between setae ps 2. Legs. ( Fig. 28View FIGURE 28) Setal formula for legs I –IV (coxae to tarsi) 1 - 1-3 - 1-4 - 8 (1), 2 - 1-3 - 1-4 - 8 (1), 1-2 - 2 - 0-3 - 4, 1 - 1 - 1 - 0-3 - 4. Tarsi I and II each with 1 antiaxial solenidion ω" (7–8 [8] long) and 2 eupathidia pζ'-pζ" (6–7 [7] long, 6–8 [8] long). Leg setation as in Table 1 except: coxae I without 1 c; genua I –II with d, without l ′ and l′′; tarsi I –IV without tc′′. Setae v' added to tr IV.

MALE (6 paratypes). Dorsum. ( Figs 29View FIGURE 29, 30View FIGURE 30 a) Body measurements: distance between setae v 2 -h 1 195–225, sc 2 -sc 2 76–81; other measurements: v 2 -v 2 11–13, sc 1 -sc 1 56–63, c 1 -c 1 25–28, c 2 -c 2 78–87, c 3 -c 3 99–110, d 1 -d 1 10–14, d 2 -d 2 68–71, d 3 -d 3 79–87, e 1 - e 1 7–8, e 2 - e 2 67–71, e 3 - e 3 61–65, f 3 -f 3 52–58, h 1 -h 1 8–10, h 2 -h 2 30–40. Gnathosoma not concealed beneath prodorsum. Anterior margin of prodorsum smooth, weakly convex. Prodorsal shield weakly developed. Opisthosoma with mesonotal shield (appearing as a pair of shields) on which at least setae c 1, d 1 and d 2 inserted, with weak rugose-lineate pattern; and pygidial shield with at least setae e 1, e 3, f 3, h 2 inserted, with oblique-longitudinal weakly lineate pattern; setae h 1 often under posterior extension of pygidial shield ( Fig. 30View FIGURE 30 a); shields separated by transverse striae; cuticle laterad mesonotal shield papillate; several minute pores visible on shields. Setal lengths: v 2 13–15, sc 1 13–17, sc 2 15–18, c 1 9–11, c 2 10–12, c 3 12–17, d 1 8–9, d 2 10–12, d 3 12–16, e 1 5, e 2 13 –15, e 3 12 –16, f 3 13–14, h 1 6–7, h 2 12–14. Palps. ( Fig. 29View FIGURE 29) Palps similar to female.

Tibial seta 8 long; tarsal eupathidia 5–6, 6 long; solenidion 7 long. Venter. ( Figs 30View FIGURE 30 b, c) All striae transverse, becoming coarse on opisthogaster and weak around setae ag 1. Coxal setae fine, except 2 c narrowly lanceolate. Setae ag 1, g 2 thick, barbed; g 1, ps 2 thin, barbed; setae ps 1 modified to form thick blades (sexually dimorphic) ( Figs 29View FIGURE 29; 30 a, b). Setal lengths: 1a 33 – 40, 1 b 23–25, 2 b 18–20, 2 c 10–15, 3 a 42–45, 3 b 10–12, 4 a 36–45, 4 b 10– 14, ag 1 7–10, g 1 7–10, g 2 10–11, ps 1 13–16, ps 2 6. Aedeagus. ( Figs 30View FIGURE 30 c, d) Narrow, sclerotised, tapering to a point, 55–61 long. Membranous duct runs from inside aedeagus, becoming indistinguishable. Legs. ( Fig. 29View FIGURE 29) Setal formula same as female. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 9–10 long, ta II 9 long) and 2 eupathidia pζ'-pζ" (ta I 5–6, 6 long; ta II 6, 6 long). Solenidia much thicker and longer than in female.

DEUTONYMPH (4 paratypes). Dorsum. Body measurements: distance between setae v 2 -h 1 215–250, sc 2 -sc 2 71–87; other measurements: v 2 -v 2 18–22, sc 1 -sc 1 57–67, c 1 -c 1 22, c 2 -c 2 76–90, c 3 -c 3 97–113, d 1 -d 1 15–20, d 2 - d 2 56–68, d 3 -d 3 77–94, e 1 - e 1 7–11, e 2 - e 2 68–81, e 3 - e 3 62–78, f 3 -f 3 52–62, h 1 -h 1 11–13, h 2 -h 2 35–39. Prodorsal shield weakly developed with oblique-longitudinal striations. Opisthosoma with setae c 1, d 1 and d 2 on paired, weak platelets. Striae transverse, becoming convex posteriorly. Setal lengths: v 2 12–18, sc 1 16–17, sc 2 16–20, c 1 11–13, c 2 14–17, c 3 13–16, d 1 8–11, d 2 13–17, d 3 14–17, e 1 5, e 2 14 –17, e 3 14 –15, f 3 13–15, h 1 6–8, h 2 13–16. Palps. Palps similar to adult. Tibial seta 6 long; tarsal eupathidia 3, 4 long, solenidion 4 long. Venter. Cuticle with transverse striae anteriorly, longitudinal between setae 3 a- 4 a, then transverse, becoming concave, to ag 1, then transverse and coarse to posterior margin. Coxal setae fine, except 2 c barbed; setae ag 1 narrowly lanceolate, g 1 barbed. Setal lengths: 1a 35 – 40, 1 b 12–16, 2 b 11–17, 2 c 12–14, 3 a 26–36, 3 b 10–15, 4 a 27–30, 4 b 10–15, ag 1 8– 10, g 1 8–12, ps 1 6–8, ps 2 6–8. Legs. Setal formula for legs I –IV (coxae to tarsi) 1 - 1-3 - 1-4 - 8 (1), 2 - 1-3 - 1-4 - 8 (1), 1- 2 - 2 - 0-3 - 4, 1 - 0-1 - 0-3 - 4. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 4–6 long, ta II 4–5 long) and 2 eupathidia pζ'-pζ" (5, 5–6 long). Leg setation as in adult except: tr IV without seta v ′. Setae v' added to tr I –III.

PROTONYMPH (3 paratypes). Dorsum. Body measurements: distance between setae v 2 -h 1 158–181, sc 2 -sc 2 64–70; other measurements: v 2 -v 2 16–19, sc 1 -sc 1 52–57, c 1 -c 1 16–24, c 2 -c 2 63–76, c 3 -c 3 97–99, d 1 -d 1 16–17, d 2 -d 2 49–51, d 3 -d 3 67–73, e 1 - e 1 6, e 2 - e 2 64–67, e 3 - e 3 57–61, f 3 -f 3 43–44, h 1 -h 1 22–24, h 2 -h 2 7–9. Prodorsal shield weakly developed. Opisthosoma with setae c 1, d 1 and d 2 on paired, weak platelets. Striae of idiosoma similar to deutonymph. Setal lengths: v 2 13–15, sc 1 14–15, sc 2 14–15, c 1 12–13, c 2 14–16, c 3 13–14, d 1 11, d 2 13–14, d 3 14, e 1 4 –5, e 2 12, e 3 14 –15, f 3 9–13, h 1 4–5, h 2 9–15. Palps. Palps similar to deutonymph except solenidion 3 long. Venter. Same as deutonymph. Coxal setae fine, except 2 b, ag 1 barbed. Setal lengths: 1a 36, 1 b 11–13, 2 b 13–16, 3 a 30, 3 b 9, ag 1 7, ps 1 5, ps 2 5–6. Setae 2 c, 4 a, 4 b, g 1, g 2 absent. Legs. Setal formula for legs I – IV (coxae to tarsi) 1 - 0-3 - 0-4 - 8 (1), 1 - 0-3 - 0-4 - 8 (1), 1 - 1-2 - 0-3 - 4, 0- 0-1 - 0-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (4 long) and 2 eupathidia pζ'-pζ" (5, 4 – 5 long). Leg setation as in deutonymph except: seta 2 c absent; seta 4 b absent; tr I –III without seta v ′; ge I –II without seta d; ta IV without setae tc ′. Setae l' added to tr III.

LARVA (4 paratypes). Dorsum. ( Fig. 31View FIGURE 31) Body measurements: distance between setae v 2 -h 1 130–150, sc 2 -sc 2 55–60; other measurements: v 2 -v 2 13–15, sc 1 -sc 1 43–49, c 1 -c 1 12–16, c 2 -c 2 51–55, c 3 -c 3 84–85, d 1 -d 1 13–15, e 1 - e 1 4–5, e 2 - e 2 57–62, e 3 - e 3 38–44, f 3 -f 3 11–13, h 1 -h 1 5–7, h 2 -h 2 10–13. Prodorsal shield weakly formed, 58– 60 long, 61–66 wide, with few irregular striations. Opisthosomal shields absent; coarse, irregular transverse striae becoming oblique posteriorly. Setal lengths: v 2 11–14, sc 1 12–13, sc 2 14–15, c 1 10, c 2 12–14, c 3 11, d 1 9–11, d 2 11–14, d 3 11–13, e 1 3 –4, e 2 11 –15, e 3 11 –12, f 3 11–13, h 1 4–5, h 2 11–14. Palps. ( Fig. 31View FIGURE 31 a) Palps same as deutonymph. Tibial seta 5–6 long; tarsal eupathidia 2, 3 long, solenidion 2–3 long. Venter. ( Fig. 31View FIGURE 31 b) Striation same as deutonymph. All setae fine. Setal lengths: 1a 17 – 27, 1 b 9–13, 3 a 25–33, ps 1 4–5, ps 2 4–5. Legs. ( Fig. 31View FIGURE 31 c) Setal formula for legs I –III (coxae to tarsi) 1 - 0-3 - 0-4 - 7 (1), 0- 0-3 - 0-4 - 7 (1), 0- 0-2 - 0-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (3 long) and 2 eupathidia pζ'-pζ" (ta I 4, 4 long; ta II 5, 5 long). Leg setation as in protonymph except: seta 2 b absent; seta 3 b absent; tr I –III nude; ta I –III without seta tc ′.

Etymology. It is with great pleasure that we name this species for our colleague and friend Prof. Uri Gerson, in recognition of his acarological works, especially those on the Tegopalpinae.

Remarks. Crossipalpus gersoni  sp. nov. was found on Bull-Oak Allocasuarina luehmannii  in Eucalyptus fibrosa  woodland on red soil, with vine thicket in small patches.

This species is similar to Cr. raveni  sp. nov., as they both have seta d present on ge I –II, but Cr. gersoni  has spatulate setae d on femora and genua I –II (lanceolate in Cr. raveni  ), and posterior ventral setae are thick, broadly lanceolate and strongly barbed (thin, setiform and weakly barbed in Cr. raveni  ).

ANIC

Australian National Insect Collection

USNM

Smithsonian Institution, National Museum of Natural History