Pentamerismus sititoris 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: 89-95

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-FFBE-FF84-F387-F8CFFC80F8D5

treatment provided by

Plazi

scientific name

Pentamerismus sititoris Beard and Seeman
status

sp. nov.

Pentamerismus sititoris Beard and Seeman  sp. nov.

( Figs 75–81View FIGURE 75View FIGURE 76View FIGURE 77View FIGURE 78View FIGURE 79View FIGURE 80View FIGURE 81)

Type material examined. Holotype female ex. Belah  Casuarina cristata  ( Casuarinaceae  ), AUSTRALIA: New South Wales, Newell Highway, approx. 15 km N Moree, 86 km S Goondiwindi, 29 ° 21 ’ 20 ” S 150 °00’ 24 ” E, 21 August 2007, coll. J.J. Beard and P.I. Forster (QM). Paratypes. 8 females, 1 male, 2 deutonymphs, 2 protonymphs, larva, same data as holotype (QM, ANIC).

Non-type material examined. 5 females, 1 male, 2 deutonymphs, 2 protonymphs, 2 larvae, same data as holotype; 12 females, 10 males, 1 protonymph, 1 larva ex. Casuarina cristata  ( Casuarinaceae  ) under scales at tip of needles, AUSTRALIA: New South Wales, nr Lightning Ridge, Castlereagh Highway, 45 km S Hebel, 28 ° 44 ′ 43 ′′S, 148 °09’ 12 ′′E, 0 6 May 2007, coll. J.J. Beard and P.I. Forster; AUSTRALIA: 1 female, 1 male, same data except Castlereagh Highway, 6.5 km N Lightning Ridge, 29 ° 25 ′ 10 ′′S, 147 ° 53 ′ 21 ′′E (QM, USNM)).

Diagnosis. Dorsal opisthosomal setae f 2 present. Palp setal formula 0-0- 0-2 - 3 (1), with palp tibial setae l ′PTi and l′′PTi both present. Anterior margin of prodorsal shield with short notch. Dorsal shields with finely reticulate mosaic sculpturing; dorsal setae broadly lanceolate to palmate; lateral margins of opisthosoma coarsely papillate. Posterior ventral setae ag palmate, barbed; setae g 1–2 broadly lanceolate, barbed; setae ps 1–2 lanceolate, barbed; setae ps 3 fine, smooth. Seta 1 c absent. Setae d on femora and genua I –II palmate to broadly lanceolate, barbed; seta ev ′ on femora III broadly lanceolate, barbed; setae v ′, v′′ on tibiae III with broad bases, barbed.

FEMALE (n = 28). Dorsum. ( Fig. 75View FIGURE 75) Body measurements: distance between setae v 2 -h 1 225–255 [250], sc 2 - sc 2 110–120 [120]; other measurements: v 2 -v 2 41 –46 [43], sc 1 -sc 1 83–88 [84], c 1 -c 1 54–63 [63], c 2 -c 2 125–135 [135], c 3 -c 3 170–180 [175], d 1 -d 1 34–40 [40], d 2 -d 2 105–115 [115], d 3 -d 3 150–155 [155], e 1 - e 1 32–39 [39], e 2 - e 2 135–145 [145], e 3 -e 3 120–140 [130], f 2 -f 2 110–115 [115], f 3 -f 3 89–100 [95], h 1 -h 1 27–32 [30], h 2 -h 2 60–68 [68]. Anterior margin of prodorsal shield with 1 pair of small lobes forming short medial notch (internal depth 7– 11). Dorsal shields with finely reticulate mosaic sculpturing. Lateral cuticle surrounding shields smooth anteriorly, becoming coarsely papillate posteriorly. All dorsal setae barbed; v 2, sc 1, sc 2, c 1–3 lanceolate with broadly rounded tips; all other setae broad, rounded. Setal lengths: v 2 23–24 [23], sc 1 23–26 [26], sc 2 25–30 [30], c 1 24–28 [25], c 2 24–28 [28], c 3 21–24 [24], d 1 17–20 [17], d 2 19–26 [20], d 3 19–23 [23], e 1 17 –22 [19], e 2 17 –20 [20], e 3 17 –20 [19], f 2 17–20 [19], f 3 17–21 [17], h 1 17–20 [17], h 2 16–19 [19]. Palps. ( Fig. 75View FIGURE 75) Setal formula 0, 0, 0, 2, 3 (1 s+ 2 e). Tibial setae, dorsal 7–8 [7] long, ventral 4–5 [4] long; tarsal eupathidia 4 [4], 4–6 [6] long; solenidion 6 [6] long. Venter. ( Fig. 76View FIGURE 76 a) Cuticle with transverse striae, abruptly becoming longitudinal posterior to cx IV, extending to genital area; fine striae become coarse lateral to genital area. Circular thickening present in metapodal region, ca. 20–24 diameter, rugose-papillate. Setae g 1 inserted in more-or-less transverse line with g 2, g 2 slightly anterior to g 1. Genital shield lightly punctate with transverse reticulation posteriorly, margins irregular, ca. 25–35 [25] long, 36–42 [42] wide; anal setae ps 1–3 inserted in longitudinal row on anal plates. Coxal setae fine, except 2 c lanceolate; setae ag 1 palmate, barbed; g 1–2, ps 1–2 thick, broadly lanceolate, barbed; ps 3 fine, smooth. Setal lengths: 1a 40 – 51 [40], 1 b 24–32 [24], 2 b 22–28 [24], 2 c 14–16 [14], 3a 35 – 41 [35], 3 b 13–19 [13], 4a 32 – 35 [32], 4 b 12–18 [12], ag 1 13–15 [13], g 1 17–18 [17], g 2 16–18 [18], ps 1 12–17 [13], ps 2 12–15 [12], ps 3 7–10 [10]. Spermatheca. ( Fig. 76View FIGURE 76 b) Spermathecal tube long, narrow, convoluted, 1 Μm wide, ca. 120 long, terminating in membranous sac. Spermatheca vesicle not visible. Genital opening between anal valves and posterior margin of genital shield. Legs. ( Figs 75View FIGURE 75, 77View FIGURE 77 a) Setal formula for legs I –IV (coxae to tarsi) 1 - 1-3 - 3-4 - 9 (1), 2 - 1-3 - 3-4 - 9 (1), 1-2 - 2 - 1-3 - 5, 1 - 1 - 1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 11 [11] long, ta II 10–11 [10] long) and 2 eupathidia pζ'-pζ" (ta I 6–7 [6], 7 [7] long; ta II 6–7 [6], 6 [6] long). Leg setation as in Table 1 except: coxae I without 1 c. Setae v' added to tr IV.

MALE (n = 13). Dorsum. ( Fig. 78View FIGURE 78) Body measurements: distance between setae v 2 -h 1 195–210, sc 2 -sc 2 90– 105; other measurements: v 2 -v 2 32 –35, sc 1 -sc 1 66–79, c 1 -c 1 40–55, c 2 -c 2 96–120, c 3 -c 3 135–155, d 1 -d 1 24–37, d 2 -d 2 80–106, d 3 -d 3 110–140, e 1 - e 1 34–42, e 2 -e 2 105–130, e 3 - e 3 97–120, f 2 -f 2 87–105, f 3 -f 3 71–90, h 1 -h 1 25– 27, h 2 -h 2 54–63. Anterior margin of prodorsum with small lobes forming a short median notch (internal depth 7). Prodorsal, mesonotal and pygidial shields with sculpture and dorsal setae similar to female. Setal lengths: v 2 18– 21, sc 1 18–22, sc 2 19–22, c 1 18–20, c 2 19–21, c 3 20–22, d 1 12–13, d 2 16–20, d 3 16–17, e 1 13 –15, e 2 16 –18, e 3 16 –20, f 2 15–16, f 3 14–18, h 1 15–16, h 2 14–16. Palps. ( Fig. 78View FIGURE 78) Palps similar to female. Tibial setae, dorsal 6 long, ventral 5 long; tarsal eupathidia 4–5, 4 – 6 long; solenidion 5–6 long. Venter. ( Fig. 79View FIGURE 79) Striation similar to female. Posterior opisthosoma with 2 irregular, poorly defined, striated subcircular plates, ca. 25–30 x 30 –45 diameter; g 1– 2, ps 1–3 on weakly sclerotised anal valves. Coxal setae fine, except 2 c lanceolate. Seta ag 1 broadly rounded, barbed; g 1 lanceolate, barbed; ps 1 spine-like, thickened. Setal lengths: 1a 45 – 65, 1 b 20–23, 2 b 17–19, 2 c 10–13, 3 a 40–42, 3 b 9–12, 4 a 25–27, 4 b 8–12, ag 1 12, g 1 12–13, g 2 6–7, ps 1 13–15, ps 2 6–7, ps 3 7. Aedeagus. ( Fig. 79View FIGURE 79) Narrow, sclerotised, tapering to a point, 63–74 long. Membranous duct runs from inside aedeagus,

becoming obscure after 20–55 Μm. Legs. ( Fig. 78View FIGURE 78) Setal formula same as female. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 13 long, ta II 12 long) and 2 eupathidia pζ'-pζ" (6 long, 5–6 long). Solenidia slightly thicker and longer than in female.

DEUTONYMPH (n = 3). Dorsum. ( Fig. 80View FIGURE 80) Body measurements: distance between setae v 2 -h 1 215–235, sc 2 - sc 2 105–115; other measurements: v 2 -v 2 34 –39, sc 1 -sc 1 84–89, c 1 -c 1 34–43, c 2 -c 2 110–120, c 3 -c 3 155, d 1 -d 1 38–39, d 2 -d 2 105–115, d 3 -d 3 145–155, e 1 - e 1 32–34, e 2 -e 2 138–143, e 3 -e 3 125–130, f 2 -f 2 110–115, f 3 -f 3 83–90, h 1 -h 1 31–32, h 2 -h 2 53–60. Anterior margin of prodorsum without medial lobes or notch. Prodorsal shield poorly defined, with oblique-longitudinal striations. Opisthosomal shield absent; transverse striae between setal row C and row D; posterior to setal row D striations become oblique laterally, tending to mosaic-like medially. Lateral setae more elongate than those of adult, slightly concave. Setal lengths: v 2 15–18, sc 1 15–18, sc 2 18–21, c 1 11–17, c 2 18–20, c 3 26–27, d 1 15, d 2 24–26, d 3 26–27, e 1 18 –20, e 2 23 –26, e 3 23 –26, f 2 20–24, f 3 22–26, h 1 19–23, h 2 22– 25. Palps. ( Fig. 80View FIGURE 80) Palps similar to adult. Tibial setae, dorsal 6 long, 4 long; tarsal eupathidia 3, 4 long; solenidion 4 long. Venter. Cuticle with transverse striae, becoming coarse behind cx IV; anal setae ps 1–3 on weakly defined anal plates. Coxal setae fine, except 2 c barbed; setae ag 1 thick, barbed. Setal lengths: 1a 27 – 45, 1 b 12–15, 2 b 11– 16, 2 c 9–11, 3 a 33, 3 b 6–9, 4 a 17–24, 4 b 6–8, ag 1 8–10, g 1 11, ps 1 3, ps 2 4–5, ps 3 4–5. Legs. ( Figs 77View FIGURE 77 b, 80) Setal formula for legs I –IV (coxae to tarsi) 1 - 1-3 - 3-4 - 9 (1), 2 - 1-3 - 3-4 - 9 (1), 1-2 - 2 - 1-3 - 5, 1 - 0-1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 6–7 long, ta II 5–6 long) and 2 eupathidia pζ'-pζ" (3–4, 4 long). Leg setation as in adult except: tr IV without seta v ′. Setae v' added to tr I –III.

PROTONYMPH (n = 6). Dorsum. Body measurements: distance between setae v 2 -h 1 165–195, sc 2 -sc 2 78– 90; other measurements: v 2 -v 2 26–31, sc 1 -sc 1 65–69, c 1 -c 1 28–32, c 2 -c 2 89–98, c 3 -c 3 130–135, d 1 -d 1 22–29, d 2 - d 2 84–89, d 3 -d 3 110–125, e 1 - e 1 18–22, e 2 -e 2 100–110, e 3 - e 3 95–105, f 2 -f 2 76–90, f 3 -f 3 70–73, h 1 -h 1 19–24, h 2 - h 2 40–50. Anterior margin of prodorsum without medial notch. Prodorsal shield absent, prodorsum with concave striations. Opisthosomal shield absent; transverse striae gradually becoming oblique, tending to convex posteriorly. Setae more elongate than those of adult. Setal lengths: v 2 10–15, sc 1 12–14, sc 2 13–15, c 1 11–12, c 2 14–15, c 3 14– 20, d 1 9–12, d 2 17–21, d 3 25–26, e 1 14 –17, e 2 16 –22, e 3 19 –23, f 2 21–23, f 3 17–21, h 1 18–20, h 2 20–23. Palps. Palps similar to adult. Tibial setae, dorsal 5–6 long, 4 long; tarsal eupathidia both 3 long; solenidion 3–4 long. Venter. Cuticle with transverse striae, becoming coarse behind cx IV. Anal setae ps 1–3 on weakly defined anal plates. Coxal setae fine. Setal lengths: 1a 15 – 17, 1 b 6–7, 2 b 7, 3a 12 – 23, 3 b 6, ag 1 7, ps 1 2–3, ps 2 2–3, ps 3 3. Legs. ( Fig. 81View FIGURE 81 a) Setal formula for legs I –IV (coxae to tarsi) 1 - 0-3 - 1-4 - 9 (1), 1 - 0-3 - 1-4 - 9 (1), 1 - 1-2 - 1-3 - 5, 0- 0-1 - 0-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (4 long) and 2 eupathidia pζ'-pζ" (ta I 4 long; ta II 3 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, l′′; ta IV without setae tc ′, tc′′. Setae l' added to tr III.

LARVA (n = 3). Dorsum. Body measurements: distance between setae v 2 -h 1 130–155, sc 2 -sc 2 65–67; other measurements: v 2 -v 2 22–25, sc 1 -sc 1 50–53, c 1 -c 1 17–18, c 2 -c 2 68–74, c 3 -c 3 90, d 1 -d 1 12, d 2 -d 2 60, d 3 -d 3 80, e 1 - e 1 7, e 2 - e 2 67, e 3 - e 3 55, f 2 -f 2 45, f 3 -f 3 30, h 1 -h 1 8, h 2 -h 2 16–38. Anterior margin of prodorsum without medial notch. Prodorsal shield absent, with longitudinal striations becoming broader medially. Opisthosomal shield absent; coarse, irregular transverse striae. Setae with more elongate proportions than those of adult. Setal lengths: v 2 13–15, sc 1 15–18, sc 2 13, c 1 12, c 2 15–17, c 3 14–17, d 1 17–18, d 2 15, d 3 15, e 1 19, e 2 15, e 3 15 –16, f 2 16, f 3 17, h 1 14, h 2 15. Palps. ( Fig. 81View FIGURE 81 c) Palps similar to adult. Tibial setae, dorsal 5–6 long, venter 4–5 long; tarsal eupathidia 3–4, 4 long; solenidion 4 long. Venter. Cuticle with transverse striae, becoming coarse behind cx IV. Anal setae ps 1–3 on weakly defined anal plates. Coxal setae fine. Setal lengths: 1a 22 – 35, 1 b 9–10, 3 a 27–40, ps 1 3–4, ps 2 3–4, ps 3 3–4. Legs. ( Fig. 81View FIGURE 81 b) Setal formula for legs I –III (coxae to tarsi) 1 - 0-3 - 1-4 - 7 (1), 0- 0-3 - 1-4 - 7 (1), 0- 0-2 - 1-3 - 3. 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" (ta I 4–5 long; ta II 3–4 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 ′, tc′′.

Etymology. The specific name sititoris  , is masculine Latin for “one who thirsts”, in reference to the dry habitat in which this species lives.

Remarks. These mites were matt red and found hiding in leaf buds and under leaf scales. Individuals of this species were found in association with Chaudhripalpus costacola  and Philippipalpus belah  .

Pentamerismus sititoris  is similar to P. hicklingorum  and P. w a rd o, but can be separated from these two species by the posterior ventral setae g 1–2 and ps 1–2 being thick, broadly lanceolate and heavily barbed, and setae ag being palmate and strongly barbed (setae g 1–2 fine, setiform and weakly barbed, setae ps 1 thicker than ps 2–3, and setae ag setiform to lanceolate in P. hicklingorum  and P. w a rd o).

ANIC

Australian National Insect Collection

USNM

Smithsonian Institution, National Museum of Natural History