Palpipalpus hesperius 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: 81-89

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-FFB6-FF82-F387-FE1EFAB8FB3C

treatment provided by

Plazi

scientific name

Palpipalpus hesperius Beard and Seeman
status

sp. nov.

Palpipalpus hesperius Beard and Seeman  sp. nov.

( Figs 67–74View FIGURE 67)

Type material examined. Holotype female ex. Allocasuarina  sp. ( Casuarinaceae  ), AUSTRALIA: Western Australia, Walpole, Nornalup Inlet, Coalmine Beach, Walpole Yacht Club, 34 º 59 ’ 27 ” S 116 º 44 ’ 22 ” E, 0 9 May 2008, coll. J.J. Beard and R. Ochoa ( WAM) ( BRI voucher). Paratypes. 23 females, 2 males (separate slides); 1 male, 1 pharate deutonymph (same slide); 2 deutonymphs, 7 protonymphs, 5 larvae, same data as holotype ( WAM, QM, ANIC, USNM).

Non-type material examined. 2 pharate deutonymphs, 1 pharate protonymph, same data as holotype (QM); 10 females, 1 pharate female, 14 deutonymphs, 2 pharate deutonymphs, 9 protonymphs, 9 larvae ex. stems of Western She-oak Allocasuarina fraseriana  ( Casuarinaceae  ) [on ridge], AUSTRALIA: Western Australia, internal road to Wellington Dam, Wellington National Park, 33 º 20 ’ 24 ’’ S 115 º 57 ’ 22 ’’ E, 20 April 2009, coll. J.J. Beard (QM) ( BRI voucher); 14 females, 3 males, 3 pharate females, 2 deutonymphs, 4 protonymphs, 2 larvae ex. Allocasuarina  sp., AUSTRALIA: Western Australia, Wellington National Park, 33 º 19 ’ 18 ’’ S 115 º 58 ’ 50 ’’ E, 0 6 May 2008, coll. J.J. Beard and R. Ochoa (QM).

Diagnosis. Dorsal setae short, palmate, heavily barbed. Dorsal opisthosomal setae e 2 and f 2 inserted close to marginal position. Prodorsum with oblique folds and weakly papillate sculpturing; dorsal opisthosomal shield with transverse to oblique folds laterally, with weak papillate sculpturing anteriorly; lateral cuticle papillate. Setae v ′ added to tr II and IV in the adult (v ′ normally added to tr II in deutonymph).

FEMALE (n = 48). Dorsum. ( Fig. 67View FIGURE 67 a) Body measurements: distance between setae v 2 -h 1 280–325 [325]; sc 2 - sc 2 111–125 [120]; other measurements: v 2 -v 2 35 –42 [42], sc 1 -sc 1 83–96 [91], c 1 -c 1 26–36 [33], c 2 -c 2 91–110 [100], c 3 -c 3 160–185 [180], d 1 -d 1 20–25 [22], d 2 -d 2 110–120 [120], d 3 -d 3 140–155 [145], e 1 - e 1 15–17 [15], e 2 - e 2 125–135 [125], e 3 -e 3 115–135 [125], f 2 -f 2 93–110 [100], f 3 -f 3 81–105 [98], h 1 -h 1 18–32 [21], h 2 -h 2 53–76 [61]. Gnathosoma partially concealed by prodorsum. Anterior margin of prodorsum with pair of lobes forming a shallow median notch (internal depth 8–13); lobes anterior to setae v 2. Prodorsal shield with rugose-lineate sculpturing. Opisthosomal shield mostly with rugose sculpturing, but becoming smooth between d 1 -e 1, three longitudinal ridges between c 1 -c 1 and d 1 -d 1, and several ridges between e 1 -h 1. Lateral cuticle surrounding shields papillate, cuticle between shields papillate to tessellate. All dorsal setae barbed, lanceolate. Setal lengths: v 2 13–19 [17], sc 1 16–18 [16], sc 2 17–19 [17], c 1 18–20 [20], c 2 18–20 [19], c 3 17–18 [18], d 1 14–17 [14], d 2 15–17 [broken], d 3 13–17 [16], e 1 9 –11 [10], e 2 13 –17 [15], e 3 12 –18 [15], f 2 11–17 [13], f 3 14–18 [17], h 1 11–15 [13], h 2 14–17 [16]. Palps. ( Fig. 67View FIGURE 67 b) Setal formula 0, 0, 0, 2, 3 (1 s+ 2 e). Tibial setae, dorsal 10–11 [11] long, ventral 6–9 [7] long; tarsal eupathidia 5–6 [5] long, 7–9 [8] long; solenidion 7–8 [8] long. Venter. ( Fig. 68) Cuticle with transverse striae, becoming longitudinal midway between 4 a and ag, extending to genital area; fine striae become coarse lateral to genital area. Setae g 1 inserted in more-or-less transverse line with g 2, g 2 slightly anterior to g 1. Genital shield smooth, poorly defined, ca. 17–26 [22] long, 36–45 [45] wide; anal setae ps 1–2 inserted in longitudinal row on anal plates; setae ps 1 absent. Coxal setae fine, smooth except 2 c with weak barbs; setae ag 1, g 1–2, ps 1 barbed, ps 2 smooth. Setal lengths: 1a 42 – 55 [55], 1 b 18–28 [20], 2 b 17–22 [21], 2 c 20–27 [24], 3a 35 – 52 [35], 3 b 18–22 [20], 4a 33 – 43 [40], 4 b 16–22 [22], ag 1 17–21 [18], g 1 21–23 [22], g 2 18–23 [22], ps 1 13–17 [14], ps 2 12–14 [13]. Spermatheca. ( Fig. 69View FIGURE 69) Spermathecal tube long, 1 wide, straight for ca. 30, then convoluted for another ca. 100, terminating in membranous sac 7–9 long, 2–3 wide. Genital opening between setae ps 2. Legs. ( Fig. 70View FIGURE 70) Setal formula for legs I –IV (coxae to tarsi) 1 - 1-3 - 2-4 - 9 (1), 2 - 1-3 - 2-4 - 9 (1), 1-2 - 2 - 0-3 - 5, 1 - 1 - 1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (9-10 [10] long) and 2 eupathidia pζ'-pζ" (8–9 [8–9] long). Leg setation as in Table 1 except: coxae I without 1 c; genua I –II with d and l" (ge I –II without l ′, ge III –IV nude). Setae v' added to tr II and IV.

MALE (n = 6). Dorsum. ( Fig. 71View FIGURE 71 a) Body measurements: distance between setae v 2 -h 1 215–235, sc 2 -sc 2 92– 98; other measurements: v 2 -v 2 23–30, sc 1 -sc 1 66–75, c 1 -c 1 21–29, c 2 -c 2 79–87, c 3 -c 3 114–125, d 1 -d 1 10–15, d 2 - d 2 85–91, d 3 -d 3 95–110, e 1 - e 1 12–17, e 2 - e 2 87–92, e 3 - e 3 83–88, f 2 -f 2 70–88, f 3 -f 3 62–75, h 1 -h 1 9–15, h 2 -h 2 24– 36. Anterior margin of prodorsum with small lobes forming a shallow median notch (internal depth 9–11). Prodorsal, mesonotal and opisthonotal shields surrounded by striate cuticle medially, papillate cuticle laterally. Shield sculpture and dorsal setae similar to female, but sculpture not as rugose on mesonotal and opisthonotal shield. Setal lengths: v 2 14–18, sc 1 13–15, sc 2 14–17, c 1 15–16, c 2 14–15, c 3 14–17, d 1 11–13, d 2 14–15, d 3 13– 15, e 1 10 –11, e 2 10 –14, e 3 14 –15, f 2 11–13, f 3 14–15, h 1 10–11, h 2 14–15. Palps. ( Fig. 71View FIGURE 71 a) Palps similar to female. Tibial setae, dorsal 9–11 long, ventral 6–7 long, tarsal eupathidia 3–4, 9 long; solenidion 10 long. Venter. Striation similar to female. Coxal setae fine, except 2 c with few minute barbs. Seta ag 1, g 1–2, ps 2 smooth. Setae ps 1 blade-like, thickened (sexually dimorphic). Setal lengths: 1a 45 – 55, 1 b 17–27, 2 b 18–27, 2 c 17–20, 3 a 33–47, 3 b 15–22, 4 a 30–45, 4 b 16–23, ag 1 12–17, g 1 9–12, g 2 12–15, ps 1 14–17, ps 2 8–10. Aedeagus. ( Fig. 71View FIGURE 71 b) Narrow, sclerotised, tapering to a point, 55–60 long. Membranous duct runs from inside aedeagus. Legs. ( Fig. 72View FIGURE 72) Setal formula same as female. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 12–13 long, ta II 11–12 long) and 2 eupathidia pζ'-pζ" (ta I 7–8 long; ta II 6–8, 7– 8 long). Solenidia swollen, much thicker and longer than in female.

DEUTONYMPH (n = 18). Dorsum. Body measurements: distance between setae v 2 -h 1 225–275, sc 2 -sc 2 85– 96; other measurements: v 2 -v 2 22–30, sc 1 -sc 1 68–79, c 1 -c 1 21–37, c 2 -c 2 78–89, c 3 -c 3 125–145, d 1 -d 1 16–21, d 2 - d 2 74–84, d 3 -d 3 97–115, e 1 - e 1 14–20, e 2 - e 2 90–110, e 3 - e 3 86–102, f 2 -f 2 72–84, f 3 -f 3 58–83, h 1 -h 1 18–27, h 2 -h 2 31–60. Anterior margin of prodorsum without medial notch. Prodorsal shield with weakly rugose sculpturing and punctate cuticle. Opisthosomal shield covered with patches of weakly rugose sculpturing on punctate cuticle (c 1 - c 2, d 1 -d 2 on irregular plates) interspersed by coarse irregularly transverse striae. Setal lengths: v 2 22, sc 1 16–20, sc 2 19–21, c 1 18–22, c 2 16–18, c 3 17–21, d 1 13–18, d 2 16–19, d 3 17–21, e 1 11 –14, e 2 16 –22, e 3 14 –18, f 2 14–17, f 3 16–21, h 1 11–14, h 2 16–20. Palps. Palps similar to adult. Tibial setae, dorsal 6–7 long, ventral 8–9 long; tarsal eupathidia 4, 6–8 long; solenidion 5–7 long. Venter. Cuticle with transverse striae to midway between 4 a and ag, becoming longitudinal, striae coarse around anal region. Anal setae ps 1–2 on weakly defined anal plates. Coxal setae fine; setae ag 1, g 1, ps 1–2 smooth. Setal lengths: 1a 33 – 35, 1 b 13–20, 2 b 12–18, 2 c 20–21, 3 a 28–37, 3 b 14, 4a 20 – 31, 4 b 10–15, ag 1 11–14, g 1 14–18, ps 2 6–8, ps 3 7–8. Legs. Setal formula for legs I –IV (coxae to tarsi) 1 - 1- 3 - 2-4 - 9 (1), 2 - 0-3 - 2-4 - 9 (1), 1-2 - 2 - 0-3 - 5, 1 - 0-1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (6–7 long) and 2 eupathidia pζ'-pζ" (6–8 long). Leg setation as in female, except tr II and tr IV without seta v ′. Setae v' added to tr I and III.

PROTONYMPH (n = 20). Dorsum. Body measurements: distance between setae v 2 -h 1 175–205, sc 2 -sc 2 72– 87; other measurements: v 2 -v 2 18–29, sc 1 -sc 1 56–70, c 1 -c 1 16–22, c 2 -c 2 63–78, c 3 -c 3 100–135, d 1 -d 1 11–19, d 2 - d 2 59–72, d 3 -d 3 80–110, e 1 - e 1 8–13, e 2 - e 2 72–87, e 3 - e 3 68–76, f 2 -f 2 52–62, f 3 -f 3 42–53, h 1 -h 1 12–18, h 2 -h 2 25– 34. Anterior margin of prodorsum without medial notch. Prodorsal shield with weakly rugose sculpturing and punctate cuticle. Opisthosomal shield with the setae c 1 -c 2 and d 1 -d 2 on separate paired plates, each with weakly rugose sculpturing on punctate cuticle. Irregular pygidial shield bears e 1, f 2 -f 3, sculpturing similar to other shields. Setal lengths: v 2 16–21, sc 1 13–18, sc 2 15–20, c 1 15–18, c 2 13–19, c 3 14–18, d 1 11–18, d 2 14–18, d 3 13–19, e 1 9 –13, e 2 13 –18, e 3 14 –20, f 2 12–15, f 3 13–18, h 1 10–13, h 2 14–18. Palps. Palps similar to adult. Tibial seta, dorsal 4–5 long, ventral 7–8 long; tarsal eupathidia 3, 5–6 long; solenidion 5 long. Venter. Striation similar to deutonymph. Anal setae ps 2–3 on weakly defined anal plates. Coxal setae fine; setae ag 1, g 1, ps 1–2 smooth. Setal lengths: 1a 33 – 40, 1 b 14–17, 2 b 15–19, 3 a 25–30, 3 b 8–17, ag 1 11–14, ps 1 5–7, ps 2 5–7. Legs. Setal formula for legs I –IV (coxae to tarsi) 1 - 0-3 - 0-4 - 9 (1), 1 - 0-3 - 0-4 - 9 (1), 1 - 1-2 - 0-3 - 5, 0- 0-1 - 0-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (5–6 long) and 2 eupathidia pζ'-pζ" (5–6 long). Leg setation as in deutonymph except: seta 2 c absent; seta 4 b absent; tr I and 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 = 16). Dorsum. ( Fig. 73View FIGURE 73) Body measurements: distance between setae v 2 -h 1 155–175, sc 2 -sc 2 67– 74; other measurements: v 2 -v 2 16–31, sc 1 -sc 1 55–60, c 1 -c 1 9–16, c 2 -c 2 62–70, c 3 -c 3 96–104, d 1 -d 1 6–11, d 2 -d 2 58–59, d 3 -d 3 76–81, e 1 - e 1 4–6, e 2 - e 2 67–70, e 3 - e 3 40–67, f 2 -f 2 42–54, f 3 -f 3 29–40, h 1 -h 1 4–8, h 2 -h 2 15–23. Anterior margin of prodorsum without medial notch. Prodorsal shield smooth with few creases. Irregular, weakly rugose pygidial shield. Lateral cuticle smooth to striate; cuticle between shields irregular coarse striae. Setal lengths: v 2 14–19, sc 1 11–13, sc 2 16–18, c 1 13–17, c 2 11–16, c 3 12–15, d 1 14–16, d 2 12–14, d 3 12–15, e 1 9 –15, e 2 13 –15, e 3 10 –15, f 2 11–14, f 3 12–15, h 1 13, h 2 11–14. Palps. ( Fig. 73View FIGURE 73) Palps similar to adult. Tibial setae, dorsal 6–7 long, ventral 5 long; tarsal eupathidia 3–4, 5 – 6 long; solenidion 4 long. Venter. ( Fig. 74) Striation similar to deutonymph. Anal setae ps 1–2 on weakly defined anal plates. Coxal setae fine. Setal lengths: 1a 24 – 27, 1 b 13–17, 3 a 29–33, ps 1 6–8, ps 2 5–7. Legs. ( Fig. 73View FIGURE 73) 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" (4 long) and 2 eupathidia pζ'-pζ" (4–5, 4 – 5 long). Leg setation as in protonymph except: seta 2 b absent; seta 3 b absent; tr III without l ′; ta I –III without seta tc ′, tc′′.

Etymology. This specific name, hesperius  , is a Latin word meaning “western” and alludes to the State where the mites were collected.

Remarks. Palpipalpus hesperius  is unusual in the delayed expression of seta v ′ on tr II. This seta is normally expressed in the deutonymph, but in this species it does not appear until the adult. A similar ontogenetic delay occurs in the unrelated species Chaudhripalpus creelae  . This mite was red and found on the bark of its host.

Palpipalpus  is morphologically similar to Crossipalpus  but can be separated from it by the presence of dorsal setae f 2 (absent on Crossipalpus  ), and genua I –II with two setae (one seta on Crossipalpus  ).

Palpipalpus  is also morphologically similar to Phytoptipalpus  (most species) and Aegyptobia  in that they share a full compliment of setae on the dorsal shield. In addition, Palpipalpus  and Phytoptipalpus  both have two pairs of ps setae, while Aegyptobia  differs in having three pairs of ps setae. Palpipalpus  also differs in having the gnathosoma almost entirely covered by the prodorsum, seta 1 c is absent, and seta l' is absent on genua I –III.

WAM

Western Australian Museum

BRI

Queensland Herbarium

ANIC

Australian National Insect Collection

USNM

Smithsonian Institution, National Museum of Natural History