Meyeraepalpus delfinadae Smiley, Frost and Gerson, 1996,

Beard, Jennifer J., Seeman, Owen D. & Bauchan, Gary R., 2014, Tenuipalpidae (Acari: Trombidiformes) from Casuarinaceae (Fagales), Zootaxa 3778 (1), pp. 1-157: 69-80

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

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Meyeraepalpus delfinadae Smiley, Frost and Gerson, 1996
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Meyeraepalpus delfinadae Smiley, Frost and Gerson, 1996 

( Figs 54–66View FIGURE 54View FIGURE 55View FIGURE 56View FIGURE 57View FIGURE 58View FIGURE 59View FIGURE 60View FIGURE 61View FIGURE 62View FIGURE 63View FIGURE 64View FIGURE 65View FIGURE 66)

Meyeraepalpus delfinadae Smiley, Frost and Gerson, 1996: 178  , figs. 22–25. Aegyptobia delfinadae, Mesa et al. (2009)  : 13.

Type material examined. Holotype female ex. Slaty She-Oak Allocasuarina muelleriana  ( Casuarinaceae  ) [feeding on bark of branchlets], AUSTRALIA: South Australia, Flinders Ranges, St Mary’s Peak, at 750 m, 0 3 October 1995, coll. W. E. Frost ( WINC). Paratypes. 2 females, same data as holotype ( WINC; 1 slide, with 1 Crossipalpus muellerianae  deutonymph); 1 male, same data as holotype ( WINC; same slide as holotype).

Non-type material examined. 8 females, 2 pharate females, 1 male, 5 deutonymphs, 3 protonymphs, 1 pharate protonymph, 1 larva, ex. Allocasuarina muelleriana  , AUSTRALIA: South Australia, Adelaide, Athelston, Maryvale Road, Wadmore Park, 34 ° 52 ’ 49 ” S 138 ° 42 ’ 10 ” E, 21 April 2009, coll. J.J. Beard and C.J. Burwell (QM; USNM).

Diagnosis. All dorsal setae broadly lanceolate, barbed. Both dorsal shields with weak rugose sculpturing. Gnathosoma partially concealed by prodorsum. Anterior margin of prodorsum with fleshy triangular lobes, within deep anterior prodorsal concavity, anterior to setae v 2. Palp setal formula 0, 0, 0, 2, 3 (1). Setae ps 1–3 narrow, smooth. Coxae I –IV 2 - 2 - 1 - 1 (1 c present on cx I); trochanters I –IV 1 - 1 -2- 1 (seta v ′ present on tr I –IV; l ′ present on tr III); femora I –IV 3 - 3 - 1 - 1 (d absent on fe III); genua I –IV 3 - 3 - 1 -0 (l ′ and l ′′ present on ge I –II; l ′ present on ge III; ge IV nude); tarsi I –IV 9 (1)- 9 (1)- 5 - 5 (tc ′′ present ta I –IV). Empodia claw-like. Spermathecal tube narrow, ca. 110 long. Spermathecal vesicle elongate, 2–4 wide, 10 long. Male with swollen solenidia on palps and tarsus I –II.

FEMALE (n = 11). Dorsum. ( Figs 54View FIGURE 54, 55View FIGURE 55 a, 56, 57 a) Body measurements: distance between setae v 2 -h 1 265– 300 [290]; sc 2 -sc 2 140–170 [145]; other measurements: v 2 -v 2 31–44 [31], sc 1 -sc 1 115–135 [115], c 1 -c 1 30–42 [42], c 2 -c 2 140–175 [145], c 3 -c 3 185–235 [195], d 1 -d 1 18–31 [28], d 2 -d 2 135–165 [140], d 3 -d 3 170–205 [170], e 1 - e 1 18–27 [18], e 2 -e 2 130–145 [130], e 3 -e 3 125–155 [140], f 2 -f 2 91–110 [94], f 3 -f 3 96–105 [105], h 1 -h 1 22–31 [31], h 2 -h 2 58–75 [68]. Gnathosoma partially concealed beneath anterior margin of prodorsum ( Fig. 56View FIGURE 56). Anterior margin of prodorsum with medial notch anterior and ventral to setae v 2 (internal depth 14–22 [17]), forming 1 pair of three-dimensional triangular lobes originating from within apparent depression; anterior notch often appearing slightly withdrawn into prodorsum when anterior margin of prodorsum collapsing and/or folds on itself anterior to setae v 2 ( Figs 56View FIGURE 56, 57View FIGURE 57 a). Prodorsal and opisthosomal shields weakly developed with sparse rugose sculpturing. Lateral cuticle surrounding shields with few irregular striae. All dorsal setae short, broadly lanceolate,

barbed. Setal lengths: v 2 18–21 [19], sc 1 14–22 [17], sc 2 14–19 [17], c 1 17–23 [23], c 2 13–19 [19], c 3 13–17 [15], d 1 18–21 [20, 21], d 2 15–20 [16], d 3 14–22 [16, 18], e 1 15 –21 [19], e 2 13 –17 [13, 17], e 3 16 –20 [18, 19], f 2 15–18 [18], f 3 17–27 [20], h 1 14–17 [16], h 2 17–22 [21, 22]. Palps. ( Fig. 56View FIGURE 56) Setal formula 0, 0, 0, 2, 3 (1 s+ 2 e). Tibial setae, dorsal 7–10 [8] long, ventral 9–12 [10] long; tarsal eupathidia 5–6 [6], 7–8 [8] long; solenidion 5–6 [6] long. Venter. ( Fig. 58View FIGURE 58 a, b) Cuticle with fine longitudinal striae between 1 a - 1 a; broadly separated transverse striae between 1 a - 3 a; weak fine transverse striae 3 a - 4 a; striae posterior to 4 a fine transverse becoming oblique to longitudinal towards ag; ag -ag with mixed striae; broadly separated longitudinal striae surrounding genital flap; few weak longitudinal to oblique striae on genital flap. Genital setae inserted in more-or-less transverse row on genital flap. Anal setae ps 1–3 fine, inserted along medial margin of anal plates in more-or-less longitudinal line. Coxal, genital and anal setae fine. Setal lengths: 1a 55 – 70 [64], 1 b 18–33 [31], 1 c 15–25 [25], 2 b 20–31 [27], 2 c 19–31 [24], 3a 46 – 77 [72], 3 b 20–28 [24], 4a 45 – 64 [63], 4 b 21–30 [25], ag 20–26 [23], g 1 22–28 [24], g 2 18–27 [23], ps 1 12–17 [15], ps 2 12–15 [14], ps 3 10–17 [13]. Spermatheca. ( Fig. 58View FIGURE 58 c) Spermathecal tube narrow, ca. 110 long. Spermatheca elongate, 10 long, 2 wide basally and expanding to 3–4 wide. Genital opening between setae ps 3. Not always clearly visible. Legs. ( Fig. 59View FIGURE 59) Setal formula for legs I –IV (coxae to tarsi) 2 - 1-3 - 3-4 - 9 (1), 2 - 1-3 - 3- 4 - 9 (1), 1-2 - 1 - 1-3 - 5, 1 - 1 - 1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (ta I 6–9 [8, 9] long, ta II 6–8 [8] long) and 2 eupathidia pζ'-pζ" (ta I 7–9 [8, 9] long; ta II 6–8 [7] long). Leg setation as in Table 1 except femora III without seta d. Setae v' added to tr IV.

MALE (n = 2). Dorsum. ( Fig. 55View FIGURE 55 b) Body measurements: distance between setae v 2 -h 1 210–215, sc 2 -sc 2 115– 125; other measurements: v 2 -v 2 25–30, sc 1 -sc 1 93–94, c 1 -c 1 28–29, c 2 -c 2 106–110, c 3 -c 3 136–152, d 1 -d 1 18–19, d 2 -d 2 92–97, d 3 -d 3 107–113, e 1 - e 1 15–17, e 2 - e 2 82–87, e 3 - e 3 92–97, f 2 -f 2 63–64, f 3 -f 3 72–74, h 1 -h 1 12, h 2 -h 2 41–43. Gnathosoma not concealed beneath anterior margin of prodorsum ( Fig. 61View FIGURE 61). Anterior margin of prodorsum similar to female, with medial notch anterior to setae v 2 (internal depth 9–11) ( Figs 57View FIGURE 57 b, 61). Prodorsal, mesonotal and pygidial shields weakly wrinkled and finely pitted; setae c 1–2 and d 1–2 inserted on paired mesonotal shields; setae e 1, e 3, f 2–3, h 1–2 inserted on pygidial shield. Setal lengths: v 2 17, sc 1 15, sc 2 14, c 1 17, c 2 14, c 3 15, d 1 15, d 2 14, d 3 14, e 1 15, e 2 15, e 3 16, f 2 13, f 3 17, h 1 12, h 2 17. Palps. ( Figs 60View FIGURE 60 a, 61) Palps similar to female. Tibial setae, dorsal 10–11 long, ventral 8–9 long; tarsal eupathidia 7, 7–8 long; solenidion significantly

swollen 8–9 long ( Fig. 61View FIGURE 61). Venter. ( Fig. 60View FIGURE 60 b) Cuticle with fine longitudinal striae between 1 a - 1 a; broadly separated transverse striae between 1 a - 3 a; weak fine transverse striae 3 a - 4 a; broadly separated transverse striae and folds between 4 a and posterior margin of body. Coxal setae fine and finely barbed. Setae ag 1, g 1, g 2, ps 2, ps 3 fine; setae ps 1 modified to form thick spines ( Fig. 60View FIGURE 60 b). Setal lengths: 1a 59 – 66, 1 b 26–30, 2 b 25–29, 2 c 21–24, 3 a 43–61, 3 b 23–26, 4 a 40–49, 4 b 24–28, ag 1 17–19, g 1 15–18, g 2 17–18, ps 1 13–15, ps 2 11–14, ps 3 13–15. Aedeagus. ( Fig. 60View FIGURE 60 c) Narrow, sclerotised, tapering to a blunt point, 60–61 long. Legs. ( Figs 62View FIGURE 62, 63View FIGURE 63) Setal formula same as female. Tarsi I and II each with 1 antiaxial solenidion ω", significantly swollen (ta I 12–14 long; ta II 8–12 long) and 2 eupathidia pζ'-pζ" (7–8 long). Solenidia significantly broader and longer than those of female ( Fig. 63View FIGURE 63).

DEUTONYMPH (n = 5). Dorsum. ( Figs 57View FIGURE 57 c, 64) Body measurements: distance between setae v 2 -h 1 260–275, sc 2 -sc 2 120; other measurements: v 2 -v 2 34, sc 1 -sc 1 109, c 1 -c 1 26–28, c 2 -c 2 122, c 3 -c 3 150, d 1 -d 1 21, d 2 -d 2 108– 110, d 3 -d 3 150–165, e 1 - e 1 18–20, e 2 -e 2 100–102, e 3 - e 3 90–100, f 2 -f 2 80–95, f 3 -f 3 66–67, h 1 -h 1 19–20, h 2 -h 2 41–50. Anterior margin of prodorsal shield without notch ( Fig. 57View FIGURE 57 c). Prodorsal shield smooth with few irregular creases. Opisthosoma with irregular transverse striae and some patches of smooth cuticle, including setae c 1. Lateral cuticle smooth with weak irregular striae. Dorsal setae broadly lanceolate, except narrowly lanceolate setae f 3 and h 2. Setal lengths: v 2 17–19, sc 1 14–15, sc 2 13–14, c 1 17–18, c 2 12–17, c 3 11, d 1 16–17, d 2 12–14, d 3 15– 17, e 1 15, e 2 11 –13, e 3 14 –16, f 2 11, f 3 19, h 1 9–10, h 2 15–20. Palps. Palps similar to adult. Tibial setae, dorsal 6– 7 long, ventral 8–9 long; tarsal eupathidia 4–5, 5 – 6 long, solenidion 3–4 long. Venter. Cuticle with fine transverse striae to anterior of ag, longitudinal striae becoming coarse around anal region. Coxal, genital and anal setae fine. Setal lengths: 1a 40 – 48, 1 b 16–20, 2 b 14–19, 2 c 18–20, 3 a 30–40, 3 b 15–17, 4 a 25–28, 4 b 14–17, ag 1 15, g 1 16, ps 1 8, ps 2 8–10, ps 3 8. Legs. Setal formula for legs I –IV (coxae to tarsi) 2 - 1-3 - 3-4 - 9 (1), 2 - 1-3 - 3-4 - 9 (1), 1-2 - 1 - 1-3 - 5, 1 - 0-1 - 0-3 - 5. Tarsi I and II each with 1 antiaxial solenidion ω" (4 long) and 2 eupathidia pζ'-pζ" (6–7, 6 long). Leg setation as in adult except: tr IV without seta v ′. Setae v' added to tr I –III.

PROTONYMPH (n = 3). Dorsum. Body measurements: distance between setae v 2 -h 1 195, sc 2 -sc 2 100; other measurements: v 2 -v 2 30, sc 1 -sc 1 89, c 1 -c 1 23, c 2 -c 2 104, c 3 -c 3 140, d 1 -d 1 16, d 2 -d 2 93, d 3 -d 3 130, e 1 - e 1 16, e 2 - e 2 83, e 3 - e 3 80, f 2 -f 2 60, f 3 -f 3 40, h 1 -h 1 11, h 2 -h 2 23. Anterior margin of prodorsal shield without notch. Prodorsal shield smooth with few irregular creases. Opisthosoma with irregular transverse striae. Lateral cuticle smooth with weak irregular striae. Dorsal setae broadly lanceolate. Setal lengths: v 2 15, sc 1 11, sc 2 12, c 1 16, c 2 9, c 3 13, d 1 11, d 2 12, d 3 12, e 1 11, e 2 8, e 3 11, f 2 10, f 3 19, h 1 7, h 2 17. Palps. Palps similar to adult. Tibial setae about 5 long; tarsal eupathidia 4, 5 long, solenidion 3 long. Venter. Striation same as deutonymph. Coxal, genital and anal setae fine. Setal lengths: 1a 40, 1 b 15, 1 c 12, 2 b 14, 3a 40, 3 b 13, ag 1 7, ps 1 6, ps 2 4, ps 3 3. Legs. Setal formula for legs I –IV (coxae to tarsi) 2 - 0-3 - 1-4 - 9 (1), 1 - 0-3 - 1-4 - 9 (1), 1 - 1 - 1 - 1-3 - 5, 0- 0-1 - 0-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (3 long) and 2 eupathidia pζ'-pζ" (ta I 4–5, 4 long; ta II both 4 long). Leg setation as in deutonymph except: seta 2 c absent; seta 4 b absent; tr I –III without v ′; ge I –II without setae l ′ and d; ta IV without setae tc ′, tc′′. Setae l' added to tr III.

LARVA (n = 1). Dorsum. ( Fig. 65View FIGURE 65) Body measurements: distance between setae v 2 -h 1 165, sc 2 -sc 2 91; other measurements: v 2 -v 2 29, sc 1 -sc 1 74, c 1 -c 1 21, c 2 -c 2 88, c 3 -c 3 125, d 1 -d 1 15, d 2 -d 2 74, d 3 -d 3 93, e 1 - e 1 15, e 2 - e 2 67, e 3 - e 3 63, f 2 -f 2 45, f 3 -f 3 44, h 1 -h 1 9, h 2 -h 2 24. Anterior margin of prodorsal shield without notch. Prodorsal shield smooth with few irregular creases. Opisthosoma with few irregular striae, especially mid-dorsally. Setal lengths: v 2 12–13, sc 1 12–13, sc 2 14–15, c 1 15, c 2 13–15, c 3 10–13, d 1 10–11, d 2 12–13, d 3 12–14, e 1 6 –7, e 2 13 –15, e 3 15, f 2 13–15, f 3 14–17, h 1 8–11, h 2 15–16. Dorsal setae lanceolate except setae f 2 -f 3, h 1 -h 2 thickened, barbed. Palps. Palps similar to adult. Tibial setae, dorsal 5 long, ventral 6 long; tarsal eupathidia 5, 6 long, solenidion 3 long. Venter. Striation same as deutonymph. Coxal and anal setae fine. Setal lengths: 1 a ca. 30, 1 b 11, 3 a ca. 25, ps 1 5, ps 2 3, ps 3 5. Legs. ( Fig. 65View FIGURE 65) Setal formula for legs I –III (coxae to tarsi) 1 - 0-3 - 1-4 - 7 (1), 0- 0-3 - 1-4 - 7 (1), 0- 0-1 - 1-3 - 3. Tarsi I and II each with 1 antiaxial solenidion ω" (2 long) and 2 eupathidia pζ'-pζ" (3 long). Leg setation as in protonymph, except: seta 2 b absent; seta 3 b absent; tr III without l ′; ta I –III without setae tc ′, tc′′.

Remarks. Specimens for this redescription were collected from the type host in the type locality. Individuals were collected from fine branches of the host ( Fig. 66View FIGURE 66).

We are resurrecting the original generic placement of this species, Meyeraepalpus delfinadae  , despite its recent placement within Aegyptobia  by Mesa et al. (2009). This species would be unusual among Aegyptobia  as it would be the only species we know that lacks seta d on femur III ( Seeman & Beard 2011), has the gnathosoma partially concealed by the prodorsum, prodorsal lobes in a deep anterior concavity, and has a male with greatly swollen solenidia. The loss of seta d on femur III is unique among all species studied here, but the male with swollen solenidia also occurs in Crossipalpus  , Magdalenapalpus  and Palpipalpus  . The concealed gnathosoma occurs in other tegopalpine mites, being partially concealed in Magdalenapalpus  and Palpipalpus  , and completely concealed in Australopalpus  , Chaudhripalpus  , Crossipalpus  , Philippipalpus  and Tegopalpus  . Meyeraepalpus delfinadae  also has two coxal setae, i.e. seta both 1 b and 1 c are present, and while this is unique for tegopalpine species, it is common for Aegyptobia ( Seeman & Beard 2011)  .

Meyeraepalpus delfinadae  is substantially different to the three genera with which it shares the character of swollen solenidion in the male, i.e., Crossipalpus  , Magdalenapalpus  and Palpipalpus  . Meyeraepalpus delfinadae  is different to Crossipalpus  , which has four palpal segments, no prodorsal projections of any type, seta f 2 absent, no seta 1 c, two pairs of pseudanal (ps) setae, genual setal counts of 1 - 1 -0-0, and its gnathosoma is completely concealed by the prodorsum; and is different to Palpipalpus  which has a pair of rounded prodorsal lobes anterior to v 2, two pairs of ps setae, coxae without 1 c, and genua with 2 - 2 -0-0. Meyeraepalpus delfinadae  bears a greater resemblance to the third genus, Magdalenapalpus  (especially Ma. strandtmanni  , with setae f 2 present), where it was originally placed by Smiley et al. (1996). Mesa et al. (2009) moved the species to Aegyptobia  because it “has a rostral shield and the anterior margin of the prodorsum is not invaginated”. However, adult Me. delfinadae  do indeed have an invaginated anterior margin, formed by distinct lobes on the anterior margin of the prodorsum, that are often slightly retracted into the prodorsum, forming a shallow cavity anteroventral to setae v 2 ( Figs 56View FIGURE 56, 57View FIGURE 57 a, b). These lobes are not present on the immature life stages ( Fig. 57View FIGURE 57 c). The anterior lobes of Me. delfinadae  are unlike any other found in Aegyptobia  , which are formed by a simple notch in the prodorsal shield (e.g. Fig. 124 a) or a forked extension of the prodorsal shield (e.g. Aegyptobia bromi Khanjani et al., 2012 a  ). Likewise the lobes on Meyeraepalpus delfinadae  do not appear homologous with those of Magdalenapalpus  ( Figs 42View FIGURE 42, 43View FIGURE 43), but instead, they appear similar to those of Chaudhripalpus  ( Figs 1View FIGURE 1, 2View FIGURE 2, 8View FIGURE 8 a) and Tegopalpus  ( Fig. 107View FIGURE 107 a, 108, 110 a, b, 111 a), which originate from below the level of the dorsal surface of the prodorsum. Furthermore, Me. delfinadae  does not share the same leg setation with species of Magdalenapalpus  which all lack seta 1 c on cx I, v ′ on tr I –IV, l ′ and l′′ on ge I –III, and tc′′ on ta I –IV, all of which are present in Me. delfinadae  .

It is for the above mentioned differences, and not those listed by Mesa et al. (2009) that we exclude Me. delfinadae  from Aegyptobia  and Magdalenapalpus  . Further evidence is presented in our cladistic analysis, which places Me. delfinadae  as a unique species and sister group to all other tegopalpine mites.

WINC

Waite Insect and Nematode Collection

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Prostigmata

Family

Tenuipalpidae

Genus

Meyeraepalpus

Loc

Meyeraepalpus delfinadae Smiley, Frost and Gerson, 1996

Beard, Jennifer J., Seeman, Owen D. & Bauchan, Gary R. 2014
2014
Loc

Meyeraepalpus delfinadae

Smiley 1996: 178
Mesa et al. (2009)
1996