Pterygosoma serrata Jack, 1962

Fajfer, Monika, 2020, A systematic revision of the scale mite genus Pterygosoma Peters, 1849 (Acariformes: Pterygosomatidae), Zootaxa 4805 (1), pp. 1-147 : 127-128

Pterygosoma serrata Jack, 1962 ( Figs 118–121 )

Pterygosoma serrata Jack, 1962: 585 , fig. 5

Type host: Agama rueppelli occidentalis (Sauria: Agamidae ). Type locality: Kenya (Rift Valley Province).

Redescription. FEMALE (based on lectotype and 6 paralectotypes from Agama rueppelli occidentalis and 2 non-type specimens of A. r. rueppelli ). Gnathosoma . Chelicerae 200–275 long; swollen cheliceral part 95–105 long, slender distal part 105–160 long. Fixed cheliceral digit with minute tines, 15–20 long. Setae dF and dG, 65–80 and 50–60 long, respectively. Palpal tibia with small claw. Palpal tarsi with 3 setae. Subcapitulum with filiform setae n, 25–30 long. Peritremes about 100 long. Hypostome with smooth rounded apex. Idiosoma 605–685 long and 1265–1430 wide. Dorsum. Antero-lateral part with about 120 pairs of serrate setae, 40–135 long; medial part with 2 pairs of dorso-median setae dm1 and dm2. Setae dm1 serrate, 25–35 long, setae dm2 slightly serrate and apically expanded, 50–70 long. Peripheral setae represented by 52–63 pairs of slightly serrate fine-pointed, tapered or apically expanded setae, 190–285 long. These setae form dense cluster near genital region, arranged in several rows: dorsal, ventral and terminal in position. Eyes absent. Venter with 3 pairs of ventro-median setae: vm1 filiform, vm2 and vm3 slightly serrate. Genital slit situated mainly dorsally. Genital series represented by 3 pairs of slightly serrate setae g1–g3, 55–70 long. Pseudanal series represented by 4 or 5 pairs of slightly serrate setae ps1–ps5, 75–100 long, situated dorsally. Legs chaetotaxy as in inermis group i.e. setae of trochanters I–IV (1–1–1–1), femora I–IV (3–1–1–1), genua I–IV (2–0–0–1), tibiae I–IV (5–3–3–3). All setae on each podomere filiform, except for serrate setae dFI–IV. Setation of tarsi I−IV as in group A: I 13 setae (ft, tc’, tc”, p’, p”, a’, a”, it’, it”, u’, u”, vs’, vs”) and solenidion ω1; II 8 setae (tc’, p’, p”, a’, a”, u’, u”, vs’) and ω1; III and IV with 8 setae each (tc’, p’, p”, a’, a”, u’, u”, vs’). Setae tc’ of legs II–IV and a’, a”, u’, u” of legs I–IV smooth, vs’ and vs” smooth except for slightly serrate setae vs’ of legs IV.

MALE (based on 4 specimens from Agama rueppelli occidentalis and 2 non-type specimens of A. r. rueppelli ). Gnathosoma as in female. Chelicerae 95–100 long; swollen cheliceral part 50–55 long, slender distal part 45 long. Fixed cheliceral digit 10–15 long. Hypostome 75–80 long. Peritremes about 75 long. Subcapitular setae n 10–15 long. Setae dF thick and slightly serrate at tip, 15 long. Setae dG filiform, 20 long. Idiosoma 295–350 long and 600–670 wide. Dorsum with 3 groups of serrate setae: 25–37 pairs of antero-lateral setae, 25–85 long; 2 pairs of dorso-median setae dm1 and dm2, 40–45 long, and 4–12 pairs of slightly serrate peripheral setae, 160–230 long. Eyes present. Aedeagus about 65–75 long. Genito-anal opening with 1 pair of filiform setae, 15–30 long, and 2 pairs of inconspicuous setae, about 5 long. Venter. Setae vm1 filiform, setae vm2 and vm3 serrate. Legs as in female.

DEUTONYMPH (based on description presented in Jack 1962a, amended). Gnathosoma as in female. Idiosoma 420 long and 775 wide. Dorsum with about 40 pairs of serrate setae, 20–30 long, situated antero-laterally; 2 pairs of slightly serrate dorso-median setae dm1 and dm2: 20 and 35 long, respectively, and about 40 pairs of slightly serrate peripheral setae, 65–110 long. Eyes present. Venter as in female. Genital slit situated terminally. Genital series represented by 3 pairs genital setae. Pseudanal series represented by 4 pairs of setae ps1–ps4, 35–70 long. Setae ps1 and ps2 situated dorsally, setae ps3 and ps4 ventrally. Legs as in female.

NYMPH CHRYSALIS (based on 1 nymph chrysalis from Agama rueppelli rueppelli ). Margins of gnathosoma and peritremes barely discernible. Idiosoma 880 wide and 480 long. Dorsum with 24 pairs of slightly serrate anterolateral setae, 15–45 long, and 40 pairs of peripheral setae, 100–190 long. Genital slit situated terminally. Pseudanal series with 4 and 5 pairs of setae ps on each side present.

LARVA (based on description presented in Jack 1962a, amended). Gnathosoma as in female. Chelicerae about 70 long; swollen cheliceral part about 40 long, slender cheliceral part about 30 long. Idiosoma 185 long and 185 wide. Dorsum with about 13 pairs of slightly serrate setae, 20–30 long, arranged as in Fig. 32A . Eyes present. Genital setae absent. Pseuadanal series represented by 2 pairs of pseudanal setae ps1 and ps2, 5–10 long. Legs I–III as in female.

Type material (examined). One female lectotype and 5 female paralectotypes ( NHM no. 1966.2.22.166–175) from Agama rueppelli occidentalis Parker ( NHM no. 1935.12.1.112–117), KENYA: Rift Valley Province , 1934, coll. Fusch.

Non-type material (examined). Two female, 2 male and 1 nymph chrysalis ( NHM no. 1966.2.22.176–185) from Agama rueppelli rueppelli Vaillant and Revoil (Sauria: Agamidae ) ( NHM no. 1935.12.1.112–117), SOMA- LIA: Borama District 42°40’E 10°35’N, 21 November 1933, coll. R. H. Taylor; 3 males ( NHM no. 1966.2.22.166– 175) from Agama rueppelli occidentalis Parker ( NHM no. 1935.12.1.112–117), KENYA: Rift Valley Province, 1934, coll. Fusch; 1 male ( NHM no. 1966.2.22.166–175) from same host species ( NHM no.1935.12.1.112–118) and location, 1934, coll. Fusch.

Type material deposition. All type material deposited in the NHM .

Hosts and distributions. This species is known from Agama rueppelli occidentalis from Kenya [Rift Valley Province] and Agama rueppelli rueppelli from Somalia [Borama District] ( Jack 1962b).

Remarks. This study shows that in females setae dF are longer than dG and setae v”GI are absent vs. setae dF and dG are subequal in length and setae v”GI are present according to the original description ( Jack 1962b). Furthermore, in males two additional inconspicuous setae are present on the genital cone (vs. lack of these setae in the original description).

Figures

FIGURE 32. Pterygosoma parasiniatum Fajfer, Melnikov and Dabert, 2016, larva. A, dorsal view; B, ventral view; C, gnathosoma in dorsal view (after Fajfer et al. 2016).

FIGURE 118. Pterygosoma serrata Jack, 1962, female. A, dorsal view; B, anterior dorsal seta.

FIGURE 119. Pterygosoma serrata Jack, 1962, female, A, ventral view; B, types of peripheral setae.

FIGURE 120. Pterygosoma serrata Jack, 1962, male, A, dorsal view; B, ventral view.

FIGURE 121. Pterygosoma serrata Jack, 1962, nymph chrysalis in dorsal view.