Compressalges nipponiae Dubinin, 1950

Waki, Tsukasa & Shimano, Satoshi, 2022, Redescription of two parasitic feather mites sampled from the last two Crested Ibises, Nipponia nippon (Temminck, 1835) (Pelecaniformes: Threskiornithidae) lived in Japan, Zootaxa 5116 (1), pp. 136-150 : 138-142

Compressalges nipponiae Dubinin, 1950

( Figs. 2–6 )

[Japanese name: Toki-umoudani]

Compressalges nipponiae Dubinin, 1950: 537–540 , fig. 1, 2; 1951: 29, fig. 16; 1956: 557–560, figs. 271–273; Gaud & Atyeo 1996: 79, fig. 216; Waki & Shimano 2020: 1–8, fig. 1; Kuroki et al. 2020, fig.1.

Material examined: 4 females and 4 males ( MPM Coll. No. 21820) from feathers of Nipponia nippon (Temminck, 1835) (Threskiornithidae) , JAPAN, Niigata Prefecture, Sado Island, Ministry of the Environment , Sado Japanese Crested Ibis Conservation Center, 21, August 1993 –4, October 1994, feather coll. Dr. Yoshinori Kaneko.

Description. FEMALE ( Figs. 2A–B , 4A–D , 5A–B , 6A–B, D ). Dorsal idiosoma. Gnathosoma: subcapitulum nearly square-shaped, length 97–126, greatest width 79–84. Body length including gnathosoma 506–558 long and 247–272 wide. Idiosoma 439–497 long, hysterosoma 349–377 long. Prodorsal shield strongly enlarged posteriorly, shaped as inverted mushroom, covering most part of prodorsum, anterior part with network pattern, posterior part with transverse striation, length 110–117, width of posterior part 117–124 ( Figs. 2B , 5A ). Setae ve rudimentary, situated on lateral margins of prodorsal shield, setae si and se near posterior margin of prodosal shield, setae se separated by 94–109. Hysteronotal shield enlarged in anterior part and gradually attenuate posteriorly, anterior margin with striations and shaped as trapezoid, close to prodorsal shield, length 329–374, greatest width 216–242, and surface with numerous small circular lacunae ( Figs. 2B , 5B ). Setae cp 153–187 long. Setae c2 thin spiculiform, 37–43 long. Setae c3 spiculiform, 34–39 long. Setae h3 spiculiform 78–94 long. Hysteronotal gland openings gl between levels of d2 and e2, cupules im between d2 and gl. Distances between setae and hysteronotal gland opening: se:se 87–92, si:si 51–55, d2: e2 56–76, d2:gl 31–44, e1:gl 63–75, h1: h1 23–29, h2:h2 57–63, h3:h3 45–52. Length of other dorsal setae: vi 8–11, se 94–109, c1 7–10, d1 9–13, d2 12–23, e1 13 –16, e2 11 –13, f2 17–22, h1 10–13, h2 210–252. Ventral idiosoma. Anus close to posterior margin of idiosoma. Oviporus shaped as an inverted Y, situated at level of sejugal furrow ( Fig. 2A , 6A ). Epigynum bow-shaped, 46–66 long and 41–62 wide. Cupules ih near lateral edges of opisthosoma at level of ps3. Length of ventral setae: 1a 38–56, 3a 49–52, 4a 47–57, 4b 20–28, ps2 10–11, ps3 9–13. Copulatory opening situated terminally, near posterior margin between setae ps1 ( Fig. 2A , 6B ). Legs ( Figs. 4A–D , Table 1 ). Length of tarsi, I–IV: 49–57, 46–54, 50–56, 58–69. Setation of legs I–IV: tarsi 8–7–6–6; tibiae 1–1–1–1; genua 2–2–0–0; femora 1–1–0–0; trochanters 1–1–1–0; coxae I–IV 1–0–1–0. Solenidiotaxy of legs I–IV: tarsi 2–1–0–0, tibiae I 1–1–1–1, genua 2–1–1–0. Famulus epsilon ɛ short spine-like ( Figs. 4A , 6D ), close to solenidion ω1; setae ba of tarsi I, II distant from bases of solenidia ω1.

MALE. ( Figs. 3A–B , 4E , 5C–D , 6C ). Dorsal idiosoma. Gnathosoma similar to that of female, length 88–101, width 66–83. Body length, including gnathosoma, 471–494, greatest width 230–253. Idiosoma length 400–442, hysterosoma length 316–329. Prodorsal shield as in female, length 103–111, width of posterior part 107–113. Setae si and se in posterior part of prodosal shield, setae se separated by 79–84. Hysteronotal shield strongly enlarged in anterior part and gradually attenuate posteriorly, anterior margin trapezoid-shaped, slightly concave in middle part, length 266–300, greatest width 186–212, surface with small circular lacunae in central area ( Fig. 5C ), and with large net-like ornamentation in posterior part ( Fig. 5D ). Setae c2 and c3 spiculiform. Opisthosomal lobes small, elongate, almost parallel-sided, length 42–47, greatest width 26–27. Terminal cleft U-shaped, greatest width 9–14. Outer margins of opisthosomal lobes with lateral membranes spreading from bases to posterior one third. Setae h1 narrowly lanceolate and situated on inner margins of opisthosomal lobes. Setae f2 spiculiform, situated near outer margins of opisthosomal lobes. Setae ps2 narrowly lanceolate, situated on lateral margins of opisthosomal lobes. Macrosetae h2 and h3 situated on posterolateral angles of opisthosomal lobes. Setae ps1 wide fan-shaped with radial striation, situated on terminus of opisthosomal lobes. Cupules im and hysteronotal gland openings gl between d2 and e2. Distances between setae and hysteronotal gland opening: se:se 79–86, si:si 46–54, d2: e2 77–94, d2:gl 59–76, e1: gl 30–38, h1:h1 11–15, h2:h2 60–68 h3:h3 45–52. Length of dorsal setae: vi 5–9, si 4–7, se 39–49, cp 141–205, c1 5–8, c2 28–38, c3 25–33, d1 5–8, d2 6–8, e1 4 –7, e2 6, f2 18–25, h1 22–25, h2 197–241, h3 183–229. Ventral idiosoma. Genital apparatus between trochanters IV, flanked laterally with setae g and ps3. Setae ps3 occasionally duplicated, additional pair smaller and situated anterior to original ps3 ( Fig. 6C ). Genital papillae posterior to setae 4a. Aedeagus stylet-like, 30–34 in length. Adanal suckers barrel-shaped, retracted in opisthosoma, 20–24 in length and 16–25 in width. Anus near anterior end of terminal cleft. Epimerites IVa long; adanal apodemes well developed, situated immediately posterior and parallel to epimerites IVa. Cupules ih near posterior ends of opisthosomal lobes. Length of ventral setae: 1a 32–39, 3a 31–42, 4a 28–38, 4b 23–28, ps1 31–34, ps2 23–29, ps3 13–17, g 21–27. Legs ( Fig. 4E , Table 1 ): Legs IV hypertrophied. Length of tarsi I–IV: 46–51, 42–49, 45–50, 67–70. Leg setation as in female. Seta e of tarsus IV filiform, seta d small spiculiform and situated at level of distal 1/4 of this segment.

Remarks. In the original description of Compressalges nipponiae and in the subsequent work, Dubinin (1950, 1956) erroneously interpreted the hysteronotal glands, which are dark-colored and have longitudinal striation, as some ventral setae modified in “large funnel-shaped suckers”. Gaud & Atyeo (1996) provided correct illustrations of this mite, but their drawing were too small-sized and did not show some tiny details of the genital apparatus, adanal suckers and opisthosoma of male.

Figures

FIGURE 2. Compressalges nipponiae Dubinin, 1950, female.A—ventral view, B—dorsal view.

FIGURE 3. Compressalges nipponiae Dubinin, 1950, male. A—ventral view, B—dorsal view.

FIGURE 4. Compressalges nipponiae Dubinin, 1950, legs. A, B—legs I—II of female, antiaxial face, C, D—legs III, IV of female, paraxial face, E—leg IV of male, paraxial face.

FIGURE 5. Compressalges nipponiae Dubinin, 1950, dorsal shields (SEM photos). A—prodorsal shield of female, B—hysteronotal shield of female, C—hysteronotal shield of male, D—posterior end of male hysteronotal shield.

FIGURE 6. Compressalges nipponiae Dubinin, 1950, details (SEM photos). A—oviporus of female, B—anal area and copulatory opening (arrowhead) of female, C—genital apparatus of male and surrounding setae (arrowhead: irregularly duplicated seta ps3), E—left tarsus I in dorsal view.