Dockovdia oruensis, Gledhill & Agbolade, 2006

Gledhill, Terence & Agbolade, Olufemi, 2006, A new species of water mite (Acari: Hydrachnidia: Hygrobatidae) from the mantle cavity of the prosobranch gastropod Potadoma moerchi (Reeve) (Streptoneura: Thiaridae) in Nigeria, Zootaxa 1160, pp. 37-47 : 39-42

Dockovdia oruensis sp. nov.

(Figures 1–19)

Material examined

Seven males, six females, dissected and mounted in glycerine jelly on microscope slides. Coll. Dr O.M. Agbolade from Potadoma moerchi collected in the Ojupon and Eri­ Oru streams, Oru, Ogun State, Nigeria, between December 2002 and September 2003. Holotype, male Prep. 1434, Allotype, female Prep . 1427. Paratypes, males Preps 1429, 1430, 1433, 1435, 1436 and 1438, females Preps 1426, 1428, 1431, 1432 and 1437.

Additional material

Paratypes, 25 undissected ovigerous females preserved in Koenike’s Solution , same data as above.

Diagnosis

With characters of the genus. Pedipalp with P­4 not strongly tapering distally, P­5 more than three times as high as long, cheliceral claw with only a fringe of short setae, common posterior margin of Cx1+2 not extending posteriorly.

The above combination of characters clearly separates Dockovdia oruensis from D. cookarum , the latter species having P­5 only as high as long and the cheliceral claws densely covered in long fine setae.

Description

MALE (Figs 1, 2, 4, 5, 6, 8, 9, 10, 11, 12, 15, 16 and 17). With characters of the genus. Idiosoma in dorsal and ventral views an elongated oval, length, excluding gnathosoma, 646 (537–683, 622, n=6), width 403 (366–439, 407, n=6). Dorsum unstructured, glandularia and associated setae small, and difficult to define but more­orless as illustrated in Fig. 2. Ventrally, (Fig. 1) with coxae in three groups in anterior half of idiosoma; Cx1 fused with capitulum; posterolateral margins of Cx1+2 extended laterally; common hind margin of Cx1+2 not, or only slightly, produced posteriorly; length Cx1+2, 180 (156198, 176, n=7); medial margins of Cx4 more­or­less straight and directed posterolaterally; suture lines between Cx3+4 complete; width across Cx4 at level of IV­ Legs, 336 (300342, 332, n=6); distance from posterior margin Cx1+2 to anterior margin of genital plate 240 (204264, 232, n=6). Genital acetabula on a common genital plate incorporating pre­and post­genital sclerites; three acetabula and four to six short, fine setae on each side of genital aperture (Figs 1, 4, 5 and 6; the latter figure shows genital acetabula on separate plates as in the female but smaller and the subcutaneous outline of the male ejaculatory complex); genital plate length 90 (6390, 81, n=6), genital plate width 81 (69–84, 78, n=7); distance from posterior margin of genital plate to posterior margin of idiosoma 159 (126–198, 162, n=6); excretory pore slit­like, close to posterior margin. Capitulum as in Figs 8 and 12 (lateral views), note that the ventral extensions are damaged fused areas of the capitulum and first coxae. Pedipalps ( Figs 8, 9, 10 and 11 ) stout; P­2 without ventral projections, with two pinnate setae on medial lateral face and a short dorsal seta at level of proximal lateral seta; P­3 with a single pinnate seta on medial lateral face; P­4 without pinnate setae but with up to three small, fine setae distally; P­5 somewhat rectangular, short, more than three times as high as long and with two long, stout, clawlike setae; dorsal lengths of pedipalp segments: P­1, 24 (18–24, 21, n=9); P­2, 81 (7284, 78, n=9); P­3, 51 (48–66, 56, n=10); P­4, 90 (78–90, 84, n=10); P­5, 15 (12–15, 13, n=10); pedipalp tarsal claw lengths, 48, 48, 48, 45 (39–48, 44, n=20). Chelicerae ( Figs 15 and 16 ) stout, length 213 (186–222, 205, n=6); cheliceral claws each with a row of short, fine setae; cheliceral claw length, 84 (75–84, 82, n=5). Legs similar to those of female but shorter (compare Figs 17 and 18 illustrating I­Leg of male and female respectively); I­ Leg.6 straight; claws of all legs each with two more­or­less equal teeth; dorsal lengths of leg segments, I­Leg.1­6: 36 (33–36, 35, n=7), 51 (42–51, 46, n=7), 78 (63–78, 70, n=7), 96 (87–96, 92, n=7), 108 (90–120, 103, n=6), 90 (75–90, 79, n=5); II­Leg.1–6: ­(33–39, 36, n=4), 57 (45–66, 54, n=7), 81 (63–81, 76, n=5), 105 (96–111, 102, n=6), 120 (105–129, 117, n=7), 99 (75–99, 86, n=7); III­Leg.1–6: 45 (36–45, 42, n=4), 57 (51–60, 56, n=6), 87 (78–87, 83, n=7), 123 (111–129, 118, n=8), 144 (129–147, 137, n=8), 99 (90–105, 96, n=8); IV­Leg.1–6: 87, 90 (75–90, 87, n=8), 87, 90 (78–90, 85, n=8), 120, 126 (111–126, 118, n=7), 156, 159 (144–171, 155, n=8), 171 (153–183, 165, n=5), 105 (102–111, 106, n=5).

FEMALE (Figs 3, 7, 13, 14, 18 and 19). Idiosoma larger, both longer and wider than that of male, length excluding gnathosoma, 1147 (964–1147, 1057, n=3), width 732 (695–817, 759, n=4). Dorsum as in male. Ventrally (Fig. 3) with coxae similar to those of male; length Cx1+2, 228 (198–240, 224, n=4); width across Cx4 at level of IV­Legs, 498 (456–540, 504, n=5); distance from posterior margin Cx1 to anterior margin of pregenital sclerite 324 (264–324, 289, n=4). Genital field as in Figs 3 and 7; genital field length 174 (174–225, 187, n=5), width 171 (171–195, 138, n=4); distance from posterior margin of postgenital sclerite to posterior margin of idiosoma 402 (300–402, 358, n=3). Excretory pore as in male. Pedipalps ( Figs 13 and 14 ) as in male but larger, dorsal lengths of pedipalp segments: P­1, 22, 24 (21–27, 23, n=8), P­2, 102, 90 (90–105, 95, n=10), P­3, 72, 84 (69–84, 76, n=10), P­4, 108, 108 (96–111, 103, n=11), P­5, 15, 15 (15–18, 17, n=11); pedipalp tarsal claw lengths, 54, 54, 51, 51 (45–54, 51, n=18). Chelicerae as in male (see Figs 15 and 16 ), length 312 (252–312, 280, n=9); cheliceral claw length 105 (105–114, 110, n=7). Legs ( Figs 18 and 19 ) with chaetotaxy similar to that of male, I­ Leg.6 not bowed. Dorsal lengths of leg segments, I­Leg.1–6: 45 (45, 45, n=1), 48 (45–48, 46, n=2), 87 (84–87, 86, n=2), 120 (111–120, 116, n=2), 120 (120–132, 126, n=3), 96, 120 (93–126, 108, n=6); II­Leg.1–6: 36 (36, 36, n=1), 57 (48–57, 52, n=2), 96 (96, 96, n=2), 135 (126–135, 130, n=2), 156 (153–156, 154, n=2), 105, 138 (99–138, 118, n=6); III­ Leg.1–6: 60 (60, 60, n=1), 66 (66, 66, n=2), 99 (93–105, 99, n=3), 150 (150–159, 154, n=4), 159 (159–183, 167, n=4), ­ (99–150, 123, n=4); IV­Leg.1–6: 105 (102–111, 106, n=3), 114 (105–114, 110, n=2), 129 (129–162, 145, n=5), 180 (180–219, 207, n=5), 231 (189–231, 217, n=3), 153 (141–165, 153, n=3).

Most females were ovigerous, each ovum was within a relatively thick­walled (19–48 m, mean 30 m, n=15) egg case (query = shell membrane sensu Sokolov, 1977), the diameter of which ranged from 124–152 m (mean 135 m, n=15). The diameter of each of the 15 ova measured in corpus was 104 m.

Etymology Dockovdia oruensis n.sp. is named for the town of Oru, Nigeria.

Designation of type locality

Unfortunately specimens collected from the Ojupon and Eri­Oru streams were combined. However, according to records held by the second author, Potadoma moerchi collected from the Eri­Oru produced more specimens of Dockovdia oruensis than did P. moerchi from the Ojupon. Accordingly the Eri­Oru stream is designated as the type locality.

Deposition of material The holotype and allotype of Dockovdia oruensis will be deposited in the Natural History Museum, London. Paratypes are retained in the collection of the first author.

Figures

FIGURES 8–12. Dockovdia oruensis sp. nov., 8, holotype, male Prep. 1434, infracapitulum with chelicera and left pedipalp. 9, holotype, male Prep. 1434, right pedipalp. 10, male Prep. 1436, left pedipalp with host tissue? attached to pedipalp tarsus ‘claws’. 11, male Prep. 1436, right predipalp. 12, male Prep. 1433, infracapitulum. Measurements in m.

FIGURES 13–16. Dockovdia oruensis sp. nov., 13, allotype, female Prep. 1427, left pedipalp. 14, allotype, female Prep. 1427, right pedipalp. 15, male Prep. 1433, chelicerae. 16, male Prep. 1438, chelicerae. Measurements in m.

FIGURES 17–19. Dockovdia oruensis sp. nov., 17, holotype, male Prep. 1434, I­Leg. 1–6. 18, allotype, female Prep. 1427, I­Leg. 1–6. 19, allotype, female Prep. 1427 IV­Leg. 1–6. Measurements in m.