The early derivative water mites (Acari: Hydrachnidia, superfamilies Eylaoidea, Hydrachnoidea and Hydryphantoidea) of Madagascar Gerecke, Reinhard Zootaxa 2020 2020-01-20 4727 1 1 77 Gerecke, 2020 Gerecke 2020 [151,634,1789,1816] Arachnida Teratothyadidae Teratothyas GBIF Animalia Trombidiformes 54 55 Arthropoda species porrigens sp. nov. Ascoteratothyas   Fig. 27a–b   Type series:  Holotype ♂, MNHN Ac1451, MD 118a,  21.10.2001 Maromandia( Majunga), left affl. of R Andranamalaza, ca. 1.0 km E from main road,  100 m, riffle, in liquid.  Paratypes: same site and date, (2/0/0) slide mounted, Ac1382; (1/0/0) in liquid, Ac1452; MD 031b,  18.08.2001 Madiorano( Fianarantsoa), stream crossing the railroad at km 51.2 (W tunnel 18),  650 m, pool, (0/1/1) slide mounted, Ac 1383; MD 037,  20.08.2001Andrambovato (Fian- arantsoa), large cascade 3 kmE from the village,  820 m, (0/1/0) slide mounted, Ac 1384; MD 200, Andringitra National Park( Fianarantsoa), affluent to Cascade de la Reinenear campsite,  1979 m, S 22°09’11.3’’, E 046°54’02.2’’,  12.04.2011(0/2/2) slide mounted, Ac 1386-1387.  Other material examined: MD 154b,   17.11.2001Joffreville ( M. d’Ambre, Antsiranana), R de Manquesin Reserve Fontenay,  550 m, roots, (1/0/0) slide mounted, Ac 1385.   Diagnosis:Membranous integument papillate. Genital field ( Fig. 27 b) with acetabula strongly enlarged (L Ac-1, 53–100, 32–44 % genital field L, Ac-2, 68–128, 44–55 %). Palp ( Fig. 27 a) longer than in other species of the subgenus (total L, P-4 L ♂♂, 234–268, 80–95; ♀♀, 296–352, 105–134), P-4 ventral margin in basal part straight.   Description:Membranous parts of integument with densely-arranged papillae. Genital field ( Fig. 27 b) with large acetabula (Ac-1 nearly as long as posterior medial plate margin, its posterior end on level of anterior end of Ac-2; L Ac-1, 53–100, 32–44 % genital field L, Ac-2, 68–128, 44–55 %). Genital flaps finely porose, with about 20 setae (longer and dense at anterior and posterior edges, finer and regularly-arranged along central medial margin) together forming a circle, anterolaterally with porose secondary sclerite, anteromedially concave, embracing the longish Ac-1. Plates posterolaterally embracing genital field with a strong, pore-free anterior margin. Leg claws with a very poorly developed, obtuse angled ventral blade. Gnathosoma ( Fig. 27 a) slender, ventral margin in proximal part straight, on the level of palp insertion forming an obtuse angle, distal part concave. Chelicera L/H 8.0–10.0. Palp stout, P-1 basally large, distally strongly narrowed, with one pennate dorsal seta; P-2 and -3 distally barely expanding, P-2 bearing three fine dorsal and two strong, pennate, distoventral setae, P-3 with one simple dorsal seta; P-4 relatively short, maximum H basally (here ventral margin straight or in the centre, bearing 4 fine, hair-like setae, one dorsally in the proximal half, three flanking P-5-insertion; P-5 slender, with little curved claws. Measurements: Male: Idiosoma L/W 830–1050/525–700; coxal field L/W 470–530/490–590; Cx-I+II L/W 470–530/490–590; Cx-III+IV L/W 275–330/180–210; genital field L/W 155–170/160–220; maximum diameter Ac-1, 53–70, Ac-2, 68–75 Ac-3, 53–70, ejaculatory complex L 180–68; gnathosoma L 215; chelicera total L 350– 352, L/H 9.8–10.0; basal segment/claw 1.23–1.29. Palp total L 234–268; L, L/H ratio, relative L [% total L] palp segments: P-1, 35–38, 0.93–1.15, 13–16; P-2, 48–60, 1.52–1.78, 20–22; P-3, 33–43, 1.08–1.13, 14–16; P-4, 80–95, 3.05–3.17, 34–36; P-5, 35–36, 2.2–2.9, 13–16; L ratio P-2/-3, 1.41–1.46, P-2/-4, 0.59–0.63, P-3/-4, 0.41–0.45. Leg segments L/H, L/H ratio: I-L-2, 85–105, 1.55–1.75; I-L-3, 95–103, 1.65–1.71; I-L-4, 145–163, 2.64–2.83; I-L-5, 150–170, 3.00–3.40; I-L-6, 145–175, 3.18–3.22; claw L 45–50. II-L-2, 95–105, 1.52–1.75; II-L-3, 70–105, 1.17– 1.83; II-L-4, 185–210, 3.36–3.82; II-L-5, 178–215, 3.23–3.91; II-L-6, 160–200, 3.50–3.64; claw L 40–45. III-L-2, 85–105, 1.55–2.00; III-L-3, 85–100, 1.70–1.90; III-L-4, 155–188, 3.10–3.75; III-L-5, 145–185, 3.22–3.70; III-L-6, 140–175, 2.95–3.18; claw L 50–53. IV-L-2, 100–125, 1.90–2.27; IV-L-3, 110–135, 2.10–2.45; IV-L-4, 215–258, 4.30–4.68; IV-L-5, 190–235, 4.22–5.22; IV-L-6, 175–215, 3.68–3.91; claw L 50–55. Total L segments 2–6: I-L, 620–715; II-L, 733-790; III-L, 610–753; IV-L, 790–968. Females: Idiosoma L/W 1250–1580/850–1120; coxal field L/W 600–840/680–1120; Cx-I+II L/W 350–380/243– 270; Cx-III+IV L/W 338–460/302–350; genital field L/W 83–100/240–270; maximum diameter Ac-1, 83–100, Ac- 2, 105–128, Ac-3, 78–86; gnathosoma L 315–380; chelicera total L 400–518, basal segment/claw 1.08–1.31, L/H 7.8–9.0; Palp total L 296–352; L, L/H ratio, relative L [% total L] palp segments: P-1, 43–47, 0.84–1.13, 13–15; P-2, 65–90, 1.64–2.10, 22–25; P-3, 40–43, 0.84–1.03, 12–14; P-4, 105–134, 3.00–3.83, 35–38; P-5, 38–40, 2.00–2.46, 11–14; L ratio P-2/-3, 1.58–2.11, P-2/-4, 0.62–0.67, P-3/-4, 0.32–0.39. Leg segments L/H, L/H ratio: I-L-2, 105– 140, 1.50–2.07; I-L-3, 115–140, 1.64–2.13; I-L-4, 185–234, 2.85–3.47; I-L-5, 200–252, 3.64–4.23; I-L-6, 180–225, 2.77–3.57; claw L 45–55. II-L-2, 125–180, 1.79–2.22; II–L–3, 120–176, 1.78–2.29; II-L-4, 235–315, 3.62–4.32; II-L-5, 230–320, 3.68–5.07; II-L-6, 180–225, 3.07–4.38; claw L 45–58. III-L-2, 105–149, 1.40–2.20; III-L-3, 115– 153, 1.53–2.27; III-L-4, 225–285, 3.33–4.00; III-L-5, 225–279, 3.91–4.77; III-L-6, 215–248, 3.44–3.67; claw L 54–60. IV-L-2, 135–194, 1.80–2.30; IV-L-3, 148–194, 2.03–2.53; IV-L-4, 290–359, 4.14–5.20; IV-L-5, 290–332, 4.46–5.62; IV-L-6, 250–320, 3.85–4.73; claw L 50–63. Total L segments 2–6: I-L, 785–995; II-L, 940–1242; III-L, 885–1103; IV-L, 1113–1382.   Derivatio nominis:  porrigens(Latin), extending–with reference to the protrusible gnathosomal tube.   Remarks:The species is similar to the typespecies of the subgenus,  T. levigata, in general size of the idiosoma and appendages and formation of the genital field (with large acetabula), but differs in the papillate, not smooth membranous integument. The Ac-2 are more strongly enlarged (% genital field L,  T. levigatain parentheses): ♂♂, 44–47 (41–42), ♀♀, 49–55 (43). In both sexes, this taxon shows a wide variability of many measurements, and remarkable differences are also found in the shape of P-4 (with maximum H in basal part, MD 037, in the centre of the segment, MD 118a). A male from the northern Montagne d’Ambre (MD 154) is provisionally attributed to  T. porrigens. It lies slightly outside the variability range given here, in having slightly shortened Ac-2 (38 % genital flap L), more elongate chelicerae (L/H 11.0) and a proportionally shorter P-4 (relative L 0.33, P-2/-4 ratio 0.71). Further research on the variability of the diverse populations could reveal that  T. porrigensis a mix of two or more species.  Habitat:Low and middle order streams, one uncertain record from (temporary?) puddles.   Distribution: Madagascar, endemic. Mostly in forests at middle and low elevation, but in the Andringitra Mountains at nearly 2000 ma.s.l. 2571579710 2001-10-21 100 Maromandia Ac 54 55 1 1 holotype 2556158308 2001-08-18 2011-12-04 2001-08-18 Cascade de la Reine Ac 650 55 56 -22.15314 Madiorano 1 46.90061 Ac 54 55 1 Fianarantsoa paratype 2556158317 2001-11-17 M. d'Ambre & R de Manques 550 Manques in Reserve Fontenay 55 56 1 Antsiranana