Djeboa angulipalpis Pesic, Cook & Gerecke, sp. nov.
Creators: name: Pešić, Vladimir
name: Cook, David
name: Gerecke, Reinhard
name: Smit, Harry
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Mideopsidae
Djeboa
Djeboa angulipalpis

description: Djeboa angulipalpis Pešić, Cook & Gerecke sp. nov.
(Figs. 5A–E, 6A–B, 37I –J)
Type series: Holotype male, dissected and slide mounted, Madagascar 125d, Ambohitsara (Antalaha, Antsiranana), R. Ankavia upstr. the village, 25 m asl., 28.0 ˚C, 0.0111 mS/cm, pool, 27.x.2001, Gerecke & Goldschmidt. Paratypes: same data as holotype 0/1/0 (dissected and slide mounted); Madagascar 125b, same data as holotype 1/0/0 (dissected and slide mounted); Madagascar 0 61, Tsimelahy (Tulear), 200 m asl., 21.0 (surface 25.8) ˚C, 0.220 mS/cm, 05.ix.2001, Gerecke & Goldschmidt 1/2/0 (dissected and slide mounted).
Further records: Madagascar 060c Tsimelahy (Tulear), River Antarantsa, downstream ‘piscine naturelle’, 200 m asl., 21.5 ˚C, 0.225 mS/cm, pool, 05.ix.2001, Gerecke & Goldschmidt 0/1/0 (mounted); Madagascar 127a, Ambohitsara (Antalaha, Antsiranana), left affl. R. Ankavia NE M.Ambohifalontsy, 100 m asl., 26.7 ˚C, 0.022 mS/ cm, riffle, 29.x.2001, Gerecke & Goldschmidt 0/1/0 (mounted); Madagascar 078a2, Fort Dauphin (Tulear), Mandena (QMM area), River Amendano, 0.5 km upstr. road bridge, 12 m asl., riffle upstream, 15.ix.2001, Gerecke & Goldschmidt 0/1/0 (mounted).
Diagnosis: Dorsal shield oval (L/W ratio 1.1–1.2), with medial depression; muscle scars with strongly pronounced thickenings (Figs. 37I –J), located at nearly equal distance anterior and posterior to the postocularia; gnathosomal bay V-shaped; tips of Cx-I slightly extending beyond frontal margin; medial margin of Cx-IV reduced to a median angle, posterior margin of Cx-IV directed postero-laterally. Palp (Figs. 5D–E): P-1 with a dorsal seta; P-2 strongly inflated, in proximal part with strongly protruding dorsal margin forming a more or less pronounced acute angle; P-3 much higher proximally than distally, ventral margin slightly concave, dorsal margin strongly convex; P-4 slender, basally thickened, from here to anterior tip equally narrowed. Legs: I-L (Fig. 6A) with I-L-6 stout, L/H ratio 2.0–2.2, ventral margin in proximal third forming an obtuse angle, from here to tip slightly convex; II-L-6 (L/H ratio 2.3–2.7), III-L-6 (L/H ratio 3.0–3.3) and IV-L-6 (L/H ratio 3.2–3.6) thickened; IV-L: Fig. 6B; swimming setae numbers: III-L-4, 5–6; III-L-5, 7–8; IV-L-4, 3–4; IV-L-5, 6–7.
Description:
Male (holotype, in parentheses paratype Madagascar 061): Idiosoma (ventral view: Fig. 5B) L/W 425 (441)/ 389 (422). Dorsal shield (Figs. 5A, 37I) L/W 364 (372)/325 (325), L/W ratio 1.12 (1.15); gnathosomal bay L 72 (77). Gonopore long and narrow, L/W 83 (80)/16 (16); ejaculatory complex L (132). Palp: total L 147 (156–157); L/H, L/H ratio: P-1, 16/20, 0.8 (18/21.5, 0.83); P-2, 39/37, 1.04 (43-44/41.5, 1.05); P-3, 40/29, 1.38 (41/31, 1.32); P-4, 42/14, 3.0 (44/15.4, 2.9); P-5, 10/5, 2.1 (10/5, 2.2); chelicera total L 80 (91), basal segment L (55), claw L (36), ratio L basal segment/claw (1.5); gnathosoma vL 83 (87). Legs: dL of I-L: (38), (39), 39 (40), 42 (45), 55 (60), 73 (70); I-L-6 H 35 (35), I-L-6 L/H ratio 2.1 (2.0); II-L-6 L/H 88 (88)/35 (34), ratio 2.5 (2.6); III-L-6 L/H 92 (93)/30 (31), ratio 3.0 (3.0); dL of IV-L: 70 (72), 66 (69), 54 (60), 63 (72), 86 (91), 94 (103); IV-L-6 H 29 (29), ratio 3.2 (3.6).
Female (paratype Madagascar 125d, in parentheses Madagascar 061): Idiosoma (ventral view: Fig. 5C) L/W 434 (492)/384 (463). Dorsal shield (Fig. 37J) L/W 369 (417)/316 (374), L/W ratio 1.17 (1.12); gnathosomal bay L 70 (81). Gonopore L/W 92 (97)/66 (74), L/W ratio 1.4 (1.3). Palp: total L 152 (165-172); L/H, L/H ratio: P-1, 17/ 23, 0.75 (18.5/24 0.77); P-2, 39/39, 1.0 (46-48/44.6, 1.03-1.07); P-3, 43/31, 1.4 (43-46/32, 1.34-1.44); P-4, 42/15, 2.8 (46-48/15.4, 3.0-3.1); P-5, 11/6, 1.8 (11/5, 1.9); chelicera total L 84; gnathosoma vL 85 (94). Legs: dL of I-L: 39 (42), 33 (39), 35 (40), 40 (43), 57 (62), 65 (71); I-L-6 H 32 (32), I-L-6 L/H ratio 2.0 (2.2); II-L-6 L/H 78 (85)/34 (32), ratio 2.3 (2.7); III-L-6 L/H 94 (102)/30 (31), ratio 3.1 (3.3); dL of IV-L: 66 (68), 71 (75), 52 (66), 65 (80), 89 (97), (115); IV-L-6 H (32), ratio (3.6).
Etymology: This epithet is based on the Latin adjective angulatus (with angles) and refers to the shape of dorsal margin of P-2.
Discussion: Due to the tips of Cx-I extending slightly beyond ventral shield and distal segments of IV-L noticeably shorter and more stocky, D. angulipalpis sp. nov. is most similar to D. mandena sp. nov. (see there for discussion of differences).
Distribution: Eastern Madagascar, recorded from lentic areas in streams in rain forest and coastal dry forest in the northern and southern part.
description: Published as part of Pešić, Vladimir, Cook, David, Gerecke, Reinhard & Smit, Harry, 2013, The water mite family Mideopsidae (Acari: Hydrachnidia): a contribution to the diversity in the Afrotropical region and taxonomic changes above species level, pp. 1-75 in Zootaxa 3720 (1) on pages 16-17, DOI: 10.11646/zootaxa.3720.1.1, http://zenodo.org/record/285029