Djeboa angulipalpis Pešić, Cook & Gerecke, 2013

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, Zootaxa 3720 (1), pp. 1-75 : 16-17

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.

Figures

FIGURE 5 A – E. Djeboa angulipalpis sp. nov. (A – B, D = male, C, E = female): A = dorsal shield; B – C = idiosoma, ventral view; D = palp; E = palp and gnathosoma.

FIGURE 6 A – B. Djeboa angulipalpis sp. nov. (B = male, A = female): A = I-L; B = IV-L.

FIGURE 37 A – L. Photographs of dorsal shield. A – B. Djeboa amendano sp. nov.: A — holotype male; B — paratype female. C. Djeboa curtipalpis sp. nov., holotype male. D. Djeboa depressa sp. nov., holotype male. E. Djeboa compressa K. Viets, 1914, female lectotype (SMF 43190). F. Djeboa expansipalpis (Cook, 1966), female, Tinbé, Côte d’Ivoire. G. Djeboa gledhilli. sp. nov., holotype male. H. Djeboa ghanaensis sp. nov., holotype male. I – J. Djeboa angulipalpis sp. nov.: I — holotype male; J — paratype female. K – L. Djeboa mandena sp. nov.: K— holotype male; L — paratype female.