Djeboa depressa 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 : 28-31

Djeboa depressa Pešić, Cook & Gerecke sp. nov.

( Figs. 15A–E , 37D )

Type series: Holotype male, dissected and slide mounted, Côte d’Ivoire, River N’zi near Tinbé (T) drift day, 12.ix.1977 Statzner.

Diagnosis: Dorsal shield elliptical (L/W ratio 1.2), lateral ridges weakly pronounced, running near lateral border of shield; muscle scars without developed thickenings, visible only as small granulated areas ( Fig. 37D ); gnathosomal bay V-shaped; tips of Cx-I extending slightly beyond frontal margin; medial margin of Cx-IV well developed. Palp as shown in Fig. 15C ; P-1 with a dorsal seta; P-2 with straight ventral and strongly convexly bowed dorsal margins; P-3 ventral margin with a small basal hump, from here to distal end straight and nearly same height; P-4 ventral margin almost straight, proximally thicker than distally. Legs: I-L ( Fig. 15D ) with I-L-6 dL/H ratio 3.5–3.9, ventral and dorsal margins subparallel; IV-L-4-6: Fig. 15E ; swimming setae numbers: III-L-5, 4; IV- L-4, 4; IV-L-5, 4.

Description:

Male (holotype): Idiosoma (ventral view: Fig. 15B ) L/W 547/512. Dorsal shield ( Figs. 15A , 37D ) L/W 478/ 398, L/W ratio 1.2; gnathosomal bay L 86. Gonopore L/W 94/17. Palp: total L 193-199; L/H, L/H ratio: P-1, 25/28, 0.9; P-2, 53-56/41-42, 1.3; P-3, 43-46/25-27, 1.6-1.9; P-4, 55/18-19, 2.9-3.0; P-5, 17/8, 2.2; chelicera total L 101; gnathosoma vL 100. Legs: dL of I-L-2-6: 59, 68, 72, 92, 109-113; I-L-6 H 29-31, I-L-6 L/H ratio 3.5-3.9; dL of IV- L-4-6: 98, 116, 143.

Female: Unknown.

Etymology: Named for the depression of the dorsal shield.

Discussion: The combination of almost lacking muscle scars on dorsal shield and a relatively long P-3 (approximately long as P-4) with nearly the same height from base to tip (except for the proximoventral bulge), separates Djeboa depressa sp. nov. from all other species of the genus having an V-shaped gnathosomal bay.

Distribution: Côte d’Ivoire; known only from the type locality.

Figures

FIGURE 15 A – E. Djeboa depressa sp. nov., male: A = dorsal shield; B = idiosoma, ventral view; C = palp; D = I-L; E = IV-L- 4 - 6

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.