Atractides (Tympanomegapus) tergumus Zhang & Guo, 2023

Atractides (Tympanomegapus) tergumus Zhang & Guo, 2023

Figs 22–25 View Fig View Fig View Fig View Fig

Diagnosis

O 2 slightly anterior to D 1. Genital field with three pairs of acetabula forming triangle, V 1 separated from V 2, excretory pore smooth and slightly posterior to level of V 1 and V 2. P-4 ventral margin straight and divided by two ventral hairs in sectors 3:2:3, sword seta near distoventral hair, P-5 without lateral cheeks. I-L-5 thickens from base to end, S-1 and S-2 both with blunt tips and similar in shape; I-L-6 slightly straight and end little thicker than base.

Material examined

P.R. CHINA • 1 ♂, 2 ♀♀; Hainan Province, Lingshui Li Autonomous County, Diaoluo Mountain National Forest Park; 18.6683° N, 109.9227° E; 84 m a.s.l.; 13 Apr. 2023; Hai-Tao Li, Yu-Lin Zheng and Yu-Hao Zhang leg.; main river (Diaoluo River) 40–50 cm deep, with sand and rotten leaves on bottom, plants around, shore with helophytes ( Fig. 25B View Fig ); slide nos. HN-HY-2023041301 to 2023041303 ; GUGC GoogleMaps .

Description

Female (n = 2)

Idiosoma oval, O 1 posterior to A 1, O 2 slightly anterior to D 1 and on platelets; all slit organs visible, So 1 near A 2, So 2 at same level of D 1, So 3 at same level of D 2, So 4 located in front of L 4, So 5 behind of D 4 and out ( Figs 22A View Fig , 24A View Fig ). ACG fused and with suture line, apodemes of ACG strong and horn-like, and interspace between two apodemes; PCG separated, and suture line of Cx-III and Cv-IV nearly straight, C 4 near suture line between Cx-III and Cv-IV. Genital field with three pairs of acetabula forming triangle, V 1 separated from V 2, V 3 close to PCG, V 4 at same level of pregenital sclerite, V 3 and V 4 forming trapezoid, excretory pore smooth and slightly posterior to level of V 1 and V 2 ( Figs 22B View Fig , 24B View Fig ).

Palp five-segmented; P-1 elongated, P-2 and P-3 ventral margins more or less straight; P-4 with numerous dorsal hairs, ventral margin straight and divided by two ventral hairs in sectors 3:2:3, sword seta near to distoventral hair, P-5 without lateral cheeks ( Fig. 22C View Fig ). I-L-5 thickens from base to end, S-1 and S-2 both with blunt tips and similar in shape; I-L-6 slightly straight and end little thicker than base ( Fig. 23 View Fig ).

MEASUREMENTS (measurements of other specimens in parentheses). Idiosoma L 730 (746), W 578 (538); coxal field L 384 (366), Cx-III W 408 (410), ACG IL 271 (269), mL 126 (139), W 293 (280); gnathosoma bay L 177 (158); gonopore L 95 (107), pregenital sclerite L 97 (101), postgenital sclerite L 49 (56); Ac1–3 L 30 (33), 36 (34), 29 (34); chelicera L 365 (357), cheliceral claw L 99 (98), basal segment L 291 (283); gnathosoma L 271 (251); palp dL: P-1 71 (60), P-2 69 (70), P-3 73 (64), P-4 107 (100), P-5 33 (32); leg segments: I-L-1 dL 58 (57), I-L-2 dL 84 (74), I-L-3 dL 100 (93), I-L-4 dL 141 (129), I-L-5 dL 132 (122), HB 37 (35), I-L-6 dL 108 (100), HB 23 (22), S-1 L 39 (37), W 4 (4), S-2 L 41 (39), W 5 (4); dL: II-L-1 64 (58), II-L-2 72 (72), II-L-3 91 (83), II-L-4 117 (104), II-L-5 126 (114), II-L-6 117 (109); dL: III-L-1 62 (61), III-L-2 95 (81), III-L-3 92 (89), III-L-4 125 (114), III-L-5 143 (139), III-L-6 140 (135); dL: IV-L-1 137 (125), IV-L-2 106 (97), IV-L-3 149 (143), IV-L-4 177 (171), IV-L-5 192 (186), IV-L-6 167 (168).

Distribution

China (Hainan Province).

Remarks

In this study, we collected one male and two females from Diaoluo Mountain National Forest Park, Lingshui Li Autonomous County, Hainan Province, and found that the male matches the description of the male of A. (T.) tergumus . Moreover, the collection site is very close to the site where A. (T.) tergumus was collected. We believe the females we collected belong to A. (T.) tergumus , and this is the first description to the female of the species.