Atractides (Polymegapus) grigorievka, Pešić & Smit, 2018
publication ID |
https://doi.org/ 10.24349/acarologia/20184236 |
DOI |
https://doi.org/10.5281/zenodo.4501595 |
persistent identifier |
https://treatment.plazi.org/id/C37687EF-EC08-2244-AD86-FEB9FD50103D |
treatment provided by |
Felipe |
scientific name |
Atractides (Polymegapus) grigorievka |
status |
sp. nov. |
Atractides (Polymegapus) grigorievka n. sp. ( Figure 3 View Figure 3 )
Zoobank: F96801F6-F88E-4206-87B4-4ABA0296BD75
Type material — Holotype female ( RMNH), Kyrgyzstan, KR10 Grigorievka Gorge , rheocrenic spring, 42°46.585’N, 77°28.391’E, 1960 m asl., 11.vii.2013, leg. Pešić & Smit, dissected and slide mounted GoogleMaps . Paratype: one female, Kyrgyzstan, KR23 Karakal region, rheohelocrenic spring, Žeti-Egaz village, 42°19.238’N, 78°51.017’E, 2094 m asl., 13.vii.2013, leg. Pešić & Smit, left palp and I-L dissected and slide mounted.
Diagnosis — Female (Male unknown). Integument striated; suture line Cx-III and –IV in its medial part directed posteriorly; P-3 ventral margin slightly convex with one (occasionally two) ventral seta; P-5 short; excretory pore smooth; acetabula in a slightly curved line; I-L-5 with S-1 ending in a bluntly pointed tip.
Description — Female — Integument dorsally striated, muscle insertions unsclerotized. Posterior margin of Cx-I weakly curved, with a subcuticular protrusion; suture line Cx-III and -IV in its medial part directed posteriorly ( Figure 3A View Figure 3 ). Genital plates with narrow sclerite border, slightly indented between Ac-1/2 and Ac-2/3, acetabula in a slightly curved line ( Figure 3B View Figure 3 ). Excretory pore smooth; Vgl-1 not fused to Vgl-2. P-3 ventral margin slightly convex, with one (occasionally two) ventral seta(e), inserted in the middle of segment; P-4 setae insertions dividing ventral margin into sectors 1:4:2, sword seta proximally from proximoventral seta; P-5 short ( Figures 3 View Figure 3 C-D). I-L-5: S-1 with a blunt tip, more slender than S-2, S-2 pointed, strongly enlarged in the proximal part ( Fig. 3G View Figure 3 ); I-L-6 stout, very thick at the base, distally tapering ( Figures 3 View Figure 3 E-F).
Measurements — (holotype; in parentheses some measurements of paratype) — Idiosoma L 938 (1113), W 688 (925); coxal field: L 434; Cx-III W 553; Cx-I+II mL 134, lL 355; genital field L/W 223/224, genital plates L 144-145, pregenital sclerite W 122, maximum diameter Ac 1-3: 44, 31-38, 47-51.
Gnathosoma — palp total L 450; dL/H, dL/H ratio: P-1, 48/44, 1.1 (50/47, 1.06); P-2, 127/92, 1.38 (121/91, 1.34); P-3, 103/80, 1.29 (95/79, 1.2); P-4, 138/43, 3.2 (123/44, 2.82); P-5, 34/19, 1.83 (33/19, 1.75); L ratio P-2/P-4 0.92 (0.98). Chelicera total L 298.
Legs — I-L-5 dL 248 (232), vL 217 (186), dL/vL ratio 1.15 (1.25), maximum H 67 (72), dL/maximum H 3.7 (3.2), S-1 L 66, L/W ratio 5.3, S-2 L 70, L/W ratio 4.5, distance S-1-2 5.0, L ratio S-1/2 0.95; I-L-6 L 119 (108), maximum H 42 (41), L/maximum H ratio 2.8 (2.6); L ratio I-L-5/6, 2.1 (2.15).
Discussion — The new species is provisionally assigned to the subgenus Polymegapus K. Viets, 1926 , which was considered by Gerecke (2003) to be a monophyletic clade. The new species does not fit the diagnosis of the subgenus given by Gerecke et al. (2016) in the following features: 1) suture line Cx-III and –IV in its medial part directed posteriorly, 2) Cx-4 without triangular laterocaudal extensions of secondary sclerite, 3) I-L-5 with ventral margin shorter than dorsal margin, 4) P-5 short and less slender, and 5) excretory pore unsclerotized. The combination of the characters given under 1), 3) and 5) make the new species close to A. putihi Wiles, 1991 from SE Asia ( Wiles 1991, Pešić & Smit 2009, Smit & Pešić 2014). The latter species differs in genital plates, restricted to the level of the postgenital platelet, with the acetabula in a triangular arrangement, P-3 ventral margin slightly concave, without setae and IV-L-5 with 2 swimming setae. Probably A. grigorievka n. sp. represents an early derivative member with the typical palp and I-L not yet fully developed.
Etymology — Named after the canyon where the new species was found. The name is a noun in apposition.
Distribution — Kyrgyzstan, known from one rheocrenic ( Figure 10C View Figure 10 ) and one rheohelocrenic spring ( Figure 10G View Figure 10 ).
RMNH |
National Museum of Natural History, Naturalis |
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