Two New Opilio Herbst, 1798 Species (Arachnida: Opiliones: Phalangiidae) From Caucasus Region Author Snegovaya, Nataly Yu. text Ecologica Montenegrina 2016 2016-07-14 8 27 33 https://doi.org/10.37828/em.2016.8.3 journal article 301483 10.37828/em.2016.8.3 966c22a5-a10d-4d17-bcdf-433f99f24520 2336-9744 13314890 urn:lsid:zoobank.org:pub:7AF86E8C-57BF-4232-ADA6-15C5EAF0B53D Opilio rossicus , sp. n. ( Figs. 2-19 ) Material : Holotype ♂ , Paratypes 7♂ , 1♀ , Russia , Rostov region , Orlov district , vicinity of Manich settlement, Manich-Gudilo Lake Valley , 2- 9.10.2009 , leg. Perepechaenko V .L. Small size harvestman, 2.9 long, 1.6 wide. Body surface covered with trasverse rows of denticles along margins of tergites. Color of the body light-brown with dark-brown dorsal part. Group of denticles are situated in front of eye mound. Eye mound low, typical for Opilio genus, with 3-4 denticles on each side. Legs short, femora I short (1.75), cylindrical, much thicker than other legs, densely covered with transverse rows of denticles ( Table 1 ). Pedipalps small, femur dorsally with black-tipped denticles, ventrally and laterally with large denticles, patella dorsally and ventrally with denticles, tibia dorsally and ventrally with several denticles. Pedipalp lengths 1.4+0.25+0.5+0.95 = 3.1. Chelicera small, basal segment dorsally with some denticles. Cheliceral basal segment length 1.1, distal segment 1.1. Penis small with wide base (1.65 long, glans 0.2, stylus 0.08) narrows to glans, wings small size, glans of the penis oval in form with 2 pairs of setae. Female differs from male by being larger in size, more oval form of the body and less developed denticles on the body and extremities. Female body length 4.8, wide 2.5. Pedipalp lengths 0.9+0.4+0.6+2.4 = 4.3. Cheliceral basal segment length 2.1, distal segment 1.25. Figures 2-19. Opilio rossicus sp.n. : 2 – male body, dorsal view; 3 – male body, lateral view; 4 – female body, dorsal view; 5 – eye mound, dorsal view (male or female); 6 – eye mound, lateral view (male or female); 7 – male femur I, dorsal view; 8 - male right pedipalp, mesal view; 9 – male right pedipalp, ectal view; 10- male right chelicera, ectal view; 11 – male right chelicera, mesal view; 12 - female right pedipalp, mesal view; 13 - female right pedipalp, ectal view; 14 - female right chelicera, mesal view; 15 – female right chelicera, ectal view; 16 – penis, dorsal view; 17 – penis, lateral view; 18 – glans of penis, dorsal view; 20 – glans of penis, lateral view. Table 1. Opilio rossicus sp.n. male (holotype) and female (paratype) leg segment lengths:
Leg Femur Patella Tibia Metatarsus Tarsus Total
I 1.75(2) 0.5(0.75) 1.5(1.8) 1.7(1.6) 3.0(3.8) 8.46(9.95)
II 3.8(4.3) 1.0(1.0) 3.6(4.0) 2.0(2.3) ---(3.8) ---(15.4)
III 1.6(---) 0.5(---) 1.5(---) 1.7(---) ---(---) ---(---)
IV 2.5(3.0) 0.6(0.8) 2.3(2.5) 2.75(3.0) 5.1(6.0) 13.25(15.3)
Diagnosis – The new species is closely related to Opilio caucasicus Snegovaya, 2010 and Opilio lederi Roewer, 1911 , but differs from O.caucasicus by the smaller body size, differences in penis structure: Opilio caucasicus has a large glans, significantly wider base and wider wings. From another species O.lederi , the new species differs by the smaller size, form of femur I and details of the penis ( Table 2 ). Table 2. Comparison of diagnostic features in Opilio rossicus sp.n. , Opilio caucasicus Snegovaya, 2010 and Opilio lederi Roewer, 1911 .
Characters Opilio rossicus sp.n. Opilio lederi Roewer, 1911 Opilio caucasicus
(figs. 2-19) ( Snegovaya 2010: 3-5 , figs. Snegovaya, 2010
1-9) ( Snegovaya 2010: 9 ,
17, figs. 92-100)
Body body length 2.9, covered with body length 6.2, covered body length 5, covered
denticles with black-tipped denticles with small denticles
Eye mound low, with 3-4 pairs denticles low, wide,4-5 pairs circular, 5-7 pairs
relatively large black-tipped denticles
denticles
Legs short, femur I thickened and short, femur I thickened and long, with denticles,
cylindrical, densely covered spindle-shaped form, femur I cylindrical,
with transverse rows of covered large denticles covered by denticles
denticles
Pedipalps small, dorsally and ventrally strong, femur ventrally with normal, covered with
with black-tipped denticles large spine-tipped denticles, denticles and setae
dorsally with large denticles;
patella dorsally with
denticles; tibia ventrally and
dorsally with denticles
Chelicera small, segments dorsally with large and strong, basal normal, covered with
black-tipped denticles segment dorsally with some setae
denticles, distal segment
dorsally with some big
granules
Penis length 1.65, wings small size, length 3.35, with small length 2.0; glans oval,
glans oval form with 2 pair of wings, glans oval with 2 pair in lateral view
setae setae narrowed to stylus,
with 2 pair of setae;
small wings
Etymology. The species is named after Russia , the country from where it was discovered.