Eulibitia pollux,

Medrano, Miguel & Kury, Adriano B., 2017, Taxonomic revision of the Andean genus Eulibitia Roewer, 1912 (Arachnida, Opiliones, Cosmetidae), with the description of five new species, European Journal of Taxonomy 357, pp. 1-55: 34-40

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Eulibitia pollux

sp. nov.

Eulibitia pollux  sp. nov.

Figs 23–26View FigView FigView FigView Fig, 31BView Fig, 34View Fig; Table 4


This species is similar to E. castor  sp. nov. in having the paramedian tubercles on the posterior margin of the scutum acuminate, but differs from it because the other areas are unarmed ( Figs 23View Fig A–B, D–E, 24 A). Ladder mask often as paired points in scutal grooves ( Fig. 24CView Fig); in its full form it covers the scutal groove between areas I and II with a spot with a shape of a mustache ( Fig. 24FView Fig). Coda short, with symmetrical mid-bulge ( Figs 23AView Fig, 24AView Fig); coxa IV slightly granulated, without clavi inguines ( Fig. 24AView Fig). Femur IV curved in dorsal view, without conspicuous ornamentation ( Fig. 25View Fig A–C). This is the only species of Eulibitia  in which macrosetae D2 are minute, of the same size as MS E and MS B ( Fig. 26BView Fig).


Noun in apposition from Pollux, son of Leda and Zeus, and twin of Castor. From Greek mythology.

Material examined


COLOMBIA: ♂, Boyacá Department, Villa de Leyva, Santuario de Fauna y Flora Iguaque, El Níspero [5°38′ N, 73°31′ W] ( IAvH 35).



COLOMBIA: 3 ♂♂, 2 ♀♀, 1 immature, Boyacá Department, Villa de Leyva, Santuario de Fauna y Flora Iguaque, 5°42′6.3′′ N, 73°27′22.4′′ W, 2941 m a.s.l., 26– 27 Nov. 2011, A. García and AB Kury leg. ( MNRJ 19369); 1 ♂, 1 ♀, Boyacá Department, Villa de Leyva, SFF Iguaque, 5.7200° N, 73.4579° W, 2800 m a.s.l., 22 Sep. 2013, A. García and S. Galvis leg. ( ICN-AO 1379).

Other material

COLOMBIA: Boyacá Department – 1 ♂, Villa de Leyva, SFF Iguaque, sector Carrizal, 5°41′52.28′′ N, 73°27′11.28′′ W, 9 Jun. 2001, E. Flórez leg. ( ICN-AO 295); 2 ♀♀, Villa de Leyva, SFF Iguaque 5.720016° N, 73.457901° W, 2800 m a.s.l., 22 Sep. 2013, A. García and S. Galvis leg. ( ICN-AO 1427); 2 ♀♀, Villa de Leyva, Santuario de Fauna y Flora Iguaque, El Níspero [5°38′ N, 73°31′ W] ( IAvH 33, IAvH 34); 1 ♀, Santuario de Fauna y Flora Iguaque, Cabaña Carrizal [5º42′ N, 73º27′ W], 2850 m a.s.l. ( IAvH 16); 1 ♂, Villa de Leyva, 5.720016° N, 73.457901° W, 2900 m a.s.l. ( IAvH 18); 6 ♀♀, San Pedro de Iguaque [Chiquiza], Morro Negro [5°36′36″ N, 73°29′20″ W], 3220 m a.s.l. ( IAvH 14, IAvH 19, IAvH 20, IAvH 21, IAvH 22, IAvH 30); 2 ♂♂, same collection data as preceding( IAvH 27, IAvH 66); 1 ♂,same locality as preceding, 3220m a.s.l., 14– 16 May 2003,E. González and C.Reina leg.( IAvH 81); 2 ♂♂,Santuario de Fauna y Flora Iguaque,Cabaña Carrizal[5º42′ N, 73º27′ W], 2850m a.s.l.( IAvH 23, IAvH 24); 1 ♂,Villa de Leyva, Laguna Iguaque [5.642778° N, 73.564722° W], 2800 m a.s.l.( IAvH 28); 1 ♀, Santuario de Fauna y Flora Iguaque, Quebrada Los Francos [5.700° N, 73.450° W], 2860 m a.s.l. ( IAvH 31); 1 ♂, Villa de Leyva, SFF Iguaque, 5.7200° N, 73.4579° W, 2750 m a.s.l., Mar. 1993 ( ICN-AO 474). Cundinamarca Department – 4 ♂♂, 3 ♀♀, Bogotá, Usme, Parque Entrenubes, Cerro Juan Rey, 4°31′17.71′′ N, 74°5′51.29′′ W, 2700 m a.s.l., 23– 25 May 2003, high scrub, pitfall, L. Benavides leg. ( ICN-AO 422); 1 ♀, Parque Nacional Natural Chingaza, Vereda San Francisco, Reserva Forestal Río Blanco, Palacio [4.722° N, 73.828° W], 2970 m a.s.l. ( IAvH 37); 1 ♂, Parque Nacional Natural Chingaza, Alto de La Bandera [4.5167° N, 73.750° W], 3660 m a.s.l. ( IAvH 65). –

SANTANDER DEPARTMENT: 1 ♂, Encino, Santuario de Fauna y Flora Guanentá, Vega del Diablo, Río Negro [5.950° N, 73.183° W], 1900 m a.s.l. ( IAvH 95); 2 ♀♀, same collection data as preceding ( IAvH 96, IAvH 97). Valle del Cauca Department – 1 ♂, Palmira [3.531° N, 76.260° W, 1040 m a.s.l.], 22 May 1998, J. Herrera leg. ( ICN-AO 1105).


Male (based on holotype)

MEASUREMENTS. CL = 1.86, AL = 3.30, CW = 2.80, AW = 4.20, Fe IV = 4.27, Ti IV = 3.45.

DORSUM ( Figs 23View Fig, 24AView Fig). Dorsal scutum beta-shaped, with symmetrical mid-bulge. Posterior margin of scutum with two contiguous acuminate paramedian tubercles. Lateral margins of scutum granulated. Posterior margin of scutum with a row of small tubercles. Tergites with row of small tubercles and anal operculum finely granular.

VENTER ( Fig. 23B, EView Fig). Free sternites finely granular; coxae II–IV finely and uniformly granular; coxa I with longitudinal row of tubercles and smooth area matching interlocking Tr of pedipalpus.

CHELICERAE ( Fig. 25FView Fig). Basichelicerite with row of seven small tubercles on basal side and some disperse tubercles on dorsal side; movable finger with row of eleven tubercles, giving a serrated appearance; fixed finger with five tubercles, decreasing in size from basal to distal part of finger.

PEDIPALPS ( Fig. 25D, EView Fig). Trochanter with strong ventral process. Femur with pronounced dorsal row of seven separated tubercles, with ventral row of seven setiferous tubercles and mesodistal process. Patella with low mesal keel.

LEGS ( Figs 24BView Fig, 25View Fig A–C). Coxa IV finely granulated, without clavi inguines, distal apophysis of coxa IV tuberculate and directed laterally. Trochanter IV with small retro-distal apophysis. Femur IV curved in dorsal view, with two longitudinal ventral rows of small tubercles along entire length. Patella IV substraight, with small tubercles. Tarsal counts: 6–6(3)/10–10(3)/6–6/7–7.

COLOR ( Fig. 23View Fig). Body and appendages color background 40 (Strong Reddish Brown) mottled in 44 (Dark Reddish Brown), ladder mask 104 (Pale Greenish Yellow). Pedipalpus, chelicerae, and trochanters and tarsomeres of legs 83 (Brilliant Yellow).

GENITALIA ( Fig. 26View Fig). Ventral plate subrectangular, narrower basally and distal border hardly concave; dorsal apophysis of glans long and narrow, wattle long. Shapes and organization of macrosetae as follows: MS C1–C2 large, curved and flat; MS D1 large and straight, D2 minute; MS A1–A2 large,

cylindrical, straight and located in middle of ventral plate; MS B and MS E1–E2 ventral, very small, immersed in microsetae. Pair of MS B at base of ventral plate.


Right tubercle of posterior margin absent in some specimens ( Fig. 23FView Fig). Variation of spots in DS as shown in Fig. 24View Fig C–F. Tarsal counts: 5–6; 8–11; 6; 6–7. Variation of measurements is given in Table 4.


Coda larger than in males ( Fig. 24View Fig C–D). Basitarsomeres in legs I thickened but not swollen ( Fig. 24BView Fig).


E. pollux  sp. nov. occurs in the WWF ecoregions: (1) Magdalena Valley montane forests (NT0136), tropical and subtropical moist broadleaf forest biome; (2) northern Andean páramo (NT1006), montane grassland and shrubland biome, and (3) Cauca Valley montane forests (NT0109), tropical and subtropical moist broadleaf forest biome ( Fig. 34View Fig).


University of Copenhagen


Harvard University - Arnold Arboretum


Field Museum of Natural History, Botany Department


Royal Botanic Garden Edinburgh


"Alexandru Ioan Cuza" University


Herbarium Messanaensis, Universit� di Messina


Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet


Nanjing University


Naturhistorisches Museum Wien


Museu Nacional/Universidade Federal de Rio de Janeiro


Department of Botany, Swedish Museum of Natural History