Libitia bipunctata Sørensen, 1932

Medrano, Miguel, Ázara, Ludson Neves de & Kury, Adriano Brilhante, 2020, The short-legged Andean cosmetids revisited: the genus Libitia Simon, 1879 with description of two new species (Opiliones, Cosmetidae), European Journal of Taxonomy 634, pp. 1-25 : 5-9

Libitia bipunctata Sørensen, 1932 comb. rev.

Figs 1–4 , 14

Libitia (Libitia) bipunctata Sørensen in Henriksen, 1932: 417 .

Libitia bipunctata – Mello-Leitão 1933: 109.

Libitiella bipunctata – Roewer 1947: 8, pl. 1, fig. 3.

Diagnosis

Can be distinguished from L. cordata and L. gandalf sp. nov. by having small white-yellowish blots restricted to the marginal scutal groves (or sulci) (rails, see Medrano & Kury 2016) as dissociated

pattern; from L. iguaque sp. nov. by having coda as long as mid-bulge and by possessing penis with MS D1 closer to MS C2 than MS D2.

Etymology

The name is derived from the Latin ‘ bipunctatus ’, meaning ‘one who has two blots’.

Material examined

Syntypes

COLOMBIA • 2 ♀♀; Cundinamarca Department [originally mistakenly reported as “Venezuela”], without further locality data; BMNH • 3 ♂♂, 2 ♀♀; between La Unión and Páramo de Chingaza [originally misspelled as “Chingusa”]; 1000–2400 m a.s.l.; ZMG .

Other material

COLOMBIA – Cundinamarca Department • 26 ♂♂, 17 ♀♀, 20 juvs; Bogotá, Cantera Soratama ; 2800 m a.s.l.; A. Álvarez leg.; MPUJ_ENT 11432 • 1 ♂, 1 ♀; Bogotá, Humedal La Conejera; 4.760671° N, 74.106359° W; 2600 m a.s.l.; Apr. 2000; ICN-AO 292 • 1 ♂; Bogotá, Quebrada La Vieja ; 4.649889° N, 74.048065° W; 2600 m a.s.l.; 12 Dec. 2010; O. Villarreal, D. Luna and M. Medrano leg.; ICN-AO 922 • 4 ♂♂, 16 ♀♀; Bogotá, Sierras del Chicó , 4.671375° N, 74.038878° W; 15 May 2007; I. Morales leg.; ICN-AO 470 • 10 ♀♀; Bogotá, Usme, Parque Entrenubes, Cerro Juan Rey ; 4.521586° N, 74.097581° W; 2700 m a.s.l.; 23–25 May 2003; L. Benavides leg.; ICN-AO 420 • 1 ♂, 14 ♀♀; same collection data as for preceding; ICN-AO 419 • 1 ♂; Choachí, Páramo Cruz Verde vía Bogotá-Choachí ; 4.592793° N, 74.033624°W; 3300 m a.s.l.; 14 Dec. 1979; ICN-AO 76 • 1 ♂, 1 ♀; Guasca, Reserva Biológica El Encenillo ; 4.794559° N, 73.909036° W; 8–10 Dec. 2012; A. Herrera, C. Suárez and E. Ariza leg.; ICN-AO 1383 • 1 ♂, 3 ♀♀; Guasca, Reserva Biológica El Encenillo ; 8–10 Dec. 2012; C. Suárez and E. Ariza leg.; necrotrampa; ICN-AO 1204 • 12 ♀♀; La Calera, E.A.A.B. Club La Aguadora - Embalse de San Rafael ; 4.706040° N, 74.008119° W; 2700 m a.s.l.; Sep. 2010; P. Barriga and D. Tobar leg.; ICN-AO 472 • 5 ♀♀; same collection data as for preceding; ICN-AO 484 • 1 ♂; Parque Nacional Natural Chingaza, Alto de La Bandera ; 4.719018° N, 73.820675° W; 3660 m a.s.l.; IAvH-I-64 • 1 ♂; same collection data as for preceding; IAvH-I-67 • 1 ♀; same collection data as for preceding; IAvH-I-76 • 1 ♀; same collection data as for preceding; IAvH-I-77 • 1 ♂; Parque Nacional Natural Chingaza, La Siberia; 4.712840° N, 73.945862° W; 3170 m a.s.l.; IAvH-I-72 • 1 ♀; same collection data as for preceding ; IAvH-I-73 • 1 ♂; Parque Nacional Natural Chingaza , Vda. El Manzano, Reserva Forestal Río Blanco , Palacio Laguna Brava ; 4.675665° N, 73.880396° W; 2930 m a.s.l.; IAvH-I-87 • 1 ♀; Parque Nacional Natural Chingaza, Valle del Fraylejón ; 4.525783° N, 73.774845° W; 3170 m a.s.l.; IAvH-I-122 • 4 ♂♂, 2 ♀♀; Parque Nacional Natural Chingaza ; 4.575° N, 73.853° W; 2950 m a.s.l.; Y. Cifuentes leg.; ICN-AO 1437 • 1 ♀; San Antonio del Tequendama, Los Tunos ; 4.564730° N, 74.218390° W; 2009; ICN-AO 996 • 1 ♂; Sibate, Alto de San Miguel ; 4.450395° N, 74.300759° W; 2630 m a.s.l.; 1 Dec. 1979; I. de Arevaldo leg.; ICN-AO 78 • 1 ♂, 1 ♀; Soacha, near Chusacá ; 4.538153° N, 74.280819° W; 2770 m a.s.l.; Dec. 1979; ICN-AO 52 • 1 ♂; Zipaquirá, Vereda Ventalarga, Represa Pantano Redondo ; 5.042453° N, 74.036160° W; 3000 m a.s.l.; 27 Apr. 2013; E. Florez et al. leg.; ICN-AO 468 .

Redescription

Male (ICN 419)

MEASUREMENTS. CL = 1.4, AL = 2.7, CW = 2.4, AW = 3.3, IOD = 0.6, Fe I = 1.7, Ti I = 1.3, Fe II = 2.9, Ti II = 2, Fe III = 2.5, Ti III = 1.5, Fe IV = 2.7, Ti IV = 2.1.

DORSUM ( Fig. 1 A–D). Dorsal scutum alpha-type, finely granular. Free tergites with rows of granules. Posterior margin of dorsal scutum convex. Small white-yellowish blots restricted to the marginal scutal groves, not invading the areas of mesotergum nor grooves medially.

VENTER. Free sternites finely granular; coxae II–IV finely and uniformly granular; coxa I with longitudinal row of tubercles and smooth area corresponding to lace area of pedipalp. Anal operculum finely granular

CHELICERAE ( Fig. 3 B–C). Basichelicerite finely and uniformly granular with some rounded protuberances in basal and ectal margins, two ectodistal small setiferous protuberances. Movable finger with row of eight teeth; fixed finger with five triangular teeth, decreasing in size from distal to basal part of finger.

PEDIPALPS ( Fig. 3A ). Trochanter with strong ventral apophysis. Femur dorsally convex without pronounced dorsal keel or tubercles, with ventral row of ten well-formed setiferous tubercles and a mesodistal process. Patella with mesal keel. Shallow slit along tibia mesal surface, separating dorsal and ventral sides.

LEGS ( Fig. 1B , E–F). Uniformly granular, femora III and IV slighted curved backwards. Coxae I-IV with prolateral conical apophyses, I and II larger than III and IV. Tarsal claws of legs III and IV smooth. Tarsal counts: 5(3)/6(3)/5/5.

COLOR ( Fig. 1 ). Body and appendages background Strong Orange Yellow (68) mottled in Dark Yellowish Brown (78), ladder mask Pale Greenish Yellow (104). Pedipalpus as well as trochanters and tarsomeres of legs Light Greenish Yellow (101).

Female

Dorsal scutum and Fe IV shorter than males, with coda wider. Basitarsomeres I, III and IV not enlarged.

Variation ( Fig. 2 )

Pattern of yellow spots varying from an immaculate dorsal scutum to a well-filled ladder mask.

Habitat

Some specimens (material examined) were collected in leaf litter and under rocks from High-Andean forest to Paramo, between 2600–3660 m, using both manual collect and passive methods, as a pitfall or ‘necrotrampa’ used for animals with affinity for decomposed organic matter.

Figures

Fig. 1. Libitia bipunctata Sørensen, 1932, ♂ (ICN-AO 1040), habitus. A. Dorsal view. B. Dorsal view, panoramic. C. Frontal view. D. Lateral right view. E–F. Right femur IV, dorsal and ventral view, respectively. Scale bars = 1 mm.

Fig. 2. Libitia bipunctata Sørensen, 1932, variation of spot pattern on dorsal scutum. A–D. ♂♂. A. IAvH-I-67. B. ICN-AO 468. C. ICN-AO 419. D. IAvH-I-87. E–H. ♀♀. E. IAvH-I-76. F–H. UNAL- AO 420. Scale bar = 1 mm.

Fig. 3. Libitia bipunctata Sørensen, 1932, ♂ (ICN-AO 470). A. Left pedipalp, ventral view. B. Left cheliceral hand, dorsal view. C. Left chelicera, dorsal view. Scale bars = 1 mm.

Fig. 4. Libitia bipunctata Sørensen, 1932, ♂ (ICN-AO 419), distal part of penis. A. Dorsal view B. Right lateral view. C. Ventral view, macrosetae colorised and numbered. D. Stylus, dorsal view. Scale bars: A–C = 50 μm; D = 20 μm.

Fig. 14. Central Colombia, showing the distribution of species of Libitia Simon, 1879 (inset: NW South- America, for context). Highlighted Colombian departments are from north to south: Boyacá (red), Cundinamarca (orange) and Meta (yellow).