Libitia Simon, 1879

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: 4-5

publication ID

https://doi.org/10.5852/ejt.2020.634

publication LSID

lsid:zoobank.org:pub:66AEE1D7-51BF-4583-9A19-947F61ECC7DE

DOI

http://doi.org/10.5281/zenodo.3795370

persistent identifier

http://treatment.plazi.org/id/03AC87DB-EC50-CA1E-7D58-574FFDBC4B3E

treatment provided by

Valdenar

scientific name

Libitia Simon, 1879
status

 

Genus Libitia Simon, 1879  

Libitia Simon, 1879: 216   [type species: Cosmetus cordatus Gervais, 1844   , by subsequent designation of Roewer (1912)].

Libitiella Roewer, 1947: 8   [type species: Libitia bipunctata Sørensen, 1932   , by original designation]. syn. nov.

Libitia   – Simon 1880: 103 — Roewer 1912: 11; 1923: 293. — Mello-Leitão 1923: 108; 1926: 331; 1932: 53; 1933: 105, 109; 1935: 113. — Kästner 1937: 389. — Kury 2003: 65 (revalidated) [junior subjective synonym of Vonones Simon, 1879   by Goodnight & Goodnight (1953: 59)].

Libitia (Libitia)   – Sørensen in Henriksen 1932: 417.

non Libita [subsequent incorrect spelling] – Roewer 1928: 552.

Etymology

Obscure, it sounds to us as a Roman woman’s name. Gender feminine.

Diagnosis

Can be differentiated in having shorter legs (femur IV shorter than the total length of the dorsal scutum) contrasting with other short-legged cosmetids as Rhaucus Simon, 1879   , Neocynorta   or Eulibitia   (its femur IV is longer than dorsal scutum length) ( Fig. 1B View Fig , E–F). Outline of dorsal scutum alpha-type with faint marked constrictions forming a parallel coda in males and divergent coda in females contrasting with Ambatoiella   that has well-marked constrictions ( Figs 2 View Fig , 6 View Fig ). Can be separated from other genera by having cheliceral sockets (invaginations in the anterior margin of the carapace where the basichelicerites fit) shallow, with well-marked lateral quadrangular projections (triangular in Eulibitia   , rounded in Rhaucus   , bifid in Metalibitia   ) ( Figs 2 View Fig , 6 View Fig ). Posterior margin of DS without yellow stripe (transversal stripe in Eulibitia   and some Rhaucus   species) ( Fig. 1 View Fig A–D). Basitarsomeres I, III and IV remarkably enlarged in males ( Figs 1B View Fig , 5B, D View Fig , 9 View Fig C–D). Penis with an elongate wattle in stylus forming distally two long serrate membranes and with a medial cleft ( Fig. 5 View Fig ), without stylar barbs.

Description

Small and flat animals (<4 mm) with short legs ( Fig. 1B View Fig ). Outline of dorsal scutum alpha-type with symmetrical mid-bulge ( Fig. 2 View Fig ).

Mesotergum flat and unarmed. Scutum with yellowish white blots as a ‘ladder mask’ over dark brown background (see Medrano & Kury 2016, 2017), with intraspecific variation from absent ( Fig. 2 View Fig ) to strongly filled invading the entire area I and II ( Fig. 6 View Fig ) or part of carapace ( Fig. 9A View Fig ).

Coxa IV entirely visible in dorsal view, without groin warts (defined in Kury & Barros, 2014) and small prodorsal distal apophysis. Femur III and IV curved and uniformly tuberculate ( Fig. 1B View Fig ).

Penis ( Fig. 4 View Fig ): ventral plate (VP) sub-rectangular with latero-apical borders protruding from the ventral plate, stylus with an incrassated wattle forming apically two long serrate membranes creating a medial cleft ( Fig. 4D View Fig ), without stylar barbs. VP laterally with two pairs of MS A, two pairs of MS C (sometimes asymmetrical with 3 MS C on one side, as in L. bipunctata   and L. gandalf   sp. nov.), two pairs of MS D (D1 three times longer than D2), and ventrally with two pairs of MS E and one pair MS B ( Fig. 4C View Fig ).

Note

As no diagnostic differences have been found among the penes of each of the four species, no specific descriptions are made.

Included species

Libitia cordata ( Gervais, 1844)   , Libitia bipunctata Sørensen, 1932   , Libitia gandalf   sp. nov. and Libitia iguaque   sp. nov.

Geographic distribution

Central part of Eastern Cordillera of Andes from 2600 to 3700 meters, in Cundinamarca, Boyacá and Meta departments of Colombia.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Opiliones

Family

Cosmetidae

Loc

Libitia Simon, 1879

Medrano, Miguel, Ázara, Ludson Neves de & Kury, Adriano Brilhante 2020
2020
Loc

Libitiella

Roewer C. F. 1947: 8
1947
Loc

Libitia

Kury A. B. 2003: 65
Goodnight C. J. & Goodnight M. L. 1953: 59
Kastner A. 1937: 389
Mello-Leitao C. F. de 1933: 105
Mello-Leitao C. F. de 1932: 53
Mello-Leitao C. 1926: 331
Roewer C. F. 1923: 293
Mello-Leitao C. 1923: 108
Roewer C. F. 1912: 11
Simon E. 1880: 103
1880
Loc

Libitia

Simon E. 1879: 216
1879
Loc

Libitia (Libitia)

Roewer 1928: 552