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Rhaucus
Dorsal-3mm
Rhaucus vulneratus male from Usme, Bogotá, Colombia-Photo copyright © Andrés García and Andrés Hernández

Suborder

Laniatores

Superfamily

Gonyleptoidea

Family

Cosmetidae

Subfamily

Cosmetinae

Rhaucus (Simon, 1879) is a genus of the Neotropical family Cosmetidae, subfamily Cosmetinae with five valid species from the Colombian Andes. It has been recently reviewed (García & Kury, 2017[1]).

Synonymy Edit

Rhaucus Simon, 1879: 213; F.O. Pickard-Cambridge, 1905: 572; Roewer, 1912a: 77; 1923: 349; Mello-Leitão, 1923: 113; Mello- Leitão, 1926: 334; Mello-Leitão, 1932: 57; Mello-Leitão, 1933: 106; 110; Mello-Leitão, 1935: 113; Roewer, 1943: 13; Kury, 2003: 83. Rhaucus (Rhaucus): Sørensen in Henriksen, 1932: 352.

Cynorta [part.]: Goodnight & Goodnight, 1953: 37.

Neorhaucus F.O. Pickard-Cambridge, 1905: 572; Roewer, 1912a: 24; Roewer, 1923: 305; Mello-Leitão, 1926: 331; Roewer, 1927: 548; Mello-Leitão, 1932: 89; Mello-Leitão, 1933: 107; Mello-Leitão, 1935: 114; Kury, 2003: 73.

Pararhaucus Pickard-Cambridge, 1905: 572; Roewer, 1912a: 101; Roewer, 1912b: 142; Roewer, 1923: 378; Mello-Leitão, 1926: 335; Roewer, 1928: 551; Mello-Leitão, 1932: 88; Mello-Leitão, 1933: 107; Mello-Leitão, 1935: 114 [junior subjective synonym of Paecilaema C. L. Koch, 1839 by Goodnight & Goodnight (1953b: 54)].

EtymologyEdit

Rhaukos (latinized as Rhaucus) was an ancient city of Crete. Gender masculine.

PlacementEdit

Originally placed in Cosmetidae Cosmetinae[2].

Type speciesEdit

Rhaucus vulneratus Simon, 1879, by subsequent designation, in F.O. Pickard-Cambridge, 1905. There were two species cited in the original description of the genus, the second species is currently placed in Flirtea.

Diagnosis Edit

From García & Kury, 2017: 404 [1]) say "DS alpha type (in Cynorta, Eulibitia and Flirtea beta type), tegument granular (Figs 3a, 10a) (in Eulibitia, Flirtea and Metarhaucus smooth). Mesotergum clearly delimited, divided into four areas by well-marked grooves. Area III with a pair of tubercles varying between acuminate, dome-shaped or mammilliform (Figs 6c, 12c, 15c) (in Cynorta and Flirtea acuminate medium/high spines; in Eulibitia, very short tubercles). Pedipalpal tibia wide, spoon shaped (Figs 4b, 8b) (in Cynorta, Erginus, Eulibitia and Flirtea elongated, in Roquettea spatulate). Coxae IV with prominent multi-tuberculated clavi inguines (Figs 4h–i) (in Cynorta and Flirtea one large apophysis, in Eulibitia two irregular tubercles, in Taito wrinkled granules) and a multicapitate apophysis (mca) of at least seven tubercles (Fig. 4i) (in Cynorta three fused tubercles, in Taito two tubercles, in Platymessa two fused tubercles). Legs III–IV curved, robust and very granular, with a pair of ventral rows of spines from Fe to Ti (Figs 3d–e, 7d–e) (in Cynorta, Erginus, Eulibitia and Flirtea straight, thin and mostly smooth). Femur IV shorter than DS length (longer in Cynorta, Erginus, Eulibitia and Flirtea). VP of penis short (in Flirtea very elongated), with two lateral patches of type 4 microsetae not reaching the center of the VP in ventral view (Figs 5c, 8h) (in Cynorta covering the entire surface, in Eulibitia covering only lateral margins, in Flirtea smooth). VP of penis with two large MS A (Figs 5b, 11g, 14i) (in Cynorta one MS A extremely reduced, in Flirtea one MS A larger)."

Included speciesEdit

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In addition - Due to the synonymy of Metarhaucus fuscus Pickard-Cambridge, 1905 [type species of Metarhaucus] as a junior synonym of Rhaucus serripes (Simon, 1879)[1]), several other species previously in Metarhaucus are implicitly transferred to the genus, but require further revision to establish more appropriate placement.

Notes Edit

  • See false geographic records discussed in Kury 2003: 83.

ReferencesEdit

  1. 1.0 1.1 1.2 García, A.F. & Kury, A.B. (2017) Taxonomic revision of the Andean harvestman genus Rhaucus Simon, 1879 (Arachnida, Opiliones, Cosmetidae). Zootaxa, 4338 (3), 401–440. [Issued 26 Oct 2017].
  2. Kury, A. B., 2003. Annotated catalogue of the Laniatores of the New World (Arachnida, Opiliones). Revista Iberica de Aracnología, Zaragoza, vol. especial monográfico, nº 1: 1-337

Additional images - GalleryEdit