Loxosceles pallalla

Brescovit, Antonio D., Taucare-Ríos, Andrés, Magalhaes, Ivan L. F. & Santos, Adalberto J., 2017, On Chilean Loxosceles (Araneae: Sicariidae): first description of the males of L. surca and L. coquimbo, new records of L. laeta and three remarkable new species from coastal deserts, European Journal of Taxonomy 388, pp. 1-20: 12-14

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Loxosceles pallalla

sp. nov.

Loxosceles pallalla  sp. nov.

urn:lsid:zoobank.org:act:97475BEE-48BC-4AAB-A32C-A4E165 B26973

Figs 7 View Figure , 8C View Figure , 10 View Figure


Loxosceles pallalla  sp. nov. can be distinguished from all Loxosceles  species by the small tegular base and extremely long embolus with a flattened keel in the male palp ( Fig. 7 View Figure ). Females can be recognised

by the spermathecae with two receptacles originating from the same short and curved stalk, and the inner spermathecae larger than the outer one ( Fig. 8C View Figure ).


The specific epithet means “flat” in the Aymara language, and refers to the flattened embolus of this species.

Type material


CHILE: ♂, IV Región de Coquimbo: Elqui, La Herradura , 30.48333 S, 71.6 W, 80 m a.s.l., 3 Oct. 1992, N. Platnick, P. Goloboff and K. Catley leg. ( AMNHAbout AMNH).


CHILE: ♀, Elqui , 6 km S of Cruz Grande, 29.31667 S, 71.31667 W, 5 m a.s.l., in the sand by the beach, 11 Nov. 1993, N.I. Platnick, K. Catley, M. Ramírez and R.T. Allen leg. ( AMNHAbout AMNH).


Males and females were matched because they have the same coloration and have leg formula 2413. Also, both males and females have a deviant genital morphology, not fitting in any of Gertch’s speciesgroups.Although this species may be sympatric with Loxosceles coquimbo  , the latter are easily separated by the leg formula 4213.


Male (holotype, AMNH)

Carapace orange with cephalic area red brown, lacking the dark-coloured, violin-shaped median band. Chelicerae red brown. Labium, endites and legs orange. Sternum yellow. Palpus red brown. Opisthosoma uniformly grey, with spinnerets orange. Total length 7.2. Caparace 3.4 long, 2.8 wide. Clypeus 0.4 high, with long setae in the border. Eye diameters: ALE 0.16, PME 0.16, PLE 0.18. Sternum 1.7 long, 1.4 wide. Leg I: femur 5.9, patella 1.1, tibia 6.2, metatarsus 6.3, tarsus 1.6, total 21.1. II: 7.1, 1.1, 8.2, 8.3, 1.6, 26.3. III: 5.3, 1.0, 5.0, 5.7, 1.1, 18.1. IV: 6.6, 1.1, 6.2, 7.5, 1.5, 22.9. Leg formula 2431. Palpal femur 2.2 long, 0.4 wide. Palpal tibia 1.1 long, 0.8 wide. Palp with short cymbium, half the length of tibia, tibia short, enlarged ( Fig. 7A–B View Figure ); tegular base as large as the cymbium, embolus extremely long, coiled near base and flattened in all extension, except the slender tip ( Fig. 7C–D View Figure ).

Female (paratype, AMNH)

Colour as in male. Total length 8.6. Caparace 3.3 long, 3.0 wide. Clypeus 0.4 high, as in male. Eye diameters: ALE 0.16, PME 0.16, PLE 0.16. Sternum 1.8 long, 1.5 wide. Leg I: femur 5.4, patella 1.2, tibia 5.7, metatarsus 5.3, tarsus 1.3, total 18.9. II: 6.0, 1.2, 6.2, 6.1, 1.4, 20.9. III: 5.2, 1.1, 4.6, 4.9, 1.2, 17.0. IV: 5.9, 1.2, 5.6, 6.3, 1.4, 20.4. Leg formula 2413. Palp tarsus 1.3 long, narrow. Spermathecae small, positioned farther apart, without a single sclerotised base ( Fig. 8C View Figure ).


Known only from the Coquimbo Region, Chile ( Fig. 10 View Figure ).


American Museum of Natural History