Charinus ricardoi, Giupponi & Miranda, 2016

Giupponi, Alessandro Ponce de Leão & Miranda, Gustavo Silva de, 2016, Eight New Species of Charinus Simon, 1892 (Arαchnidα: Amblypygi: Chαrinidαe) Endemic for the Brαziliαn Amαzon, with Notes on Their Conservαtionαl Stαtus, PLoS ONE (e 0148277) 1892 (2), pp. 1-33 : 6-10

publication ID	https://doi.org/ 10.1371/journal.pone.0148277
DOI	https://doi.org/10.5281/zenodo.12820266
persistent identifier	https://treatment.plazi.org/id/03C48786-4461-CB48-5E51-F9A0FBBEF9CD
treatment provided by	Felipe
scientific name	Charinus ricardoi
status	sp. nov.

Treatment

Charinus ricardoi View in CoL new species. urn:lsid:zoobank.org:act:7AFD4D04-6BD2-4706-BFEE-432C366A49A5

( Figs 5A–5E View Fig 5 , 2B View Fig 2 and 3B View Fig 3 )

Etymology. This species is named after Dr. Ricardo Pinto-da-Rocha ( MZUSP, SP, BR), in recognition of his contribution to arachnology.

Type material. Holotype: BRAZIL: Amazonas : Presidente Figueiredo , Gruta Areia Branca (Areia Branca cave), 23-31.viii.2003, R. Pinto-da-Rocha leg. (1 Female, MZSP 22036 View Materials ) . Paratypes: BRAZIL: Amazonas : Presidente Figueiredo , Gruta Areia Branca (Areia Branca cave) (3 females, MZSP 22036 View Materials ) ; Gruta dos Animais ( Animais cave ), 23-31.viii.2003, R. Pinto-da-Rocha leg. (1 juvenile, MZSP 22049 View Materials ; 1 female and 1 male, MZSP 22063 View Materials ) .

Diagnosis. Absent median eyes and tubercle; weakly developed and pale lateral eyes; small and rounded meta and mesosternum; small basal spine of pedipalp distitarsus, ¼ the distal spine length; pedipalp almost perpendicular to the body, similar to that of Paracharon caecus Hansen, 1921; basitibia of leg IV divided in two pseudo articles; trichobothria of basitibia IV (bt) on the proximal third of the article; distitibia IV with 16 trichobothria; equidistant basal trichobothriae of distitibia IV (bf, bc and sbf); yellowish-brown body color; cushion-like gonopods without projections and with internal seminal receptacles; gonopods very similar to that of Charinus bonaldoi sp. n. (described below), but the pedipalp proportions and the size of the pedipalp articles are larger in C. ricardoi sp. n.

Description. Carapace ( Fig 5A View Fig 5 ): flattened, wider than long, with an anterior depression in place of the absent median eye tubercle; from this depression starts a thin median furrow that

reaches around the posterior area of the pair of lateral hump situated behind the lateral eye spots. Anterior margin with 5 to 7 small setae. Lateral eyes reduced to a small, whitish spot. Frontal process well developed, much longer than larger, with blunt, reborded apex.

Sternum ( Fig 5B View Fig 5 ). Same as C. brescoviti sp. n.

Abdomen ( Fig 5A View Fig 5 ). Same as C. brescoviti sp. n..

Chelicera. Cheliceral furrow ( Fig 2B View Fig 2 ) with 4 internal teeth, the distal one short (almost the size of the second and third teeth) and bifid; the first cusp (1a) bigger than the second (1b). Fourth twice as long as the others and stouter. Teeth length: IV>Ia>Ib = II>III. Claw with 5 denticles, decreasing in size from the basal to the distal region.

Pedipalp. Trochanter ( Fig 5D and 5E View Fig 5 ): large ventral apophysis, in the posterior border of the article, spiniform, bearing many strong setae, and with a blunt tip pointed forwards; 2 subequal spines, one on the medial third and the other on the distal tip of the prolateral face. Femur ( Fig 5D and 5E View Fig 5 ): 3 dorsal spines decreasing in size from basal to distal; some specimens have a small fourth spine; each spine is 1/3 the size of the following (I>II>III); two prominent setiferous tubercle before the first spine; 4 ventral spines (I>II>III>IV) with similar sizes of the dorsal ones. Tibia ( Fig 5D and 5E View Fig 5 ): dorsal main series with 3 spines (I>II>III); third is half the size of the second, and second is 2/3 the first; one accessory spine before the first, and no accessory spine after the third one, where is placed a small setiferous tubercle; 2 ventral spines, being the proximal half the distal. Basitarsus ( Fig 5C, 5D and 5E View Fig 5 ): 2 dorsal spines, the basal half the size of the distal. 1 ventral spine at the distal half, 2/3 the size of the distal dorsal spine. Distitarsus ( Fig 5C View Fig 5 ): 2 curved spines well developed, the distal half the size of the article and the basal 1/4 the size of the distal. Cleaning organ about ½ the article length. Claw ( Fig 5C View Fig 5 ): long, with an acute, curved tip.

Legs. Same as C. brescoviti sp. n.. Femur length I>III>IV>II. Tibia I with 21 articles (one specimen with 23). Tarsus (basitarsus+distitarsus) I with 37 articles. Leg IV: Basitibia: divided into 2 pseudo-articles, with one trichobothrium in the middle of the proximal pseudo-article, and one trichobothrium in the base of the last pseudo-article. Distitibia ( Fig 3B View Fig 3 ): 3 basal and 13 distal trichobothria (total of 16) trichobothrium bc mid-way to bf and sbf. Basitibia-distitibia length BT1>DT>BT3 = BT4>BT2. Basitarsus / distitarsus ratio 7/4, distitarsus tetramerous.

Measurements. Female (n = 3): Cephalothorax: Length: 2.61 mm (2.42–2.73), Width: 2.26 mm (2.67–3.80). Abdomen: 4.67 mm (4.4–5.0). Pedipalp: Femur: 2.30 mm (2.13–2.42), Tibia 2.29 mm (2.25–2.35), Basitarsus 2.20 mm (1.08–1.30), Distitarsus 0.87 mm (0.83–0.92), Tarsal claw 0.76 mm (0.71–0.85).

Color pattern (in alcohol). Chelicerae, pedipalps and carapace yellowish. Legs lighter colored. Abdomen pale yellow. Live animals have similar color to the preserved ones.

Genitalia. Female gonopods ( Fig 4B View Fig 4 ) cushion-like without lateral projections, and without sclerotized parts; atrium opened, with internal seminal receptacles, and several glandular openings; wall of the gonopods with an inflated aspect.