Charinus euclidesi, Miranda & Giupponi & Prendini & Scharff, 2021

Miranda, Gustavo Silva de, Giupponi, Alessandro P. L., Prendini, Lorenzo & Scharff, Nikolaj, 2021, Systematic revision of the pantropical whip spider family Charinidae Quintero, 1986 (Arachnida, Amblypygi), European Journal of Taxonomy 772, pp. 1-409 : 110-111

Charinus euclidesi sp. nov.

urn:lsid:zoobank.org:act:CFBC1532-31B7-4BAF-B313-28D02A28179E

Figs 6C–D , 9A–B , 43 , 61–63 ; Table 4

Diagnosis

This species may be separated from other Charinus in eastern South America by means of the following combination of characters: cheliceral claw with nine teeth; males with sexually dimorphic pedipalps ( Fig. 61A–D ); pedipalp coxae with three long setae on margin, and distinct seta encircled by round carina; pedipalp femur with five dorsal spines and five ventral spines ( Fig. 61A–B ); pedipalp tibia with distinct setiferous tubercle proximally and ventral spine distally; pedipalp tarsus with three dorsal spines ( Fig. 61C–D ); leg IV distitibia sc and sf series each with six trichobothria.

This species resembles C. diamantinus sp. nov., but bears more spines on the pedipalp femur and patella.

Etymology

Patronym honoring Euclides da Cunha, one of the foremost Brazilian writers, born in the region in which this species was collected.

Type material

Holotype BRAZIL • ♂; Rio de Janeiro, Cantagalo, Gruta da Pedra Santa, Fazenda da Mineiração Mauá (Euclidelândia); 21°56′16″ S, 42°15′16″ W; 13 Nov. 2005; M.S. Silva and R.L. Ferreira leg.; MNRJ 9099 .

Paratypes BRAZIL • 2 ♀♀; same collection data as for holotype; MNRJ 9099 .

Description

CARAPACE. Frontal process large, triangular, acute, not visible in dorsal view ( Fig. 61F ); median eyes large ( Fig. 61F ); median ocular tubercle shallow, with pair of setae, posterior to eyes; lateral eyes poorly pigmented, but with tapetum ( Fig. 61A ); small seta posterior to lateral ocular triad.

STERNUM. Tritosternum projected anteriorly into long tubercle ( Fig. 61E ); median and third platelet rounded, convex, with two setae medially and few small setae posteriorly; metasternum with several small setae anteriorly and three long setae posteriorly.

OPISTHOSOMA. Ventral sacs and ventral sac cover absent.

GENITALIA. Female gonopod sucker-like, with apex of gonopods converging ( Fig. 6C–D ); posterior margin of genital operculum straight, with few setae along margin and on surface ( Fig. 6C–D ). Male gonopod with LoL2 long and fimbriate ( Fig. 9A–B ); LoD projecting posteriorly and acuminate apically ( Fig. 9A–B ).

CHELICERAE. Small retrolateral tooth on basal segment. Prolateral surface of basal segment with vertical row of seven setae. Claw with nine small teeth; retrolateral surface of claw with row of setae from base to mid-apex.

PEDIPALPS. Coxal dorsal carina with one or two small setae and four or five setae on anterior margin of round carina. Femur with three distinct setiferous tubercles proximal to spine 1 ( Fig. 62A–B ); primary series with five dorsal spines and small spine between spines 3 and 4 ( Fig. 62A–B ); five ventral spines and small spine between spines 1 and 2, two small spines between spines 2 and 3, and small spine between spines 3 and 4 and 4 and 5 ( Fig. 62C–D ); large ventral spine proximal to spine 1 ( Fig. 62C–D ). Patella with five dorsal spines and small spine between spines 4 and 5 ( Fig. 62A–B ); large setiferous tubercle distal to spine I, about one-third length of spine I; five ventral spines ( Fig. 62C–D ). Tibia with two dorsal spines, basal spine two-thirds length of distal spine; ventral spine situated in distal half of tibia, with row of two setiferous tubercles near base of spine; three long setae between spine and distal margin. Tarsus with three dorsal spines, two distal spines subequal and one-fifth length of tarsus; proximal spine smaller, ca one-third length of other two spines, situated near large proximal spine, and with long seta at base ( Fig. 61C–D ); ventral row of cleaning brush with 27 setae.

LEGS. Tibia of leg I with 23 articles; tarsus I with 41 articles; tarsal organ situated close to base of tarsal claw ( Fig. 63C, E ); rod sensilla formed by six setae in shallow groove ( Fig. 63A–B ); slit sensilla situated opposite to tarsal claw ( Fig. 63D ). Leg IV basitibia with four pseudo-articles; trichobothrium bt situated in proximal third; distal apex of basitibial pseudo-articles with dark, denticulate projection; distitibia trichobothrium bc situated closer to sbf than to bf; sc and sf series each with six trichobothria; distitarsus with distinct white annulus distally on first article.

Measurements

See Table 4 .

Distribution

Known only from the type locality.

Natural history

The known specimens were collected exclusively inside caves.

Figures

Fig. 6. Charinus Simon, 1892, female gonopods, dorsal (left column) and posterior (right column) views. A–B. Charinus renneri sp. nov. (MNRJ 9198). C–D. Charinus euclidesi sp. nov. (MNRJ 9099). E–F. Charinus carioca sp. nov. (MNRJ 9201). Scale bars: A–D = 0.25 mm; E–F = 0.1 mm.

Fig. 9. Charinus Simon, 1892, male gonopods. A–B. Charinus euclidesi sp. nov. (MNRJ 9099), ventral view (A), posterior view (B). C–D. Charinus sooretama sp. nov. (MNRJ 9245), ventral view (B), detail of sinistral side showing lamina medialis, lateral lobe 1 and 2, and dorsal lobe (D).

Fig. 43. Map plotting known distributions of species of Charinus Simon, 1892 in eastern South America, with inset for southeastern Brazil.

Fig. 61. Charinus euclidesi sp. nov. (MNRJ 9099), general morphology. A. Female habitus, dorsal view. B. Male habitus, dorsal view. C. Female pedipalp tarsal spines, dorsal view. D. Male pedipalp tarsal spines, dorsal view. E. Female sternum, ventral view. F. Male frontal process. Scale bars: A–B = 0.5 cm; C–D = 0.5 mm; E = 1 mm; F = 0.1 mm.

Fig. 62. Charinus euclidesi sp. nov. (MNRJ 9099), pedipalp. A. Female pedipalp, dorsal view. B. Male pedipalp, dorsal view. C. Female pedipalp, ventral view. D. Male pedipalp, ventral view. Scale bars: A, C = 1 mm; B, D = 0.5 cm.

Fig. 63. Charinus euclidesi sp. nov. (MNRJ 9099), antenniform leg I. A. Apex of distal article. B. Rod sensilla and olfactory setae. C. Apex of distal article of tarsus showing claw and tarsal organ. D. Detail of slit sensilla. E. Distal segment of tarsus, lateral view.