Charinus alagoanus

Natural history Found under fallen tree trunks and stones in tropical forest.

Description CARAPACE. Carina ventral to lateral eyes, closer to carapace margin; frontal process large, subtriangular, not visible in dorsal view (Fig. 44 C). Median eyes and median ocular tubercle present (Fig. 44 C); median tubercle shallow, slightly higher than carapace surface, with pair of small setae; lateral eyes well developed, pale, small seta posterior to each lateral ocular triad. STERNUM. Tritosternum projected anteriorly into small blunt tubercle, surpassing base of pedipalp coxae, with typical setation (Fig. 44 B); medial platelet (tetrasternum) and third platelet (pentasternum) with single convex platelet, with pair of large setae anteriorly, and several small setae posteriorly; metasternum with anterior setae in membranous region; two or three setae, forming longitudinal row, posteriorly. OPISTHOSOMA. Ventral sacs and ventral sac cover absent. GENITALIA. Female genital operculum slightly convex (Fig. 45 B), with several setae on surface and along margin (Fig. 45 A – C); sucker-like gonopods unsclerotized basally (Fig. 45 A); gonopods with dorsal projection on retrolateral side (Fig. 45 D – E); laterodistal margin of genital operculum with slit sensilla ventrally (Fig. 45 F). Male unknown. CHELICERAE. Small tooth in retrolateral row of basal segment (Fig. 10 H); prolateral surface with row of around seven small setae, from ventral to dorsal surface; two setae, prolateral and retrolateral on dorsodistal border margin near membranous region of claw; claw with eight teeth and row of setae only present medially on retrolateral surface (Fig. 10 G – H). PEDIPALPS. Coxa with one or two small setae on rounded carina and three setae on anterior margin. Femur with three distinct setiferous tubercles proximal to spine 1 (Fig. 44 E); primary series with four dorsal spines and three ventral spines (Fig. 44 E – F); large ventral spine proximal to spine 1. Patella with four dorsal spines (Fig. 44 E); large setiferous tubercle distal to spine I, about one-third length of spine I; three ventral spines decreasing in size (Fig. 44 F); setiferous tubercle between spine I and distal margin. Tibia with two dorsal spines; ventral spine in distal half; two long setae between spine and distal margin. Pedipalp tarsus with two dorsal spines, proximal spine half length of distal spine (Fig. 44 D). Cleaning brush with 32 – 36 setae. LEGS. Tibia of leg I with 23 articles; tarsal organ situated near base of tarsal claw (Fig. 46 A, C – D); rod sensilla composed of four setae in shallow groove (Fig. 46 B, E); tarsus I with 41 articles. Leg IV basitibia with three pseudo-articles; trichobothrium bt situated medially on article; 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 four trichobothria; distitarsus with distinct white annulus distally on first article. Measurements See Table 4.

urn: lsid: zoobank. org: act: 0109 E 9 FB- 0 C 24 - 436 A-A 96 C- 8 B 5 B 530 F 0 AD 2 Figs 10 G – H, 43 – 46; Table 4

Diagnosis This species may be separated from other Charinus in eastern South America by means of the following combination of characters: median and lateral eyes present (Fig. 44 A); cheliceral claw with eight teeth (Fig. 10 G – H); tibia of leg I with 23 articles, tarsus I with 41 articles; leg IV basitibia with three pseudoarticles; distitibia sc and sf series each with four trichobothria.

Distribution Known only from the type locality.

Etymology Adjective refering to the Brazilian state of Alagoas in which the type locality is located.

Type material Holotype BRAZIL • ♀; Alagoas, Murici, Estação Ecológica de Murici; 09 ° 18 ′ 23.58 ″ S, 35 ° 56 ′ 50.53 ″ W; 26 – 29 Jul. 2012; C. S. Costa, D. M. C. de Alcântara, P. de S. Dias and S. S. Nihei leg.; MNRJ 9294. Paratype BRAZIL • 1 ♀; Alagoas, Murici, Estação Ecológica de Murici, UFAL, Barranco; 09 ° 15.186 ′ S, 35 ° 51.017 ′ W; 200 m a. s. l.; 17 Aug. 2006; MNRJ 9295.