Auyantepuia manmandinan Ythier, Chevalier, Moreau & Murienne, 2026, sp. nov.

Auyantepuia manmandinan sp. nov. urn:lsid:zoobank.org:act: 6E965380-4431-446E-A520-BFA04F32E815 Figs 15–24 Diagnosis Species of medium size when compared with the average size of the other species of the genus, with a total length ranging from 21–23 mm in males (n= 2) and 21–25 mm in females (n= 2) (see morphometric values in the description). General coloration reddish brown, with carapace, chelicerae, pedipalps and legs marked with darker spots. Tergites brownish with confluent yellowish spots on the sides and the middle of tergites, forming a longitudinal median stripe. Ventral side of metasomal segments I and II yellowish, without spots. Body and appendages weakly to moderately granulated; metasomal tegument with lateral sizes covered with medium size granulation on segments III to V in male, smooth in female; medium size granulation on ventral side of segments III to V in both sexes, spinoid on V; chela manus dorsal and internal surfaces smooth in both sexes, dorso-internal carina weakly marked. Pectinal tooth count ranging from 7– 7 in males (n=2) and 6–7 in females (n=2; mean =6). Trichobothrial pattern of type C neobothriotaxic ‘majorante’. Etymology The specific name is a noun placed in apposition to the generic name and refers to the French Guianese creole name for the white-faced saki monkey, Pithecia pithecia (Linnaeus, 1766). The specific name also refers to the Manmandinan Lodge, where the new species was collected. Material examined Holotype FRENCH GUIANA • ♂; Toussaint River, Manmandinan Lodge; 5.35482° N, 53.00532° W; under wood log on the ground; 10 Aug. 2021; J. Chevalier leg.; MNHN, JCAUTOU22. Paratypes FRENCH GUIANA • 1 ♀; Toussaint River, Manmandinan Lodge; 5.35482° N, 53.00532° W; under wood log on the ground; 10 Aug. 2021; J. Chevalier leg.; MNHN, JCAUTOU22 • 1 ♀; same data as for preceding; JCPC • 1 ♂; same data as for preceding; EYCP, EY0404. Description (based on male holotype and adult males and females paratypes) COLORATION. General coloration reddish brown. Carapace reddish yellow, marked with brownish variegated spots around the ocular tubercle and on the anterior and posterior edges of the carapace; ocular tubercle darker, almost black. Tergites brownish with confluent yellowish spots on the sides and the middle of tergites, forming a longitudinal median stripe. Venter yellowish. Metasomal segments reddish yellow, marked with variegated brownish spots on lateral and dorsal sides of segments I to V and on ventral side of segments III, IV and V; ventral side of segments I and II yellowish, without spots. Vesicle reddish yellow with basis of aculeus blackish and tip of aculeus reddish. Chelicerae yellowish with variegated dark brown spots; fingers yellowish with dark brown spots at their basis, teeth reddish. Pedipalps reddish yellow, with longitudinal dark brown spots. Legs yellowish, intensely marked with brownish spots. MORPHOLOGY. Carapace acarinate, with some fine granulations on central, lateral and posterior parts; furrows shallow; anterior edge emarginated. Tergites acarinate, with some fine granulations over the entire surface in male, smooth with few scattered granules on their posterior edge in female. Sternum pentagonal, wider than long. Pectinal tooth count ranging from 7– 7 in males (n=2) and 6–7 in females (n =2; mean 6), fulcra absent. Sternites smooth and shiny, VII acarinate; spiracles rounded in shape. Only metasomal segments IV and V longer than wide; metasomal tegument with lateral sides covered with medium size granulation on all segments in male, smooth in female; medium size granulation on ventral side of segments IV – V in male, only on segment V in female, these granules are spinoid on segment V; carinae on segments I– V vestigial, only lateral supramedian carinae are weakly marked on all segments. Pedipalp femur with dorsal internal, dorsal external and ventral internal carinae moderately marked, internal face weakly granular, other faces smooth; patella smooth, with all carinae vestigial; chela manus dorsal, internal and ventral surfaces smooth in both sexes; dorso-internal carina weakly marked; dentate margins on fixed and movable fingers with six rows of granules. Trichobothrial pattern of type C neobothriotaxic ‘majorante’; patella with external trichobothrium et 2 distal or at same level to et 1 and est 5 distal to et 6. Chelicerae with dentition typical of the family Chactidae (Vachon 1963), and with dense setation ventrally and internally. MORPHOMETRIC VALUES (in mm) OF THE MALE HOLOTYPE AND ONE FEMALE PARATYPE. Total length including telson, 20.69/22.56. Carapace: length, 3.16/3.72; anterior width, 1.63/1.63; posterior width, 3.12/3.77. Mesosoma length, 6.05/6.28. Metasomal segments: I: length, 1.12/1.35; width, 2.00/2.33; II: length, 1.35/1.63; width, 1.77/1.95; III: length, 1.53/1.81; width, 1.72/1.95; IV: length, 1.81/2.09; width, 1.67/1.86; V: length, 2.79/3.26; width, 1.58/1.67; depth, 1.30/1.30. Telson: length, 2.88/2.42; width, 1.44/1.40; depth, 1.16/0.98. Pedipalp: femur length, 1.86/2.33, width, 0.88/1.07; patella length, 2.33/2.79, width, 1.12/1.30; chela length, 4.42/5.12, width, 1.58/1.91, depth, 1.81/2.51; movable finger length, 2.37/2.79. Comparisons Auyantepuia manmandinan sp. nov. is morphologically more similar to A. aluku reported from Crevette River (Apatou) and the Natural Reserve La Trinité and with A. kwata sp. nov. described from Abounami River (Gros Saut) and Papaïchton. These two species can however be distinguished from A. kwata by the following main features: - Auyantepuia aluku: (i) ventral side of metasomal segments I–II yellowish, without spots (segments I to III without spots in A. aluku), (ii) medium size granulation on ventral side of metasomal segments IV – V in male (granulation on segments III to V in A. aluku), (iii) both sexes with chela manus dorsal surface smooth (weakly granulated on distal half in A. aluku) and internal surface smooth (almost smooth, with few scattered granules in male A. aluku). - Auyantepuia kwata sp. nov.: see comparisons in description of A. kwata. Moreover, the molecular analysis performed on the mitochondrial genome of the new species shows substantial genetic divergence compared to A. aluku and A. kwata sp. nov. Distribution Auyantepuia manmandinan sp. nov. is known from its type locality in Toussaint River and has also been reported from a close site in Sinnamary, in northern French Guiana (Fig. 4).