Revision of the acutidens group of Mago (Araneae: Salticidae: Amycinae) Author Patello, Thyago J. C. Author Ruiz, Gustavo R. S. text Zootaxa 2014 3786 4 443 457 journal article 45997 10.11646/zootaxa.3786.4.3 a49ede07-03df-4174-99f6-47843af3fe76 1175-5326 250259 5FAA040D-61E6-4ED2-886A-19AD03E0FCB8 The acutidens group of Mago (newly proposed) Diagnosis. Species of this group are promptly recognized among the other Mago by the RTA bearing two linked branches in the male palp: one more ventral, which is a roundish lobe along the axis of the palp, and one more dorsal and perpendicular to the axis of the palp, which is a short and acute apophysis pointing dorsally ( Figs 11– 12 ). The embolus emerges proximally at the prolateral tegulum and has an intumescence that fits into a concave portion of the tegulum; the embolus can bear projections on its median portion and is thin distally ( Figs 7–10 , 13– 16 ). Also, while most species of Mago have lost the amycine mastidia of the male chelicerae, the species of the acutidens group have kept them (see Figs 17–18 ). Description of common features. Male with reddish brown carapace, dorsally with white scales between the two AME and laterally between the ALE and the PLE ( Figs 1, 4, 5 ). Female with orange cephalic area and yellow thoracic area ( Fig. 3 ). Clypeus with sparse white scales in males ( Fig. 5 ). Chelicera brown, with several small promarginal teeth and a large pluridentate tooth on retromargin in both sexes ( Figs 19–20 ). Labium and endite brown and sternum yellowish in both sexes ( Fig. 2 ). Male palp with coxa, trochanter, proximal and medial femur brown, distal femur and patella yellow. Female palp yellow, with tibia and tarsus darker. Male leg I with all articles reddish brown. Leg II with coxa, trochanter and proximal and medial femur yellow; distal femur, patella, tibia, metatarsus and tarsus reddish brown. Legs III and IV with the same color pattern as II; IV with median tibia yellow ( Fig. 1 ). Female with all legs yellow ( Fig. 3 ). Leg spines in both sexes: femur I d1-1-1, p0-0-2, r0-0-1; II d1-1-1, p0-0-2, r0-0-2; III d1-1-1, p0-1-2, r0-0-1; IV d1-1-1, p0-0-1, r0-0-1; patella I–II p1, r0; III–IV p1, r1; tibia I–II p1- 0-1, v2-2 -2; III p1-0-1, r1-1-1, v1 p-0-2; IV p0-1-1, r1-1-1, v1 p-0-2; metatarsus I–II v2-2 ; III p1-0-2, r1-0-2, v2 -0- 2; IV p1-0-2, r1-1-2, v1 p-0-1r. Abdomen with the dorsal pattern described for the genus (see generic diagnosis) in both sexes; ventrally with a wide dark brown longitudinal stripe in both sexes ( Fig. 2 ). Female with two separate copulation openings on the epigynal plate and two pockets on posterior border separate by a median notch ( Fig. 32 ); internally with small glands ( Figs 21–22 ) on short copulation ducts, leading to undifferentiated, posterior spermathecae, from which fertilization ducts emerge. Spinnerets mostly dark brown. List of species within the acutidens group : 1– Mago acutidens Simon, 1900 . 2– Mago jurutiensis sp. nov. 3– Mago delicatus sp. nov. 4– Mago balbina sp. nov. 5– Mago similis sp. nov. 6– Mago longidens Simon, 1900 .