Bioacoustics of Urupelma atarraz

Distribution Known only from the type locality ( Figure 76 ). MALE (MUSM-ENT 0508428): ( Figures 39–41 ) Total length: 19.24, carapace length 9.47, width 7.69, chelicerae with 12 teeth on promargin. Anterior eye row procurved, posterior eye row recurved. Eye sizes and interdistances: ( Figure 39D ) AME 0.34 (circular), ALE 0.46 (oval), PME 0.31 (oval), PLE 0.36 (oval), AME-AME 0.15, AME-ALE 0.06, PME-PME 0.58, PME-PLE 0.10, ALE-PLE 0.10, AME-PME 0.07, OQ length 0.75, width 1.44. Ocular tubercle length 1.09, width 1.44, clypeus absent. Fovea transverse, slightly procurved, width 1.64, 6.00 from anterior edge of carapace. Labium length 1.23, width 1.88, anterior quarter with 24 cuspules, maxillae with 111–119 cuspules in basal half. Maxillae without spiniform setae. Sternum length 4.67, width 4.01, three pairs of sternal sigilla located near coxae III (length 0.35, 0.43 from edge of sternum), coxae II (length 0.25, 0.27 from edge of sternum) and coxae I (length 0.16, 0.21 from edge of sternum). Leg formula: IV> I> II> III. Incrassate leg segments: slightly incrassate femur III. Maxillary and trochanteral stridulatory bristles absent. Scopulae: All tarsi 100% densely scopulate, metatarsi I 25%, metatarsi II 30%, metatarsi III 20%, metatarsi IV 10% scopulate. Tarsal scopulae I divided by a longitudinal line of setae, tarsal scopulae II–III divided by a narrow longitudinal band of setae, tarsal scopulae IV divided by a wide longitudinal band of setae. Dorsal face of all tarsi and cymbium with two irregular longitudinal rows of very short claviform trichobothria. Denticulation of paired tarsal claws on right leg (prolateral/retrolateral row): I 3/2, II 3/3, III 3/4, IV 2/3. Plumose setae on retrolateral face of femur IV absent. Spination: femora I d 0-1-1, II d 0-1-2, III d 0-0-1, IV d 0-0-1 and femora of palps d 0-0-1; patellae I 0, II 0, III p 0-0-1, IV 0 and patellae of palps 0; tibiae I v 2-1-1 (apical), p 0-0-1, II v 3- 2-3 (apical), p 1-0-1, III v 2-1-3 (apical), p 2-0-2, r 1-0-1, IV v 3-2-2 (apical), p 1-0-1, r 0-0-1 and tibiae of palps p (0–1)-2-(0–1); metatarsi I v 1-1-2 (apical), p 0-1-0, II v 2-1-2 (apical), p 0-1-1, III v 3-2-3 (apical), p 1-1-1-1, r 0-1-2, IV v 3-2-4 (apical), p 1-1-1-1, r 0-1-1, tarsi I–IV and tarsi of palps 0. Palpal organ as in Figure 41 , embolus short and stout with three keels, triangular PI keel, transparent A keel and R keel, sperm pore is between PI and A keel. Tegulum with short basal apophysis. Retrolateral lobe of cymbium covered with short spiniform setae. Retrolateral face of palpal tibia with indistinct subapical protuberance covered with numerous spiniform setae ( Figure 40B ). Two unequal subapical apophyses are present on tibia I ( Figure 40A ): a longer retrolateral tibial apophysis with short apical spine, a shorter prolateral tibial apophysis with single, retrolateral spine reaching the apex. Metatarsus I not sigmoidly curved and without basal or median protuberance on retrolateral face. When flexed, metatarsus I contacts the retrolateral side of retrolateral tibial apophysis. Abdomen ( Figure 39C ): urticating setae of type III and IV, including setae of intermediate morphology, are located in a central patch. Size of the patch: length 5.80, width 5.40. PLS: length 3.44, basal segment 1.09, middle segment 0.91, apical segment 1.44, all digitiform. PMS: 0.81. Colouration and covering setae: dorsal view: carapace and chelicerae brown, coxae, trochantera brown, femora black intermixed with long pale setae, patellae, tibiae, metatarsi and tarsi brown. Patellae I, II and palpal patella with two equal longitudinal stripes without covering setae, patellae III, IV with two unequal diagonal stripes without covering setae. Abdomen brown, except for central dark brown patch. Ventral view: laqbium, maxillae, coxae, sternum and trochantera brown, legs brown, abdomen yellowish brown. Spinnerets yellowish brown. FEMALE: unknown.