Bioacoustics of Urupelma megantonianum

Distribution and natural history Known from the type locality in Peru , Cusco , Megantoni ( Figure 76 ) . The habitat was an amazonic forest dominated by bamboo of the genus Guadua Kunth. The specimen was collected in a pitfall trap. MALE (MUSM-ENT 0510523): ( Figures 42–44 ) Total length: 15.74, carapace length 8.45, width 6.55, chelicerae with 11 teeth on promargin. Anterior eye row slightly procurved, posterior eye row recurved. Eye sizes and interdistances: ( Figure 42D ) AME 0.32 (circular), ALE 0.42 (oval), PME 0.26 (oval), PLE 0.29 (oval), AME-AME 0.10, AME-ALE 0.09, PME-PME 0.49, PME-PLE 0.05, ALE-PLE 0.09,AME-PME 0.10,OQ length 0.66, width 1.31. Ocular tubercle length 0.99, width 1.31, clypeus absent. Fovea transverse, deep, procurved, width 1.23, 5.45 from anterior edge of carapace. Labium length 0.96, width 1.56, anterior third with 32 cuspules, maxillae with 142–152 cuspules in basal half, apical half without short spiniform setae. Sternum domed, length 3.91, width 3.07, three pairs of sternal sigilla located near coxae III (length 0.34, 0.31 from edge of sternum), coxae II and coxae I. Leg formula: IV> I> II> III. Incrassate leg segments: femur III. Maxillary and trochanteral stridulatory bristles absent. Scopulae: All tarsi 100% densely scopulate, metatarsi I 40%, metatarsi II 40%, metatarsi III 20%, metatarsi IV 5% scopulate. Tarsal scopulae I, II undivided, tarsal scopulae 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 3/3, II 2/2, III 2/2, IV 3/3. Plumose setae on retrolateral face of femur IV absent. Spination: femora I p 0-0-1, II p 0-0-1, III d 0-0-1, IV d 0-0-1 and femora of palps d 0-0-1; patellae I–IV and patellae of palps 0; tibiae I v 1-1-1 (apical), II v 2-1-3 (apical), p 0-0-1, III v 2-2-3 (apical), p 1-2-1, r 1-0-1, IV v 3-3-3 (apical), p 1-1-1-1, r 1-1-0 and tibiae of palps p 0-0- 1; metatarsi I v 0-0-2 (apical), p 0-1-0, II v 1-1-2 (apical), p 0-1-0, III p 2-3-3 (apical), p 1-2-1, r 0-1-1, IV v 2-3-3 (apical), p 2-1-2-2 (apical), r 1-1-1-1-1, tarsi I–IV and tarsi of palps 0. Palpal organ as in Figure 44 , embolus short and stout with four keels, PI, A, SA and R keel, PI keel is subtriangular, A keel transparent, SA keel weakly developed and ending at tegulum. Sperm pore is between PI and A keel. Retrolateral lobe of cymbium covered with short spiniform setae. Retrolateral cymbial lobe is distinctly larger than prolateral one. Retrolateral face of palpal tibia with indistinct subapical protuberance thinly covered with spiniform setae ( Figure 43A ). Two unequal subapical apophyses are present on tibia I ( Figure 43B ): a longer retrolateral tibial apophysis with apical spine, a shorter prolateral tibial apophysis with single, retrolateral spine overreaching 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: urticating setae of type III, IV and setae of intermediate morphology are located in a central patch (abdomen damaged). PLS: length 2.60, basal segment 1.04, middle segment 0.65, apical segment 0.91, all digitiform. PMS: 0.70. Colouration and covering setae: dorsal view: carapace and chelicerae brown, coxae, trochantera brown, femora dark brown, patellae, tibiae, metatarsi and tarsi brown. Patellae I, II, palpal patella, femora III and IV with two equal longitudinal stripes without covering setae, patellae III, IV with two unequal diagonal stripes without covering setae. Abdomen brown. Ventral view: labium reddish brown, sternum, maxillae, coxae, trochantera yellowish brown, femora dark brown, the rest of legs brown, abdomen yellowish brown. Spinnerets yellowish brown. FEMALE: unknown.