Urupelma atarraz, Kaderka, Lüddecke, Rezac, Rezacova and Hüsser, 2023

Radan Kaderka, Tim Lüddecke, Milan Řezáč, Veronika Řezáčová & Martin Hüsser, 2023, Revision of the Peruvian tarantula Homoeomma peruvianum (Chamberlin, 1916): description of a new genus with eleven new species and insights to the evolution of montane tarantulas (Araneae: Theraphosidae: Theraphosinae), Journal of Natural History 57 (41 - 44), pp. 1710-1824 : 1772-1778

Urupelma atarraz sp. n.

( Figures 39–41 , 79G ; Tables 15 , 24 )

Types

Male holotype ( MUSM-ENT 0508428 ) from Peru, Pasco, Villa Rica, Quebrada Atarraz, 1598 m a .s .l., April 2015, Juan Grados col .

Etymology

The specific name refers to the type locality along the Quebrada Atarraz River in the Pasco Department, Peru .

Diagnosis

The males of U. atarraz sp. n. differ from all congeners, except for U. ashaninka sp. n., U. johannae sp. n. and U. megantonianum sp. n., in the presence of urticating setae of type IV (only type III setae are present in the other congeners).

The males of U. atarraz sp. n. differ from all congeners in the presence of short and stout embolus with well-developed PI and developed R keel, PS keel is absent ( Figure 41 ). Two unequal subapical apophyses are present on male tibia I, basally fused, both with long spine. Palpal tibia retrolaterally with a cluster of short spiniform setae, the retrolateral process indistinct. Males of U. atarraz sp. n. differ from U. veronicae sp. n. and U. dianae sp. n. in having R keel developed and less developed TP in palpal bulb (weakly developed R keel and the presence of well-developed TP in palpal bulbs of U. veronicae sp. n. and U. dianae sp. n.). They differ from U. ashaninka sp. n. in the extension of urticating setae patch, more extended in U. atarraz sp. nov and less extended in U. ashaninka sp. n. ( Figures 39C and 33F ). They also differ from U. megantonianum sp. n. and U. sanctimariae sp. n. in the absence of SA keel in the palpal bulb morphology.

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.

Figures

Figure 33. Urupelma ashaninka sp. n., male holotype (MUSM-ENT 0511137) from Peru, Junín, Puerto Ocopa, 654 m a.s.l. A. Carapace, dorsal view. B. Sternum, labium, maxillae, coxae and trochantera, ventral view. C. Ocular tubercle, dorsal view. D. Labium and left maxilla, ventral view. E. Right palpal tibia, retrolateral view. F. Abdomen, dorsal view. Scale bar = 1 mm. Photo by R. Kaderka.

Figure 39. Urupelma atarraz sp. n., male holotype (MUSM-ENT 0508428) from Peru, Pasco, Villa Rica, Quebrada Atarraz, 1598 m a.s.l. A. Carapace, dorsal view. B. Sternum, labium, maxillae and coxae, ventral view. C. Abdomen, dorsal view. D. Ocular tubercle, dorsal view. E. Labium and left maxilla, ventral view. Scale bar = 1 mm. Photo by R. Kaderka.

Figure 40. Urupelma atarraz sp. n., male holotype (MUSM-ENT 0508428) from Peru, Pasco, Villa Rica, Quebrada Atarraz, 1598 m a.s.l. A. Left tibia I, prolaterally ventral view. B. Left palpal tibia, retrolateral view. Scale bar = 1 mm. Photo by R. Kaderka.

Figure 41. Urupelma atarraz sp. n., male holotype (MUSM-ENT 0508428) from Peru, Pasco, Villa Rica, Quebrada Atarraz, 1598 m a.s.l., morphology of right palpal bulb. A. Prolateral view. B. Retrolateral view. Scale bar = 1 mm. Photo by R. Kaderka.

Figure 76. Distribution map of Urupelma gen. n. from Peru. Prepared by M. Hüsser.

Figure 79. Urticating setae types found in single species of Urupelma gen. n. A–C. Urupelma megantonianum sp. n., male holotype (MUSM-ENT 0510523). D. Urupelma ashaninka sp. n., female paratype (MUSM-ENT 0511139).E–F. Urupelma ashaninka sp. n., male holotype (MUSM-ENT 0511139). G. Urupelma atarraz sp. n., male holotype (MUSM-ENT 0508428). H. Urupelma awanqay sp. n., female paratype (MUSM-ENT 0511169). Prepared by R. Kaderka.