Cangazomus, Pinto-da-Rocha & Andrade & Moreno-González, 2016

Pinto-da-Rocha, Ricardo, Andrade, Renata & Moreno-González, Jairo A., 2016, Two new cave-dwelling genera of short-tailed whip-scorpions from Brazil (Arachnida: Schizomida: Hubbardiidae), Zoologia (e 20150195) 33 (2), pp. 1-9 : 6

Cangazomus gen. nov.

Figs. 4-6 , 9-11 , 18-20 , 26

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Type species. Cangazomus xikrin sp. nov., by monotypy.

Diagnosis. Cangazomus gen. nov. most closely resembles Naderiore gen. nov., Adisomus Cokendolpher & Reddell, 2000 , and Piaroa Villarreal, Tourinho & Giupponi, 2008 , sharing with them the following characters: (1) four-segmented female flagellum, (2) male flagellum sub-rhomboidal shaped (only some Piaroa species), (3) absence of dorsal eminences on the male flagellum, (3) absence of gonopod in the spermathecae, (4) presence of chitinized arch in the spermathecae, (5) absence of posterodorsal abdominal process on the segment XII, and (6) absence of a single well-developed accessory teeth in the chelicerae. Cangazomus differs from all of them by the presence of two pairs of ramified spermathecal lobes, each composed of a differentiated stalk and distoterminal ramified bulbs ( Fig. 20 ), chitinized arch without AB and notched LT ( Fig. 20 ), pedipalps unarmed and not sexually dimorphic ( Fig. 18 ), and the male flagellar setae Dm 3 as microsetae ( Figs. 4-6 ).

Etymology. In reference to the canga, ferruginous breccias that covers the banded iron formation (BIF), where is located the cave from the type locality, and zomus, part of the name Schizomus . Gender masculine.

Remarks. The spermathecal lobes with ramified bulbs displayed by Cangazomus xikrin ( Fig. 20 ) are a very novel condition among the Neotropical genera of Hubbardiidae ; among the New World four-segmented genera, the North American genus Hubbardia Reddell & Cokendolpher, 1995 , and the Caribbean genus Luisarmasius Reddell & Cokendolpher, 1995 share both an apparently similar spermathecal morphology, having spermathecae composed of more than three lobes in each side (REDDELL & COKENDOLPHER 1995: 75, 81); however, the presence of multiple spermathecal lobes is a very distinct condition, compared with the presence of two pairs of lobes, each with ramified bulbs, exhibited by C. xikrin ( Fig. 20 ). For this reason, we believe this character represent a synapomorphy for the genus.

Figures

Figures 1-6. Male flagellum. Naderiore carajas gen. nov., sp. nov.: (1) dorsal; (2) ventral; (3) lateral. Cangazomus xikrin gen. nov., sp. nov.: (4) dorsal; (5) ventral; (6) lateral. Scale bars: 1, 3-4 = 0.1; 2, 5-6 = 0.05 mm. Note: the setae named in parentheses correspond to the nomenclature of the flagellar setation proposed by VILLARREAL et al. (2014) and MORENO-GONZáLEZ et al. (2014).

Figures 7-10. Female flagellum. Naderiore carajas gen. nov., sp. nov.: (7) ventral; (8) dorsal. Cangazomus xikrin gen. nov., sp. nov.: (9) dorsal; (10) ventral. Scale bar: 0.05 mm. Note: The setae named in parentheses correspond to the nomenclature of the flagellar setation proposed by VILLARREAL et al. (2014) and MORENO-GONZáLEZ et al. (2014).

Figures 11-13. Glandular pores: (11) Cangazomus xikrin gen. nov., sp. nov.; (12-13) Naderiore carajas gen. nov., sp. nov. Scale bars: 11 = 0.002, 12 = 0.005, 13 = 0.01 mm.

Figures 14-20. Pedipalp, chelicerae and spermathecae: (14-17) Naderiore carajas gen. nov., sp. nov.: (14) Male homeomorphic pedipalp (holotype); (15) Male heteromorphic pedipalp, paratype MZSP-68883; (16) Male chelicerae, holotype: top-movable finger, bottom-fixed finger; (17) female paratype spermathecae, MZSP-65724; (18-20) Cangazomus xikrin gen. nov., sp. nov.: (18) male pedipalp, holotype; (19) male chelicerae, holotype: top-movable finger, bottom-fixed finger; (20) female paratype spermathecae. Scale bars: 14-15, 18 = 0.20 mm; 17, 20 = 0.05 mm. (Fe1) Femur ectal 1, (Fe2) femur ectal 2, (Fv1) femur ventral 1, (Fv2) femur ventral 2.

Figures 21-26. Photographs of habitat and live schizomids: (21) view of plateau at Carajás region, limit between canga and ombrophilous vegetation types; (22-23) entrance region of a canga cave; (24) invertebrate manual collecting on ground of the interior of a canga cave; (25) live male of Naderiore carajas gen. nov., sp. nov. on ground; (26) live female of Cangazomus xikrin gen. nov., sp. nov. on ground. Photos: (21-24) Renata de Andrade, (25) Igor Cizauskas, (26) Marcus Oliveira.