Bioacoustics of Jaguajir

DIAGNOSIS: Jaguajir , gen. nov. , differs from all other rhopalurusine genera by the fused lateral ocular and anterior central submedian carinae of the carapace. It differs further from Centruroides , Ischnotelson , gen. nov. , Physoctonus , and Troglorhopalurus by the presence of a pecten-sternite stridulatory organ (proximal pectinal teeth, dorsal surfaces without nodules but with regular striations, sternite III, ventromedian carina elevated anteriorly, ventrosubmedian surfaces forming paired depressions, covered by large, regularly spaced acuminate granules, lateral margins forming smooth, raised carina); from Rhopalurus and Ischnotelson by the separate (unfused) central lateral and posterior central submedian carinae of the carapace; from Centruroides and Troglorhopalurus by the robust metasoma, increasing in width posteriorly (more so in the adult male); from Centruroides by the presence of macrosetae on the dorsobasal surface of the pectinal teeth; from Heteroctenus by the absence of depressions in the male pectinal plate and the presence of a subaculear tubercle on the telson; from Ischnotelson by the separate (unfused) lateral ocular and central lateral carinae of the carapace and the telson vesicle not laterally compressed; from Physoctonus by the larger size (30–70 mm), the more distinct carapacial carinae, the setose proximal dorsal fulcra of the pectines, the incrassate pedipalp chela manus of the adult male, the bifurcate prolateral pedal spur of leg I, and the oblique subrows of primary denticles on the pedipalp chela fingers flanked closely by pro- and retrolateral accessory (supernumerary) denticles; and from Troglorhopalurus by the proximal dentate margin of the chela fixed and movable fingers of the adult male emarginate, with a distinct gap evident between them, when closed.