Etymology: The specific name means “huge” in Latin. The specimen was found with a label written by Brazilian arachnologist, Cândido Mello-Leitão, stating “Phormictopus grandis, typus”. However, the species has remained unpublished until now.
Two new species of Pamphobeteus Pocock 1901 are described from Brazil: Pamphobeteus crassifemur sp. nov. and
Pamphobeteus grandis sp. nov.; Pamphobeteus nigricolor, formerly described from Colombia, Ecuador and Bolivia, is
recorded from Brazil and its distribution in Ecuador and Bolivia is questioned. A new type of stridulatory organ is
described from legs III and IV of P. crassifemur sp. nov. The structure consists of spiniform setae. Stridulation occurs
when the spider moves the legs III and IV, sometimes while shedding urticating hairs.