Bioacoustics of Megaphobema lakoi

Remark. Lasiodora lakoi was described by Mello-Leitão (1943) based on a male from Tavariá Grande, Rio Purus, Brazil . The MNRJ has a specimen with a label with the same locality and collector and the indication of “ Typus ”, but with the name “ Acanthoscurria pugnax ” (Moreira-Silva et al. 2010) . Acanthoscurria pugnax Vellard, 1924 was described 19 years before by Vellard (1924) with a male specimen from the border of the states of Minas Gerais and Bahia , in Brazil , and is now considered a junior synonym of Acanthoscurria gomesiana Mello-Leitão, 1923 ( World Spider Catalog 2023 ). It seems that Mello-Leitão identified this specimen as A. pugnax Vellard, 1924 and then realized it was a new species and honored the collector, Lako, with the new species name without replacing labels. Measurements of the specimen also agree with the description ( Silva-Moreira et al. 2010 ). The type locality is probably Tauariá Grande [ 05º34’50”S , 63º53’60”W ]( Silva-Moreira et al. 2010 ), a nowadays still a remote small locality on the border of Rio Purús belonging to Tapauá in the state of Amazonas, Brazil . The specimen is very large, covered with velvety setae and lacks stridulatory apparatus on the coxae. It has a bifid spur on leg I (Figs 293─294), and the metatarsus I, when folded, touches the retrolateral process laterally. The male palp bulb is strongly flattened laterally and has a concave/convex shape (Figs 295─296). It lacks the retrolateral keel and has additional prolateral keels. All these characters match with the diagnostic characters of the genus Megaphobema . Therefore, Lasiodora lakoi Mello-Leitão, 1943 is transferred to Megaphobema lakoi ( Mello-Leitão, 1943 ) new comb. This species seems indistinguishable from Megaphobema velvetosoma Schmidt, 1995 , but, as the Megaphobema genus remains unrevised, I prefer not to synonymize M. velvetosoma with M. lakoi .