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A new monotypic genus of the subfamily Theraphosinae Thorell, 1869 is described from the Western Cordillera of the Andes in northern Ecuador. The new genus is diagnosed by its distinctive male palpal morphology, including a semi-spatulate bulb caused by a well developed retrolateral inferior keel, presence of a cymbial apophysis, absence of a tibial apophysis, and a new character described in this contribution as a retrolateral tegular process. We comment on the similarities in male palpal bulb morphology with other neotropical genera and provide a preliminary phylogenic placement based on morphology. [ABSTRACT FROM AUTHOR]

A new dictynid species of the genus ThallumetusSimon, 1893 with a highly modified male palpal patella and tibia, combined with a unique shape to the epigyne, is described from Ascension Island in the South Atlantic Ocean: Thallumetus ascensionensissp. nov. The new species represents the first report of of the family Dictynidae from Ascension and also the first Old World record of Thallumetus. The northernmost and southernmost limits of the family are briefly discussed. [ABSTRACT FROM AUTHOR]

Four new species of Cymbiapophysa Gabriel & Sherwood, 2020 from north-western Ecuador are described based on unique combinations of male palpal bulb and female spermathecae morphology: C. ashily sp. nov., C. matildeae sp. nov., C. otongachi sp. nov., and C. yumbos sp. nov. An updated diagnosis, key to species, and comparative plate of the male palpal bulb of previously known species, with relabelling of some keels as necessary, and evidence of a subapical keel in Cymbiapophysa species, are presented. Additionally, we provide further commentaries about cymbial morphology and male palpal bulb structures, and two possible hypotheses related to the origin of accessory keels. [ABSTRACT FROM AUTHOR]