A new species of Biantidae belonging to the genus Hetemlacurbs Roewer 1912 is herein described. Heterolacurbs perezassoi aev/ species from Puerto Rico, Greater Antilles, is the second species included in the genus, and it is clearly recognized by the pair of large spiniform apophyses on area IV that does not restrain area III of the dorsal scutum, the smooth legs, femora II-IV without dorsodistal spine, its tarsal formula, sternites with small tubercles and penis that exhibits a distinctive morphology.

In the course of conducting a systematic review of the Cuban Stenostygninae (Biantidae), it has been deemed critical to review Heterolacurbs ovalis Roewer, 1912 from Togo. The habitus and the enlarged metatarsus III of males (as shown in Roewer 1912: 185, fig. 42 and 1923: 143, fig. 154) of this species, which is currently placed in the Lacurbsinae, point to a close relationship with the Caribbean Stenostygninae (Pérez-González 2007). The occurrence of taxa with morphological similarities on both sides of the Atlantic Ocean demanded a detailed study of this species, mainly its penis morphology. It needed to be tested whether H. ovalis is in fact a member of an ancestral Gondwanan lineage, or if its morphological similarities with species from the other side of the Atlantic are due to convergence.

Some of the taxonomic characters originally argued for the Cuban monotypic genus Cubacanthozomus Teruel, 2007, are unsubstantial. Others were misinterpretations of drawings given in the original description of Schizomus rowlandi Dumitresco, 1973, the only source of taxonomic information on which Teruel (2007) based the new genus. Recently a new collection of this species was made in a small cave about 350 m from one of the caves mentioned in the original description: Cueva de Majana, Baracoa municipality, Guantánamo province. On the basis of new morphological evidence found during examination of two females and a male, both the genus Cubacanthozomus and its type-species are herein redescribed. Cueva de Majana is recognized as the true type locality of C. rowlandi, which male holotype was erroneously listed as being collected in a cave from central Cuba, 600 km away. Additional data are provided on the morphology, natural history and conservation status of C. rowlandi, which is now being proposed as an endangered species.

Se registra Pseudochiridium insulae Hoff, 1964 para Cuba, constituyendo el primer registro de la familia Pseudochiridiidae Chamberlin, 1923 para esta isla de las Antillas. Se describen los ejemplares y se ofrecen datos de su variabilidad morfométrica.

The troglobitic harvestman Jimeneziella decui Avram, 1970 is known from four neighboring caves (Cueva de Majana, Cueva de los Golondrinos, Cueva Perla del Agua, and Cueva de Ma´ximo) located in eastern Cuba. We present the first ecological data on a population of this endangered species in Cueva de Ma´ximo. The sex ratio of the population estimated in the main gallery of the cave was not different from 1:1. The spatial distribution observed was uniform, and the density of individuals was 0.48 individuals/m 2 (February-March) and 0.84 individuals/m 2 (November). We describe morphological differences between the sexes and between males. Preliminary morphological and behavioral data suggests the possible existence of two male morphs in J. decui (''robust'' and ''slender'' males). The slender males possessed less developed armature on leg IV; and the chelicerae, coxa IV and femur IV were less swollen than robust males. Our observations on male-male interactions suggest that robust males are more aggressive than slender males, which never initiated an attack on robust males, but in some occasions responded to attacks from robust males. The non-aggressive behavior exhibited by robust males towards slender males also suggests that the slender morph is not only a sneaker, but potentially a female mimic, which is also consistent with the morphology of slender males. Ecological and behavioral information also suggests the possible existence of territories defended by robust males with their well-developed weapons, and the presence of females inside them.