R������. Se analizó la variación temporal de la abundancia y algunos aspectos poblacionales de especies simpátricas de arañas del género Micrathena en un fragmento de BST al norte de Colombia, entre noviembre de 2012 y agosto de 2013. Se delimitó una transecta lineal de 500 m de largo por 20 m de ancho, donde se instalaron 10 puntos distanciados 50 m entre sí. En cada punto, las arañas fueron capturadas empleando la captura manual y la agitación del follaje. Se capturaron 177 individuos, distribuidos en cuatro especies. M. schreibersi fue la más abundante (141 individuos) y M. horrida, la menos común. Se observó un patrón de variación temporal en tres de las cuatro especies del género estudiadas, caracterizado por la disminución de los individuos adultos durante la época seca y su aumento durante las lluvias. Adicionalmente, se encontró una diferencia marcada en las proporciones sexuales de cada especie, así como en el tamaño entre especies. Esto último podría sugerir, en parte, un patrón de segregación de nicho como mecanismo para evitar la competencia. Dada la relación compleja entre las especies de Micrathena y los factores ambientales evaluados, su fácil identificación, visualización y captura en campo, estas arañas se convierten en potenciales bioindicadoras del estado de conservación del BST. Por esta razón se recomienda su uso en futuros estudios de impacto ambiental.[Palabras clave: arañas, neotrópico, precipitación, simpatría] A�������. Temporal variation of the abundance and some population aspects of Micrathena species (Araneae: Araneidae) in a Dry Tropical Forest (DTF) from Colombian Caribbean. The temporal variation in abundance and some population aspects of sympatric spider species of genus Micrathena in a dry tropical forest fragment in northern Colombia between November 2012 and August 2013 were analyzed. A linear transects of 500 m length and 20 m wide were delimitated, where 10 points were installed spaced 50 m. In each point, spiders were captured using manual capture and foliage agitation. 177 individuals were captured, distributed into four species, where M. schreibersi was the most abundant with 141 individuals and M. horrida the least common. A pa�ern of temporal variation was observed in three of the four species studied; characterized by decline of adult individuals during the dry season and increase during the rainy months. Additionally, a marked difference in sex ratios of each species, as well as the size between species, were found; the la�er may in part suggest a pa�ern of niche segregation as a mechanism to avoid competition. Given the complex relationship of the Micrathena species with the environmental factors evaluated, their easy identification, visualization and capture in the field, these spiders become potential bioindicators of the state of conservation of DTF, so its use is recommended in future studies of environmental impact.
Six new Colombian species of Otiothops (O. besotes sp. n., O. doctorstrange sp. n., O. chicaque sp. n., O. vaupes sp. n.) and Fernandezina (F. andersoni sp. n., F. eduardoi sp. n.) are described. Diagnostic illustrations and distribution maps are provided for all of the new species, along with new records for O. macleayi Banks, 1929 and O. amazonicus Simon, 1887 from Colombia.
2. Page 424 in Figure 35 specie name Otiothops waikana sp. n should be replace with Otiothops vaupes sp. n.
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