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searchable PDF - Association for Mexican Cave Studies

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great many species of North America as well as thetype of the genus, Cicurina cicur (Fabricius) ofEurope. The subgenera Cicurina and Cicurusta havefurther modified it by development of a bursal bulb,a secondary spermathecum, and further elongationand complication of the connecting coils.The present revision deals only with the taxa assignedto the subgenus Cicurella and comprehends agrowing number of closely allied <strong>for</strong>ms so far equalin number to those of all the other subgenera. Noexotic taxa are known and it seems to be an exclusivelyAmerican group. In basic features Cicurelladiffers from Cicurina only in the subdivision of thespermathecum by development of a blind sac, insome cases of sizable dimension, at the base of theprinciple body. The fertilization duct runs from theprinciple body of the spermathecum into the atrium.The entire epigynum is covered by a thin sclerotizedsheet with only a single transverse opening, theatrium, in front of the genital orifice. In the varioustaxa the atria are typically narrow in width andshape but offer some detail <strong>for</strong> specific sorting ofthe taxa. The lightly sclerotized areas of the externalepigynum may show internal details rather clearly orthey may be largely undetailed or invisible, makingnecessary clearing with clove oil or other agents.The ventral (internal) view of the epigynum oftenbrings out details of size, proportion, separation ofparts, and good understanding of the whole structure.Each side of the epigynum is essentially a mirrorimage of the other but not rarely details of oneside may be modified by positional changes. Both•• ••• •• •• •••Map I.-Distribution of eyed Cillcurina (Cicllrella) spp.83

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