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Ontogenetic changes in cribellum spigot number and cribellar prey capture thread stickiness in the spider family Uloboridae by Brent D. Opell is a Environmental Science article available to read on EtoBox.

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Uloborids produce dry cribellar prey capture thread whose surface is formed of thousands of fine, looped fibrils. These fibrils are spun from spigots on an oval spinning plate termed the cribellum and handled by a setal comb on the fourth leg termed the calamistrum. Ontogenetic studies of the triangle-web species Hyptiotes cavatus and the simple-web species Miagrammopes animotus show that increases in the number of cribellar spinning spigots are associated with increases in the stickiness of cribellar threads. For H. cavatus this relationship is similar to that determined by a previous interspecific comparison. Relative to cribellum spigot number, M. antimotus produces stickier threads than does H. cavatus. Differences in the features of these species' cribellar fibrils do not explain difference in thread stickiness. Cribellar threads produced by M. animotus have shorter, wider puffs than those produced by H. cavatus and, consequently, achieve a greater contact surface area per mm of length than do threads produced by H. cavatus. The more closely spaced cribellum spigots of M. animotus maximize the number of fibrils that contact a surface. Miagrammopes animotus also has a longer ca

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Author

Brent D. Opell

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

1995

Language

EN

Field

Environmental Science (Physical Sciences)