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Deep molecular divergence in the absence of morphological and ecological change in the Californian coastal dune endemic trapdoor spider Aptostichus simus
It is suggested that species concepts based on morphological distinctiveness, in spider groups with limited dispersal capabilities, probably underestimate true evolutionary diversity.
  • J. Bond, B. Opell
  • Biology, Medicine
    Evolution; international journal of organic…
  • 1 April 1998
Testing the hypothesis that adaptive radiation and key innovation have contributed to the diversity of the order Araneae shows that the inequality in diversity between the Deinopoidea and the AraneoideA is significant, and that it is associated with the replacement of primitive cribellar capture thread by viscous adhesive thread and a change from a horizontal to a vertical orb‐web orientation.
Adhesive recruitment by the viscous capture threads of araneoid orb-weaving spiders
This study tests the hypothesis that viscous thread overcomes this limitation by implementing a suspension bridge mechanism (SBM) that recruits the adhesion of multiple thread droplets, and measures the stickiness of six species' viscous threads whose profiles range from small, closely spaced droplets to large, widely spaced Droplets.
Economics of spider orb-webs: the benefits of producing adhesive capture thread and of recycling silk
The increased economy with which adhesive capture thread achieves its stickiness may have been an important factor that favoured the origin and success of modern orb-weaving spiders that produce adhesive capture threads.
Phylogeny and taxonomy of thegenera of south-western North American Euctenizinae trapdoor spiders and their relatives (Araneae: Mygalomorphae, Cyrtaucheniidae)
Using 71morphological characters scored for 29 mygalomorph taxa, cladistic analysis shows that Cyrtaucheniidae is likely paraphyletic with respect to the Domiothelina, the clade that comprises the Migidae,Actinopodidae, Ctenizidae, and Idiopidae.
Humidity affects the extensibility of an orb-weaving spider's viscous thread droplets
It was found that the extensibility of droplets on Larinioides cornutus threads increased as humidity increased, however, the deflection of the droplets' supporting axial lines did not change, indicating that atmospheric water uptake increases glycop protein plasticity, but not glycoprotein adhesion.
The adhesive delivery system of viscous capture threads spun by orb-weaving spiders
The results confirm that droplets at the edges of thread contact contribute the greatest adhesion, with each successively interior droplet contributing only 0.70 as much adhesion as a span of 20 droplets, regardless of the size and spacing of a thread's large primary droplets.
The role of granules within viscous capture threads of orb-weaving spiders
It is hypothesized that granules serve to anchor larger, surrounding layers of transparent glycoprotein glue to the axial fibers of the thread, thereby equipping droplets to resist slippage on the axIAL fibers as these droplets generate adhesion, elongate under a load, and transfer force to theAxial fibers.