The combing of cribellar
silk by the prithine Misionella mendensis, with notes on other filistatid spiders (Araneae: Filistatidae).
Deinopoids produced dry cribellar capture threads like those found in the less highly organized webs of their ancestors [ILLUSTRATION FOR FIGURE 1A OMITTED], whereas araneoids replaced these with viscous adhesive capture threads [ILLUSTRATION FOR FIGURE 1 OMITTED].
Cribellar threads derive their stickiness from thousands of fine, looped fibrils that are produced by the spigots of a cribellum spinning plate located at the posterior of the spider's abdomen.
Compared to cribellar threads produced by spiders of similar size, the adhesive capture threads of araneoids: (1) reflect less ultraviolet light and are, therefore, less visible to insects (Craig et al.
Of these, we included in the analysis only cribellate families because the basal group of the Orbiculariae, the Deinopoidea, produce cribellar thread.
The axial fibers of adhesive threads are larger and, therefore, probably stronger than those of cribellar threads.
Four 3rd instar spiderlings were observed under the dissecting microscope to check for the presence of the cribellar plate and calamistrum.
8), though the cribellar plate and calamistrum were already present in 3rd instar spiderlings.
radiata, as occur in some uloborids (Eberhard 1977; Opell 1982), or that the high demand of energy involved in drawing the cribellar fibrils (Eberhard 1988) prevent young spiderlings from using this type of silk.
The webs' catching silks spun by the deinopoids are characterized by reflectance peaks in the UV and blue regions of the spectrum and are drawn from the pseudoflagelliform, paracribellar, and cribellar
glands (Kovoor 1987).
18-23): cribellar plate bipartite, each field about a quarter as wide as long and separated by a narrow seam (about 0.1 x of a field length); seam and posterior plate margin sclerotized (in male, cribellum almost as wide as in female but with nonfunctional fields).
Cribellar plate bipartite, each field about a third as wide as long and separated by a wide seam (about 0.3 x a field length); Spigots: ALS: 2 MAP spigots, mesal, adjacent, unequal; 50-60 piriform spigots; PMS: 1 mAP; 1 fused paracribellar base (5-7 spigots); 4 aciniform spigots (1 anterior); 4 cylindrical spigots; PLS: 12 aciniform spigots, distributed; 1 subapical "modified PLS" spigot; paracribellar spigots absent but at least 2 nubbins present flanking mPLS; 3 cylindrical spigots.