cribellum

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cribellum

[krə′bel·əm]
(invertebrate zoology)
A small accessory spinning organ located in front of the ordinary spinning organ in certain spiders.
A chitinous plate perforated with the openings of certain gland ducts in insects.
References in periodicals archive ?
Thus, in our sample, reeling occurs naturally among ecribellate, but not among cribellate orbweavers.
Nevertheless, among ecribellate orbweavers it is expressed, albeit occasionally, in natural conditions: some radii are unpredictably broken by struggling prey that leave holes in the webs, and these broken radii stand as natural pseudogumfoot lines (since the viscid spirals connect the broken radius loosely to the web).
The duration of a web building bout ranges from 3 to 5 h among the cribellate orb weavers to about 30 min among the ecribellate araneids (Lubin 1986; Zschokke & Vollrath 1995a,b).
Here, we evaluate the hypothesis that the diversification of ecribellate orb weavers may in part result from an evolutionary reduction in site tenacity that could have led to a faster and more opportunistic exploitation of unpredictable resources, thus facilitating the diversification in the clade.
We chose Zosis geniculata Olivier 1789 (Uloboridae) and Metazygia rogenhoferi Keyserling 1878 (Araneidae) as representatives of the cribellate and ecribellate orb weavers, respectively.
geniculata is more tenacious than the ecribellate M.
rogenhoferi contradict previous studies with ecribellate orb weavers.
Although recluse spiders are ecribellates, their silk is dry and shares several characteristics of cribellate silk (Knight & Vollrath 2002); hence, prey capture is via entanglement not adhesion.