What does cribellum mean?

Definitions for cribellum

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  1. cribellumnoun

    A spinning organ having many fine pores, situated in front of the spinners in some spiders.

    Etymology: From cribellum, diminutive of cribrum ‘sieve’.

Webster Dictionary

  1. Cribellumnoun

    a peculiar perforated organ of certain spiders (Ciniflonidae), used for spinning a special kind of silk

    Etymology: [L., a small sieve, dim. of cribrum sieve.]


  1. Cribellum

    The cribellum is a silk spinning organ found in certain spiders. Unlike normal spinnerets, the cribellum consists of one or more plates covered in thousands of tiny spigots. These spigots produce extremely fine fibers which are combed out by the spider's calamistrum, producing silk with a wooly texture. The fibers are so small in diameter that prey insects easily become entangled in them, without any glue needed. The spiders then bite them before they can escape. The cribellum is a functional homolog of the anterior median spinnerets of Mesothelae and Mygalomorphae, which do not have a cribellum. The presence or absence of a cribellum is used to classify araneomorph spiders into the cribellate and ecribellate type. The distinction can be used to study evolutionary relationships. However, in 1967 it was found out that there are many families with both cribellate and ecribellate members. It is today believed that the precursor of all Araneomorphae was cribellate, and that this function was lost in some araneomorph spiders secondarily. Many of these still retain a colulus, which is thought to be a reduced cribellum, and is of unknown function. However, some "ecribellate" spiders seem to have evolved independently, without cribellate precursors.

Chambers 20th Century Dictionary

  1. Cribellum

    kri-bel′um, n. an accessory spinning-organ of certain spiders—also Cribrell′um:—pl. Cribell′a.

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  1. Chaldean Numerology

    The numerical value of cribellum in Chaldean Numerology is: 2

  2. Pythagorean Numerology

    The numerical value of cribellum in Pythagorean Numerology is: 5

Images & Illustrations of cribellum

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