ectostracum

From ZooTerms (Dictionary of Invertebrate Zoology)
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ectostracum (noun; Greek ektos, outside; ostrakon, shell): (Arthropoda: Chelicerata) 1. In acarology, the outermost layer of the chitonostracum layer that when sclerotized is normally colored; stains with acid dyes

See also: chitonostracum. 2. The middle layer of integument of arachnids.