cryptic
In biology to refer to an organism or individual tending to conceal or camouflage itself, usually by some phenotypic or morphological means.
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Ichthyological terms, not general ones.
sibling species
One of two or more very closely-related species that are reproductively isolated from one another but almost indistinguishable in morphologically and/or behaviourally. May occur sympatrically and even interbreed but are incapable of producing fertile hybrid offspring. Sometimes referred to as cryptic species.
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