Referring to fish or other aquatic animals lacking a typical tail fin, or having a reduced tail structure.
From de- (lacking) + Greek 'phykos' (seaweed, algae) + Latin 'cauda' (tail). The term combines classical roots to describe fish anatomy, emerging in ichthyology (fish science) to classify unusual tail formations.
Most fish have fancy tail fins, but some odd creatures either lost theirs or never had one properly—and instead of just saying 'weird fish,' scientists created this exact word to describe the condition! It's like taxonomists refusing to say 'no tail' when they could say 'dephycercal.'
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