telson
telson The spike-like, terminal segment of the opisthosoma that occurs in certain chelicerates (Chelicerata), e.g. limulids and eurypterids. The prominent, backward-pointing spine at or near the rear extremity of a trilobite (Trilobita) is also called a telson, although it may or may not be the equivalent of a true telson.
telson
telson In Arthropoda, the final abdominal segment, present only in the embryo of insects.
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telson
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