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The two species are very similar, and can be crossed artificially, although hybrids are unlikely to occur in the wild since their ranges do not overlap. The two species can be distinguished by a number of characteristics:
*The rostrum of H. americanus bears one or more spines on the underside, which are lacking in H. gammarus.
*The spines on the claws of H. americanus are red or red-tipped, while those of H. gammarus are

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