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Line drawings of cystacanth male holotype of Heterospinus mccordi n. gen. n. sp. ex Procambarus clarkii. a, rooted proboscis hooks I-VI and the characteristic smaller scythe-shaped rootless hook VII; b, proboscis; c, whole individual; d, subset of spines from foretrunk anterior spinose field; e, subset of spines from foretrunk posterior spinose field
