Harpago chiragra has a very thick, robust and heavy shell, with a distinct anterior notch. Its most prominent characteristic are the six long and curved marginal digitations, expanded from the flaring, thick outer lip and canals. The columella and aperture are lirate.
Sexual dimorphism is strongly present in this species. Female individuals are usually much larger than the male ones. Some named Harpago arthriticus are most likely just smaller male specimens of this species.
I also do not think harpago rugosus is a valid species or even subspecies of this highly variable shell.
In Indian and parts of the Indian Ocean where there is dark sand or mud, the aperture of the this species is black.
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