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Similar to Hexacontium armatum/hostile, except that pores on outermost shell are larger and more irregular in size and distribution. May have one medullary shell (?). It is probable that Hexacontium aristarchi is a developmental form of Cromyomma circumtextum, from which it differs by lacking the outermost, very slender and delicate fourth shell. Outermost shell diameter without spines: ca. 130 µm.

Ref.: Boltovskoy and Riedel (1980).

Hexacontium aristarchi