Status
provided by World Register of Marine Species
Argopatagus A. Agassiz, 1879 and Phrissocystis A. Agassiz, 1898 are similar in all respects other than that Argopatagus has a subanal fasciole whereas Phrissocystis does not. Mortensen (1950: p. 222) suggested that these two might be synonymous, but kept them separate pending further investigation.
Mortensen, T. (1950). A Monograph of the Echinoidea. V, 1. Spatangoida I. Protosternata, Meridosternata, Amphisternata I. Palæopneustidæ, Palæostomatidæ, Aëropsidæ, Toxasteridæ, Micrasteridæ, Hemiasteridæ, 432 pp., C. A. Reitzel, Copenhagen.
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