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Siphonolasma
Taxonomy
Siphonolasma was named by He (1978) [Sepkoski's age data: O Ashg-m]. It is not extant.
It was assigned to Streptelasmatinae by Hill (1981); and to Rugosa by Sepkoski (2002).
It was assigned to Streptelasmatinae by Hill (1981); and to Rugosa by Sepkoski (2002).