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Chlorophyceae - Receptaculitidae

Calathium was named by Billings (1865). Its type is Calathium formosum. It is the type genus of Calathida, Calathidae.

It was assigned to Calathidae by Church (1991); and to Receptaculitidae by Fan et al. (2002).

C. formosum (type species), C. yersini
Species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1865Calathium Billings
1991Calathium Church p. 603
2002Calathium Fan et al.

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phylumChlorophytaReichenbach 1834
classChlorophyceaeK├╝tzing 1843
familyReceptaculitidaeEichwald 1860
tribeCalathidaeNitecki 1969
genusCalathiumBillings 1865

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

S. B. Church 1991Steeply conical to goblet-shaped, some- times annulate, double-walled, commonly rooted at tapered lower end; lower stem-like base flares upward into inverted goblet- like obconical main body or cup; central cavity distinct and deep; in larger specimens, lower part of body may appear as stalk that supported upper thin-walled cup; cup usually solitary but branching may occur. Body constructed from meroms. Ap- parent two-walled body construction. Inner wall resulted from fusion of individual meroms at proximal end or "foot," inner wall perforate with pores at four corners of each foot. Individual meroms terminate distally in four-rib stellate structure; stellate ribs interlock with ribs from adjacent meroms forming outer wall with mesh-like reticulate pattern; outer wall perforate with each pore framed by interlocking stellate ribs; outer wall pores occur in 4:1 ratio to inner wall pores; interwall space or inter- vallum filled only with thin merom shafts.