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Calathium
Taxonomy
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); to Receptaculitidae by Fan et al. (2002); and to Soanitidae by Li et al. (2015).
It was assigned to Calathidae by Church (1991); to Receptaculitidae by Fan et al. (2002); and to Soanitidae by Li et al. (2015).
Species
C. formosum (type species), C. yersini
Species lacking formal opinion data
Synonymy list
Year | Name and author |
---|---|
1865 | Calathium Billings |
1991 | Calathium Church p. 603 |
2002 | Calathium Fan et al. |
2015 | Calathium Li et al. pp. 91 - 93 |
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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.
G. †Calathium Billings 1865
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†Calathium formosum Billings 1865
†Calathium yersini Church 1991
Diagnosis
Reference | Diagnosis | |
---|---|---|
S. B. Church 1991 | Steeply 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. |