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Demospongea - Tetralithistida - Theonellidae

Rhoptrum was named by Schrammen (1910) [Sepkoski's age data: K u]. It is not extant. Its type is Rhoptrum scytaliforme.

It was assigned to Lithistida by Sepkoski (2002); and to Theonellinae by Finks et al. (2004).

Synonymy list
YearName and author
1910Rhoptrum Schrammen
2002Rhoptrum Sepkoski, Jr.
2004Rhoptrum Finks et al.

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phylumPoriferaGrant 1836
classDemospongea(Sollas 1875)
subclassLithistida(Schmidt 1870)
orderTetralithistidaLagneau-Hérenger 1962
suborderTetracladinaZittel 1878
familyTheonellidaeLendenfeld 1904
subfamilyTheonellinaevon Lendenfeld 1904

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.

No diagnoses are available