|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Gastropoda - Xenophoridae
It was Stellaria (Onustus) by Okutaini (2000); it was reranked as Onustus by Todd (2001) and Bouchet (2015).
It was assigned to Xenophora by Ponder (1983) and Wilson (1993); to Stellaria by Okutaini (2000); and to Xenophoridae by Todd (2001) and Bouchet (2015).
|Year||Name and author|
|1840||Xenophora (Onustus) Swainson|
|1880||Tugurium Fischer p. 450|
|1896||Tugurium (Trochotugurium) Sacco|
|1897||Xenophora (Tugurium) Harris|
|1960||Tugurium MacNeil p. 47|
|1972||Tugurium Ladd p. 55|
|1977||Tugurium (Trochotugurium) Beu p. 234|
|1977||Tugurium Ladd p. 17|
|1983||Xenophora (Onustus) Ponder pp. 58 - 59|
|1993||Xenophora (Onustus) Wilson p. 169|
|2000||Stellaria (Onustus) Okutaini p. 203|
|2002||Trochotugurium Sepkoski, Jr.|
|2002||Tugurium Sepkoski, Jr.|
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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.
|W. F. Ponder 1983||Shell thin, with wide peripheral flange simple or weakly digitate, porcellanous below. Umbilicus narrow to wide, sometimes plugged with callus. Foreign objects attached to periphery on few to all whorls, small and inconspicuous, leaving most of shell surface exposed. Foot lacks sole on metapodium, mantle edge smooth, ctenidial filaments very long. Operculum radially ridged externally or almost smooth, bearing only very fine radial striae.|