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Billevittia
Taxonomy
Billevittia was named by Edgecombe and Ramsköld (1996).
It was assigned to Encrinurinae by Edgecombe and Ramsköld (1996); and to Encrinuridae by Adrain and Edgecombe (1997).
It was assigned to Encrinurinae by Edgecombe and Ramsköld (1996); and to Encrinuridae by Adrain and Edgecombe (1997).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Billevittia Edgecombe and Ramsköld |
| 1997 | Billevittia Adrain and Edgecombe |
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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. †Billevittia Edgecombe and Ramsköld 1996
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†Billevittia adraini Edgecombe and Ramsköld 1996
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. D. Edgecombe and L. Ramsköld 1996 | Four or five fixigenal tubercles along rachial furrow of equal size to other genal tubercles ; genal angle with blunt point ; librigenal field equal in width (tr.) to lateral border, densely covered with tubercles ; tubercles of inner row on librigenal lateral border relatively large ; hypostomal middle body strongly inflated (sag., tr.) ; maculae weak ; pygidium with 9-10 rachial rings (may be a few more in terminal piece), usually 81 pleural ribs ; rachis strongly tapering backward ; pleurae non-tuberculate in large holaspides. |