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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Crubus firmus
Original description: Test elongate, conical, gradually tapering and pointed apically. Cephalis medium in size, conical to hemispherical, with small horn when well-preserved, imperforate, and covered with layer of microgranular silica. Thorax, abdomen, and first two post-abdominal chambers with outer layer of irregular polygonal pore frames. Remaining post-abdominal chambers with very thin costae between each row of pore frames.
Original remarks: Crubus firmus, n. sp., differs from C. chengi, n. sp , by having a more conical test with a less massive horn, and by having less massive irregular pore frames on the earlier chambers.
Etymology: Firmus-a-um (Latin, adj.) firm.
| Year | Name and author |
|---|---|
| 1987 | Crubus firmus Yeh p. 69 figs. Pl. 18, figs. 12, 18 |
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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.