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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Hsuum gratum
Original description: Test wide, subconical to subcylindrical in shape, with well-developed horn. Cephalis and thorax sparsely perforated with short ridges, covering with layer of microgranular silica. All but final post-abdominal chamber gradually increasing in width and length as added. Final post-abdominal chamber decreasing in width. Abdomen and post-abdominal chambers consisting of square to rectangualr pore frames with long costae superimposed between everyone or two rows of pore frames. Costae with short, transverse elements.
Original remarks: Hsuum gratum n. sp. differs from H. acutum n. sp. by having a wider subconical test, and by having thinner, more regular costae on the earlier chambers.
Etymology: Gratus-a-um (Latin, adj.) pleasing.
| Year | Name and author |
|---|---|
| 1987 | Hsuum gratum Yeh p. 65 figs. Pl. 16, figs. 7, 13, 18, 21 |
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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.