| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pleesus aptus
Original description: Test as with genus, elongate spindle-shaped, with slight constrictions between joints, with as many as nine post-abdominal chambers. Cephalis dome-shaped, medium in size, without horn. Thorax and subsequent chambers trapezoidal in outline, gradually increasing in width as added, with final post-abdominal chamber slightly inflated and terminating in narrow, latticed, tubular extension. Cephalis imperforate, thorax and abdomen sparsely perforate, covered by layer of microgranular silica. Post-abdominal chambers consisting of single layer of subregular tetragonal, pentagonal, and hexagonal pore frames. Pore frames gradually increasing in size distally.
Etymology: Aptus-a-um (Latin, adj.) useful.
| Year | Name and author |
|---|---|
| 1987 | Pleesus aptus Yeh p. 82 figs. Pl. 10, figs. 9, 18, 23; Pl. 23, fig. 7 |
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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.