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Pleesus
Original description: Test multicyrtid, spindle-shaped (conical when broken), with or without constrictions between joints. Cephalis dome-shaped with horn. Earlier chambers covered with layer of microgranular silica, remaining chambers consisting of single layer of regular to subregular polygonal pore frames. Final post-abdominal chambers slightly inflated and terminating in open, narrow, elongate, tubular extension.
Original remarks: Pleesus, n. gen., differs from Katroma Pessagno and Poisson (1981) by lacking a horn on cephalis, and by having a less inflated final post-abdominal chamber.
Etymology: Pleesus is a name formed by and arbitrary combination of letters (ICZN, 1985, Appendix D, pt. VI, Recommndation 41, p. 201).
It was assigned to Syringocapsidae by Yeh (1987); and to Nassellaria by Sepkoski (2002).
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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.