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Radiolaria - Nassellaria - Syringocapsidae


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).

Pleesus was named by Yeh (1987) [Sepkoski's age data: J Toar-l Sepkoski's reference number: 763]. It is not extant.

It was assigned to Syringocapsidae by Yeh (1987); and to Nassellaria by Sepkoski (2002).

Synonymy list
YearName and author
1987Pleesus Yeh
2002Pleesus Sepkoski, Jr.

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phylumRetariaCavalier-Smith 1999
classRadiolariaMüller 1858
superorderPolycystina(Ehrenberg 1867)
orderNassellariaEhrenberg 1875
superfamilyAmphipyndaceaRiedel 1967
familySyringocapsidaeForeman 1973

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.

No diagnoses are available