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Pleesus

Protozoa - Nassellaria - Syringocapsidae

Discussion

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).

Taxonomy
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).

Species
P. aptus

Synonymy list
YearName and author
1987Pleesus Yeh
2002Pleesus Sepkoski

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RankNameAuthor
—Life
—Eukaryota()
classProtozoaGoldfuss 1820
subphylumSarcodinaSchmarda 1871
classReticulareaLankester 1885
subclassRadiolaria(Müller 1858)
RankNameAuthor
superorderPolycystina(Ehrenberg 1838)
orderNassellariaEhrenberg 1875
superfamilyAmphipyndaceaRiedel 1967
familySyringocapsidaeForeman 1973
genusPleesus

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.

G. †Pleesus Yeh 1987
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†Pleesus aptus Yeh 1987
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: silicap
Environment: marinep
Locomotion: passively mobilep
Life habit: planktonicp
Diet: omnivorep
Created: 2005-01-28 01:13:47
Modified: 2005-01-28 03:13:47
Source: p = phylum
Reference: Kiessling 1999

Age range: base of the Sinemurian to the top of the Early/Lower Toarcian or 199.50000 to 182.90000 Ma

Collections (16 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Sinemurian199.5 - 192.9Philippines P. aptus (51813 51815 51816)
Sinemurian - Pliensbachian199.5 - 184.2Japan P. aptus (120003)
Early/Lower Pliensbachian192.9 - 184.2Canada (British Columbia) P. aptus (119714 119775)
Late/Upper Pliensbachian192.9 - 184.2Canada (British Columbia) P. aptus (119711)
Late/Upper Pliensbachian192.9 - 184.2USA (Oregon) P. aptus (124327)
Pliensbachian192.9 - 184.2Mexico (Baja California Sur) P. sp. A (33558)
Late/Upper Pliensbachian - Early/Lower Toarcian192.9 - 182.9Oman P. aptus (125296)
Early/Lower Toarcian184.2 - 182.9Japan P. spp., P. sp., P. aptus (124830)
Early/Lower Toarcian184.2 - 182.9Oman P. aptus (125205)
Early/Lower Toarcian184.2 - 182.9USA (Oregon) P. aptus (124328 124331 124333 124334)