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Pleesus aptus

Protozoa - Nassellaria - Syringocapsidae

Discussion

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.

Taxonomy
Pleesus aptus was named by Yeh (1987). Its type specimen is NMNS (000129) and is a 3D body fossil. Its type locality is Suplee-Izee area, OR-600A, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.

Synonymy list
YearName and author
1987Pleesus aptus Yeh p. 82 figs. Pl. 10, figs. 9, 18, 23; Pl. 23, fig. 7

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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
speciesaptus

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.

†Pleesus aptus Yeh 1987
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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 (15 total)


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