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Pseudoristola

Protozoa - Nassellaria - Parvicingulidae

Discussion

Original description: Test multicyrtid, conical to subconical, with two to six post-abdominal chambers. Cephalis conical to dome shaped without horn. Thorax and subsequent chambers trapezoidal in outline. Earlier chambers covered with layer of microgranular silica, remaining chambers consisting of single layer of regular to subregular pentagonal and hexagonal pore frames. Each post-abdominal chamber with two to three transverse rows of pore frames. Pore frames slightly variable in size, usually with largest pores along partitions. Test with or without poorly developed circumferential ridges. Final post-abdominal chamber closing and with latticed bulbous expansion.

Remarks Pseudoristola, n. gen., differs from Ristola Pessagno and Whalen (1982) by having a test with pore frames more irregular in shape, by lacking well developed circumferential ridges on post abdominal chambers, and by having its final post-abdominal chamber closing with a large latticed bulbous expansion rather than terminating in an open tubular extension.

Etymology: Pseudoristola pseudo(false) Ristola.

Taxonomy
Pseudoristola was named by Yeh (1987) [Sepkoski's age data: J Toar-l Sepkoski's reference number: 763].

It was assigned to Parvicingulidae by De Wever et al. (2001); and to Nassellaria by Sepkoski (2002).

Synonymy list
YearName and author
1987Pseudoristola Yeh p. 95
2001Pseudoristola De Wever et al. p. 271
2002Pseudoristola 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
familyParvicingulidaePessagno 1977
genusPseudoristola

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. †Pseudoristola Yeh 1987
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Pseudoristola horni O'Dogherty et al. 2006
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 Early/Lower Pliensbachian to the top of the Callovian or 192.90000 to 161.50000 Ma

Collections (40 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Pliensbachian192.9 - 184.2Canada (British Columbia) P. megaglobosa (119714 119716 119748 119765 119766 119767 119770 119773 119774 119775 119788 119789 119790 119792 119800 119808 119811)
Late/Upper Pliensbachian192.9 - 184.2Canada (British Columbia) P. megaglobosa (71080 71100 119776)
Pliensbachian192.9 - 184.2USA (California) P. sp. (87216)
Early/Lower Toarcian184.2 - 182.9USA (Oregon) P. faceta (124329 124330 124331 124335) P. faceta, P. megaglobosa (124328 124333 124334)
Early/Lower Toarcian184.2 - 182.9Japan P. sp., P. megaglobosa (124830)
Middle Toarcian182.9 - 180.4Japan P. sp. (76521)
Middle Bathonian168.2 - 165.3Switzerland P. horni, P. tsunoensis (66940) P. sp. 1, P. horni, P. tsunoensis, P. durisaeptum (66939)
Middle Bathonian - Early/Lower Callovian168.2 - 161.5Oman P. nova (125385)
Bathonian - Oxfordian168.2 - 154.8Spain Amphipyndax durisaeptum (131820)
Callovian165.3 - 161.5Italy Amphipyndax durisaeptum (47163 47164)
Callovian165.3 - 161.5USA (California) P. clava, P. nova (50738) P. clava, P. nova, P. sp. A (50737)
Late/Upper Callovian - Early/Lower Oxfordian165.3 - 154.8Germany (Bavaria) Amphipyndax tsunoensis (66985)
Late/Upper Callovian - Early/Lower Oxfordian165.3 - 154.8Philippines Amphipyndax tsunoensis (52070)