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Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pseudoristola
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.
It was assigned to Parvicingulidae by De Wever et al. (2001); and to Nassellaria by Sepkoski (2002).
Year | Name and author |
---|---|
1987 | Pseudoristola Yeh p. 95 |
2001 | Pseudoristola De Wever et al. p. 271 |
2002 | Pseudoristola Sepkoski |
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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.
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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 Pliensbachian | Canada (British Columbia) | P. megaglobosa (119714 119716 119748 119765 119766 119767 119770 119773 119774 119775 119788 119789 119790 119792 119800 119808 119811) | |
Late/Upper Pliensbachian | Canada (British Columbia) | P. megaglobosa (71080 71100 119776) | |
Pliensbachian | USA (California) | P. sp. (87216) | |
Early/Lower Toarcian | USA (Oregon) | P. faceta (124329 124330 124331 124335) P. faceta, P. megaglobosa (124328 124333 124334) | |
Early/Lower Toarcian | Japan | P. sp., P. megaglobosa (124830) | |
Middle Toarcian | Japan | P. sp. (76521) | |
Middle Bathonian | Switzerland | P. horni, P. tsunoensis (66940) P. sp. 1, P. horni, P. tsunoensis, P. durisaeptum (66939) | |
Middle Bathonian - Early/Lower Callovian | Oman | P. nova (125385) | |
Bathonian - Oxfordian | Spain | Amphipyndax durisaeptum (131820) | |
Callovian | Italy | Amphipyndax durisaeptum (47163 47164) | |
Callovian | USA (California) | P. clava, P. nova (50738) P. clava, P. nova, P. sp. A (50737) | |
Late/Upper Callovian - Early/Lower Oxfordian | Germany (Bavaria) | Amphipyndax tsunoensis (66985) | |
Late/Upper Callovian - Early/Lower Oxfordian | Philippines | Amphipyndax tsunoensis (52070) |