Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
Poricalyptra aurisinae 4 transvere pores in distal surface, tube openings large, quadrate. Usually 2 concentric rings of crystallites around margin | ||||
Poricalyptra isselii 4-7 irregular pores in distal surface, tube openings irregular, well separated. 1 concentric ring of crystallites around margin | ||||
Poricalyptra magnaghii Distal surface has hexagonal mesh fabric, but no large openings. 3 concentric rings of crystallites around margin | ||||
Syracosphaera gaarderae HOL 2 irregular pores in distal surface. 1 concentric ring of crystallites around margin | ||||
Poricalyptra sp. Specimens which cannot be assigned to established species |
Taxonomy:
Distinguishing features: Dimorphic - liths cavate
BCs flat topped with large openings in tube and variable openings in distal surface; tiered wall fabric; low transverse ridge.
CFCs helladoliths - ridge of BCs is extended into prominent leaf, no openings in tube.
Farinacci & Howe catalog pages: Poricalyptra *
Size: Liths 2-2.5 µm long.
Tags | LITHS: holococcolith, elliptical, CSPH: elongated, CFC, CROSS-POLARS: V-prominent, R-prominent, |
Metrics | Lith size: 1.7->2.6µm; Coccosphere size: 7->12µm; |
Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at top of No known fossil record modern (100% up, 0Ma, in "Holocene" stage). Data source: Total of range of species in this database
Plot of occurrence data:
Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gsReferences:
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Poricalyptra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1106 Go to Archive.is to create a permanent copy of this page - citation notes |