Daughter taxa (time control age-window is: 0-800Ma)
Syracosphaera aurisinae HOL 4 transvere pores in distal surface, tube openings large, quadrate. Usually 2 concentric rings of crystallites around margin
Syracosphaera gaarderae HOL 2 irregular pores in distal surface. 1 concentric ring of crystallites around margin
Syracosphaera isselii HOL 4-7 irregular pores in distal surface, tube openings irregular, well separated. 1 concentric ring of crystallites around margin
Syracosphaera magnaghii HOL Distal surface has hexagonal mesh fabric, but no large openings. 3 concentric rings of crystallites around margin
Citation: S. aurisinae HOL type Kleijne, 1991Taxonomic rank: genusType species: Poricalyptra aurisinae (Kamptner 1941) Kleijne, 1991Synonyms:
Poricalyptra Kleijne, 1991
Taxonomic discussion: The four species are separated by the patterns of pores in the body coccoliths, but the separation is consistent - coccospheres bearing more than one type have not been reported, nor do intermediate morphotypes seem to occur. The number of rings of crystallites seems to vary between species. The central ridge is similar in all four species, it is formed of a single row of crystallites, usually does not reach the edges of the coccolith and is often oblique [my observations - JRY 2018].
Two of these species, including the type species of the former genus Poricalyptra have now been definitively shown to be holococcolith stages of Syracosphaera species of the lamina/tumularis group. So the entire group ha now been recombined into Syracosphaera
Distinguishing features: Parent taxon (flat-topped): Holococcoliths with tube, covered distally by a flat cover This taxon: 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.
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range: Last occurrence (top): Extant. Data source: Total of ranges of the species in this database First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: flat-topped
References:
Kleijne, A. (1991). Holococcolithophorids from the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic Ocean. Marine Micropaleontology. 17: 1-76. gs
S. aurisinae HOL type compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-3-2025
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