K_S 1983 61-6.JPG
K_S 1983 61-2.JPG
K_S 1983 61-6.JPG
K_S 1983 61-2.JPG
Catalog entries: Hastigerinella riedeli
Type images:
holotype: H. riedeli
paratypes: H. riedeli
paratypes: H. riedeliDistinguishing features: monospecific
NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
Morphology: Test very small, low trochospiral to slightly streptospiral, equatorial periphery distinctly lobulate; axial periphery broadly rounded; chambers subglobular, 5 in the final whorl, increasing slowly in size as added, final chamber slightly bent over the umbilicus; suture distinct, nearly radial, depressed; surface smooth , delicate with very fine, widely spaced perforations and triradial spines , which are concentrated on the distal ends of chambers; aperture interiomarginal, umbilical, rather a low arch, bordered by a narrow but distinct lip. [Kennett & Srinivasan 1983]
Size: <150µm
Character matrix
| test outline: | Stellate | chamber arrangement: | Trochospiral | edge view: | Concavo-convex | aperture: | Umbilical |
| sp chamber shape: | Elongate | coiling axis: | Low | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Elongate | umbilicus: | Narrow | periph margin shape: | Moderately rounded | accessory apertures: | None |
| spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Microperforate: <1µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 5.0-5.0 | N.B. These characters are used for advanced search. N/A - not applicable | |||
In modern oceans a rare, cold water, species [SCOR WG138]
Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]
Phylogenetic relations: The ancestry of Hs. riedeli is uncertain (Text Fig. 26). The surface ultrastructure suggests that it most closely resembles Hastigerina pelagica. [Kennett & Srinivasan 1983]
Most likely ancestor: Hastigerina pelagica - at confidence level 1 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 26.
Geological Range:
Last occurrence (top): Extant Data source: present in the plankton (SCOR WG138)
First occurrence (base): within N22 zone (0.00-1.93Ma, base in Gelasian stage). Data source: Kennett & Srinivasan 1983 (as Hastigerinopsis reideli)
Plot of occurrence data:
Primary source for this page: Kennett & Srinivasan 1983, p.244
Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs Poore, R. Z. (1979). Oligocene through quarternary planktonic foraminiferal biostratigraphy of the North Atlantic: DSDP LEG 49. Initial Reports of the Deep Sea Drilling Project. 49: 447-517. gs Rögl, F. & Bolli, H. M. (1973). Holocene to Pleistocene planktonik foraminifera of LEG 15, site 147 (Cariaco Basin (Trench), Caribbean Sea) and their climatic interpretation. Initial Reports of the Deep Sea Drilling Project. 15: 553-579. gs V O Saito, T. (1976). Geologic significance of coiling direction in the planktonic foraminifera Pulleniatina. Geology. 4(5): 305-309. gs Saito, T., Thompson, P. R. & Breger, D. (1981). Systematic Index of Recent and Pleistocene Planktonic Foraminifera. University of Tokyo Press, Tokyo. 1-190. gsReferences:
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Orcadia riedeli compiled by the pforams@mikrotax project team viewed: 12-4-2021
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