Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | ![]() | Morozovelloides lehneri Test biconvex, very thin; chambers elongate, wedge-shaped; surface smooth except for blade-like to fimbriate peripheral muricocarina. Grades into M. coronatus in the lower part of its range, but has more elongate and more numerous chambers | ||
![]() | ![]() | ![]() | Morozovelloides coronatus Like M. crassatus but muricae clustered on the circumumbilical tips of the chambers forming a ‘coronet’ - like ornament; umbilicus open. | |
![]() | ![]() | Morozovelloides crassatus Test asymmetrically low-biconvex, sometimes nearly planoconvex; umbilicus closed to narrow | ||
![]() | ![]() | ![]() | Morozovelloides bandyi Distinguished from all other species of Morozovelloides by the strongly disjunct long axes of the chambers, as seen in spiral view. | |
Morozovelloides sp. Specimens which cannot be assigned to established species |
[Pearson & Berggren 2006]
Catalog entries: Morozovelloides
Distinguishing features: Like Morozovella, but derived from Acarinina.
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.
Wall type: Muricate, with a tendency for concentration of the muricae around the periphery and umbilical region and possessing smooth areas on the spiral side. Test morphology: Low trochospiral, generally lobulate or petaloid in outline, with concentration of bladed muricae around the periphery forming a discontinuous muricocarina. Four to eight chambers in the final whorl; aperture umbilical-extraumbilical or wholly extraumbilical. ETYMOLOGY.— Similar to Morozovella. [Pearson & Berggren 2006]
Morphology: Planispiral, biumbilicate or showing a subtly raised spiral side and very shallow umbilicus; 4-7 chambers in the final whorl; chambers rounded in the early stages, adult chambers radially elongated, triangular, polygonal or spherical, laterally compressed or highly inflated; some or all of the adult chambers extend into hollow non-porous tubulospines, of variable length, shape and orientation, or, in the case of H. singanoae n. sp., the chambers possess a distinct terminal nub or porous “proto-tubulospine”; peripheral outline (excluding tubulospines) varies from stellate, with deep incisions between chambers, to angular, smooth-continuous or gently lobed; the aperture is a single equatorial arch bordered by a distinctive lip of variable width, symmetrical or slightly asymmetrical.
[Pearson & Berggren 2006]
Most likely ancestor: Acarinina - at confidence level 0 (out of 5). Data source: Olsson et al. 1999.
Geological Range:
Notes: Restricted to the middle Eocene, Zones E7-E13. [Pearson & Berggren 2006]
Last occurrence (top): near top of Bartonian Stage (93% up, 38Ma, in Bartonian stage). Data source: Total of range of species in this database
First occurrence (base): near top of Ypresian Stage (94% up, 48.3Ma, in Ypresian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Primary source for this page: Pearson & Berggren 2006 - Eocene Atlas, chap. 10, p. 329
Cushman, J. A. & Jarvis, P. W. (1929). New foraminifera from Trinidad. Contributions from the Cushman Laboratory for Foraminiferal Research. 5: 6-17. gs V O Pearson, P. N. & Berggren, W. A. (2006). Taxonomy, biostratigraphy, and phylogeny of Morozovelloides n. gen. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 10): 327-342. gs V OReferences:
![]() |
Morozovelloides compiled by the pforams@mikrotax project team viewed: 26-2-2021
Short stable page link: https://mikrotax.org/pforams/index.php?id=100207 Go to Archive.is to create a permanent copy of this page - citation notes |