arrayname: original
Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
caucasica-aragonensis group (Eocene with muricocarina) | ||||
![]() | ![]() | ![]() | Morozovella caucasica Like M. crater but more strongly planoconical test with more chambers (usually 6-8) in the final whorl; umbilicus wider, and circumumbilical chamber margins strongly ornamented by fused muricae. It is strongly homeomorphic with M. velascoensis from the late Paleocene-early Eocene (Zone P3b-E2). | |
![]() | ![]() | ![]() | Morozovella crater Intermediate between M. lensiformis and M. caucasica - 4½ to 5 essentially equidimensional chambers in last whorl, thickened circumumbilical rim of elevated chamber shoulders, strongly limbate sutures on spiral side. | |
![]() | Morozovella aragonensis Like M. lensiformis but test planoconvex and with more chambers in final whorl (5-7) and nearly circular; terminal chamber generally smooth. | |||
![]() | ![]() | ![]() | Morozovella lensiformis Test subquadrate, involute, biconvex, with narrow umbilicus; covered by blunt muricae, often obscuring the peripheral muricocarina; 4-4½ chambers in last whorl. | |
apanthesma-subbotinae group(weak keel) | ||||
![]() | ![]() | ![]() | Morozovella marginodentata Morphotype, with pronounced peripheral compression of the chambers on the umbilical side and a thick muricocarina formed form long muricae. | |
![]() | ![]() | Morozovella formosa Like M. gracilis but test larger and more robust; more chambers in final whorl (6-7, rarely 8) and wider umbilicus. | ||
![]() | ![]() | Morozovella gracilis Like M. subbotinae but with lower spire and more chambers (5-6). | ||
![]() | ![]() | Morozovella subbotinae Like M. aequa but larger, with sronger muricocarina and more pronounced angulo-conical test; 4-4½ chambers in final whorl. | ||
![]() | ![]() | Morozovella aequa Like M. apanthesma but with less chambers (usually 4), more involute coiling (and so a more closed umbilicus) and a peripheral muricocarina. | ||
![]() | ![]() | ![]() | Morozovella apanthesma Planoconvex, umbilicoconvex, test with lobulate, weakly muricocarinate periphery; 4-5 chambers in last whorl, inflated to subangular on umbilical side, moderately convex, triangular (lunate) in edge view; intercameral sutures on umbilical side depressed, radially curved and slightly depressed on spiral side; umbilical side distinctly muricate, coarsely perforate on spiral side; umbilicus relatively narrow, deep; aperture an interiomarginal, umbilical-extraumbilical arch with narrow, continuous intraperiumbilical lip. | |
angluata-velascoensis group (heavy muricate keel) | ||||
![]() | ![]() | ![]() | Morozovella edgari Like M. velascoensis but smaller and with weaker muricocarina. Very similar to juveniles of M. velascoensis and may have evolved from it by paedomorphosis. | |
![]() | ![]() | ![]() | Morozovella allisonensis Like M. velascoensis but axially compressed and less ornate; biconvex to mildly planoconvex in edge view; umbilical tips of chambers are relatively rounded and unornamented. | |
![]() | ![]() | ![]() | Morozovella acuta Like M. velascoensis but wth smaller umbilicus, weaker ornament and fewer chambers in final whorl (usually 5). | |
![]() | ![]() | ![]() | Morozovella occlusa Like M. acutispira but without raised early part of test. | |
![]() | ![]() | Morozovella acutispira Like M. pasionensis but with development of a biconvex test; fewer chambers in the final whorl (4-6); and smaller umbilicus. Early part of test raised on spiral side. | ||
![]() | ![]() | ![]() | Morozovella pasionensis Like M. velascoensis but with reduced spire height, a decrease in the ornament around the umbilicus, and an increase in the number of chambers (usually 5-7, up to 10). | |
![]() | ![]() | Morozovella velascoensis Like M. conicotruncata but with coarsely muricate adumbilical ridges and muricocarina; and complete loss of muricae on the chamber surfaces. | ||
![]() | ![]() | Morozovella conicotruncata Like M. angulata (White) but test more planoconvex; umbilucs more open; and with a low rate of chamber enlargement, and so (5-7) equidimensional chambers in the final whorl. | ||
![]() | ![]() | Morozovella angulata Like M. praeangulata but with elaboration of the muricae, development of a peripheral muricocarina, and establishment of anguloconical chambers throughout the last whorl. | ||
![]() | ![]() | ![]() | Morozovella praeangulata Planoconvex, moderately lobulate test with 5-6 tangentially elongate chambers in last last whorl; umbilical sutures straight to weakly curved, incised; spiral intercameral sutures incised, weakly muricate, strongly recurved; peripheral margin strongly muricate but not muricocarinate; umbilicus narrow, deep; aperture an interiomarginal, umbilical-extraumbilical slit (with distinct lip in well preserved specimens). | |
Morozovella sp. Specimens which cannot be assigned to established species |
For discusion of correct citation of the name see the taxonomic catalog.
Catalog entries: Morozovella
Distinguishing features:
Parent taxon (Truncorotaloididae): Muricate
This taxon: Test typically plano-convex, chambers strongly anguloconical.
Wall strongly pustulose (muricate) on parts of spire and umbilicus. Most species with muricocarina.
Diagnostic characters:
Morphology:
[Eocene Atlas]
Wall type:
Similar species
[Eocene Atlas]
Most likely ancestor: Praemurica - at confidence level 0 (out of 5). Data source: Olsson et al. 1999.
Likely descendants: Acarinina; Planorotalites;
plot with descendants
Geological Range:
Last occurrence (top): at top of E9 zone (100% up, 43.2Ma, in Lutetian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within P2 zone (62.29-62.60Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Primary source for this page: Olsson et al. 1999 - Atlas of Paleocene Planktonic Foraminifera, p. 54
Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs Cushman, J. A. (1925e). Some new foraminifera from the Velasco shale of Mexico. Contributions from the Cushman Laboratory for Foraminiferal Research. 1(1): 18-23. gs Luterbacher, H. P. (1964). Studies in some Globorotalia from the Paleocene and Lower Eocene of the Central Apennines. Eclogae Geologicae Helvetiae. 57: 631-730. gs O Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gsReferences:
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Morozovella compiled by the pforams@mikrotax project team viewed: 20-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=100185 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
Hello,
Morozovella was first published as a subgenus of Truncorotaloides. Loeblich and Tappan (1987, p. 478) indicate that the publication of T.(Morozovella) in Luterbacher (1964) is not available because it was published as a synonym of Globorotalia (Opinion of Luterbacher, p. 645)[ICZN art. 11.6]. Therefore T. (Morozovella) was only made available in 1968: McGowran, B. (1968). Reclassification of Early Tertiary Globorotalia. Micropaleontology. 14(2): 179-198.
I hope it helps too,
François
Hi Francois
Thank you for that observation. The logic of Loeblich & Tappan seems completely correct to me and I will emend the entries accordingly.
all the best
Jeremy