pforams@mikrotax - Morozovella crater

pforams@mikrotax - Morozovella crater pforams@mikrotax - Morozovella crater

Morozovella crater

Classification: pf_cenozoic -> Truncorotaloididae -> Morozovella -> Morozovella crater
Sister taxa: M. caucasica, M. crater, M. aragonensis, M. lensiformis ⟩⟨ M. marginodentata, M. formosa, M. gracilis, M. subbotinae, M. aequa, M. apanthesma ⟩⟨ M. edgari, M. allisonensis, M. acuta, M. occlusa, M. acutispira, M. pasionensis, M. velascoensis, M. conicotruncata, M. angulata, M. praeangulata, M. sp.

Eocene_Atlas_pl11-5_fig9-11.jpg
Eocene_Atlas_pl11-5_fig1-2-13.jpg
Eocene_Atlas_pl11-5_fig3-4-6-8.jpg
Eocene_Atlas_pl11-5_fig5-7-12.jpg
Eocene_Atlas_pl11-5_fig14.jpg
Eocene_Atlas_pl11-5_fig15-16.jpg

Taxonomy

Citation: Morozovella crater (Finlay 1939)

taxonomic rank: Species

Basionym: Globorotalia crater Finlay 1939

Synonyms:

Globorotalia crater Finlay, 1939a:125, (no figures).—Hornibrook, 1958:33, pl. 1: figs. 3-5 [holotype of Finlay figured and redescribed from lower Eocene, sample F 5570, chalk marls below Amuri Strone, Hurunui River, Heretaungan Stage, New Zealand].
Globorotalia (Morozovella) crater Finlay.—Jenkins, 1971:103, pl. 8: figs. 192-194 (refigured holotype), figs. 195-197 [lower Eocene, middle Waipara River section, Mangaorapan Stage, New Zealand].—Blow, 1979:996. pl. 134: figs. 2-5, 9 and 10; pl: 135, figs. 1,2; pl: 224, figs. 5,6 [detail of pl. 135: fig. 2] [Zone P8b, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 138: figs. 4-8; pl. 225: fig. 1 [ Zone P 8b, DSDP Hole 20C, South Atlantic Ocean]; pl. 141: fig. 3; pl. 146: fig. 5 [Zone P9, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 154: figs. 2-4; pl. 225: figs. 3-6; pl. 164: figs. 3-5 [Zone P10; Kane 9-C piston core, Endeavour Seamount, equatorial Atlantic Ocean]; pl. 226: fig. 5 [Zone P8b Hole 20C, South Atlantic Ocean].
Morozovella crater (Finlay)._ Pearson and others, 2004:37, pl. 2, figs. 13, 14 [middle Eocene, Zone P11, Tanzania Drilling Project Site 2, Kilwa Masoko, Tanzania].
Globorotalia aragonensis Nuttall var. twisselmanni.— Mallory, 1959:252, pl. 23: figs. 1a-c [lower Eocene, Penutian Stage, lower Lodo Fm., Media Agua Creek, California].
Globorotalia (Morozovella) gorrondatxensis Orue -Etxebarria, 1985:471, pl. 2: figs. 1-10 [lower middle Eocene Truncorotaloides praetopilensis Zone, Getxo, westernmost part of Gorrondatxe Beach to Azkorri Beach, Vizkaya Province, Spain].
Not Globorotalia crater Finlay, 1939b: pl. 29: figs. 157, 162, 163 [upper Paleocene, mid-Waira, New Zealand].
Morozovella crater (Hornibrook 1958) — Berggren & Pearson 2006:358, pl. 11.5: figs 1-16.

Taxonomic discussion: NB. The discussion below has been corrected from that given in Berggren & Pearson (2006) since they incorrectly stated that G. crater was nomen nudum until Hornibrook (1958) illustrate the holotype. In fact illustration of a holotype is only mandatory under the ICZN for taxa described after 1999 and Finlay's original description was valid. [editor's comment, JR Young 2017]

Orue-Etxebarria et al. (2014) argue for separation of M. gorrondatxensis as separate species from M. crater.

In erecting the new species Globorotalia crater Finlay (1939a) gave a brief description but no formal illustration(s). Specimens figured by Finlay (1939b, pl. 29: figs. 157, 162, 163) are from older strata than the type level and are of a different species (Hornibrook, 1958). The first proper clarification of M. crater is by Hornibrook (1958, p. 33, pl. 1, figs. 3-5) in which the holotype specimen is illustrated and a more thorough description given; see also Berggren, 1977, (p. 245, 246). Jenkins (1971, p. 103) and Blow (1979, p. 996) have presented extensive discussion of this taxon and suggested that it is either a junior synonym (Jenkins, 1971) or a pene-contemporaneous homeomorph (Blow, 1979) of M. formosa. We have found in the course of our work that crater exhibits a general test shape closer to that of aragonensis (subcircular, weakly lobulate periphery) than formosa (moderately to strongly lobulate periphery and early vorticiform spiral intercameral sutures). [Berggren & Pearson 2006]

Catalog entries: Globorotalia crater, Globorotalia aragonensis twisselmanni, Globorotalia (Morozovella) gorrondatxensis

Type images:

holotype: G. crater

Distinguishing features:
Parent taxon (Morozovella): Test typically plano-convex, chambers strongly anguloconical.
Wall strongly pustulose (muricate) on parts of spire and umbilicus. Most species with muricocarina.
This taxon: 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.

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.
They are being edited as the site is developed and comments on them are especially welcome.

Description

Morphology:

Plano-convex test with lobulate outline, ornamented with well developed muricocarina; 4½ to 5 essentially equidimensional chambers in last whorl; umbilical intercameral sutures weakly curved to radial; sutures on spiral side curved, limbate, heavily ornamented (beaded); umbilicus deep and relatively wide, rimmed by everted, thickened circumumbilical rim of elevated chamber shoulders (tips); in edge view distinctly plano-convex.; aperture a low, interiomarginal, umbilical-extraumbilical slit with thin lip. [Berggren & Pearson 2006]

Wall type:

Muricate, nonspinose, normal perforate. [Berggren & Pearson 2006]

Size:

Maximum diameter of holotype: 0.53 mm (Jenkins, 1971, p. 104). [Berggren & Pearson 2006]

Character matrix
test outline: Lobate chamber arrangement: Trochospiral edge view: Planoconvex aperture: Umbilical-extraumbilical
sp chamber shape: Crescentic coiling axis: High periphery: Muricocarinate aperture border: Thin lip
umb chbr shape: Subtriangular umbilicus: Wide periph margin shape: Subangular accessory apertures: None
spiral sutures: Raised muricate umb depth: Deep wall texture: Moderately muricate shell porosity: Finely Perforate: 1-2.5µm
umbilical or test sutures: Raised muricate final-whorl chambers: 4.5-5 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Widely distributed in (sub)tropical areas of Atlantic, Mediterranean/ Tethyan, Pacific Oceans and austral regions. [Berggren & Pearson 2006]
Aze et al. 2011 summary: Low latitudes; based on Berggren & Pearson (2006)

Isotope paleobiology

No data available. [Berggren & Pearson 2006]
Aze et al. 2011 ecogroup 1 - Open ocean mixed-layer tropical/subtropical, with symbionts; based on comparison with other species of the genus.

Phylogenetic relations

This form evolved from M. lensiformis and evolved into M. caucasica. [Berggren & Pearson 2006]

Most likely ancestor: Morozovella lensiformis - at confidence level 4 (out of 5). Data source: Berggren & Pearson (2006) f11.1.
Likely descendants: Morozovella caucasica; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Zone E4 to Zone E9. [Berggren & Pearson 2006]
Last occurrence (top): in upper part of E9 zone (70% up, 43.4Ma, in Lutetian stage). Data source: Berggren & Pearson (2006) f11.1
First occurrence (base): in lower part of E4 zone (40% up, 53.8Ma, in Ypresian stage). Data source: Berggren & Pearson (2006) f11.1

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
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Taxon plotted: Morozovella crater, synonyms included - Globorotalia crater; Globorotalia crater crater; Morozovella crater;
See also space-time plot :: Samples map :: Parent: Morozovella

Primary source for this page: Berggren & Pearson 2006 - Eocene Atlas, chap. 11, p. 358

References:

Berggren, W. A. & Pearson, P. N. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Morozovella. 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 11): 343-376. gs O

Berggren, W. A. (1977a). Atlas of Palaeogene Planktonic Foraminifera: some Species of the Genera Subbotina, Planorotalites, Morozovella, Acarinina and Truncorotaloides. In, Ramsay, A. T. S. (ed.) Oceanic Micropaleontology. Academic Press, London 205-300. gs

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

Finlay, H. J. (1939b). New Zealand foraminifera: Key species in stratigraphy - no. 2. Transactions of the Royal Society of New Zealand. 69(1): 89-128. gs

Hornibrook, N. d. B. (1958). New Zealand Upper Cretaceous and Tertiary foraminiferal zones and some overseas correlations. Micropaleontology. 4: 25-38. gs

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs

Mallory, V. S. (1959). Lower Tertiary biostratigraphy of the California Coast Ranges. American Association of Petroleum Geologists, Tulsa, Oklahoma. 1-416. gs

Orue-Etxebarria, X. (1985a). Descripcion de dos nuevas especies de foraminiferos planctonicos en el Eoceno costero de la Provincia de Bizkaia. Revista Española de Micropaleontología. 17(3): 467-477. gs

Orue-Etxebarria, X., Payros, A., Caballero, F., Apellaniz, E., Pujalte, V. & Ortiz, S. (2014). Morozovella gorrondatxensis (Orue-Etxebarria 1985) vs M. crater (Hornibrook 1958): taxonomy and significance for Early/Middle Eocene boundary biostratigraphy. Stratigraphy. 11(2): 173-183. gs

Pearson, P. N. et al. (2004). Paleogene and Cretaceous sediment cores from the Kilwa and Lindi areas of coastal Tanzania: Tanzania Drilling Project Sites 1–5. Journal of African Earth Sciences. 39: 25-62. gs

Morozovella crater compiled by the pforams@mikrotax project team viewed: 11-12-2023

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Short stable page link: https://mikrotax.org/pforams/index.php?id=100195 Go to Archive.is to create a permanent copy of this page - citation notes

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test outline:	Lobate	chamber arrangement:	Trochospiral	edge view:	Planoconvex	aperture:	Umbilical-extraumbilical
sp chamber shape:	Crescentic	coiling axis:	High	periphery:	Muricocarinate	aperture border:	Thin lip
umb chbr shape:	Subtriangular	umbilicus:	Wide	periph margin shape:	Subangular	accessory apertures:	None
spiral sutures:	Raised muricate	umb depth:	Deep	wall texture:	Moderately muricate	shell porosity:	Finely Perforate: 1-2.5µm
umbilical or test sutures:	Raised muricate	final-whorl chambers:	4.5-5	N.B. These characters are used for advanced search. N/A - not applicable