Morozovella crater Hornibrook 1958 from: Pearson, P.N.Olsson, R.K.Hemleben, C.Huber, B.T.Berggren, W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513 . |
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Species Morozovella crater Hornibrook 1958 |
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Diagnosis / Definition: |
Pearson et al. (2006):
DESCRIPTION.
Type of wall: Muricate, nonspinose, normal
perforate.
Test morphology: Plano-convex test with lobulate
outline, ornamented with well developed mnuricocarina;
4 1/2-5 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.
Size: Maximum diameter of holotype: 0.53 mm
(Jenkins, 1971, p. 104). |
Discussion / Comments: |
Pearson et al. (2006):
DISTINGUISHING FEATURES.-
4 1/2 to 5 essentially
equidimensional chambers in last whorl, thickened
circumumbilical rim of elevated chamber shoulders,
strongly limbate sutures on spiral side.
DISCUSSION.-
In erecting the new species
Globorotalia crater Finlay (1939a) gave a brief description but no formal illustration(s). Thus, G. crater
was "nomen nudum". Specimens figured by Finlay
(1 939b, pl. 29: figs. 157, 162, 1 63) are from older strata
than the type level and are of a different species
(Homibrook, 1958). The first valid reference to M. crater
is by Hornibrook (1958, p. 33, pl. 1, figs. 3-5) in which
a holotype specimen is illustrated and a more thorough
description given. It would appear, then, that Homibrook
(1958) is to be credited with authorship of the species
crater rather than Finlay (1939 a, b; 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, 197 1) 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).
PHY LOGENETIC RELATIONSHIPS -
This form
evolved from M. lensiformis and evolved into M.
caucasica.
STRATIGRAPHIC RANGE.-
Zone E4 to Zone E9.
GEOGRAPHIC DISTRIBUTION.-
Widely distributed
in (sub)tropical areas of Atlantic, Mediterranean/
Tethyan, Pacific Oceans and austral regions.
STABLE ISOTOPE PALEOBIOLOGY.-
No data
available. |
Systematics: |
35 Ordo Foraminiferida
Superfamilia Globigerinaceae
Familia Truncorotaloididae
Genus Morozovella
Species Morozovella crater
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Synonym list: |
Pearson et al. (2006):
1939 Globorotalia crater Finlay. - Finlay : pl. 29; fig. 157, 162, 163 [upper Paleocene, mid-Waira, New Zealand]
1958 Globorotalia crater Finlay. - Hornibrook : p.33 pl. 1; fig. 3-5 [holotype
figured and redescribed from lower Eocene, sample F
5570, chalk marls below Amuri Strone, Hurunui River,
Heretaungan Stage, New Zealand]
1971 Globorotalia (Morozovella) crater Finlay. - Jenkins : p.103 pl. 8; fig. 192-194 (refigured holotype), 195-197 [lower Eocene, middle Waipara River section,
Mangaorapan Stage, New Zealand]
1979 Globorotalia (Morozovella) crater Finlay. - Blow : p.996 pl. 134, fig. 2-5, 9 and 10;
pl. 135, fig. 1,2;
pl. 224, fig. 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, fig. 2-4;
pl. 225, fig. 3-6;
pl. 164, fig. 3-5 [Zone P1O; Kane 9-C piston core, Endeavour Seamount, equatorial Atlantic Ocean];
pl. 226, fig. 5 [Zone P8b Hole 20C, South Atlantic Ocean]
1985 Globorotalia (Morozovella) gorrondatxensis Orue-Etxebarria. - Orue-Etxebarria : p.471 pl. 2; fig. 1-10 [lower middle Eocene
Truncorotaloides praetopilensis Zone, Getxo, westernmost
part of Gorrondatxe Reach to Azkorri Beach, Vizkaya
Province, Spain]
2004 Morozovella crater Finlay. - Pearson et al. : p.37 pl. 2; fig. 13, 14 [middle Eocene, Zone PI I, Tanzania
Drilling Project Site 2, Kilwa Masoko, Tanzania]
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Specimen: |
New Zealand Geological Survey Collection - Lower Hutt, New Zealand, Inventory number: TF 1077
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References: |
Finlay,H.J. (1939): New Zealand foraminifera; key species in stratigraphy, No. 3 . Transactions of the Royal Society of New Zealand Vol. 69 p. 309-29
Finlay,H.J. (1939): New Zealand foraminifera: key species in stratigraphy No. 2 . Trans. Proc. R. Soc. N.Z. Vol. 69 p. 89-128
Hornibrook,N.B. (1958): New Zealand foraminifera: key species in stratigraphy, no. 6 . N.Z.J. Geol. Geophys. Vol. 1
Mallory,V.S. (1959): Lower Tertiary Biostratigraphy of the California Coast Ranges. p. 146
Jenkins,D.G. (1971): New Zealand Cenozoic Planktonic Foraminifera . New Zealand Geological Survey Paleontological Bulletin Vol. 42
Blow,W.H. (1979): The Cainozoic Globigerinida. 3 Vols p. 1413 pp
Orue-Etxebarria,X.. (1985): Descripcion de dos neuvas species de foraminiferos planctonicos en el Eoceno costero de la Provincia de Bizkaia . Revista Espaiiola de Micropaleontologia Vol. 17 p. 467-477
Pearson,P.N.; Nicholas,C.J..; Singano,J.M..; Bown,P.R..; Coxali,H.K..; van Dongen,B.E..; Huber,B.T.; Karega,A..; Lees,J.A..; Misaky,E..; Pancost,R.D..; Pearson,M.. and Roberts,A.P.. (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 Vol. 39 p. 25-62
Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006): Atlas of Eocene Planktonic Foraminifera. p. 1-513
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