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Species Morozovella crater Hornibrook 1958


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
Synonym list:
Pearson et al. (2006):
1939 Globorotalia crater Finlay. - Finlay : p.125 (no figures; nomen nudum)
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]
1959 Globorotalia aragonensis var. twisselmanni Mallory. - Mallory : p.252 pl. 23; fig. 1a-c [lower Eocene, Penutian Stage, lower Lodo Fm., Media Agua Creek, Califonlia]
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]
2006 Morozovella crater Hornibrook. - Pearson et al. : p.355 pl. 11.5; fig. 1-16
Specimen:
New Zealand Geological Survey Collection - Lower Hutt, New Zealand, Inventory number: TF 1077
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
Anonymous: Unedited TaxonConcept data
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