Morozovella lensiformis Subbotina 1953 (TaxonConcept

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Species Morozovella lensiformis Subbotina 1953

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION. Type of wall: Muricate, nonspinose, normal perforate. Test morphology: Test low trochospiral, subquadrate to subcircular, weakly lobulate, chambers moderately inflated on umbilical side; flat on spiral side except for initial chambers; surface densely covered by blundtruncated muricae giving the test a granular/sugary texture; 4-4 1/2 chambers visible in tight coil on umbilical side; primary aperture a low umbilical-extraumbilical slit extending to the periphery; sutures on umbilical side straight to slightly curved, slightly depressed; in spiral view 9-10 chambers in 2 1/2-3 whorls, early chambers/ whorls elevated giving biconvex appearance and often obscured by muricate growth; intercameral sutures moderately to strongly muricate and (re)curved yielding trapezoidal shaped chambers; weakly biconvex in edge view; peripheral muricocarina often obscured by fusion of muricae along margin. Size: Diameter: 0.40-0.55 mm; thickness: 0.25- 0.30 mm (Subbotina, 1953, p. 214).

Discussion / Comments:

Toumarkine & Luterbacher (1985):
The test is tightly coiled, with a narrow umbilicus and 4 to 5 chambers in the last whorl increasing rapidly in size. Sutures on spiral side are curved, depressed or flush. The development of the peripheral 'keel' is weak. Morozovella lensiformis differs from M. subbotinae by its more compact shape and tighter coiling.
Pearson et al. (2006):
DISTINGUISHING FEATURES.- This taxon is characterized by its subquadrate, involute, biconvex test with narrow umbilicus; test covered by moderately to densely distributed, blunt muricae obscuring, in some instances, the peripheral muricocarina; 4-4 1/2 chambers in last whorl. Later forms exhibit transitional features to plano-convex, multicameral M. aragonensis. DISCUSSION.- Subbotina (1953, p. 214) described this taxon from the lower part of the Zone of conical globorotaliids (to which it was said to be essentially restricted = Zone E4-5 of this paper). She recognized its descendant affinities with the Globorotalia marginodentata and G. crassata (=M. aequa-subbotinae group) and ancestral relationships with M. aragonensis, interpretations which have withstood the test of time, relatively unchanged. Shutskaya (1956) subsequently described the junior synonym Globorotalia nartanensis from essentially the same stratigraphic level and locality in the northern Caucasus and recognized its transitional features with aragonensis. Blow (1979, p. 981) treated M. dolabrata (Jenkins) as the ancestor of M. lensformis (Subbotina) (Blow, 1979, p. 1005). He distinguished the transition between the two on the following basis: an increase in tightness of coiling-mode and proportionate decrease in size of last chamber relative to earlier chambers and a relatively stronger recurvature of the spiral intercameral sutures and more tightly appressed chamber development in lensiformis. It is clear that Blow (1 979) viewed dolabrata as morphogenetically transitional from aequa S.S. to lenslformis. We view the two taxa as synonymous. Topotypes of dolabrata kindly sent to one of us (WAB) by D. Graham Jenkins exhibit a densely muricate test with 4- 4 1/2 chambers as in lensiformis. A ("buried") muricocarina rims the test. While Jenkins (1965) indicated that a peripheral keel was developed only on the last chamber, his own figures belie this fact (Jenkins, 1965, text-fig. 106), and Blow (1979, p. 401, 982) pointed out that the presence or visibility of a peripheral muricocarina is a function of the acuteness of the peripheral margins of the chambers. In broadly rounded margins the peripheral muricae are only partially fused and coalesced and do not yield the same "morphology" as that seen when the peripheral muricocarinae fuse into a single band along the margin of a test with an acutely angled periphery. A buried keel is characteristic of lensiformis as well and is dependent upon preservation as well as degree of acuteness of the peripheral margin. Distinction between these two morphotypes by Blow (1979) appear to be based on differences of degree rather than kind and we see little purpose in their separation. The upper stratigraphic limit of Zone P10 accorded by Blow (1979, p. 1005) to lenslformis remains enigmatic. We have not found morphotypes resembling lensformis at such stratigraphically high levels. PHYLOGENETIC RELATIONSHIPS.- This taxon (probably) evolved from M. subbotinae and is the ancestor of both M. crater in Zone E4 and M. aragonensis at the base of Zone E5. STRATIGRAPHIC RANGE.- Base of Zone E4 to Zone E6. GEOGRAPHIC DISTRIBUTION.- Relatively common in (sub)tropical areas; South Atlantic Ocean, Indo-Pacific, North Caucasus, among others. STABLE ISOTOPE PALEOBIOLOGY- Oxygen and carbon isotopes indicate a surface mixed layer habitat (Boersma and others, 1987).

Systematics:

1
Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Truncorotaloididae
         Genus Morozovella
          Species Morozovella lensiformis

15
  Classis Foraminifera
   Genus Morozovella
    Species Morozovella lensiformis

35
  Ordo Foraminiferida
   Superfamilia Globigerinaceae
    Familia Truncorotaloididae
     Genus Morozovella
      Species Morozovella lensiformis

Synonym list:

Toumarkine & Luterbacher (1985):

1953 Globorotalia lensiformis Subbotina. - Subbotina : p.214 pl 18 fgs 4-5 (type reference)

1985 Morozovella lensiformis Subbotina. - Toumarkine & Luterbacher : p.114 figs16.4-6

Pearson et al. (2006):

1953 Globorotalia lensiformis Subbotina. - Subbotina : p.214 pl. 18; fig. 4a-c (holotype) and 5a-c [lower Eocene Zone of conical globorotaliids, Foraminiferal Beds, Unit Fl, Nal'chik, Khieu River section, North Caucasus]

1956 Globorotalia nartanensis Shutskaya. - Shutskaya : p. 96-98 pl. 4; fig. 2a-c [G. subbotinae Zone, Cherkessk Horizon, Nal'chik, central northern Caucasus, former Soviet Union]

1957 Globorotalia californica Smith. - Smith : p.190 pl. 28; fig. 22a-23c [Vine Hill Sandstone, Selby, Contra Costa County, California]

1959 Globorotalia californica Smith. - Mallory : p.253 pl. 38; fig. 4a-c [lower Bulitian Stage, Lower Lodo Fm., Media Agua Creek, California]; [The name Globorotalia californica Smith 1957 is a junior homonym of Globorotalia calfornica Cushman and Todd 1948, which may be a praeglobotruncanid from California; see Ber

1962 Globorotalia (Truncorotalia) lensisformis Subbotina. - Hillebrandt : p.136 pl. 13; fig. 12a-13c [Zone G, Reichenhall-Salzburg Basin, Austria/Germany]

1964 Globorotalia lensiformis Subbotina. - Luterbacher : p.673 text-fig. 74a-c [topotype from Zone of conical globorotaliids, Khieu River section, northern Caucasus, determined by N.N. Subbotina, fide Luterbacher]

1965 Globorotalia dolabrata Jenkins. - Jenkins : p.1113 pl. 10; fig. 104-112 (holotype) [lower Eocene M. crater Zone, upper part of Waipawan Stage, Middle Waipara River section, North Island, New Zealand]

1971 Morozovella lensiformis Subbotina. - Berggren : pl. 5; fig. 18-20 [Zone P6b, DSDP Hole 20C, South Atlantic Ocean]

1971 Globorotalia (Morozovella) dolabrata Jenkins. - Jenkins : p.104 pl. 104; fig. 233-235 (holotype refigured), fig. 236-238, 239-241 (paratypes) [lower Eocene M. crater Zone, upper part of Waipawan Stage, Middle Waipara River section, North Island, New Zealand]

1972 Globorotalia lensiformis Subbotina. - Samuel : p. 192, 193 pl. 49, fig. 3-4c [middle Eocene, Borehole Sr- l, Bakony Mountains, Hungary]; pl. 5 1, fig. 6a-b, 7a-b [Borehole Ot-69, Bakony Mountains, Hungary]

1972 Globorotalia lensiformis carpatica Samuel. - Samuel : p. 127-128 pl. 36; fig. 1a-2c (holotype) [middle Eocene upper Turborotalia (Acarinina) crassata densa Zone, Myjava brick kiln, north east of Bratislava, Czechoslovakia]

1975 Globorotalia lensiformis Subbotina. - Stainforth et al. : p.200 text-fig. la-2c (reillustrated from Subbotina, 1953); text-fig. 3-7 [lower Eocene G. formosa formosa Zone, Lodo Fm., California]

1979 Globorotalia (Morozovella) lensisformis Subbotina. - Blow : p. 1003-1005 pl. 125, fig. 6-9; pl. 126, fig. 1-3; pl. 128, fig. 1-9; pl. 129, fig. 1-3 [Zone P8a, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 134, fig. 7; pl. 134, fig. 1 [Zone P8b, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 251, fig. 5 [lower Eocene, Region de Belu, France]

1979 Globorotalia (Morozovella) aequa dolabrata Jenkins. - Blow : p.981 pl. 125, fig. 3-5; pl. 127, fig. 8 [Zone P8a, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 133, fig. 1-6 [Zone PSb, DSDP Hole 47.2, Shatsky Rise, northwest Pacific Ocean]; pl. 137, fig. 2-9 [Zone P8b, DSDP Hole 20C, South Atlantic Ocean]; pl. 25 1, fig. 6 and 7 [Zone of conical globorotaliids, Novogeorgii Fm., Kuban River section, northern Caucasus]

1985 Morozovella lensiformis Subbotina. - Snyder & Waters : p.460 pl. 9; fig. 1, 3 [Zone P6b, DSDP Hole 548A, North east Atlantic Ocean]

2000 Morozovella lensiformis Subbotina. - Warraich et al. : p.293 fig. 17.7-9 [Zone P7, Dungan Fm., Rakhi Nala section, Sulaiman Range, Pakistan]

2001 Morozovella lensiformis Subbotina. - Warraich & Ogasawara : p.40 fig. 10.1-3 [Zone P7, Dungan Fm., Rakhi Nala section, Sulaiman Range, Pakistan]

2006 Morozovella lensiformis Subbotina. - Pearson et al. : p.363 pl. 11.9; fig. 1-16

Stratigraphy - absolute ages:

FAD: 54 ± 0 [Ma], Snyder & Waters (1985)
LAD: 52.7 ± 0 [Ma], Berggren et al. (1995) ODP Leg 80 Site 550

Specimen:

VNIGRI collections, St. Petersburg, Inventory number: 4111
VNIGRI collections, St. Petersburg, Inventory number: 4112

References:

Subbotina,N.N. (1953):
Iskopaemye foraminifery SSSR (Globigerinidy, Khantkenininidy i Globorotaliidy) . Trudy Vsesoyznogo Nauchno-Issledovatel'skogo Geologo-razvedochnogo Instituta (VNIGRI) Vol. 76 p. 296

Subbotina,N.N. (1953):
Fossil foraminifera of the USSR. Globigerinidae, Hantkeninidae and Globorotaliidae [in Russian] . Trudy Vsesoyuznogo Neftyanogo Nauchno-Isledovatelskogo Geologo-Razvedochnogo Instituta (VNIGRI), Novaya Seriya Vol. 76 p. 1-296

Shutskaya,E.K. (1956):
Stratigrafiya nizhnikh gorizontov paleogena Tsentral'nogo Predkavkaz'ya po foraminiferam . Trudy Instituta Geologii Nauk Akademiya SSSR Vol. 164(70) p. 3-114

Smith,B.Y. (1957):
Lower Tertiary Foraminifera from Contra Costa County California. , Publications of the Geological Society Vol. 32 p. 1-190

Mallory,V.S. (1959):
Lower Tertiary Biostratigraphy of the California Coast Ranges. p. 146

Hillebrandt,v.A.. (1962):
Das Paleozän und seine Foraminiferenfauna im Becken von Reichenhall und Salzburg . Bayerische Akademie Wissenschaft, Mathematischen-Naturwissenschaften Klasse Vol. 108 p. 188 p.

Luterbacher,H.P. (1964):
Studies in some Globorotalia from the Paleocene and Lower Eocene of the Central Apennines . Ecoglae geologicae Helvetiae Vol. 57 p. 631-730

Jenkins,D.G. (1965):
Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand . New Zealand Journal of Geology and Geophysics Vol. 8(6) p. 1088-1288

Berggren,W.A. (1971):
Paleogene Planktonic Foraminiferal Faunas on Legs I-IV (Atlantic Ocean), JOIDES Deep Sea Drilling Program- a Synthesis.
In: Proceedings of the II Planktonic Conference. Rome, Edizioni Tecnoscienza Vol. 1 Eds: Farinacci, A. p. 57-77

Jenkins,D.G. (1971):
New Zealand Cenozoic Planktonic Foraminifera . New Zealand Geological Survey Paleontological Bulletin Vol. 42

Samuel,O.. (1972):
New species of planktonic foraminifers from the Paleogene of the west Carpathian in Slovakia (Czechoslovakia) . Zbornik Geologick"ck Vied Západné Karpaty Vol. 17 p. 165-221

Stainforth,R.M.; Lamb,J.L.; Luterbacher,H.P.; Beard,J.H. and Jeffords,R.M. (1975):
Cenozoic planktonic foraminiferal zonation and characteristics of index forms . Paleontological ContributionsArticle 62 p. 425

Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp

Toumarkine,M. and Luterbacher,H.P. (1985):
Paleocene and Eocene Planktic Foraminifera.
In: Plankton Stratigraphy p. 87-154

Snyder,S.W. and Waters,V.J. (1985):
Cenozoic planktonic foraminiferal biostratigraphy of the Goban Spur region.
In: Deep Sea Drilling Project Vol. 80

Berggren,W.A.; Kent,D.V.; Swisher,C.C. and Aubry,M.P. (1995):
A revised Cenozoic Geochronology and Chronostratigraphy.
In: Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Special Publication Vol. 54

Warraich,M.Y..; Ogasawara,K.. and Nishi,H.. (2000):
Late Paleocene to early Eocene planktonic foraminiferal biostratigraphy of the Dungan Formation, Sulaiman Range, Central Pakistan . Paleontological Research Vol. 4 p. 275-301

Warraich,M.Y.. and Ogasawara,K.. (2001):
Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan . Science Reports of the Institute of Geoscience University of Tsukuba, section B Vol. 22 p. 1-59

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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