Turborotalia possagnoensis Tourmarkine & Bolli 1970 (TaxonConcept

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Species Turborotalia possagnoensis Tourmarkine & Bolli 1970

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION. Type of wall: Weakly cancellate in earlier chambers, becoming smootheer with cylindrical pustules in later chambers; tendency to defoliate. Test morphology: Trochospiral, compressed with 3 (rarely 3 1/2) chambers in the final whorl; chambers intlated, strongly radially compressed and appressed, increasing moderately rapidly in size; dorsal sutures straight or slightly curved, depressed; aperture a broad, low arch in intra-extraumbilical position, sometimes with a thin imperforate lip; umbilicus generally narrow; ventral sutures slightly curved, depressed; strong tendency for dextral coiling. Size: Holotype length 0.38 mm, breadth 0.31mm.

Discussion / Comments:

Pearson et al. (2006):
DISTINGUISHING FEATURES.- Turborotalia possagnoensis is distinguished from T. frontosa by the flatter filial chamber, which gives the test a quadrangular shape, by the more finely perforate wall texture and by generally having three chambers in the final whorl. It is distinguished from T. pomeroli by its more angular periphery, having fewer chambers in the final whorl and smaller size. DISCUSSION.- This species was originally described as an evolutionary intermediate between T. frontosa (which has been regarded by some as a subbotinid) and the undisputed turborotaliid species, T pomeroli. In our experience the morphospecies is quite rare in open ocean settings, although common in specimens from the Possagno area, where unfortunately the material is poorly preserved. We have, however, found well-preserved and closely comparable populations in wells from the Adriatic Sea. We regard possagnoensis as a relatively short-lived offshoot from T. frontosa, rather than an evolutionary intermediate to pomeroli as suggested by Toumarkine and Bolli (1970). PHYLOGENETIC RELATIONSHIPS.- Evolved from Turborotalia frontosa, according to Toumarkine and Bolli (1970). STRATIGRAPHIC RANGE.- Middle Eocene, middle Zone E9 to upper Zone Ell (Toumarkine and Bolli, 1970). GEOGRAPHIC DISTRIBUTION.- Cosmopolitan; possibly most common in northern mid-latitudes. STABLE ISOTOPE PALEOBIOL0GY.- Poore and Matthews (1984) recorded this species as having relatively negative oxygen isotope ratios indicating a shallow water habitat. On the other hand, Pearson and others (2001) recorded a deep, thermocline signal.

Systematics:

1
Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Turborotalia
          Species Turborotalia possagnoensis

35
  Ordo Foraminiferida
   Superfamilia Globigerinaceae
    Familia Hedbergellidae
     Genus Turborotalia
      Species Turborotalia possagnoensis

Synonym list:

Pearson et al. (2006):

p 1953 Globigerina frontosa Subbotina. - Subbotina : p.84 pl. 12; fig. 5a-c (paratype) (not holotype); [upper Eocene, Foraminiferal Layer, Green Series, Acarinina Zone (upper part), Kuban River; N. Caucasus]; [Not Subbotina, 1953]

1970 Globorotalia cerroazulensis possagnoensis Toumarkine & Bolli. - Toumarkine & Bolli : p.139 pl. 1; fig. 4 [middle Eocene, Possagno area, northern Italy]

1975 Globorotalia cerroazulensis possagnoensis Toumarkine & Bolli. - Toumarkine : p.744 pl. 2; fig. 2, 3 [middle Eocene Globorotalia lehneri Zone, DSDP Sete 305, northwest Pacific Ocean]

1985 Turborotalia cerroazulensis possagnoensis Toumarkine & Bolli. - Toumarkine & Luterbacher : p.137 fig. 34.10-15 (reillustration from the literature)

non 1988 Turborotalia possagnoensis Tourmarkine & Bolli. - Poore & Bybell : p.21 pl. 2; fig. 4-7 [middle Eocene Core ACGS#4, New Jersey]; [= Turborotalia pomeroli]

1995 Turborotalia possagnoensis Tourmarkine & Bolli. - Poag & Commeau : pl. 4; fig. 20-21 [Eocene, Salisbury Embayment, Virginia]

2006 Turborotalia possagnoensis Tourmarkine & Bolli. - Pearson et al. : p.451 pl. 15.7; fig. 1-9 (Pl. 15.7, Figs. 1-4: new SEMs of paratypes of Globorotalia cerroazulensis possagnoensis Toumarkine and Bolli)

Was used in synonym list of:

Turborotalia pomeroli Toumarkine & Bolli 1970

Stratigraphy - absolute ages:

FAD: 46 ± 0 [Ma], Berggren et al. (1995)

Specimen:

Museum d'Histoire Naturelle de Bale, Inventory number: C26569

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

Toumarkine,M. and Bolli,H.M. (1970):
Evolution de Globorotalia cerroazulensis (Cole) dans l'Eocene moyen et superieur de Possagno (Italie) . Revue de Micropaleontologie Vol. 13 p. 131-145

Toumarkine,M. (1975):
Middle and Late Eocene planktonic foraminifera from the northwestern Pacific, Leg 32 of the Deep Sea Drilling Project.
In: Initial Reports of the Deep Sea Drilling Project Vol. 32 Eds: Larson, R.L.Moberly, R. p. 735-751

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

Poore,R.Z. and Bybell,L.. (1988):
Eocene to Miocene biostratigraphy of New Jersey Core ACGS # 4: Implications for regional stratigraphy . U. S. Geological Survey Bulletin 1829 p. 1-22

Poag,C.W.. and Commeau,J.A.. (1995):
Paleocene to middle Miocene planktic foraminifera of the southwestern Salisbury Embayment, Virginia and Maryland: biostratigraphy, allostratigraphy, and sequence stratigraphy . Journal of Foraminiferal Research Vol. 25 p. 134-155

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

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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