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Species Hedbergella delrioensis Carsey 1926



Diagnosis / Definition:
Gasinski (1988):
Dimensions: D=0.20-0.60mm, t=O.lO-0.25 mm
Discussion / Comments:
Caron (1985):
The species with usually 5-6 globular chambers forming the last whorl shows little variability.
Gasinski (1988):
Remarks: H. infracretacea (Glaessner) has been previously (Gasinski, 1983) excluded from H. delrioensis because of its smaller size, lack of dominance of the last chamber, and less spinose test. More recently, and as noted by Masters (1977), Leckie (1984) and C aron (1985), it is now considered to be a synonym of H. delrioensis, although others (Carter & Hart, 1977; Price, 1977a, b; Pflaumann & Krasheninnikov, 1977; Sigal, 1979; McNulty, 1979, 1984) still separate H. infracretacea. These authors have attached the rank of species to individual ecophenotypes without adequate analysis of the intraspecific variation (cf. Gasinski, 1983). Local stratigraphic range: Hedbergella assemblage to R. reicheli-R. greenhornesis Zones.
Pflaumann & Krasheninnikov (1977):
trochospiral, last chamber protruding to the small umbilicus. In the Hauterivian and Barremian samples, we encountered specimens of similar shape, but without visible hispidity (Plate 1, Figure 8). Longoria (1974) recorded the species since the Leupoldina cabri Zone (upper Aptian) to Rotalipora evoluta Subzone (Cenomanian).
Systematics:

5
 Classis Foraminifera
  Familia Globotruncanidae
   Genus Hedbergella
    Species Hedbergella delrioensis

22
  Familia Globotruncanidae
   Subfamilia Hedbergellinae
    Genus Hedbergella
     Species Hedbergella delrioensis

52
  Familia Rotaliporidae
   Subfamilia Hedbergellinae
    Genus Hedbergella
     Species Hedbergella delrioensis
Synonym list:
Caron (1985):
1926 Globigerina cretacea var. delrioensis Carsey. - Carsey : p.43 (type figure not given)
1937 Globigerina infracretacea Glaessner. - Glaessner : p.28 text fig 1 (neotype)
1948 Globigerina portsdownensis Williams-Mitchell. - Williams-Mitchell : pl 8 figs 4a-c (neotype)
1974 Hedbergella delrioensis Carsey. - Longoria : 54-55 pl 10 figs 1-3 (neotype)
1985 Hedbergella delrioensis Carsey. - Caron : 58, 59 figs 25.6-7 (neotype)
Loeblich & Tappan (1961):
1926 Globigerina cretacea var. delrioensis Carsey. - Carsey : p.43
1940 Globigerina cretacea d'Orbigny. - Tappan : p.121 pl. 19; fig. 11
1952 Globigerina gautierensis Brönnimann. - Brönnimann : p.11 pl. 1, fig. 1-3; text-fig. 2
1954 Globigerina delrioensis Carsey. - Frizzell : p.127 pl. 20; fig. 1
1959 Praeglobotruncana gautierensis Brönnimann. - Bolli : p.265 pl. 21; fig. 3-6
1959 Praeglobotruncana (Hedbergella) delrioensis Carsey. - Banner & Blow : p.8
1961 Hedbergella delrioensis Carsey. - Loeblich & Tappan : p.283 pl. 2; fig. 11-13
Gasinski (1988):
1926 Globigerina cretacea var. delrioensis Carsey. - Carsey : p.43 (without illustrations in Longoria, 1974, pl. 54)
1988 Hedbergella delrioensis Carsey. - Gasinski : 231, 233 fig. 11l-o, fig. 12a-i
Pflaumann & Krasheninnikov (1977):
1926 Globigerina cretacea var. delrioensis Carsey. - Carsey : p.43
1974 Hedbergella delrioensis Carsey. - Longoria : p.54 pl. 10; fig. 1-3 (neotype)
1977 Hedbergella delrioensis Carsey. - Pflaumann & Krasheninnikov : p.555 pl. 2; fig. 7a-c
Was used in synonym list of:
Hedbergella infracretacea Glaessner 1937
Blefuscuiana infracretacea Glaessner 1937
References:

Carsey,D.O. (1926):
Foraminifera of the Cretaceous of Central Texas . University of Texas Bulletin Vol. 2612 p. 1-56

Glaessner,M.F. (1937):
Planktonische Foraminiferen aus der Kreide und dem Eozän und ihre stratigraphische Bedeutung.
In: Studies in Micropaleontology Vol. 1(1) p. 27-46

Tappan,H. (1940):
Foraminifera from the Grayson Formation of northern Texas . Journal of Paleontology Vol. 14 p. 93-126

Williams-Mitchell,E. (1948):
The zonal value of foraminifera in the chalk of England . Proceedings of the Geologist\'s Association, London Vol. 59 p. 91-112

Brönnimann,P. (1952):
Globigerinidae from the upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B.W.I. . Bulletins of American paleontology Vol. 34 p. 5-71

Frizzell,D.L. (1954):
Handbook of Cretaceous foraminifera of Texas . Texas Univ., Bur. Econ. Geol., Rept. Invest. Vol. 22 p. 1-232(pls.1-21)

Banner,F.T. and Blow,W.H. (1959):
The classification and stratigraphical distribution of the Globigerinaceae . Paleontology Vol. 1(2) p. 1-27

Bolli,H.M. (1959):
Planktonic foraminifera from the Cretaceous of Trinidad, B.W.I. . Bulletins of American Paleontology Vol. 39 p. 257-277

Loeblich,A.R. and Tappan,H. (1961):
Cretaceous planktonic foraminifera: Part I-Cenomanian . Micropaleontology Vol. 7 p. 257-304

Longoria,J.F. (1974):
Stratigraphic, morphologic and taxonomic studies of Aptian planktonic Foraminifera . Revista Espanola de MicropaleontologíaNo extraord p. 1-107

Pflaumann,U. and Krasheninnikov,V.. (1977):
Early Cretaceous planktonic foraminifers from eastern North Atlantic, DSDP Leg 41 .
In: Initial Reports of the Deep Sea Drilling Project 41 , Abidjan, Ivory Coast, to Malaga, Spain, February-April 1975 Eds: Gardner, J..Herring, J.. p. 539-564

Caron,M. (1985):
Cretaceous planktic foraminifera.
In: Plankton stratigraphy Eds: Bolli, H.M.Saunders, J.B.Perch-Nielsen, K. p. 17–86

Gasinski,M.A.. (1988):
Foraminiferal biostratigraphy of the Albian and Cenomanian sediments in the Polish part of the Pieniny Klippen Belt, Carpathian Mountains. . Cretaceous Research Vol. 9 p. 217-247

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