TaxonConcept: Praehedbergella sigali Moullade 1966 from: Moullade, M.Bellier, J.P.Tronchetti, G. (2002): Hierarchy of criteria, evolutionary processes and taxonomic simplification in the classification of Lower Cretaceous planktonic foraminifera . Cretaceous Research Vol. 23 p. 111-148

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Praehedbergella sigali Moullade 1966 from: Moullade, M.Bellier, J.P.Tronchetti, G. (2002): Hierarchy of criteria, evolutionary processes and taxonomic simplification in the classification of Lower Cretaceous planktonic foraminifera . Cretaceous Research Vol. 23 p. 111-148

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Species Praehedbergella sigali Moullade 1966

Discussion / Comments:

Boudagher-Fadel et al. (1997):
Remarks: In 1966, Moullade described this species from the Hauterivian of La Drôme and Les Basses-Alpes as well as from the Barremian of the Hautes-Alpes and (rarely) in the Lower Aptian. His six accompanying photographs (1966, plate 7, figs 20, 25) varied morphologically and would now be considered to belong to different species. Fortunately, the holotype (1966, plate 7, figs 24-25; refigured on our Plate 7.3, Figs 7, 8) was photographed both ventrally and dorsally and shows the presence of subglobular chambers (h/L = 0.6), separated by deep and narrow peripheral intercameral sutures (approaching 90°), and a very low, slit-like aperture. These characters can be used to recognize this species, sensu stricto; 'topotype' specimens would be no use, because they could belong to any other species which happened to occur in the same stratum at the same locality as the holotype. The specimens figured by Moullade (1966, plate 7, figs 22, 23; Plate 7.4, Figs 3, 4, herein) as paratypes were distinguished by Banner et al. (1993, p. 8) as P. sigali rasilis because this form has depressed chambers in the last whorl, which are about half as high as long, moderately depressed intercameral sutures, which form intercameral angles of about 140° at the periphery of the test, and a moderately lobate test outline (compared to the strongly lobate test of P. sigali ss.). The holotype of P. sigali rasilis was chosen to be the specimen figured by Gorbachik (1986, plate 24, fig. l , 2; reproduced in our Plate 7.4, Figs l , 2) which had been obtained by her from the Late Barremian of the southwest Crimea. However, as we have not been able to obtain more specimens of this form, we have not been able to add further to the original diagnosis (1993) and for the moment consider it a possible synonym of P. sigali.

Systematics:

22
Superfamilia Globigerinaceae
  Familia Praehedbergellidae
   Subfamilia Praehedbergellinae
    Genus Praehedbergella
     Species Praehedbergella sigali

Synonym list:

Moullade et al. (2002):

1966 Hedbergella (Hedbergella) sigali Moullade. - Moullade : p.87 pl 7 figs 20-25

1988 Praehedbergella grigelisae Banner & Desai. - Banner & Desai : p.154 pl 2 figs 8-13

1994 Hedbergella sigali Moullade. - Coccioni & Premoli Silva : p.677 fig 12:13-21

Boudagher-Fadel et al. (1997):

p 1966 Hedbergella (Hedbergella) sigali Moullade. - Moullade : p. 87, 88 pl. 7; fig. 21-25 (non fig. 20)

1985 Hedbergella sigali Moullade. - Caron : p.59 fig. 25.21-22

1986 Clavihedbergella sigali Moullade. - Gorbatchik : pl. 24; fig. 1, 2

1993 Praehedbergella sigali Moullade. - Banner et al. : p.7 pl. 2; fig. 2a-c

? 1993 Praehedbergella sigali rasilis Banner et al.. - Banner et al. : p.8

1995 Praehedbergella sigali Moullade. - Boudagher-Fadel : p.142 pl. 2; fig. 1, 2

1997 Praehedbergella sigali sensu stricto Moullade. - Boudagher-Fadel et al. : p. 117, 119 pl. 7.3, fig. 4-8; pl. 7.4, fig. 1-4; Figure: 7.1

References:

Moullade,M. (1966):
Etude stratigraphique et micropaléontologique du Crétacé inférieur de la "fosse vocontienne" . Documents des Laboratoires de Géologie de la Faculté des Sciences de Lyon Vol. 15 p. 1-369

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

Gorbatchik,T.N. (1986):
Jurassic and Early Cretaceous planktonic foraminifera of the south of the USSR [in Russian]. p. 239

Banner,F.T. and Desai,D. (1988):
A review and revision of the Jurassic-Early Cretaceous Globigerinina, with special reference to the Aptian assemblages of Speeton (North Yorkshire, England) . J. micropalaeontol. Vol. 7(2) p. 143-185

Banner,F.T.; Copestake,P.. and White,M.R.. (1993):
Barremian-Aptian Praehedbergellidae of the North Sea area: a reconnaissance . Bulletin of The Natural History Museum, London (Geology) Vol. 49 p. 1-30

Coccioni,R. and Premoli Silva,I. (1994):
Planktonic foraminifera from the Lower Cretaceous of Rio Argos sections (southern Spain) and biostratigraphic implications . Cretaceous Research Vol. 15 p. 645–687

Boudagher-Fadel,M.K. (1995):
The planktonic foraminifera of the Early Cretaceous of Tunisia compared to those of western and central Tethys . Paleopelagos Vol. 5 p. 137-160

Boudagher-Fadel,M.K.; Banner,F.T.; Whittaker,J.E. and Simmons,M.D. (1997):
Early Evolutionary History of Planktonic Foraminifera. Vol. 1

Moullade,M.; Bellier,J.P. and Tronchetti,G. (2002):
Hierarchy of criteria, evolutionary processes and taxonomic simplification in the classification of Lower Cretaceous planktonic foraminifera . Cretaceous Research Vol. 23 p. 111-148

Anonymous: Unedited TaxonConcept data

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