Ecologie des foraminifères planctoniques du golfe de Gascogne ...

tel-00480660, version 1 - 4 May 2010
Species spine ? Morphology
G. bulloides d'Orbigny 1826 spinose
G. siphonifera
d'Orbigny
= G. aequilateralis
(Brady, 1897)
1839
G. calida Parker 1962
round and
triangular spines
round and
triangular spines
Misidentify specimen confused with other similar forms as G. falconensis or G. calida. 7 distinct genotypes (subdivised
in 2 gps: 1 tropical and one polar) (Darling and Wade; 2008) 2 differents populations of G. bulloides : 1 occur during the
winter bloom, sub polar adapted, and the other upwelling -indicating species (Ortiz and Mix, 1992; Kucera and Darling,
2002; Wilke et al., 2008)
2 morphology types, described in Faber et al 1988.
Problem to differenciate G. calida to G. siphonifera (de Vargas et al., 1997; de Vargas et al., 2002; Darling and Wade,
2008)
T. quinqueloba Natland 1938 spinose 6 genotypes (Darling and Wade, 2008)
G. glutinata Egger 1893 micrperforate
G. uvula Parker 1962 micrperforate
G. ruber (white) d'Orbigny 1839 round spines
G. trilobus trilobus Reuss 1850 round spines
G. trilobus sacculifer Brady 1877 round spines
G. hirsuta d'Orbigny 1839 no spinose
G.inflata d'Orbigny 1839 no spinose
G. scitula Brady 1882 no spinose
G. truncatulinoides senestre d'Orbigny 1839 no spinose
G. truncatulinoides dextre d'Orbigny 1840 no spinose
N. pachyderma dextre Ehrenberg 1861 no spinose
pachyderma senestre Ehrenberg 1861 no spinose
P-D intergrade-dutertrei d'Orbigny 1839 no spinose
O. universa d'Orbigny 1839
round and
triangular spines
Recent studies have shown that G. truncatulinoides corresponds to a complex of four genetic species adapted to
particular hydrographic conditions (de Vargas et al., 2001)
3 genotypes (Darling et Wade, 2008)
H. pelagica d'Orbigny triangular spines could have, during their cycle, spines of about 12mm (Anderson et Bé, 1976)