Difference between revisions of "Basal layer"
(Created page with " File:Fig 18.jpg|thumb|<font size="2">'''Fig. 1.''' Basal layer and flosculinisation. '''A:''' Unidentified, large miliolid, ''Fabularia roselli'' Caus and ''Dendritina sp....") |
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| − | ''Remarks:'' The basal layer is a very important element of the architecture of imperforate foraminifera. In spiral-involute and miliolid shells it may become much thicker than the external chamber wall ([[flosculinisation]]); in fusiform shells it may form a double columella reaching both poles of coiling. Thickened basal layers often have numerous tubular passages of irregular shape connecting successive chamber lumina, with (edomiids) or without (elongate alveolinids) intermediate [[preseptal]] spaces. In our view the basal layer is homologous with the "basal skeleton" of fusulinids ( | + | ''Remarks:'' The basal layer is a very important element of the architecture of imperforate foraminifera. In spiral-involute and miliolid shells it may become much thicker than the external chamber wall ([[flosculinisation]]); in fusiform shells it may form a double columella reaching both poles of coiling. Thickened basal layers often have numerous tubular passages of irregular shape connecting successive chamber lumina, with (edomiids) or without (elongate alveolinids) intermediate [[preseptal]] spaces. In our view the basal layer is homologous with the "basal skeleton" of fusulinids (chomata and derived structural elements). Where tubular chamberlets are vertically superposed, the basal layer may form regular floors parallel to the chamber roof, as in elongate ''Praealveolina''. |
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| + | ==See also== | ||
| + | *[[chamber lumen]] | ||
| + | *[[choma]] | ||
| + | *[[coil]] | ||
| + | *[[endoskeleton]] | ||
| + | *[[floor]] | ||
| + | *[[flosculinisation]] | ||
| + | *[[pillars]] | ||
| + | *[[preseptal]] | ||
| + | *[[septula]] | ||
