Chessboard pattern

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Fig. 1. Alternating arrangement of shell compartments in the three dimensions of space. Examples from Gulf of Aqaba, Red Sea; Recent; F-G: Alternating chamberlet arrangement in the third dimension producing a chessboard pattern, as in the spherical-concentric, globular shell of Sphaerogypsina globulus (Reuss), SEM graph of external view and centered section in transmitted light micrograph, coloured. H: Stereograph showing alternating chamberlets forming chessboard pattern. Schematic, not to scale; Colours: red and blue: alternating generations of shell compartments; green: nepiontic, early stages including proloculus. a; aperture; f: foramen; (Hottinger, 2006; fig. 8 [1] CC/BY-NC-SA)


  • according to Hottinger (2006):

CHESSBOARD PATTERN - a chamberlet arrangement in superposed chamberlet layers in alternating positions resembling those of a chessboard: in one layer, the position of the chamberlets corresponds to the black fields, in the following layer to the white fields, as in Sphaerogypsina. The outline of the chamberlets may be quadratic, polygonal or somewhat irregular. This three-dimensional array corresponds to the annular chamberlet arrangement, that is alternating radial positions in the second dimension.


Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744

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