Fig. 1. Enveloping canals produced by folded outer lamellas. A-D: Lamellae in the peripheral portion of three successive chambers. Stereograph, schematic, not to scale. A: ultimate and penultimate chamber: red: inner lamella; green: outer lamella of ultimate chamber, white: outer lamella of penultimate chamber. B: addition of the next chamber with an inner lamella in red and an outer lamella in blue. C: addition of an other chamber with its outer lamella in yellow. D: superposition of lamellas B and C over the then final chamber A after two additional growth steps. E: SEM micrograph of the complete test of Calcarina defrancii d'Orbigny, ventral view, showing distribution of canal orifices over all the test including the canaliferous spines. F: SEM micrograph of an epoxy resin cast of the shell cavities in Calcarina gaudichaudii d'Orbigny cut in a direction perpendicular to the axis of the spiral shell, ventral view; G: detailed SEM micrograph of the ventral shell surface of C. gaudichaudii. Calcarinas from Keij Island, Indonesia. Recent. After Hottinger and Leutenegger, 1980. apil: axial pile of lamellae; ch: chamber and chamber lumen; co: canal orifice; csp: canaliferous spine; envc: enveloping canal; isc: intraseptal space or canal; il: inner lamella; lh: loop-hole; ol: outer lamella; p: pore; paf: perforate part of apertural face; ssk: supplemental skeleton; st: stolon; uc: umbilical canal network; uch: ultimate chamber suture, chamber walls broken off; (Hottinger, 2006; fig. 44) CC/BY-NC-SA)
- according to Hottinger (2006):
INTRASEPTAL INTERLOCULAR SPACE - the interlocular space formed between the posterior bilamellar wall of a chamber and the distal bilamellar wall of the preceding chamber, as a result of a deeply sunken suture. Intraseptal spaces may be open to the exterior along their margins either continuously or through openings between points of marginal adherence of consecutive lateral chamber walls.
Hottinger L. & Leutenegger S. (1980), The structure of calcarinid Foraminifera. Schweizerische Paläontologische Abhandlungen, Basel, N° 101, p. 115-151.
Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744
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