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Remarks on the shell structure of Halkyardia maxima Cimerman: its umbilical plug and the microspheric form

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The paper presents for the first time the structure of the microspheric form of Halkyardia maxima in axial and equatorial thin-section photomicrographs. A very small proloculus (10 μm in diameter) is followed by a spiral composed of 9 chambers, gradually increasing in size. The axial section of the megalospheric form shows that the umbilical plug is not a special morphological formation but results from the accretion of lamellae of consecutive cycles.
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Keywords: FORAMINIFERA; HALKYARDIA; MICROSPHERIC FORM; OLIGOCENE; PALEOGENE; SLOVENIA

Document Type: Research Article

Publication date: July 1, 2015

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