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Haeckel says: The central capsule contains numerous spherical nuclei and is enclosed by the hyaline calymma, which forms conical sheaths around the spines.
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Peniscola, Valencia, Spain
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Grove, O, Galicia, Spain
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Amphilonche (amf-ee-lonk-chee) - an acantharean, the cytoplasm is attached to the radiating spicules by contractile myonemes. Two of the spicules are much longer than the others. This is an example of one of the four types of large amoebae which commonly occur in the marine water colum. Dark ground image by Dave Caron.
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Hexaconus serratus.
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Peniscola, Valencia, Spain
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Haeckel says: Lower left- Central base of an equatroial spine. Lower right: Central base of a tropical spine.
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Grove, O, Galicia, Spain
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Live specimen, from the Bay of Villefranche, September 19 2012. Composite image of two focal planes showing the frame and one set of the interior spines of the skeleton. See the video on the Aquaparadox site - video page. or YouTube (search Lithoptera)
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Grove, O, Galicia, Spain
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Lithoptera fenestrata - focusing through the skeleton to show the complicated 3-D structure