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Larcopyle pylomaticus (Riedel, 1958)

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Spongurus pylomaticus
Skeleton cylindrical, approximately twice as large as wide. Skeleton constructed of dense spongy tissue; just possible to distinguish striation on periphery corresponding to radial needles. Radial needles extending to exterior (often broken off), distributed irregularly: large number on poles of shell, where they are usually longer. In adult specimens spongy mass surrounded externally by thin "mantle" which has more formed pores than growing spongy tissue. Mantle not formed at one pole of shell where opening is present, in some degree corresponding to pylome. margin of pylome usually encircled by short irregular spikes. Age changes appear as absence of mantle in young specimens - these are somewhat constricted in middle and expanded at ends; radial striation more marked in them.
Dimensions: length of shell up to 225µ, width up to 125µ. Variation of dimensions often explained by constant growth of spongy shell.
Petrushevskaya 2005











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