File:EB1911 Sponges - Typical Siliceous Megascleres.jpg
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EB1911_Sponges_-_Typical_Siliceous_Megascleres.jpg (742 × 503 pixels, file size: 80 KB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:42, 2 October 2018 | 742 × 503 (80 KB) | Bob Burkhardt | {{Information |description ={{en|1=Typical siliceous megascleres: ''a'', Diactinal monaxon (oxeate). ''b'', Style. ''c'', Triact. ''d'', Primitive tetraxon (calthrops). ''e'', Hexact. ''f'', Polyaxon desma. ''g'', Sterraster (often regarded as a microsclere). ''h'', Part of section of sterraster, showing two rays united by intervening silica. }} |date =published 1911 |source =“Sponges,” ''Encyclopædia Britannica'' (11th ed.), v. 25, 1911, p. 722, fig. 26.... |
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