File:EB1911 Sponges - Plakina monclopha (2).jpg
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DescriptionEB1911 Sponges - Plakina monclopha (2).jpg |
English: Plakina monclopha (a sponge):
Spicules, a-e, tetracts or calthrops; f-k, triacts or triradiates; l-t, diacts, showing how the monaxon form (1) may be derived from the primitive tetract (a) by suppression of actines. |
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Date | published 1911 | ||||
Source | “Sponges,” Encyclopædia Britannica (11th ed.), v. 25, 1911, p. 717, fig. 5. | ||||
Author | After F. E. Schulze. From a plate in Zeitschrift für Wissen. Zoologie. | ||||
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:06, 23 September 2018 | 828 × 445 (73 KB) | Library Guy (talk | contribs) | {{Information |description ={{en|1=''Plakina monclopha'' (a sponge): Spicules, ''a-e'', tetracts or calthrops; ''f-k'', triacts or triradiates; ''l-t'', diacts, showing how the monaxon form (1) may be derived from the primitive tetract (''a'') by suppression of actines. }} |date =published 1911 |source =“Sponges,” ''Encyclopædia Britannica'' (11th ed.), v. 25, 1911, p. 717, fig. 5. |author =After F. E. Schulze. From a plate in ''Zeitschrift für Wissen. Zoologie... |
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