The straight middle section (keel) of a C-shaped sponge spicule, joining the curved and pointed ends (prorae). Obsolete. rare.
| 单词 | θ31929 |
| 释义 | the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [noun] > member of > parts of > sponge spicule > keel of C-shaped sponge-spicule (1) tropis1887 The straight middle section (keel) of a C-shaped sponge spicule, joining the curved and pointed ends (prorae). Obsolete. rare. |
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