{{italictitle}} '''''C. solida''''' may refer to:
* ''Archips solidus'', a species of moth, synonymized as ''Cacoecia solida'' Meyrick, 1908 * ''Cellana solida'', a species of sea snail * ''Clathrodrillia solida'', the solid drillia, a species of sea snail * ''Clavaria fragilis'', fairy fingers, a fungus synonymized as ''Clavaria solida'' Gray, 1821 * ''Coelolepis solida'', an extinct species of jawless fish * ''Corydalis solida'', the fumewort, a flowering plant of northern Eurasia * ''Crepidula adunca'', a species of sea snail, synonymized as ''Crepidula solida'' Hinds, 1845 * ''Eucithara solida'', a species of sea snail, synonymized as ''Cytharopsis solida'' (Reeve, 1846)
{{Species Latin name abbreviation disambiguation}}