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Species similar to Didemnum spp. Click here to go back to Ecology tab Didemnum albidum Didemnum sp differs from most types of sea squirts in having spiny, calcareous balls embedded in the surface of its matrix. Three related species on the Pacific Coast, Didemnum carnulentum, Didemnum albidum and Trididemnum opacum, have similar spiny balls but these are embedded in both the surface and deeper parts of the matrix; the colonies are always flat and encrusting, never lobed; and are predominantly white or gray, in contrast to the mainly tan, yellow or orange colonies of Didemnum sp. Didemnum carnulentum Didemnum sp. differs from most types of sea squirts in having spiny, calcareous balls embedded in the surface of its matrix. Three related species on the Pacific Coast, Didemnum carnulentum, Didemnum albidum and Trididemnum opacum, have similar spiny balls but these are embedded in both the surface and deeper parts of the matrix; the colonies are always flat and encrusting, never lobed; and are predominantly white or gray, in contrast to the mainly tan, yellow or orange colonies of Didemnum sp. Trididemnum opacum Didemnum sp differs from most types of sea squirts in having spiny, calcareous balls embedded in the surface of its matrix. Three related species on the Pacific Coast, Didemnum carnulentum, Didemnum albidum and Trididemnum opacum, have similar spiny balls but these are embedded in both the surface and deeper parts of the matrix; the colonies are always flat and encrusting, never lobed; and are predominantly white or gray, in contrast to the mainly tan, yellow or orange colonies of Didemnum sp.