intertidal

is likely misspelled.

has no English definition.

As an adjective intertidal

is pertaining to the part of a shore between the high water and the low water.

As adjectives the difference between intertidal and pelagic

is that intertidal is pertaining to the part of a shore between the high water and the low water while pelagic is (biology) living in the open sea rather than in coastal or inland waters.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective intertidal is

pertaining to the part of a shore between the high water and the low water.

As adjectives the difference between intertidal and subtidal

is that intertidal is pertaining to the part of a shore between the high water and the low water while subtidal is below the level of the tide.

As adjectives the difference between intertidal and supralittoral

is that intertidal is pertaining to the part of a shore between the high water and the low water while supralittoral is situated in the region of low-lying land nearest the shore.

As a noun supralittoral is

the region of low-lying land closest to the shore, but subject to seasonal or occasional flooding; in marine environments, usually excluding the intertidal zone.