Marionfyfea carnleyi is a species of land planarian from Sub-Antarctic Islands of New Zealand.

[1] Marionfyfea carnleyi measures about 1 to 2 cm in length.

The dorsum is cream and has two broad dark brown lateral stripes, while the venter is uniformly cream.

[2] The eyes are arranged in a single row around the body margin, being more concentrated at the anterior end.

The pharynx is long and tubular.