Rubzov and Platonova (1974) erected the new family Marimermithidae including
Marimermis together
with two other genera,
Trophomera Rubzov & Platonova, 1974
and Thalassonema Ward, 1933, which
were the only genera known at the time.
Later, the genera Ananus Rubzov,
1977, Acronema Rubzov, 1978 and
Australonema Tchesunov & Spiridonov,
1985 were described and included in Marimermithidae
(Rubzov, 1977, 1978, 1985a,b; Tchesunov
& Spiridonov, 1985).
Rubzov (1980, 1985b) also proposed a new order, Marimermithida Rubzov,1980,
including the genera
Benthimermis Petter, 1980,
Abos Rubzov, 1980, and
Adenodelphis Petter, 1983.
These genera, however, differ from one
another in significant morphological features.
Benthimermis contrary to
Marimermis and allies has an abnormal
alimentary tract, namely a trophosome built of big cells retaining only a thin
capillary lumen, scarcely connected within the reduced pharynx and rectum.