[3] Forty-one years later, Linton (1940) described M. furcata from the gills the same host collected near Woods Hole, off Massachusetts.

They concluded that Microcotyle furcata should be considered a junior subjective synonym of M.

[4] Thoney & Munroe provided a redescription and illustrations of Microcotyle hiatulae to complete the original description lacking data on intraspecific variation and some important taxonomic characters, and also described the postlarval development.

The digestive organs include an anterior, terminal mouth, a pharynx, an oesophagus and a posterior intestine with two branches of un equal lengths, provided with numerous bifurcating branches on the inner and outer sides and one of them extends much more backwards into the haptor.

[3][4] Thoney and Hargis found that formalin (250 ppm, 1 h) was ineffective against Microcotyle hiatulae on the gills of Tautoga onitis.