Fig 4.

Alignments of homologous ITS2 regions of different Euduboscquella sequences. Compensatory changes in three different base-paired stems from the ITS2 of selected Euduboscquella species define four different parasite ITS2 ribotypes. Only stem II from the parasite from Tintinnopsis major isolated from Annapolis Harbor, MD, is shown. The sole ITS2 compensatory change between the sequence from the parasite from T. major isolated from Annapolis Harbor, MD, and the sequences from the other two Tintinnopsis host morphotypes isolates from the Rhode River, MD, was found in stem II. No compensatory changes between parasites from these three host morphotypes in stems III or IV were found. There was also a single compensatory change in stem III found for the parasites from the three Tintinnopsis hosts from the Chesapeake Bay, MD (T. major, T. cf. subacuta, and Tintinnopsis sp. from the Rhode River), and the parasite isolated from a fourth Tintinnopsis sp. from Villefranche-sur-Mer.