THE detailed classification of the Tunicata, and especially of the so-called “Compound Ascidians,” has usually been found a matter of special difficulty by systematists, and each successive ...

The genera Ectospinula Opitz, new genus, and Prosymnus Laporte, which comprise a monophyletic group within Korynetinae, are reviewed. Ectospinula is monotypic and includes E. graduata Opitz, new ...