Have you ever met a comb jelly, or ctenophore?.
This chapter explores the economic consequences of one such invasion with significant impacts on a valuable resident species: the introduction of the ctenophore (comb-jelly) Mnemiopsis leidyi in the Black Sea and its effects on the commercial anchovy (Engraulis encrasicolus) fishery.
some of the petalonameans share similarities with living ctenophores, the combjellies.