Subclass ThecostracaBivalved carapace of cypris larva forms an enveloping mantle in the adult; parasitic forms recognizable only by larval stages.Subclass Cirripedia (barnacles)Late Silurian to present; sedentary; 6 pairs of trunk limbs (cirri); larvae free-swimming; sessile adults with carapace developed into a mantle; about…
Read More
