They are typically ectoparasites that infest copepods, isopods, tanaids, amphipods and ostracods. It feeds on fish eggs, crustacean larvae, algae, ostracods, amphipods, copepods, and tunicates. Other invertebrates include ostracods, isopods, conchostracans, and bivalves. Texas was home to brachiopods, cephalopods, crinoids, gastropods, ostracods, trilobites during the Mississippian. They are ectoparasites that inhabit other crustaceans, namely ostracods, copepods, barnacles and malacostracans. Prey include cladocerans, dipteran larvae, annelids, chironomids, copepods, ostracods, and newly hatched snails. Animal taxa found in the lake include bivalves, gastropods and ostracods. Food items include small aquatic crustaceans (cladocerans, copepods and ostracods), aquatic dipterans and tadpoles. These may include fish, chaetognaths, krill, copepods, radiolarians, phytoplankton, nematocysts, ostracods and detritus. Juveniles feed on phytoplankton like diatoms and small zooplankton including cladocerans and ostracods. It feeds on zooplankton, particularly ostracods and copepods. Sediments left by the lake indicate the presence of gastropods, ostracods and stromatolites. There were also clam shrimps, sea urchins, ostracods, and molluscs. However, many other fossil remains may be helpful&colon; insects, ostracods, foraminifera, diatoms, etc. Malacostraca have haemocyanin as the oxygen-carrying pigment, while copepods, ostracods, barnacles and branchiopods have haemoglobins.