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hydropore, gonopore and accessory thecal respiratory structures. A.Crinozoa B.Blastozoa C.Asterozoa D.Homalozoa E.Echinozoa ___ 77. Trilobites were present in ancient ? environments. A.marine B.freshwater C.trilobites were present in both marine and freshwater environments ___ 78. Isofilibranchs, pteriomorphs, and the anomalodesmatans are types of A.scaphopods B.monoplacophorans C.cephalopods D.gastropods E.bivalves ___ 79. Within the ?, the calyx is tightly sutured and there are many long, erect, and typically pinnulate arms. A.Crinozoa B.Blastozoa C.Asterozoa D.Homalozoa E.Echinozoa ___ 80. The most important modern reef-building corals are ? corals. A.tabulate B.rugose C.scleractinian D.all of the above are important modern reef-building corals E.none of the above is a reef-building coral ___ 81. Dentition, ligament insertion, adductor muscle scars, and pallial line morphology are important for classification of A.bivalves B.cephalopods C.monoplacophorans D.gastropods E.all of the above ___ 82. Horseshoe crabs, spiders, and eurypterids belong to the A.Trilobitomorpha B.Crustacea C.Chelicerata D.Myriapoda E.Hexapoda ___ 83. Which of the following is a "cystoid"? A.Diploporita B.Rhombifera C.all of the above D.none of the above ___ 84. The Archaeogastropoda, Mesogastropoda, and Neogastropoda belong to the A.Pulmonata B.Opisthobranchia C.Prosobranchia D.all of the above E.none of the above ___ 85. Trilobites have ? appendages. A.uniramous B.biramous C.some appendages are uniramous, others are biramous ___ 86. Which of the following is a coleoid? A.cuttlefish B.octopus C.belemnite D.squid E.all of the above are coleoids ___ 87. Corals, sea anemonies, and jellyfish, are referrable to the A.Porifera B.Mollusca C.Bryozoa D.Archaeocyatha E.Cnidaria ___ 88. The barnacles belong to the A.Branchiopoda B.Cirripedia C.Malacostraca D.Arachnida E.Insecta ___ 89. The skeleton of arthropods is primarily made of A.calcium carbonate B.calcium phosphate C.chitin D.silica E.all of the above ___ 90. Bryozoa are A.vagile benthonic B.sessile benthonic C.planktonic D.nektonic E.all of the above
