Page 210 - (DK) Ocean - The Definitive Visual Guide

208 INTRODUCTION TO OCEAN LIFE

FLATWORMS CHITONS
CLASS Polyplacophora ORDERS 3 SPECIES 970
PLATYHELMINTHES
PHYLUM Platyhelminthes CLASSES 6 SPECIES 20,000 ARTHROPODS
XENACOELMORPHA PHYLUM Arthropoda SUBPHYLA 4 SPECIES About 1.25 million
PHYLUM Xenacoelomorpha CLASSES 2 SPECIES 430
CRUSTACEANS
SUBPHYLUM Crustacea CLASSES 6 SPECIES 61,710
RIBBON WORMS WATER FLEAS AND RELATIVES
PHYLUM Nemertea CLASSES 2 SPECIES 1,358 CLASS Branchiopoda ORDERS 3 SPECIES 900
SEGMENTED WORMS BARNACLES AND COPEPODS
PHYLUM Annelida CLASSES 2 SPECIES 15,000 CLASS Maxillopoda ORDERS 27 SPECIES 16,589
MUSSEL SHRIMPS
BOTTOM-LIVING PHYLA CLASS Ostracoda ORDERS 5 SPECIES 7,462
MALACOSTRACANS
MEMBERS OF THE FOLLOWING PHYLA all live in or on the ocean floor.
The list is not comprehensive—the following phyla are among those not CLASS Malacostraca ORDERS 15 SPECIES 36,759
included: Entoprocta, Acanthocephala, Placozoa, and Cephalorhyncha. MANTIS SHRIMPS
ORDER Stomatopoda FAMILIES 17 SPECIES 480
SPOON WORMS
PHYLUM Echiura CLASSES 1 SPECIES 197 ISOPODS
ORDER Isopoda FAMILIES 94 SPECIES 11,515
LAMP SHELLS
PHYLUM Brachiopoda CLASSES 3 SPECIES 393 AMPHIPODS
ORDER Amphipoda FAMILI ES 119 SPECIES 10,158
HORSESHOE WORMS
PHYLUM Phoronida CLASSES 1 SPECIES 16 KRILL
ORDER Euphausiacea FAMILIES 2 SPECIES 86
PEANUT WORMS LOBSTERS, CRABS, AND SHRIMPS
PHYLUM Sipuncula CLASSES 2 SPECIES 147
ORDER Decapoda FAMILIES 105 SPECIES 15,000
CYCLIOPHORANS + 10 MORE MINOR ORDERS
PHYLUM Cycliophora CLASSES 1 SPECIES 2
GASTROTRICHS CHELICERATES
PHYLUM Gastrotricha CLASSES 1 SPECIES 847 SUBPHYLUM Chelicerata CLASSES 13 SPECIES 71,004
SPIDERS, SCORPIONS, TICKS, AND MITES
ROUND WORMS CLASS Arachnida ORDERS 12 SPECIES 70,000
PHYLUM Nematoda CLASSES 2 SPECIES 20,000
HORSESHOE CRABS
PRIAPULA WORMS AND MUD DRAGONS CLASS Merostomata ORDERS 1 SPECIES 4
PHYLUM Cephalorhyncha CLASSES 4 SPECIES 236
SEA SPIDERS
WATER BEARS CLASS Pycnogonida ORDERS 1 SPECIES 1,342
PHYLUM Tardigrada CLASSES 3 SPECIES 1,000
PTEROBRANCH WORMS AND ACORN WORMS HEXAPODS
PHYLUM Hemichordata CLASSES 3 SPECIES 130 SUBPHYLUM Hexapoda CLASSES 4 SPECIES About 1.11 million
INSECTS
CLASS Insecta ORDERS 29 SPECIES 1.1 million
MOLLUSKS
PHYLUM Mollusca CLASSES 8 SPECIES 73,682 + 1 OTHER NON-MARINE SUBPHYLUM, MILLIPEDES AND CENTIPEDES (MYRIAPODA)
CAUDOFOVEATES BRYOZOANS
CLASS Caudofoveata ORDERS 1 SPECIES 131
PHYLUM Bryozoa CLASSES 3 SPECIES 6,085
SOLENOGASTRES
CLASS Solonogasters ORDERS 4 SPECIES 273 ECHINODERMS
MONOPLACOPHORANS PHYLUM Echinodermata CLASSES 5 SPECIES 7,278
CLASS Monoplacophora ORDERS 1 SPECIES 30 SEA LILIES AND FEATHER STARS
CLASS Crinoidea ORDERS 4 SPECIES 638
TUSK SHELLS
CLASS Scaphopoda ORDERS 1 SPECIES 571 STARFISH
CLASS Asteroidea ORDERS 8 SPECIES 1,851
BIVALVES ORDERS 17 SPECIES 9,209 BRITTLESTARS ORDERS 2 SPECIES 2,074
CLASS Bivalvia
OCEAN LIFE GASTROPODS ORDERS 16 SPECIES 61,682 SEA URCHINS ORDERS 16 SPECIES 1,716
CLASS Ophiuroidea
CLASS Gastropoda
SPECIES 999
CLASS Echinoidea
CEPHALOPODS
SEA CUCUMBERS
ORDERS 6
SPECIES 816
CLASS Cephalopoda
KINGDOM Holothuroidea
ORDERS 9