O

Oahu tree snails. See Agate snails Oasisia spp., 2:91 Obligatory symbiosis, 2:31

See also Behavior Oceanic leeches. See Marine leeches Oceanic squids, 2:475, 2:477, 2:478 Ocnerodrilidae, 2:65 Octochaetidae, 2:65 Octopodiformes, 2:475 Octopods, 2:25, 2:475-485, 2:481 behavior, 2:37, 2:477-478 conservation status, 2:479 distribution, 2:477 evolution, 2:475 feeding ecology, 2:29, 2:478 habitats, 2:477

humans and, 2:479-480 physical characteristics, 2:475-477 reproduction, 2:23, 2:478-479 species of, 2:483-485 taxonomy, 2:475 Octopus vulgaris. See Common octopods Octopuses. See Octopods Odontodactylus scyllarus. See Peacock mantis shrimps

Oegopsida. See Oceanic squids Oenonidae, 2:46

Oithona plumífera, 2:302, 2:307-308

Oligobrachia ivanovi. See Black oligobrachias

Oligochaeta. See Earthworms

Ommastrephids, 2:476

Ommatoiulus spp., 2:365

On the Origin of Species, 2:7

Onchidiidae, 2:411, 2:413

Onchidium verruculatum, 2:416, 2:421

Onchnesoma spp., 2:98

Oniscidae, 2:250

Oniscidea, 2:249

Oniscus asellus. See Common shiny woodlice Ontogeny, 2:15

Onychodiaptomus sanguineus, 2:302, 2:305 Onychophorans, 2:14, 2:109, 2:109-114 behavior, 2:37, 2:110 conservation status, 2:111 distribution, 2:110 evolution, 2:9, 2:109 feeding ecology, 2:110 habitats, 2:110 humans and, 2:111 physical characteristics, 2:109-110 reproduction, 2:17, 2:23, 2:110 species of, 2:113-114 taxonomy, 2:109 Onychoteuthis spp., 2:37 Oocytes, 2:16-17, 2:23 See also Reproduction Oogenesis, 2:17

See also Reproduction Opiliones, 2:333, 2:335 Opisthobranchia. See Sea slugs Opisthopthalmus spp. See Smooth-headed scorpions Opossum shrimps. See Mysids Opportunistic symbiosis, 2:31

See also Behavior Orange mantis shrimps, 2:167 Orb snails, 2:412

Orchestoidea californiana. See Beach hoppers

Organelles, 2:8

Origins of life, 2:8-11

Orthoporus ornatus, 2:364, 2:365

Orthoptera, 2:36

Orthurethra, 2:411

Orzeliscus spp., 2:118

Ostracoda. See Mussel shrimps

Ostreidae, 2:452

Ottoia prolifica, 2:97

Oweniidae, 2:47

Oxygen, origins of life and, 2:8-9 Oxyopidae, 2:37 Oysters, 2:43, 2:454 black-lipped pearl, 2:455, 2:461-462 eastern American, 2:455, 2:457, 2:459 pearl, 2:454 See also Bivalves Ozobranchus spp., 2:76

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