parapodiumn.
/ˌparəˈpəʊdɪəm/, U.S. /ˌpɛrəˈpoʊdiəm/ Zoology.
1. A muscular lateral appendage occurring in pairs on the body segments of polychaete annelids, typically consisting of two lobes, bearing setae and sometimes gills, and variously used for locomotion, respiration, and sensation.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Annelida > [noun] > member of > parts of > parapodium
parapodium1856
parapod1890
1856 T. H. Huxley in Med. Times & Gaz. 12 July 27/2 Laterally the somite is produced into two thick processes..which I propose to denominate ‘parapodia’, as a single substantive term equivalent to the phrases ‘pedal tubercle’, ‘foot’, etc. Each parapodium divides at its extremity into two portions.
1877 T. H. Huxley Man. Anat. Invertebrated Animals v. 227 Those parapodia which lie in the vicinity of the mouth may be specially modified in form and direction, foreshadowing the jaws of the Arthropoda.
a1933 J. A. Thomson Biol. for Everyman (1934) I. ii. 17 Many of the marine kinds live an active life and have numerous unjointed bristle-bearing limbs (parapodia).
1978 Nature 4 May 24/1 Evolution of parapodia and intrinsic parapodial musculature would set the stage for the evolution of the arthropods.
1998 L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) iii. 276/1 Parapodia are unique to polychaetes; these thin, fleshy flaps protrude laterally from each body segment.
2. Either of two lateral lobes of the foot of certain gastropod molluscs (such as sea slugs), used as undulating fins in swimming.
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1904 Amer. Naturalist 38 212 From the mesopodium arise the parapodia; these are lateral lobes, or folds, like extrusions of the edges of the foot.
1965 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 6) I. 563 In some forms, such as the Sea-hares.., the foot develops a pair of lateral lobes—the parapodia—which act as fins; and in the Pteropods..these constitute the largest part of the foot.
1990 Sea Frontiers Dec. 58/1 They..have parapodia that look like a pair of wings wrapped over their backs.
This entry has been updated (OED Third Edition, June 2005; most recently modified version published online June 2022).
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n.1856