Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The posterior body region or segment of certain invertebrates.

from The Century Dictionary.

  • noun A posterior part of the body, in any way distinguished; an anal, caudal, or pygal part or organ: said chiefly of insects, crustaceans, and worms.
  • noun [capitalized] A genus of nematognaths, typical of the family Pygidiidæ. Later called Trichomycterus.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of limulus and trilobite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun zoology The caudal plate of trilobites, crustacea, and certain insects.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[New Latin, from Greek pugidion, diminutive of pugē, buttocks.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin pygidium, from Ancient Greek πυγή (pugē, "tail")

Examples

  • Ancestral ball-rolling behaviour shared by other canthonine species is abandoned, and the head, hind tibiae and pygidium of D. valgum are modified for novel functions during millipede predation.

    Archive 2009-01-01

  • Dorsal diaphragm: the wings of the heart, or the very thin membrane upon which these muscles rest: = pericardial diaphragm, q.v. Dorsal gland orifices: in Diaspinae, oval orifices arranged in more or less distinct rows on the surface of the pygidium, through which is discharged the material of which the dorsal scale is formed.

    Explanation of Terms Used in Entomology

  • Median notch: in Coccidae, a notch in the edge of the pygidium, at the posterior extremity of the body.

    Explanation of Terms Used in Entomology

  • Lobe: any prominent rounded process or excrescence on a margin: specifically, the rounded, tooth-like processes on the margin of the pygidium of the Diaspinae: also applied to lateral expansions of the abdominal segments.

    Explanation of Terms Used in Entomology

  • Coccidae, a more or less circular opening on the dorsal surface of the pygidium, varying in location as regards the circumgenital gland orifices: = anal orifice.

    Explanation of Terms Used in Entomology

  • [Footnote 5: The pygidium of the flea, very highly magnified, was here shown.] [Footnote 6: An illustration of the pygidium structure seen with one-thirty-fifth immersion was given.]

    Scientific American Supplement, No. 470, January 3, 1885

  • The relation in size between the flea and its pygidium.

    Scientific American Supplement, No. 470, January 3, 1885

  • It is known from its position as the _pygidium_; and from the extreme sensitiveness of the hairs to the slightest aerial movement, may be a tactile organ warning of the approach of enemies; the eyes have no power to see.

    Scientific American Supplement, No. 470, January 3, 1885

  • Antennae longer and more porrect; second submarginal cell as long as the third; abdomen broader at the base, its ventral surface concave; hypopygium scarcely carinated laterally, and pygidium prominent and deeply emarginate, its lateral edges produced into acute teeth.

    Journals of Two Expeditions of Discovery in North-West and Western Australia, Volume 2

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