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
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 limulusand trilobite.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun zoology The
caudalplate of trilobites, crustacea, and certain insects.
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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.
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.
Median notch: in Coccidae, a notch in the edge of the pygidium, at the posterior extremity of the body.
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.
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.
[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.]
The relation in size between the flea and its pygidium.
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.
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.
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