pygidium

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py·gid·i·um

 (pī-jĭd′ē-əm)
n. pl. py·gid·i·a (-ē-ə)
The posterior body region or segment of certain invertebrates.
[New Latin, from Greek pugidion, diminutive of pugē, buttocks.]
py·gid′i·al (-ē-əl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

pygidium

(paɪˈdʒɪdɪəm; -ˈɡɪd-)
n, pl -ia (-ɪə)
(Zoology) the terminal segment, division, or other structure in certain annelids, arthropods, and other invertebrates
[C19: from New Latin, from Greek pugē rump]
pyˈgidial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

py•gid•i•um

(paɪˈdʒɪd i əm)

n., pl. -gid•i•a (-ˈdʒɪd i ə)
any of various structures or regions at the caudal end of the body in certain invertebrates.
[1840–50; < Greek pȳg(ḗ) rump + -idium]
py•gid′i•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Two enrolled exoskeletons (GUGM 1359, 1362), two cephalothoraxes (GUGM 1360, 1367), two cephala (including GUGM 1364), three incomplete cephala, three pygidia, and one thoracopygon (GUGM 1366); one cephalon (GUGM 1362), and one thoracopygon (GUGM 1365) from sample Gh-2.
No phacopid pygidia assignable to Omegops accipitrinus accipitrinus are reported from the type locality in the Pilton Quarry (North Devon, England); however, the phacopid cranidium (BGS GSM 7053) and associated pygidium (BGS GSM 7056) illustrated by Salter (1864, pl.
The latest Devonian (Famennian) phacopid trilobite Omegops from eastern Alborz, Iran
Great Basin exemplifies a morphotype wherein pygidia expanded rapidly during ontogeny.
A three dimensional comparison of ontogeny in two morphotypes of Cambrian Agnostid arthropods
umangivora in the arrangement of anterior notochaetae in three tiers, the number of modified spines on chaetiger 5 and the absence of notochaetae on chaetiger 5; they differ with respect to the shape of the notopodial lobes of chaetiger 1, the modified spines of chaetiger 5 have flange not lateral tooth, size of the pygidia, the maximum number of hooded hooks and lack of bristles on hoods (Williams 2001).
Polydora and Dipolydora (Polychaeta: Spionidae) associated with molluscs on the south coast of South Africa, with descriptions of two new species
Most commonly, the pygidia are preserved arranged horizontally, being generally oriented upside down, showing some degree of sorting processes.
The Early Ordovician trilobite distribution and zonation of the East Baltic/Ida-Balti Vara-Ordoviitsiumi trilobiitide levik ja tsonaalsus
Macrofossil assemblages are dominated by trilobites (mainly pygidia), but some beds contain also brachiopods and cephalopods.
The Cambrian--Ordovician succession at Lanna, Sweden: stratigraphy and depositional environments
Moreover, the pygidia identified with askerensis resemble those of Hemisphaerocoryphe, possessing only one pair of pleural spines between the stout anterior pair.
Revision of the Ordovician cheirurid trilobite genus Reraspis with the description of the earliest representative/Ordoviitsiumi cheiruriidse trilobiidiperekonna Reraspis revisjon koos selle varajasima esindaja kirjeldusega
Three encrusted illaenid pygidia and two encrusted illaenid cranidia were found (Figs 1, 2).
The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia
Sample MK-5/10, five cephala NMW 2012.45G.429-433, three pygidia NMW2012.45G.434436; sample MK-5/11, three cephala NMW2012.45G.307 (Fig.
First record of the Ordovician fauna in Mila-Kuh, eastern Alborz, northern Iran/Ordoviitsumi fauna esmaleid Pohja-Iraanis (Mila-Kuh, idapoolne Alborz)
Three cephala (NIGP152225, 152226, 152229) and three pygidia [XIGM Tr017 (Fig.
Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China/Loode-Hiina Gansu provintsi Alam-Kambriumi (provisoorne Kambriumi seeria 2) trilobiidid
They are considered as morphs and comprise specimens (cephala and/or pygidia) that deviate in some respect from the complete set that is diagnostic for previously recognized species.
Hirnantia sagittifera (Brachiopoda) and Mucronaspis mucronata s.l. (Trilobita) in the Upper Ordovician of the East Baltic: taxonomy and distribution/Hirnantia sagittifera (Brachiopoda) ja Mucronaspis mucronata s.l. (Trilobita) Baltikumi Ulem-Ordoviitsiumis: taksonoomia ning levik
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