The Collaborative International Dictionary of English. 2000.
pygidia — n. (Zoology) posterior segment or caudal part of the body in some invertebrates … English contemporary dictionary
Pygidium — Py*gid i*um, n.; pl. {Pygidia}. [NL., fr. Gr. ?, dim. of ? the rump.] (Zo[ o]l.) The caudal plate of trilobites, crustacean, and certain insects. See Illust. of {Limulus} and {Trilobite}. [1913 Webster] … The Collaborative International Dictionary of English
pygidium — noun (plural pygidia) Etymology: New Latin, from Greek pygidion, diminutive of pygē rump Date: circa 1849 a caudal structure or the terminal body region of various invertebrates • pygidial adjective … New Collegiate Dictionary
Agnostida — Taxobox name = Agnostida fossil range = Early Cambrian – Late Ordovician image width = 300px image caption = Peronopsis interstrictus image2 caption = Agnostus pisiformis regnum = Animalia phylum = Arthropoda classis = Trilobita ordo = Agnostida… … Wikipedia
Harpetida — Taxobox name = Harpetida image width = 240px image caption = A Harpetida trilobite from Morocco. regnum = Animalia phylum = Arthropoda classis = Trilobita subclassis = Librostoma ordo = Harpetida subdivision ranks = Families subdivision =… … Wikipedia
Ptychopariida — Taxobox name = Ptychopariida image width = 230px image caption = Elrathia kingi regnum = Animalia phylum = Arthropoda classis = Trilobita subclassis = Librostoma ordo = Ptychopariida ordo authority = Swinnerton, 1915 subdivision ranks = Suborders … Wikipedia
Corynexochida — Holyoakia simpsoni, from Southern Australia. Scientific classification Kingdom: Animalia Phylum … Wikipedia
Lichida — Taxobox name = Lichida image caption = Terataspis grandis status = Fossil regnum = Animalia phylum = Arthropoda classis = Trilobita ordo = Lichida ordo authority = Moore, 1959 subdivision ranks = Superfamilies subdivision = *Superfamily… … Wikipedia
Cheiruridae — Temporal range: Ordovician–Devonian … Wikipedia
Ceraurus — Temporal range: Middle to Upper Ordovician Conservation status Fossil Scientific classification Kingdom: Animalia … Wikipedia
