Pygidium - Wikipedia The pygidium (pl : pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites In groups other than insects, it contains the anus and, in females, the ovipositor
Cephalon Pygidium Relationships - Trilobites The pygidium is a tail piece composed of a variable number of fused segments at the posterior end of a trilobite While the cephalon of a trilobite is typically wider than the thorax, and one of the single largest major features of a trilobite body, the pygidium can range from extremely small to larger than the cephalon There are four general
Pygidium - Encyclopedia. com pygidium (adj pygidial) The posterior part of the exoskeleton of a trilobite (Trilobita); it is generally formed by the fusion of several body segments but in some Cambrian forms consisting of a single segment Many Cambrian trilobites have small pygidia and are said to be ‘micropygous’
Pygidium - an overview | ScienceDirect Topics The Pygidium The pygidium may be a rounded or tapering simple structure with the anus opening either dorsally or terminally, but frequently it carries anal (or pygidial) cirri Commonly one or two pairs of cirri are present, but in some taxa it may be ornamented with numerous cirri or flattened lamelliae (e g , maldanids), and in the opheliids
Pygidium - definition of pygidium by The Free Dictionary Define pygidium pygidium synonyms, pygidium pronunciation, pygidium translation, English dictionary definition of pygidium n pl py·gid·i·a The posterior body region or segment of certain invertebrates py·gid′i·al adj American Heritage® Dictionary of the English Language,
What does pygidium mean? - Definitions. net The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites In groups other than insects, it contains the anus and, in females, the ovipositor
Pygidium From Greek 'pygidion', meaning 'small rump' The pygidium of a scorpion is often covered with sensory hairs that help detect vibrations The term pygidium specifically refers to the rearmost segment of the body, distinct from other abdominal segments or body parts
A metameric origin for the annelid pygidium? - PMC Annelids display broad morphological diversity but many species are among the most homonomous metameric animals The front end (prostomium) and tail piece (pygidium) of annelids are classically described as non-segmental However, the pygidium structure and development remain poorly studied