Christmas Beetles
of New South Wales

Glossary
References




Pygidial Disc Texture

Locating the pygidium

The pygidium is the last visible dorsal segment of the abdomen and is the most posterior part of the body in dorsal view.

Figure 1. Dorsal view of Anoplognathus

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dorsal image of Anoplognathus sp.


Photo Figure 1 © Kindi Smith, Australian Museum

States of pygidial disc texture

The following states refer to the broad central area of the pygidium, excluding the margins which are often different.

There are two states

  1. impunctate, or visibly punctured but with smooth surface between punctures (Figure 2A)

  2. rugulose, if punctures present these are usually obliterated by the rough surface (Figure 2B)

Figure 2. Posterior view of pygidium

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pygidial disc surface texture - punctate, smooth between puncturespygidial disc surface texture - rugulose, punctures often obliterated
pygidial disc surface texture - larger image

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Photos Figure 2 © Kindi Smith, Australian Museum

 

Australian Museum
Copyright © Australian Museum 2016
Authors: Chris Reid & Kindi Smith
pygidium