Order Phacopida:

Suborder Phacopina


This was the last of the three suborders to be identified by Struve in the 1930's. The cephalon contains proparian sutures. The schizochroal eyes of Phacopina are generally well developed. The glabella expands forward and sometimes has genal spines, but these are usually lacking. It has no rostral plate. The thorax typically has 10-11 segments with a furrowed pleurae and tip either rounded, angular or spinose. The pygidium is usually smaller than the cephalon and is smooth or spinose. The diagram below shows the main features of this suborder. The photographs below are a selection of specimens of this suborder.

 

 

Suborder Phacopina

 Superfamily Phacopacea

Family Phacopidae

Subfamily Phacopinae

Genus Reedops

Species cephalotes

 Reedops cephalotes with main features of this suborder labelled

 

 

 

 

 Phacops sp. showing slight enrollment of the lower thorax and pygidium

 Phacops sp. showing pygidium and deep axial furrows

 Dalmanites sp. cephalon showing forward expanding glabella

 

 

 Dalmanites sp. enrolled, showing cephalon and eyes to either side and pygidium tucking under the cephalon

 Dalmanites sp. enrolled, view from top showing thoracic segments interlocking

 Dalmanites sp. from the Silurian

 

 

 Dalmanites limilurus with well developed genal and pygidial spines and well developed eyes (Photograph from www.wikipedia.org)

 



Author: Sarah Vinnell
Last updated: 21/11/05
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