PICTORIAL GUIDE
TO THE ORDER LICHIDA


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Click here to return to Lichiida Fact Sheet some special terms for the Lichoid glabella:

Compare the pictorial approach above with the purely descriptive narrative below:
Superfamily Lichoidea

Introduction: medium to large trilobites, typically surface sculpturing involves two size classes of granules or tubercles. 
Cephalon: opisthoparian sutures, glabella broad, extending to anterior border, with unique complex structure (lateral glabellar and occipital lobes often fused with each other and with cranidium). 
Thorax: 10-11 segments, pleurae initially horizontal, bend retrograde at fulcrum, end in free points.
Pygidium: large, usually flattened, often with 3 pleural pairs of leaflike or spinose structures. 

Here are two representative Lichoidea

Dicranopeltis Arctinurus


LICHIDA includes three Superfamilies
Lichoidea

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Odontopleuroidea

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Dameselloidea

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Return to Lichida Fact Sheet


Return to Pictorial Guides to the Orders
PICTORIAL GUIDE START PAGE


AGNOSTIDA


 

REDLICHIIDA

CORYNEXOCHIDA

PHACOPIDA

ASAPHIDA

PROETIDA

LICHIDA

PTYCHOPARIIDA

HARPETIDA

stroll with me among the topics below...
Walking Trilobite animation 2000 by S. M. Gon III
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Summary Fact Sheets
diagnostic characters and detailed line drawings 

Trilobite Order Galleries
Click on any of the images below to be sent to a gallery featuring photos of trilobites in that Order 
Ptychagnostus (Ptychagnostidae)
Redlichia (Redlichiidae)
Olenoides (Dorypygidae)
Arctinurus (Lichidae)
Reedops (Phacopidae)
Homotelus (Asaphidae)
Proetus (Proetidae)
Bolaspidella (Menomoniidae)
Agnostida
Redlichiida
Corynexochida
Lichida
Phacopida
Asaphida
Proetida Harpetida
Ptychopariida
All line drawings this page 1999 - 2004 by S. M. Gon III

last revised 24 JAN 2004 by S. M. Gon III