Home Plot Diversity Curves Tree of Life About Admin Login

Welcome to the Treatise on Invertebrate Paleontology!

Please enter a genera name to retrieve more information.

Search By:
and Class
and Order

Ductina

Classification

    Phylum:  
Unknown
    Class:  
Trilobata
    Order:  
Phacopida
    Superfamily:  
Phacopacea
    Family:  
Phacopidea
    Formal Genus Name and Reference:  
Ductina Richter & RICHTER, 1931
    Type Species:  
Phacopidella dictifrons Richter & RICHTER, 1923


Images

(Click to enlarge in a new window)

Fossil Image
Fig. 369, 2. *D. ductifrons (Richter & Richter), Ger. (Dill Basin), 2a, b, ceph., dorsal, side, 2c, ceph. margin from below, showing vincular furrows only at lateral extremities, × 0.9 (474n)


Synonyms



Geographic Distribution

Eu.


Age Range

    Beginning Stage in Treatise Usage:  
U. Dev.
    Beginning International Stage:  
Frasnian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
378.9
    Ending Stage in Treatise Usage:  
U. Dev.
    Ending International Stage:  
Famennian
    Fraction Up In Ending Stage:  
0
    Ending Date:  
359.3


Description

Cephalon semicircular, margin evenly rounded, glabella with anterolateral recurved wings, confluent with marginal border, 2p and 3p lateral glabellar furrows absent on surface, 1p disappearing in median part, "intercalating ring" undivided, eyes and palpebral lobes absent, facial sutures restricted entirely to margin (alone among Phacopidae), genal angles rounded, not truncated. Pygidium large, axis narrow, long, axial ridge present.




References



Museum or Author Information