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Monoclimacis

Classification

    Phylum:  
Hemichordata
    Class:  
Pterobranchia
    Order:  
Graptoloidea
    Superfamily:  
Neograptina
    Family:  
Monograptidae
    Formal Genus Name and Reference:  
Monoclimacis FRECH, 1897, p. 621
    Type Species:  
*Graptolites vomerinus NICHOLSON, 1872a, p. 52, OD


Images

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Fossil Image
Fig. 293,3a-c. *M. vomerina (Nicholson), 3a, neotype (Strachan, 1971, p. 91), proximal end only, Riccarton Beds, Elliotsfield, Scotland (Zalasiewicz, 2000f, Atlas, Folio 1.48), 3 b-c, proximal end and distal fragment, BGS RCV2012, BGS RCV236, Buttington quarry, Wales (Loydell & Cave, 1993, fig. 7E-F). Scale bars, 5 mm.


Synonyms



Geographic Distribution

worldwide


Age Range

    Beginning Stage in Treatise Usage:  
Silurian, Llandovery (Rhuddanian, Cystograptus vesiculosus Biozone)
    Beginning International Stage:  
Rhuddanian
    Fraction Up In Beginning Stage:  
0
    Beginning Date:  
443.07
    Ending Stage in Treatise Usage:  
Wenlock (Homerian, Cyrtograptus lundgreni Biozone)
    Ending International Stage:  
Homerian
    Fraction Up In Ending Stage:  
0
    Ending Date:  
426.74


Description

Tubarium straight or dorsally curved proximally, sicula short, first theca originated via modified resorption porus or derived type, thecae geniculate, with supragenicular wall parallel to or less commonly inclined to axis of tubarium, apertural excavations semi-circular or semi-elliptical, commonly with overhanging hood, outgrowth of the dorsal wall, in some species, small number of proximal thecae hooked




References

Frech, Fritz. 1897. Lethaea Geognostica oder Beschreibung und Abbildung für die Gebirgs-Formationen bezeichnendsten Versteinerungen, Herausgegeben von einer Vereinigung von Palaeontologen, 1. Theil, Lethaea Palaeozoica. E. Schweizerbart'sche Verlagshandlung. Stuttgart. 690 p.


Museum or Author Information

Strachan, 1971, Zalasiewicz, 2000, Loydell & Cave, 1993