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Pygodus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Pygodontidae
Formal Genus Name and Reference:
Pygodus Lamont & LINDSTRÖM, 1957, p. 67
Type Species:
p. anserinus, OD
Images
(Click to enlarge in a new window)
Fig. 80, 3. *P. anserinus, Dalby Ls., Eu. (Sweden), 3a, b, stelliscaphate element, upper and lower views; 3c,d, tertiopedate element, lat. views, X 40 (Bergström, n)."
Synonyms
Haddingodus
Geographic Distribution
Eu.-N.Am.-Asia (China)-Australia
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Diagnosis as for family = Apparatus bimembrate (may possibly be tetramembrate, see below), composed of modified tertiopedate and stelliscaphate, lamellar elements. Tertiopedate elements with short central cusp, well-developed anterior and posterior processes, and short, laterally directed, adenticulate or weakly denticulate, lateral process; denticles of subequal size, reclined, laterally compressed, confluent along most of their length; basal cavity large and deep, extending over entire under side of processes. Stelliscaphate elements triangular in outline, flat to arched, with short cusp at posterior corner of unit, 3 to 4 rows of low, equal-sized denticles with characteristic surface microsculpture diverging from cusp, two of these rows lateral, forming margins of element, other rows central; whole under side of element occupied by wide but shallow basal cavity, in some with basal funnel. [Associated as a rule with the tertiopedate and stelliscaphate elements of several species of Pygodus, but always in much lower numbers, are elements originally described as Tetraprioniodus lindstroemi and Hibbardella pyramidalis by Sweet & Bergström (1962). They have some characters in common with the Pygodus elements, but their low frequency is difficult to explain if they are a part of the Pygodus apparatus. Apparatus reconstruction: BERGSTROM, 1971.]
References
Lamont, Archie, & Lindström, Maurits, 1957, Arenigian and Llandeilian cherts identified in the Southern Uplands of Scotland by means of conodonts, etc.: Trans. Edinburgh Geol. Soc., v. 17, pt. 1, p. 60-70, text-fig. 1, pl. 5.
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Pygodontidae
Formal Genus Name and Reference:
Pygodus Lamont & LINDSTRÖM, 1957, p. 67
Type Species:
p. anserinus, OD
Images
(Click to enlarge in a new window)
Fig. 80, 3. *P. anserinus, Dalby Ls., Eu. (Sweden), 3a, b, stelliscaphate element, upper and lower views; 3c,d, tertiopedate element, lat. views, X 40 (Bergström, n)."
Synonyms
Haddingodus
Geographic Distribution
Eu.-N.Am.-Asia (China)-Australia
Age Range
Beginning Stage in Treatise Usage:
M.Ord.
Beginning International Stage:
Dapingian
Fraction Up In Beginning Stage:
0
Beginning Date:
471.26
Ending Stage in Treatise Usage:
M.Ord.
Ending International Stage:
Darriwilian
Fraction Up In Ending Stage:
100
Ending Date:
458.18
Description
Diagnosis as for family = Apparatus bimembrate (may possibly be tetramembrate, see below), composed of modified tertiopedate and stelliscaphate, lamellar elements. Tertiopedate elements with short central cusp, well-developed anterior and posterior processes, and short, laterally directed, adenticulate or weakly denticulate, lateral process; denticles of subequal size, reclined, laterally compressed, confluent along most of their length; basal cavity large and deep, extending over entire under side of processes. Stelliscaphate elements triangular in outline, flat to arched, with short cusp at posterior corner of unit, 3 to 4 rows of low, equal-sized denticles with characteristic surface microsculpture diverging from cusp, two of these rows lateral, forming margins of element, other rows central; whole under side of element occupied by wide but shallow basal cavity, in some with basal funnel. [Associated as a rule with the tertiopedate and stelliscaphate elements of several species of Pygodus, but always in much lower numbers, are elements originally described as Tetraprioniodus lindstroemi and Hibbardella pyramidalis by Sweet & Bergström (1962). They have some characters in common with the Pygodus elements, but their low frequency is difficult to explain if they are a part of the Pygodus apparatus. Apparatus reconstruction: BERGSTROM, 1971.]
References
Lamont, Archie, & Lindström, Maurits, 1957, Arenigian and Llandeilian cherts identified in the Southern Uplands of Scotland by means of conodonts, etc.: Trans. Edinburgh Geol. Soc., v. 17, pt. 1, p. 60-70, text-fig. 1, pl. 5.