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Cordylodus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Cordylododontidae
Formal Genus Name and Reference:
Cordylodus PANDER, 1856, p. 33
Type Species:
C. angulatus, SD Ulrich & BASSLER, 1926, p. 8
Images
(Click to enlarge in a new window)
Fig. 68, 3. *C. angulatus, L.Ord., USA (Texas), 3 a-c, rounded element, lat. view, transv. sec., and shape of basal cavity, 3 d-f, compressed element, lat. view, transv. sec., and shape of basal cavity, X100 (Miller, n).
Synonyms
Geographic Distribution
N.Am.-Eu.-Asia-Aus-tralia
Age Range
Beginning Stage in Treatise Usage:
U.Cam. (Corbinia apopsis Sub-zone)
Beginning International Stage:
Cambrian Stage 10
Fraction Up In Beginning Stage:
0
Beginning Date:
491
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Inferred bimembrate apparatus of two types of dolabrate ramiform elements, denticles 1 to 5 or more on posterior edge or on posterior process, basal cavity large, moderately deep to shallow, extending beneath posterior process, in some extending into one or more denticles, tip of basal cavity subparallel to sides of cusp or recurved anteriorly. Rounded element symmetrical or nearly so, cusp and denticles round to oval in cross section. Compressed element usually asymmetrical due to lateral bend of cusp and prominent lateral carina, both features lost in some advanced species, such species with symmetrical compressed elements. Cusp and denticles of compressed element strongly compressed laterally, both with sharp edges. Rounded element more distinctive, usually 2 to 3 times as abundant as compressed element, in advanced species, compressed element rare or absent. [The apparatus of the type species probably includes rounded elements described as C. angulatus PANDER and compressed elements described as C. prion LINDSTROM, 1955. Elements described as Pravognathus aengensis LINDSTROM, 1955, cannot be definitely excluded from the apparatus of the type species. SWEET & BERGSTROM (1972) suggested that the apparatus of C. angulatus includes elements described as C. rotundatus PANDER, but the latter more likely represents the rounded element of a separate species.]
References
Pander, C. H., 1856, Monographie der fossilen Fische des silurischen Systems der russischbaltischen Gouvernements: Akad. Wiss., St. Petersburg, 91 p., 1 text-fig., 7 pl .
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Proconodontacea
Family:
Cordylododontidae
Formal Genus Name and Reference:
Cordylodus PANDER, 1856, p. 33
Type Species:
C. angulatus, SD Ulrich & BASSLER, 1926, p. 8
Images
(Click to enlarge in a new window)
Fig. 68, 3. *C. angulatus, L.Ord., USA (Texas), 3 a-c, rounded element, lat. view, transv. sec., and shape of basal cavity, 3 d-f, compressed element, lat. view, transv. sec., and shape of basal cavity, X100 (Miller, n).
Synonyms
Geographic Distribution
N.Am.-Eu.-Asia-Aus-tralia
Age Range
Beginning Stage in Treatise Usage:
U.Cam. (Corbinia apopsis Sub-zone)
Beginning International Stage:
Cambrian Stage 10
Fraction Up In Beginning Stage:
0
Beginning Date:
491
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Inferred bimembrate apparatus of two types of dolabrate ramiform elements, denticles 1 to 5 or more on posterior edge or on posterior process, basal cavity large, moderately deep to shallow, extending beneath posterior process, in some extending into one or more denticles, tip of basal cavity subparallel to sides of cusp or recurved anteriorly. Rounded element symmetrical or nearly so, cusp and denticles round to oval in cross section. Compressed element usually asymmetrical due to lateral bend of cusp and prominent lateral carina, both features lost in some advanced species, such species with symmetrical compressed elements. Cusp and denticles of compressed element strongly compressed laterally, both with sharp edges. Rounded element more distinctive, usually 2 to 3 times as abundant as compressed element, in advanced species, compressed element rare or absent. [The apparatus of the type species probably includes rounded elements described as C. angulatus PANDER and compressed elements described as C. prion LINDSTROM, 1955. Elements described as Pravognathus aengensis LINDSTROM, 1955, cannot be definitely excluded from the apparatus of the type species. SWEET & BERGSTROM (1972) suggested that the apparatus of C. angulatus includes elements described as C. rotundatus PANDER, but the latter more likely represents the rounded element of a separate species.]
References
Pander, C. H., 1856, Monographie der fossilen Fische des silurischen Systems der russischbaltischen Gouvernements: Akad. Wiss., St. Petersburg, 91 p., 1 text-fig., 7 pl .