Welcome to the Treatise on Invertebrate Paleontology!
Please enter a genera name to retrieve more information.
Bergstroemognathus
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Rhipidognathidae
Formal Genus Name and Reference:
Bergstroemognathus SERPACLI, 1974, p. 39
Type Species:
Oistodus extensus Graves & ELLISON, 1941, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 82, 2. *B.extensus (GRAVES & ELLISON), San Juan F., S.Am. (Arg.); 2a,b, lat. views of tertiopedate elements, diagr., X 11; 2c,d, lat. views of segminate element, diagr., XI5; 2e, post. view of alate element, diagr., X 13; 2f, tertiopedate element, lat. view, X54; 2g, alate element, post. view, X25; 2h, segminate element, lat. view, X67 (Serpagli, 1974).
Synonyms
Geographic Distribution
N.Am. (N.Y.-Texas-Pa.-Newf.)-S.Am. (Arg.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Apparatus apparently trimembrate, consisting of alate, segminate, and tertiopedate hyaline elements, Alate elements with very short, indistinct, adenticulate posterior process, nearly bilaterally symmetrical, with multidenticulate lateral processes and basal cavity developed as subapical pit beneath cusp and narrow, shallow grooves along processes, Segminate elements basically coniform, geniculate, with long denticulate anterior process and reclined posterior cusp, basal cavity relatively wide beneath cusp but developed as shallow, narrow groove along entire anterior process, Tertiopedate elements asymmetrical to nearly symmetrical with prominent cusp, short denticulate or adenticulate posterior process, and short denticulate anterolateral process, Denticles of all elements laterally compressed and more or less confluent, without white matter. [For differences between Bergstroemognathus and Appalachignathus, see Appalachignathus. Apparatus reconstruction: SERPACLI, 1974.J
References
Museum or Author Information
Classification
Phylum:
Conodonta
Class:
Conodonta
Order:
Conodontophorida
Superfamily:
Prioniodontacea
Family:
Rhipidognathidae
Formal Genus Name and Reference:
Bergstroemognathus SERPACLI, 1974, p. 39
Type Species:
Oistodus extensus Graves & ELLISON, 1941, p. 13, OD
Images
(Click to enlarge in a new window)
Fig. 82, 2. *B.extensus (GRAVES & ELLISON), San Juan F., S.Am. (Arg.); 2a,b, lat. views of tertiopedate elements, diagr., X 11; 2c,d, lat. views of segminate element, diagr., XI5; 2e, post. view of alate element, diagr., X 13; 2f, tertiopedate element, lat. view, X54; 2g, alate element, post. view, X25; 2h, segminate element, lat. view, X67 (Serpagli, 1974).
Synonyms
Geographic Distribution
N.Am. (N.Y.-Texas-Pa.-Newf.)-S.Am. (Arg.)
Age Range
Beginning Stage in Treatise Usage:
L.Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
L.Ord.
Ending International Stage:
Floian
Fraction Up In Ending Stage:
100
Ending Date:
471.26
Description
Apparatus apparently trimembrate, consisting of alate, segminate, and tertiopedate hyaline elements, Alate elements with very short, indistinct, adenticulate posterior process, nearly bilaterally symmetrical, with multidenticulate lateral processes and basal cavity developed as subapical pit beneath cusp and narrow, shallow grooves along processes, Segminate elements basically coniform, geniculate, with long denticulate anterior process and reclined posterior cusp, basal cavity relatively wide beneath cusp but developed as shallow, narrow groove along entire anterior process, Tertiopedate elements asymmetrical to nearly symmetrical with prominent cusp, short denticulate or adenticulate posterior process, and short denticulate anterolateral process, Denticles of all elements laterally compressed and more or less confluent, without white matter. [For differences between Bergstroemognathus and Appalachignathus, see Appalachignathus. Apparatus reconstruction: SERPACLI, 1974.J