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Perrinites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Shumarditoidea
Family:
Perrinitidae
Formal Genus Name and Reference:
Perrinites BÖSE, 1919, p. 155
Type Species:
P. vidriensis, OD
Images
(Click to enlarge in a new window)
Fig. 88, 2a. *P. vidriensis, Cathedral Mountain Formation, western Texas, diameter at 23 mm (Tharalson, 1984)., FIG. 88, 2b-d. P. hilli, Kungurian-Roadian, Texas, b-c, Leonard Formation, western Texas, × 1.33, d, Blaine Formation, northcentral Texas, diameter at 65 mm (Miller & Furnish, 1940a).
Synonyms
Perrimetanites
Geographic Distribution
Americas (widespread from Venezuela and Colombia to Idaho), Tajikistan (Pamir), Ukraine (?Crimea), Afghanistan (Bamyan Mountains), China (Xinjiang, Qinghai), Thailand (Saraburi Area, including Muak Lek), Indonesia (Timor)
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Guadalupian (Roadian)
Ending International Stage:
Roadian
Fraction Up In Ending Stage:
100
Ending Date:
269.21
Description
Advanced perrinitids that achieved conch diameters as great as 30 cm, at moderate size, whorls are equidimensional (H/W, 0.7-1.25), umbilicus small (Umin/D, 0.05-0.2), and hyponomic sinus deep. Mature sutures display 3 or 4 discrete first-order subdivisions on ventral flank of each prong of ventral lobe (V1), and 3 or 4 prominent subdivisions on each flank of dorsal lobe (D), second-order subdivisions are common in external sutures of large specimens. Umbilical lobe complex is somewhat variable, but formula commonly (V1 V1) L2 L1 L2.1 L2.2 U2 (U1.2 U1.1): (U2.2 U2.1) (I2.2 I2.1) I1 I2 D Russian. Six named species. [Ventral bifurcation (I 2.2 ) of the third dorsolateral lobe (I2 ) is almost completely suppressed in advanced species.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Shumarditoidea
Family:
Perrinitidae
Formal Genus Name and Reference:
Perrinites BÖSE, 1919, p. 155
Type Species:
P. vidriensis, OD
Images
(Click to enlarge in a new window)
Fig. 88, 2a. *P. vidriensis, Cathedral Mountain Formation, western Texas, diameter at 23 mm (Tharalson, 1984)., FIG. 88, 2b-d. P. hilli, Kungurian-Roadian, Texas, b-c, Leonard Formation, western Texas, × 1.33, d, Blaine Formation, northcentral Texas, diameter at 65 mm (Miller & Furnish, 1940a).
Synonyms
Perrimetanites
Geographic Distribution
Americas (widespread from Venezuela and Colombia to Idaho), Tajikistan (Pamir), Ukraine (?Crimea), Afghanistan (Bamyan Mountains), China (Xinjiang, Qinghai), Thailand (Saraburi Area, including Muak Lek), Indonesia (Timor)
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Artinskian)
Beginning International Stage:
Artinskian
Fraction Up In Beginning Stage:
0
Beginning Date:
290.51
Ending Stage in Treatise Usage:
Guadalupian (Roadian)
Ending International Stage:
Roadian
Fraction Up In Ending Stage:
100
Ending Date:
269.21
Description
Advanced perrinitids that achieved conch diameters as great as 30 cm, at moderate size, whorls are equidimensional (H/W, 0.7-1.25), umbilicus small (Umin/D, 0.05-0.2), and hyponomic sinus deep. Mature sutures display 3 or 4 discrete first-order subdivisions on ventral flank of each prong of ventral lobe (V1), and 3 or 4 prominent subdivisions on each flank of dorsal lobe (D), second-order subdivisions are common in external sutures of large specimens. Umbilical lobe complex is somewhat variable, but formula commonly (V1 V1) L2 L1 L2.1 L2.2 U2 (U1.2 U1.1): (U2.2 U2.1) (I2.2 I2.1) I1 I2 D Russian. Six named species. [Ventral bifurcation (I 2.2 ) of the third dorsolateral lobe (I2 ) is almost completely suppressed in advanced species.]