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Medlicottia
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Prolecanitida
Superfamily:
Medlicottioidea
Family:
Medlicottiidae
Formal Genus Name and Reference:
Medlicottia WAAGEN, 1880, p. 83
Type Species:
Goniatites orbignyanus de VERNEUIL, 1845, p. 378, OD
Images
(Click to enlarge in a new window)
Fig. 128a-q. *M. orbignyana (de Verneuil), Artinskian, a-c, hypotype, PIUB 9 of Haniel (1915, pl. 2, 8 a-c ), Timor, Bitauni, X 1 (new), d-p, ontogenetic succession of sutures, showing ventral prong of lateral lobe \\left ({L}_{1 {v}}\\right) commonly transformed into complexly subdivided first later saddle, Aktubinsk, Kazakhstan d-h, based on first individual, i-m, based on second, n-o, third, p, fourth, d, whorl height at 0.25 mm, e, 0.4 mm, f, 0.5 mm, g, 0.8 mm, h, 1 mm, i, 1.2 mm, j, 1.8 mm, k, 2.5 mm, l, 3.6 mm, m, 5.3 mm, n, 6.7 mm, o, 12 mm, and p, 33.8 mm (Ruzhentsev, 1949a), q, external suture, Aktubinsk, Kazakhstan, SUI 2048, diameter at 35 mm (whorl height estimated about 25 mm or so probably equal to the stage between o and p in Ruzhentsev's sequence (adapted from Miller & Furnish, 1940a).
Synonyms
Paramedlicottia
Geographic Distribution
Devon Island)
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Sakmarian)
Beginning International Stage:
Sakmarian
Fraction Up In Beginning Stage:
0
Beginning Date:
293.52
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch thinly lenticular, narrow furrowed venter bounded by pair of sharp ventrolateral keels (generally without nodes). Ventrolateral saddle has 8 to 12 subdivisions, remaining saddles rounded or slightly indented near midheight. External lateral lobe and adjacent umbilical lobes in arched alignment, subequal but decreasing in size to umbilicus. Sutural formula: (V2 V1 V2 )v1 v2 v3-6 s1 s1 l7- 5 l4 l3 l2 l1 L1(d) )UU1 U2 ..... [Russian]. Twenty-two named species (most are geographic designations that are too obscurely deļ¬ned for recognition).
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Prolecanitida
Superfamily:
Medlicottioidea
Family:
Medlicottiidae
Formal Genus Name and Reference:
Medlicottia WAAGEN, 1880, p. 83
Type Species:
Goniatites orbignyanus de VERNEUIL, 1845, p. 378, OD
Images
(Click to enlarge in a new window)
Fig. 128a-q. *M. orbignyana (de Verneuil), Artinskian, a-c, hypotype, PIUB 9 of Haniel (1915, pl. 2, 8 a-c ), Timor, Bitauni, X 1 (new), d-p, ontogenetic succession of sutures, showing ventral prong of lateral lobe \\left ({L}_{1 {v}}\\right) commonly transformed into complexly subdivided first later saddle, Aktubinsk, Kazakhstan d-h, based on first individual, i-m, based on second, n-o, third, p, fourth, d, whorl height at 0.25 mm, e, 0.4 mm, f, 0.5 mm, g, 0.8 mm, h, 1 mm, i, 1.2 mm, j, 1.8 mm, k, 2.5 mm, l, 3.6 mm, m, 5.3 mm, n, 6.7 mm, o, 12 mm, and p, 33.8 mm (Ruzhentsev, 1949a), q, external suture, Aktubinsk, Kazakhstan, SUI 2048, diameter at 35 mm (whorl height estimated about 25 mm or so probably equal to the stage between o and p in Ruzhentsev's sequence (adapted from Miller & Furnish, 1940a).
Synonyms
Paramedlicottia
Geographic Distribution
Devon Island)
Age Range
Beginning Stage in Treatise Usage:
Cisuralian (Sakmarian)
Beginning International Stage:
Sakmarian
Fraction Up In Beginning Stage:
0
Beginning Date:
293.52
Ending Stage in Treatise Usage:
Guadalupian (Wordian)
Ending International Stage:
Wordian
Fraction Up In Ending Stage:
100
Ending Date:
264.34
Description
Conch thinly lenticular, narrow furrowed venter bounded by pair of sharp ventrolateral keels (generally without nodes). Ventrolateral saddle has 8 to 12 subdivisions, remaining saddles rounded or slightly indented near midheight. External lateral lobe and adjacent umbilical lobes in arched alignment, subequal but decreasing in size to umbilicus. Sutural formula: (V2 V1 V2 )v1 v2 v3-6 s1 s1 l7- 5 l4 l3 l2 l1 L1(d) )UU1 U2 ..... [Russian]. Twenty-two named species (most are geographic designations that are too obscurely deļ¬ned for recognition).