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Demirastrites
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Demirastrites EISEL, 1912, p. 27
Type Species:
* Rastrites triangulatus Harkness, 1851, p. 59, SD BULMAN, 1929, p. 175
Images
(Click to enlarge in a new window)
Fig. 300,3a-c. *D. triangulatus (Harkness), 3a, lectotype (Přibyl & Münch, 1941, p. 5), strongly distorted specimen, BGS 6941, Birkhill Shales, Frenchland Burn, Scotland (Zalasiewicz, 2008e, Atlas, Folio 2.92), 3b, specimen missing proximal end, PŠ 3517, Všeradice, Czech Republic (Štorch, 2015, fig. 17f), 3c, proximal end, PŠ 3643, Všeradice, Czech Republic (Štorch, 2015, fig. 17m). Scale bars, 1 mm
Synonyms
Geographic Distribution
world-wide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Demirastrites triangulatus Biozone)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Demirastrites pectinatus Biozone)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
0
Ending Date:
438.59
Description
Tubarium with proximally accentuated dorsal curvature, sicula small, apex reaching to about level of first metatheca at maximum, metathecae isolated, inclined at high angle to the tubarium axis, thecal apertural hoods or hooks may be extended transversely into a pair of lateral horns, mesial and distal thecae are more or less high-triangular in profile, first theca rastritid or triangular, axially elongated, up to several succeeding proximal thecae may have very slender elongated prothecae, slightly widening toward the base of widely separated, parallel-sided rastritiform metathecae
References
Eisel, Robert. 1912. Über zonenweise Entwicklung der Rastriten und Demirastriten. 53./54. Jahresbericht der Gesellschaft von Freunden der Naturwissenschaften, Gera, p. 27-43, 3 pl .
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Demirastrites EISEL, 1912, p. 27
Type Species:
* Rastrites triangulatus Harkness, 1851, p. 59, SD BULMAN, 1929, p. 175
Images
(Click to enlarge in a new window)
Fig. 300,3a-c. *D. triangulatus (Harkness), 3a, lectotype (Přibyl & Münch, 1941, p. 5), strongly distorted specimen, BGS 6941, Birkhill Shales, Frenchland Burn, Scotland (Zalasiewicz, 2008e, Atlas, Folio 2.92), 3b, specimen missing proximal end, PŠ 3517, Všeradice, Czech Republic (Štorch, 2015, fig. 17f), 3c, proximal end, PŠ 3643, Všeradice, Czech Republic (Štorch, 2015, fig. 17m). Scale bars, 1 mm
Synonyms
Geographic Distribution
world-wide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Demirastrites triangulatus Biozone)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Demirastrites pectinatus Biozone)
Ending International Stage:
Aeronian
Fraction Up In Ending Stage:
0
Ending Date:
438.59
Description
Tubarium with proximally accentuated dorsal curvature, sicula small, apex reaching to about level of first metatheca at maximum, metathecae isolated, inclined at high angle to the tubarium axis, thecal apertural hoods or hooks may be extended transversely into a pair of lateral horns, mesial and distal thecae are more or less high-triangular in profile, first theca rastritid or triangular, axially elongated, up to several succeeding proximal thecae may have very slender elongated prothecae, slightly widening toward the base of widely separated, parallel-sided rastritiform metathecae
References
Eisel, Robert. 1912. Über zonenweise Entwicklung der Rastriten und Demirastriten. 53./54. Jahresbericht der Gesellschaft von Freunden der Naturwissenschaften, Gera, p. 27-43, 3 pl .