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Pseudoplegmatograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Retiolitidae
Formal Genus Name and Reference:
Pseudoplegmatograptus PŘIBYL, 1948a, p. 22
Type Species:
*Retiolites perlatus obesus LAPWORTH, 1877, p. 137, OD
Images
(Click to enlarge in a new window)
Fig. 278,1a-d. * P. obesus (Lapworth), 1a-b, holotype, BU 1363, 1 a, whole specimen, 1 b, enlarged portion of specimen showing single curved thecal spines, some showing secondary to tertiary branching, Llandovery, lower Telychian, Spirograptus turriculatus Biozone, County Down, Ireland (Elles & Wood, 1908, pl. 34, 12b), 1 c, NMW 91.52G, immature specimen with stoma (arrow) and shallow ancora umbrella made of few meshes, lower Telychian, Spirograptus turriculatus Biozone, Osmundsberget, Sweden (Bates & Kirk, 1992, fig. 180), 1d, GSC 78423, mature specimen without ancora umbrella, Llandovery, lower Telychian, Spirograptus turriculatus Biozone, Arctic Canada (Lenz & Melchin, 1987, pl. 1, 1). Scale bars, 1 mm.
Synonyms
Sinostomatograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Stimulograptus sedgwickii Biozone)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Wenlock (Sheinwoodian, Monograptus riccartonensis Biozone)
Ending International Stage:
Sheinwoodian
Fraction Up In Ending Stage:
0
Ending Date:
430.62
Description
Tubarium widening distally, ancora umbrella with polygonal meshes, nema with connecting lists, no virga, thecal orifices with paired apertural spines, ventral sides defined by thecal lips and pleural lists, reticular lists on ancora sleeve irregular, narrow, but deep external common canal with large stomata, inner and outer reticula of ancora sleeve present, ancora sleeve lists with seams facing outward, bandages finely striated
References
Přibyl, Alois. 1948a. Bibliographic Index of Bohemian Silurian graptolites. Knihovna Státního geologického ústavu Republiky Československé 22:1-97.
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Retiolitidae
Formal Genus Name and Reference:
Pseudoplegmatograptus PŘIBYL, 1948a, p. 22
Type Species:
*Retiolites perlatus obesus LAPWORTH, 1877, p. 137, OD
Images
(Click to enlarge in a new window)
Fig. 278,1a-d. * P. obesus (Lapworth), 1a-b, holotype, BU 1363, 1 a, whole specimen, 1 b, enlarged portion of specimen showing single curved thecal spines, some showing secondary to tertiary branching, Llandovery, lower Telychian, Spirograptus turriculatus Biozone, County Down, Ireland (Elles & Wood, 1908, pl. 34, 12b), 1 c, NMW 91.52G, immature specimen with stoma (arrow) and shallow ancora umbrella made of few meshes, lower Telychian, Spirograptus turriculatus Biozone, Osmundsberget, Sweden (Bates & Kirk, 1992, fig. 180), 1d, GSC 78423, mature specimen without ancora umbrella, Llandovery, lower Telychian, Spirograptus turriculatus Biozone, Arctic Canada (Lenz & Melchin, 1987, pl. 1, 1). Scale bars, 1 mm.
Synonyms
Sinostomatograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Stimulograptus sedgwickii Biozone)
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Wenlock (Sheinwoodian, Monograptus riccartonensis Biozone)
Ending International Stage:
Sheinwoodian
Fraction Up In Ending Stage:
0
Ending Date:
430.62
Description
Tubarium widening distally, ancora umbrella with polygonal meshes, nema with connecting lists, no virga, thecal orifices with paired apertural spines, ventral sides defined by thecal lips and pleural lists, reticular lists on ancora sleeve irregular, narrow, but deep external common canal with large stomata, inner and outer reticula of ancora sleeve present, ancora sleeve lists with seams facing outward, bandages finely striated
References
Přibyl, Alois. 1948a. Bibliographic Index of Bohemian Silurian graptolites. Knihovna Státního geologického ústavu Republiky Československé 22:1-97.