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Streptograptus
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Streptograptus Yin, 1937, p. 297
Type Species:
*Graptolithus plumosus Baily, 1871, p. 22; SD ICZN, Opinion 1714, 1993, p. 90 (replacement of Monograptus nodifer Törnquist, 1881, sensu Elles & Wood, 1913, pl. 46,2a–d; Yin, 1937, p. 297; proposed to ICZN by Loydell & Chen, 1991
Images
(Click to enlarge in a new window)
Fig. 297,1a–b. *S. plumosus (Baily); 1a, neotype, BELUM K12274d, Tieveshilly, County Down, Northern Ireland, scale bar, 1 mm (Loydell, 1990b, fig. 1); 1b, larger specimen showing tubarium shape, MGM6646-0, El Pintado reservoir, Seville Province, Spain, scale bar, 1 mm (Loydell, Frýda, & Gutiérrez-Marco, 2015, fig. 21AQ).—— Fig. 297,1c–d. S. nodifer (Törnquist), neotype (Zalasiewicz & Howe, 2003, p. 46), proximal end and distal thecal style, LO 6465t, Nitsjö, Dalarna, Sweden (Zalasiewicz & Howe, 2003, fig. 1). Scale bars, 1 mm.——Fig. 297,1e–f. S. wimani (Bouček, 1932); 1e, lectotype (Bouček & Přibyl in Přibyl, 1948a, p. 38), Vyskočilka, Czech Republic (Bouček, 1932, fig. 1i); 1f, proximal end showing sicula, MGM 142-S, Jabalón River section, central Spain (Loydell & others, 2009, fig. 4F). Scale bars, 1 mm.
Synonyms
Globosograptus, Awarograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Pribylograptus leptotheca Biozone))
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian, Wenlock (Homerian, Cyrtograptus lundgreni Biozone)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
0
Ending Date:
426.74
Description
Tubarium straight, dorsally, ventrally or dorso-ventrally curved; sicula small; first theca originated via a lenticular porus; metathecae coiled; thecal apertures with central, proximo-ventrally directed nozzle, in some taxa developed only in the apron.
References
Museum or Author Information
Classification
Phylum:
Hemichordata
Class:
Pterobranchia
Order:
Graptoloidea
Superfamily:
Neograptina
Family:
Monograptidae
Formal Genus Name and Reference:
Streptograptus Yin, 1937, p. 297
Type Species:
*Graptolithus plumosus Baily, 1871, p. 22; SD ICZN, Opinion 1714, 1993, p. 90 (replacement of Monograptus nodifer Törnquist, 1881, sensu Elles & Wood, 1913, pl. 46,2a–d; Yin, 1937, p. 297; proposed to ICZN by Loydell & Chen, 1991
Images
(Click to enlarge in a new window)
Fig. 297,1a–b. *S. plumosus (Baily); 1a, neotype, BELUM K12274d, Tieveshilly, County Down, Northern Ireland, scale bar, 1 mm (Loydell, 1990b, fig. 1); 1b, larger specimen showing tubarium shape, MGM6646-0, El Pintado reservoir, Seville Province, Spain, scale bar, 1 mm (Loydell, Frýda, & Gutiérrez-Marco, 2015, fig. 21AQ).—— Fig. 297,1c–d. S. nodifer (Törnquist), neotype (Zalasiewicz & Howe, 2003, p. 46), proximal end and distal thecal style, LO 6465t, Nitsjö, Dalarna, Sweden (Zalasiewicz & Howe, 2003, fig. 1). Scale bars, 1 mm.——Fig. 297,1e–f. S. wimani (Bouček, 1932); 1e, lectotype (Bouček & Přibyl in Přibyl, 1948a, p. 38), Vyskočilka, Czech Republic (Bouček, 1932, fig. 1i); 1f, proximal end showing sicula, MGM 142-S, Jabalón River section, central Spain (Loydell & others, 2009, fig. 4F). Scale bars, 1 mm.
Synonyms
Globosograptus, Awarograptus
Geographic Distribution
worldwide
Age Range
Beginning Stage in Treatise Usage:
Silurian, Llandovery (Aeronian, Pribylograptus leptotheca Biozone))
Beginning International Stage:
Aeronian
Fraction Up In Beginning Stage:
0
Beginning Date:
440.49
Ending Stage in Treatise Usage:
Silurian, Wenlock (Homerian, Cyrtograptus lundgreni Biozone)
Ending International Stage:
Homerian
Fraction Up In Ending Stage:
0
Ending Date:
426.74
Description
Tubarium straight, dorsally, ventrally or dorso-ventrally curved; sicula small; first theca originated via a lenticular porus; metathecae coiled; thecal apertures with central, proximo-ventrally directed nozzle, in some taxa developed only in the apron.