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Agnostus
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Agnostus BRONGNIART, 1822, p. 38
Type Species:
Entomostracites pisiformis Wahlenberg, 1818, p. 42, SD Jaekel, 1909, p. 399, lectotype cephalon (WAHLENBERG, 1818, pl. 1, fig. 5, SD Shergold, Laurie, & SUN, 1990, p. 32), Vg819a, PM, Uppsala
Images
(Click to enlarge in a new window)
Fig. 217, 1a,b. *A. (A.) pisiformis (Wahlenberg), Upper Cambrian (A. pisiformis Zone), Sweden (Hönsäter, Hallevad-Billingen, Västergötland), a, lectotype, cephalon, PM Vg819a, x7.55 (new), b, paralectotype, pygidium, PM Vg819b, X6.95 (new).", "——Fig. 217,2a,b. *A. (H.) obesus (Belt), Upper Cambrian (Olenus Zone), a, lectotype, northern Wales (Afon Mawddach, Dolmelynllyn), X8 (Allen, Jackson, & Rushton, 1981, pl. 16, fig. 2), b, exoskeleton, BMNH TE6, England (Nuneaton district), x6.67 (Rushton, 1978, pl. 25, fig. 4)."
Synonyms
Geographic Distribution
Cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
upper Middle Cambrian
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
512.3
Description
Generally with relatively narrow borders, Cephalon with median preglabellar furrow, anterior glabellar lobe ogival or rounded, posterior lobe tapering forward, axial node level with or slightly behind variably developed F2, basal lobes variable in size, Pygidium with long (sag.), variably wide (tr.), and tumid axis, usually not reaching border furrow, lacking median postaxial furrow, marginal spines present
References
Brongniart, A. 1822. Les Trilobites. In A. Brongniart
Museum or Author Information
Classification
Phylum:
Unknown
Class:
Trilobata
Order:
Agnostida
Superfamily:
Agnostoidea
Family:
Agnostidae
Formal Genus Name and Reference:
Agnostus BRONGNIART, 1822, p. 38
Type Species:
Entomostracites pisiformis Wahlenberg, 1818, p. 42, SD Jaekel, 1909, p. 399, lectotype cephalon (WAHLENBERG, 1818, pl. 1, fig. 5, SD Shergold, Laurie, & SUN, 1990, p. 32), Vg819a, PM, Uppsala
Images
(Click to enlarge in a new window)
Fig. 217, 1a,b. *A. (A.) pisiformis (Wahlenberg), Upper Cambrian (A. pisiformis Zone), Sweden (Hönsäter, Hallevad-Billingen, Västergötland), a, lectotype, cephalon, PM Vg819a, x7.55 (new), b, paralectotype, pygidium, PM Vg819b, X6.95 (new).", "——Fig. 217,2a,b. *A. (H.) obesus (Belt), Upper Cambrian (Olenus Zone), a, lectotype, northern Wales (Afon Mawddach, Dolmelynllyn), X8 (Allen, Jackson, & Rushton, 1981, pl. 16, fig. 2), b, exoskeleton, BMNH TE6, England (Nuneaton district), x6.67 (Rushton, 1978, pl. 25, fig. 4)."
Synonyms
Geographic Distribution
Cosmopolitan
Age Range
Beginning Stage in Treatise Usage:
upper Middle Cambrian
Beginning International Stage:
Drumian
Fraction Up In Beginning Stage:
0
Beginning Date:
504.5
Ending Stage in Treatise Usage:
lower Upper Cambrian
Ending International Stage:
Cambrian Stage 4
Fraction Up In Ending Stage:
0
Ending Date:
512.3
Description
Generally with relatively narrow borders, Cephalon with median preglabellar furrow, anterior glabellar lobe ogival or rounded, posterior lobe tapering forward, axial node level with or slightly behind variably developed F2, basal lobes variable in size, Pygidium with long (sag.), variably wide (tr.), and tumid axis, usually not reaching border furrow, lacking median postaxial furrow, marginal spines present
References
Brongniart, A. 1822. Les Trilobites. In A. Brongniart