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Ptyocephalus

Artiopoda - Asaphida - Asaphidae

Taxonomy
Ptychocephalus was named by Agassiz (1843) [Sepkoski's age data: O Trem-u O Aren-l Sepkoski's reference number: 795]. Its type is Ptyocephalus vigilans.

It was misspelled as Ptychocephalus by Sepkoski (2002); it was corrected as Ptyocephalus by Fortey (1975), Jell and Adrain (2002), Peters (2003).

It was assigned to Isotelinae by Fortey (1975); to Asaphida by Sepkoski (2002); and to Asaphidae by Jell and Adrain (2002), Peters (2003).

Synonyms
Synonymy list
YearName and author
1843Ptychocephalus Agassiz p. 178
1942Kirkella Kobayashi
1975Ptyocephalus Fortey
2002Kirkella Jell and Adrain p. 294
2002Ptyocephalus Jell and Adrain p. 436
2002Ptychocephalus Sepkoski
2003Ptyocephalus Peters

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
RankNameAuthor
classArtiopodaHou and Bergstrom
classTrilobitaWalch 1771
subclassLibristoma
orderAsaphidaSalter 1864
superfamilyAsaphoideaSalter 1864
familyAsaphidaeBurmeister 1843
genusPtyocephalus()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

G. †Ptyocephalus Agassiz 1843
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†Kirkella declevita Ross 1951
†Ptyocephalus acclivus Hintze 1953
†Ptyocephalus vigilans Whittington 1948
Invalid names: Kirkella Kobayashi 1942 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Entire body: yesg
Adult length: 10 to < 100g
Adult width: 10 to < 100g
Adult height: 1.0 to < 10g
Spines: noneg
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingo
Life habit: low-level epifaunalo
Diet: carnivorec
Vision: well-developedf
Created: 2009-06-08 12:08:28
Modified: 2009-06-08 14:08:28
Source: g = genus, f = family, o = order, c = class
References: Hendy et al. 2009, Aberhan et al. 2004, Hendy 2009

Age range: base of the Tulean to the top of the Whiterockian or 481.70000 to 457.30000 Ma

Collections (90 total)


Time interval Ma Country or state Original ID and collection number
Ibexian488.9 - 471.3USA (Nevada) Kirkella sp. (226716)
Ibexian488.9 - 471.3Norway (Spitsbergen) P. vigilans (106475)
Early/Lower Ordovician486.85 - 471.3USA (Utah) P. declivita (77844)
Canadian486.85 - 457.3USA (Utah) Kirkella sp. (103891 103918)
Tremadoc486.4 - 477.1Canada (Alberta) P. acclivus (10935) P. declevitus (10900 10903 10904 10906 10909 10910 10911 10913 10917 10919 10921 10923 10924)
Stairsian - Tulean483.4 - 475.3Canada (British Columbia) Kirkella vigilans (50169)
Cassinian483.4 - 471.3USA (Utah) P. declevita (104058)
Tulean481.7 - 475.3USA (Utah) Kirkella fillmorensis (104083 104103 104105 104123)
Tulean481.7 - 475.3USA (Montana) Kirkella fillmorensis (210747) Ptychocephalus sp. (287) P. montanensis (174361 174362 174363)
Tulean - Blackhillsian481.7 - 471.3USA (Nevada) Kirkella vigilans (77186)
Arenig477.1 - 468.0USA (Nevada) Kirkella sp. (60038)
Arenigian477.1 - 468.0USA (Utah) P. sp. (64496 64502)
Blackhillsian475.3 - 471.3Canada (Alberta) P. declevitus (10897 10899)
Blackhillsian475.3 - 471.3USA (Utah) Kirkella accliva (104126 104127 104128 105780) Kirkella declevita (103831 103917) Kirkella declivita (63843 63846 63926 63927 63929) Kirkella sp. (63844 105779) Kirkella versini (104130 104131) Kirkella vigilans (63810 63839 104133) Ptychocephalus sp. (295) P. accliva (69261) P. sp. (104138) P. vigilans (104141)
Blackhillsian475.3 - 471.3USA (California) P. declevita (104636) P. sp. (104306 104349 104637)
Blackhillsian475.3 - 471.3USA (Nevada) Kirkella sp. (77181 77184) P. accliva (104553) P. sp. (104301 104350 104353 104354 104355 104403 104404 104405 104431 104550 104552 104554 104555 104556 104567 104631 104632 104633 104651) P. vigilans (104433 104570 104630)
Blackhillsian475.3 - 471.3Canada (British Columbia) P. declevitus (111537)
Whiterockian471.3 - 457.3USA (Nevada) P. sp. (37478)
Sandbian458.2 - 452.8Russian Federation (Siberia) P. lentiformis (205631)