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Hadrocephalites

Artiopoda - Ptychopariida

Taxonomy
Hadrocephalites was named by Sundberg and McCollum (2002). Its type is Hadrocephalites lyndonensis.

It was assigned to Ptychopariacea by Sundberg and McCollum (2002); and to Ptychopariidae by Jell and Adrain (2002).

Species
H. carina, H. cecinna, H. convexus, H. lyndonensis (type species), H. rhytidodes, Schistometopus
Sister genera
Schistometopus
Entered
by S. Nurnberg (authorized by M. Aberhan) on 2009-10-03; modified by J. Marcot on 2022-08-17

Synonyms
Synonymy list
YearName and author
1938Schistometopus Resser p. 10
1979Schistometopus Palmer and Halley p. 115
2002Hadrocephalites Jell and Adrain p. 381
2002Schistometopus Jell and Adrain p. 442
2002Schistometopus Sepkoski
2002Hadrocephalites Sundberg and McCollum pp. 86 - 87

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
RankNameAuthor
classArtiopodaHou and Bergstrom
classTrilobitaWalch 1771
subclassLibristoma
orderPtychopariidaSwinnerton 1915
suborderPtychopariinaRichter 1933
superfamilyPtychopariaceaMatthew 1887
genusHadrocephalites

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. †Hadrocephalites Sundberg and McCollum 2002
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†Hadrocephalites carina Walcott 1917
†Hadrocephalites cecinna Walcott 1917
†Hadrocephalites convexus Rasetti 1951
†Hadrocephalites lyndonensis Sundberg and McCollum 2002
†Hadrocephalites rhytidodes Sundberg and McCollum 2002
Invalid names: Schistometopus Resser 1938 [nomen dubium]
Diagnosis
ReferenceDiagnosis
F. A. Sundberg and L. B. McCollum 2002Cranidium with glabella elongated, strongly con vex, and deep axial furrows; preglabellar field short or absent; and anterior border straight or slightly curved. Pygidium trans versely elongate, subrectangular, posterior border nearly straight, wide; long, relatively narrow-based pygidial spines; wide posterior border; strong pleural bands, postaxial notch absent.
Measurements
No measurements are available
Composition: low Mg calcitec
Composition 2: chitinc
Ontogeny: molting, addition of partsc
Environment: marinec
Locomotion: fast-movingc
Life habit: low-level epifaunalc
Diet: deposit feedersubo
Created: 2012-08-27 22:20:36
Modified: 2012-08-27 07:20:36
Source: subo = suborder, c = class
References: Fortey and Owens 1999, Aberhan et al. 2004

Age range: base of the Middle Cambrian to the top of the Delamaran or 506.50000 to 505.30000 Ma

Collections (32 total)


Time interval Ma Country or state Original ID and collection number
Cambrian538.8 - 486.85Argentina (San Juan) H. sp. (200106)
Delamaran509.7 - 505.3Canada (Alberta) Crepicephalus cecinna (225265)
Delamaran509.7 - 505.3USA (Nevada) H. rhytidodes (225271) Schistometopus sp. (149562)
Delamaran509.7 - 505.3USA (California) Schistometopus sp. (149617)
Delamaran509.7 - 505.3Canada (British Columbia) Crepicephalus cecinna (225278) Schistometopus convexus (225263 225264)
Solvan508.2 - 504.5Canada (British Columbia) Schistometopus convexus (56704 56717 56718 56720) Schistometopus minor, Schistometopus convexus (56703 56721)
Middle Cambrian506.5 - 497.0USA (Idaho) Schistometopus typicalis (127485)
St Davids506.5 - 497.0USA (Nevada) H. lyndonensis (50097 50301 50327) H. rhytidodes (50095 50100 50114 50293 50326 50330 50331 50338) H. rhytidodes, H. lyndonensis (50094) H. sp. (50115 50336) H. sp. B (50098 50101 50323)