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Hadrocephalites rhytidodes

Trilobita - Ptychopariida

Taxonomy
Hadrocephalites rhytidodes was named by Sundberg and McCollum (2002). Its type specimen is USNM 509485, a cephalon/head, and it is a 3D body fossil.

Synonymy list
YearName and author
2002Hadrocephalites rhytidodes Sundberg and McCollum pp. 89 - 92 figs. 12.1-12.4

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
Panarthropoda
phylumArthropodaLatreille 1829
subphylumArtiopoda(Hou and Bergstrom)
RankNameAuthor
classTrilobitaWalch 1771
subclassLibristoma
orderPtychopariidaSwinnerton 1915
suborderPtychopariinaRichter 1933
superfamilyPtychopariaceaMatthew 1887
genusHadrocephalites
speciesrhytidodes

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.

Hadrocephalites rhytidodes Sundberg and McCollum 2002
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Diagnosis
ReferenceDiagnosis
F. A. Sundberg and L. B. McCollum 2002Cranidia with rectangular outline (approximately 60 percent width), preglabellar field present (25 to 30 percent cranidial length), straight anterior border in larger specimens, plectrum present, wide fixigena (45 to 60 percent glabellar width), strongly posterolaterally directed ocular ridges, coarse and fine granules. Pygidium subrectangular with 3 to 4 axial rings, large terminal piece not overhanging pygidial border, and longer (exsag.) pleural furrows that extends only a short distance on to relatively narrow-based spines
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: Aberhan et al. 2004, Fortey and Owens 1999

Age range: base of the St Davids to the top of the Delamaran or 509.00000 to 506.50000 Ma

Collections (10 total)


Time interval Ma Country or state Original ID and collection number
Delamaran511.2 - 506.5USA (Nevada) Hadrocephalites rhytidodes (225271)
St Davids509.0 - 497.0USA (Nevada) Hadrocephalites rhytidodes (50094 50095 50100 50114 50293 50326 50330 50331 50338)