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Acastocephala

Artiopoda - Phacopida - Acastidae

Taxonomy
Acastocephala was named by Shergold (1966).

It was assigned to Acastavinae by Shergold (1966); and to Acastidae by Jell and Adrain (2002).

Species
A. macrops
Species lacking formal opinion data
A. dudleyensis

Synonymy list
YearName and author
1966Acastocephala Shergold pp. 199 - 200
2002Acastocephala Jell and Adrain p. 336

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
classArtiopodaHou and Bergstrom
RankNameAuthor
classTrilobitaWalch 1771
orderPhacopidaSalter 1864
suborderPhacopinaStruve 1959
superfamilyAcastoidea
familyAcastidaeDelo 1935
subfamilyAcastavinaeStruve 1958
genusAcastocephala

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. †Acastocephala Shergold 1966
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†Acastocephala macrops Salter 1864
Diagnosis
ReferenceDiagnosis
J. Shergold 1966Cephalon typically acastid in construction but with larger eye; visual surface
containing, at maximum height, rows of 10 lenses in A. macrops (Salter), 9 in A. dudleyensis
sp. nov. Pygidium wide, weakly furrowed; 4-5 pleural segments; 7 axial segments.During ontogeny of both known species smallest holaspides have a denticulate lateral pygidial margin; denticulations resorbed in succeeding growth stages to give adult with typically entire margin.
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: carnivoresubo
Vision: well-developedf
Created: 2009-12-15 22:42:55
Modified: 2009-12-16 00:42:55
Source: f = family, subo = suborder, c = class
References: Fortey and Owens 1999, Aberhan et al. 2004, Whittington et al. 1997

Age range: Sheinwoodian or 432.90000 to 430.60000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Sheinwoodian432.9 - 430.6United Kingdom (England) A. macrops (192893)
Sheinwoodian - Homerian432.9 - 426.7United Kingdom (England) A. macrops (207977)
Wenlock432.9 - 426.7United Kingdom (England) A. dudleyensis (79893)