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Palaeoscolex

Palaeoscolecida - Cricocosmida - Palaeoscolecidae

Taxonomy
Palaeoscolex was named by Whittard (1953) [Sepkoski's age data: Cm Atda-u O Trem Sepkoski's reference number: 566,783,1105]. Its type is Palaeoscolex piscatorum.

It was assigned to Palaeoscolecida by Sepkoski (2002); to Palaeoscolecidae by Ivantsov and Wrona (2004); and to Nematomorpha by Bambach et al. (2007).

Synonymy list
YearName and author
1953Palaeoscolex Whittard
2002Palaeoscolex Sepkoski, Jr.
2004Palaeoscolex Ivantsov and Wrona p. 6
2007Palaeoscolex Bambach et al.

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Ecdysozoa
RankNameAuthor
classPalaeoscolecidaConway-Morris and Robison 1986
orderCricocosmida
familyPalaeoscolecidaeWhittard 1953
genusPalaeoscolexWhittard 1953

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.

Diagnosis
ReferenceDiagnosis
A. Y. Ivantsov and R. Wrona 2004Long, slender, cylindrical annulated worm without parapodia, covered by paplilate epidermis with cuticle. The papillae (tubercles) are arranged in transverse double rows separated by an intercalation or
furrow accentuating their annular surface pattern. The epidermis may form sclerotized cuticular structures, button-like phosphatic sclerites covering the entire body as an armour. Sclerites may be differentiated in size and ornamentation; the largest are plates, equal in size, circular or sub-circular with prominent nodes on the upper surface, and similar to but smaller than plates are platelets, which can be accompanied by much smaller microplates of simple morphology.