A Corset-Like Fossil from the Cambrian Sirius Passet Lagerstätte of North Greenland and Its Implications for Cycloneuralian Evolution

A large (maximum length 80 mm), tubular, corset-like problematic fossil from the early Cambrian (Cambrian Series 2, Stage 3) Sirius Passet Lagerstätte of North Greenland is interpreted as the lorica of an ancestral loriciferan. In addition to the double circlet of 7 plates composing the lorica, Siri...

Full description

Saved in:
Bibliographic Details
Published in:Journal of paleontology 2010-03, Vol.84 (2), p.332-340
Main Author: Peel, John S
Format: Article
Language:English
Subjects:
Arctic region
Buen Formation
Cambrian
Cycloneuralia
Earth sciences
Evolution
Fauna
Fossils
Geology
Geovetenskap
Greenland
Invertebrata
invertebrate
Lagerstatten
Lagerstätte
Larvae
Larval development
Loricifera
Lower Cambrian
morphology
NATURAL SCIENCES
NATURVETENSKAP
new taxa
Northern Greenland
ontogeny
Paleontology
Paleozoic
Peary Land
phylogeny
Problematic fossil
problematic fossils
Shales
Sirilorica carlsbergi
Sirius Passet Lagerstatte
Teeth
Worms
Zoology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A large (maximum length 80 mm), tubular, corset-like problematic fossil from the early Cambrian (Cambrian Series 2, Stage 3) Sirius Passet Lagerstätte of North Greenland is interpreted as the lorica of an ancestral loriciferan. In addition to the double circlet of 7 plates composing the lorica, Sirilorica carlsbergi new genus, new species also preserves up to six multicuspidate cuticular denticles that are similar in shape to the pharyngeal teeth of priapulid worms, although their location is suggestive of scalids. Whilst traditionally placed as a sister group of priapulid worms within Vinctiplicata (Scalidophora), recent molecular sequence data suggest that loriciferans might be more closely related to nematomorphs. The limited morphological information available from Sirilorica is consistent with this interpretation, placing the Sirius Passet fossil within the total-group of Loricifera, within the Loricifera + Nematomorpha clade.
ISSN:0022-3360
1937-2337
1937-2337
DOI:10.1666/09-102R.1