Unusual Juvenile Opabinid Arthropod Fossil from Chengjiang
Leanchoilia illecebrosa

Leanchoilia illecebrosa

Geological Time: Early Cambrian (~525 million years ago)

Size (25.4 mm = 1 inch): 9 mm long on a 60 mm by 27 mm matrix

Fossil Site: Chengjiang Maotianshan Shales - Quiongzhusi Section, Yu’anshan Member, Heilinpu Formation, Mafang Village, Anning, Yunnan Province, China

Fossil Code: CJF036

Price: $375.00


Description: This unusual arthropod is known as Leanchoilia. The taxon is known from a number of locations The diversity of soft-tissue fossils is astonishing: algae, medusiforms, sponges, priapulids, annelid-like worms, echinoderms, arthropods (including trilobites), hemichordates, chordates, and the first agnathan fish make up just a small fraction of the total. Numerous problematic forms are known as well, some of which may have represented failed attempts at diversity that did not persist to the present day. The specimen is a member of the “great appendage arthropods” known as the opabinids after Opabinia from the Burgess Shale Fauna. Other members from Chengjiang are Jianfengia and Alalcomenaeus (see my other offerings for examples). The exceptional detail of the appendages are readily apparent in this fine specimen, and are indicative of the fact that this was a strong swimmer. This is a truly exceptional juvenile specimen, and as such is only about 40% the size of others seen, one that is sure to become a cornerstone of any collection of material from the Cambrian Explosion.

Also see: Chengjiang Biota Fauna List Chengjiang Fossils

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