Name: Onychodictyon
ferox
Phylum
Lobopodia
Geological
Time: Early Cambrian (~525 million years ago)
Size: Onychodictyon:
47 mm long on a 60 mm by 53 mm matrix
Fossil
Site: Chengjiang Maotianshan Shales, Quiongzhusi Section, Yu’anshan
Member, Heilinpu Formation Mafang, Anning, Yunnan Province, China
The
Lobopodians are small marine and terrestrial animals termed colloquially
“velvet worms” or “worms with legs”. While
all recent forms are terrestrial, most Lobopodians in the fossil
record were marine creatures. Most fossils are from the Cambrian,
before life moved ashore. Six named genera, each with a single species,
are known from the Chengjiang Biota, making it Onychodictyon ferox
artthe richest source of Lobopodian fossils.
Onychodictyon ferox is one of the most striking,
and quite rare; as of 2004, only some 15 examples were known. The
maximum length is 70 mm. It possesses a sclerotized head shield
with 10 paired sclerotic plates, each associated with a pair of
legs. Each leg has curved claws that are thought to have served
the creature as an adaptation to crawling on other organisms. Onychodictyon
ferox is most closely related to Aysheaia from the younger Burgess
Shale fauna.
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