Emuella dalgarnoi

Fossil specimen of Emuella dalgarnoi Paterson, J., Edgecombe, G. E. (2006)

Age

Cambrian（"Stage 3"）

521 Ma

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Taxonomy

Kingdom: Animalia

Phylum: Arthropoda

Class: Trilobita

Order: Redlichiida

Family: Emuellidae

Genus: Emuella

Species: Emuella dalgarnoi

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Morphological description

Emuella dalgarnoi has a cephalon that is roughly pentagonal in outline, with a semicircular cranidium and well-developed genal spines. The prothorax consists of six segments, with the sixth segment bearing a distinct pleural spine. The opisthothorax is composed of a very large number of segments; the highest known individuals possess up to 52 segments in the posterior thorax.

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Etymology

Emu Bay: refers to the locality where the fossils were discovered

Dalgarno: a surname

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Biological description

This species represents the second known species within the genus Emuella. It differs from the type species primarily in subtle variations in cephalic morphology.

（Author: Bai Leng）

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References

1. Pocock, K.J. (1970). The Emuellidae, a new family of trilobites from the Lower Cambrian of South Australia. Palaeontology

2. 白水. 三葉蟲圖鑑 V1.1

-35.6, 137.5

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