Emuella polymera

Fossil specimen of Emuella polymera（圖片來源：Dave Simpson，採用 CC BY 4.0 授權）

Age

Cambrian（"Stage 3"）

521 Ma

---

Taxonomy

Kingdom: Animalia

Phylum: Arthropoda

Class: Trilobita

Order: Redlichiida

Family: Emuellidae

Genus: Emuella

Species: Emuella polymera

---

Morphological description

Emuella polymera 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 42 segments in the posterior thorax.

---

Etymology

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

polymera: Greek, meaning many, referring to the numerous thoracic segments

---

Biological description

This species is the type species of the genus Emuella and was discovered in Emu Bay on Kangaroo Island, Australia, from which it derives its name.

（Author: Bai Leng）

---

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

---