The taxonomy and classification of proto-mantis shrimp is an ongoing project. There are several groups and they form a paraphyletic series leading to the modern mantis shrimp.
Anatomical detail of Daidal acanthocercus. The top image shows the animal with the front end curved to the right. Both the legs of the pleon (AR) and cephalothorax (Th) are visible. The bottom image shows details of the animal's tailfan, including the protopod of the uropods (P) with its spines (arrows), the outer (Ex) and inner (En) rami of the uropods, and the telson (T). © Contributions to Zoology
The segmented body of the spiny-tailed proto-mantis shrimp is divided into 2 regions:
The cephalothorax includes the:
A carapace or head shield envelops the front part of the cephalothorax.
The hind region of the body - the pleon - is made up of 6 segments. Only fragments of the limbs of the first 5 pleon segments are known, while the 6th segment has a pair of broad, flap-like appendages called uropods.
The uropods, consisting of an inner (endopod) and outer (exopod) branch, flank the telson - the hindmost part of the pleon. Together, the telson and uropods form a tailfan.
There are 2 basic types of proto-mantis shrimp, characterised by either:
The spiny-tailed proto-mantis shrimp is of the first type.
View a slideshow of images showing anatomical details of this proto-mantis shrimp.
Find out which species show similarities to Daidal acanthocercus, and how to distinguish them.
Learn how proto-mantis fossils can shed light on the evolution of the body plan of mantis shrimp and their specialised claws.