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Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

Published on: March 17, 2014

A palaeontological solution to the arthropod head problem.

Graham E Budd¹

¹Department of Earth Sciences (Historical Geology and Palaeontology), Uppsala University, Norbyvägen 22, Uppsala, Sweden. graham.budd@pal.uu.se

|May 17, 2002

Summary

Fossil arthropods from the Cambrian period reveal insights into the evolution of the arthropod head. These ancient creatures possess unique appendages that help clarify relationships between major arthropod groups.

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Area of Science:

Zoology
Paleontology
Evolutionary Biology

Background:

The arthropod head's composition remains a long-standing debate in zoology.
Previous theories have been hindered by a lack of consensus on fossil arthropod systematics.

Purpose of the Study:

To resolve the controversial topic of arthropod head composition using Cambrian fossil evidence.
To establish the phylogenetic position of problematic Cambrian arthropods.

Main Methods:

Systematic analysis of Cambrian arthropods from the Burgess Shale and Chengjiang faunas.
Comparative morphology with extant arthropod groups (myriapods, chelicerates, insects, crustaceans) and onychophorans.
Reconstruction of the crown-group euarthropod ground plan.

Main Results:

A clade of Cambrian arthropods, previously considered problematic, is identified close to crown-group euarthropods.
These fossils exhibit modified or absent endopods and two pre-oral appendages.
The two pre-oral appendages are identified as the first antenna and a reduced ocular segment appendage, likely a precursor to the labrum.

Conclusions:

These Cambrian fossils bridge the evolutionary gap between onychophorans and euarthropods.
The findings clarify the homology of appendages in arthropod evolution.
The study provides a new framework for understanding arthropod head segmentation.