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

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Published on: March 16, 2014

A eucrustacean metanauplius from the Lower Cambrian.

Xi-guang Zhang¹, Andreas Maas, Joachim T Haug

¹Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China. xgzhang@ynu.edu.cn

Current Biology : CB

|May 25, 2010

Summary

This summary is machine-generated.

The oldest known fossil of an immature crustacean larva, Wujicaris muelleri, reveals striking morphological similarities to modern barnacles and copepods. This finding suggests remarkable evolutionary stasis in small eucrustaceans over 525 million years.

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Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

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Published on: February 28, 2017

Area of Science:

Paleontology
Evolutionary Biology
Marine Biology

Background:

The fossil record of early crustacean larval stages is sparse.
Understanding early metanauplius morphology provides insights into crustacean evolution.

Purpose of the Study:

To describe a new genus and species of early metanauplius, Wujicaris muelleri gen. et sp. nov.
To analyze the morphological and evolutionary implications of this ancient larva.

Main Methods:

Fossil discovery and morphological analysis of Wujicaris muelleri.
Comparative morphology with extant barnacle and copepod larvae.

Main Results:

Wujicaris muelleri represents the oldest known fossil of an early crustacean larva.
Its morphology closely resembles modern barnacle and copepod larvae, suggesting similar functions for feeding and locomotion.
The larva exhibits remarkable evolutionary stasis over 525 million years.

Conclusions:

The morphology of Wujicaris muelleri indicates a long-lasting physical niche and environmental regime for small eucrustaceans.
This suggests significant evolutionary stasis in morphology, life history, and lifestyle for these organisms.
Adaptation to low Reynolds numbers and laminar flow may explain this stasis.