Moulting arthropod caught in the act

  title={Moulting arthropod caught in the act},
  author={Diego C. García‐Bellido and Desmond Collins},
A Cambrian fossil confirms that early arthropods shed their coats just as they do today. 

The First Discovery of Marrella (Arthropoda, Marrellomorpha) from the Balang Formation (Cambrian Series 2) in Hunan, China

  • Qing Liu
  • Geography
    Journal of Paleontology
  • 2013
Abstract Marrella, a well-known and important component of the Burgess Shale, was only previously found in the Burgess Shale and in the Kaili Biota. An exoskeleton attributed to Marrella is described

Demecology in the Cambrian: synchronized molting in arthropods from the Burgess Shale

Evidence for mass molting events in two unrelated arthropods from the Burgess Shale Walcott Quarry, Canadaspis perfecta and a megacheiran referred to as Alalcomenaeus sp.

Ecdysis in a stem-group euarthropod from the early Cambrian of China

This fossil is interpreted as a discarded exoskeleton overlying the carcass of an emerging individual of Alacaris mirabilis, which offers the stratigraphically and phylogenetically earliest direct evidence of ecdysis within total-group Euarthropoda, and represents one of the oldest examples of this growth strategy in the evolution of Ecdysozoa.


Rare specimens in which two plates are conjoined, with a larger plate underlying a smaller one, are interpreted as showing a new sclerite emerging underneath its predecessor, which has not yet been moulted, and contribute to a fuller understanding of the ontogeny of these organisms.

The fossil record of ecdysis, and trends in the moulting behaviour of trilobites.

A new study of Marrella splendens (Arthropoda, Marrellomorpha) from the Middle Cambrian Burgess Shale, British Columbia, Canada

Study of over 1000 specimens of Marrella splendens Walcott, 1912, out of the more than 9000 collected by the Royal Ontario Museum (ROM) since 1975, has produced new information on the anatomy,

The bivalved arthropods Isoxys and Tuzoia with soft‐part preservation from the Lower Cambrian Emu Bay Shale Lagerstätte (Kangaroo Island, Australia)

Abstract:  Abundant material from a new quarry excavated in the lower Cambrian Emu Bay Shale (Kangaroo Island, South Australia) and, particularly, the preservation of soft‐bodied features previously

Recognising moulting behaviour in trilobites by examining morphology, development and preservation: Comment on Błażejowski et al. 2015

It is argued that this rich source of data has been underused in evolutionary studies, though has great potential for investigating the life history and evolution of arthropods in deep time.

Morphology and systematics of the anomalocaridid arthropod Hurdia from the Middle Cambrian of British Columbia and Utah

In Cambrian fossil Lagerstätten like the Burgess Shale, exceptionally preserved arthropods constitute a large part of the taxonomic diversity, providing opportunities to study the early evolution of



The significance of moulting in Ecdysozoan evolution

The evolution of planktotrophic larvae may have been independently achieved at least three times within Bilateria, and the nonmoulting clades evolved larvae that swim and feed via ciliated tufts and bands, presumably intercalating these forms within their early developmental systems.

Ecydsial efficiency and evolutionary efficacy among marine arthropods: implications for trilobite survivorship

The cumulative effects of a less-than-optimal ecdysial habit, and a physiology that apparently required reconstituting a calcitic exoskeleton de novo with each moult, are compelling biotic factors to consider in examining functional interpretations, life histories, evolutionary trends, and ultimate disposition of the Trilobita.

Proposing a solution to the Articulata–Ecdysozoa controversy

Morphological, palaeontological and molecular implications of this theory suggest that segmentation has been lost in phyla such as Nematoda and Priapula, but the Kinorhyncha may show a ‘reduced segmentation’ with serially arranged muscles associated with a ringed cuticle.

Relationships of Cambrian Arachnata and the systematic position of Trilobita

Reweighted characters favor Trilobita and Helmetiida as closest relatives, with Petalopleura and then Naraoiidae as sister groups.

Evidence for a clade of nematodes, arthropods and other moulting animals

The results suggest that ecdysis (moulting) arose once and support the idea of a new clade, Ecdysozoa, containing moulting animals: arthropods, tardigrades, onychophorans, nematodes, Nematomorphs, kinor-hynchs and priapulids.

Cockroach molting. I. Temporal organization of events during molting cycle of Blattella germanica (L.).

It is proposed that limb regeneration feeds back to delay molting by delaying brain hormone secretion.

Diel timing of molting and metamorphosis of Panulirus japonicus phyllosoma larvae under laboratory conditions

The start of lighting had a greater impact on the timing of molting than the end of lighting, suggesting that sunrise is probably the critical signal for phase-setting in molting rhythm.