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Bradoriids (Arthropoda) and the Cambrian Diversification

Department of Geology and Geography, Mount Holyoke College, South Hadley, MA 01075, USA
Geosciences 2020, 10(4), 119; https://doi.org/10.3390/geosciences10040119
Received: 2 March 2020 / Revised: 25 March 2020 / Accepted: 25 March 2020 / Published: 27 March 2020
(This article belongs to the Special Issue 2020: A 10 Years Journey-Advances in Geosciences)
Bradoriids, among the earliest arthropods to appear in the fossil record, are extinct, ostracod-like bivalved forms that ranged from the early Cambrian to the Middle Ordovician. Bradoriids are notable for having appeared in the Cambrian fossil record before the earliest trilobites, and considering their rapid ascent to high genus-level diversity, provide key data for our understanding of the evolutionary dynamics of the Cambrian Explosion. This paper presents a broad review of bradoriid paleobiology. It is hypothesized here that an allele of Antennapedia determines whether bradoriid shields are preplete, amplete, or postplete. The preplete configuration of the shields of Cambroarchilocus tigris gen. nov. sp. nov. suggests that shield rowing motion may have propelled the animal backwards. Arcuate scars attributed here to a microdurophagous predator (Arcuoichnus pierci nov. ichnogen. nov. ichnosp.) occur on the paratype of Cambroarchilocus tigris gen. nov. sp. nov.
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Keywords: Arthropoda; Bradoriida; Cambrian; Chengjiang; Sonora; México; Antennapedia complex; durophagous predation; ichnofossils Arthropoda; Bradoriida; Cambrian; Chengjiang; Sonora; México; Antennapedia complex; durophagous predation; ichnofossils
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McMenamin, M.A.S. Bradoriids (Arthropoda) and the Cambrian Diversification. Geosciences 2020, 10, 119.

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