Bradoriids (Arthropoda) and the Cambrian Diversification
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 t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-03-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/10/4/119 |
| _version_ | 1797626591874908160 |
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| author | Mark A. S. McMenamin |
| author_facet | Mark A. S. McMenamin |
| author_sort | Mark A. S. McMenamin |
| collection | DOAJ |
| description | 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 <i>Antennapedia</i> determines whether bradoriid shields are preplete, amplete, or postplete. The preplete configuration of the shields of <i>Cambroarchilocus tigris</i> gen. nov. sp. nov. suggests that shield rowing motion may have propelled the animal backwards. Arcuate scars attributed here to a microdurophagous predator (<i>Arcuoichnus pierci</i> nov. ichnogen. nov. ichnosp.) occur on the paratype of <i>Cambroarchilocus tigris</i> gen. nov. sp. nov. |
| first_indexed | 2024-03-11T10:12:36Z |
| format | Article |
| id | doaj.art-3d2a858b07f047e6beaf65054b77e554 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-11T10:12:36Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-3d2a858b07f047e6beaf65054b77e5542023-11-16T14:25:26ZengMDPI AGGeosciences2076-32632020-03-0110411910.3390/geosciences10040119Bradoriids (Arthropoda) and the Cambrian DiversificationMark A. S. McMenamin0Department of Geology and Geography, Mount Holyoke College, South Hadley, MA 01075, USABradoriids, 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 <i>Antennapedia</i> determines whether bradoriid shields are preplete, amplete, or postplete. The preplete configuration of the shields of <i>Cambroarchilocus tigris</i> gen. nov. sp. nov. suggests that shield rowing motion may have propelled the animal backwards. Arcuate scars attributed here to a microdurophagous predator (<i>Arcuoichnus pierci</i> nov. ichnogen. nov. ichnosp.) occur on the paratype of <i>Cambroarchilocus tigris</i> gen. nov. sp. nov.https://www.mdpi.com/2076-3263/10/4/119ArthropodaBradoriidaCambrianChengjiangSonoraMéxico |
| spellingShingle | Mark A. S. McMenamin Bradoriids (Arthropoda) and the Cambrian Diversification Geosciences Arthropoda Bradoriida Cambrian Chengjiang Sonora México |
| title | Bradoriids (Arthropoda) and the Cambrian Diversification |
| title_full | Bradoriids (Arthropoda) and the Cambrian Diversification |
| title_fullStr | Bradoriids (Arthropoda) and the Cambrian Diversification |
| title_full_unstemmed | Bradoriids (Arthropoda) and the Cambrian Diversification |
| title_short | Bradoriids (Arthropoda) and the Cambrian Diversification |
| title_sort | bradoriids arthropoda and the cambrian diversification |
| topic | Arthropoda Bradoriida Cambrian Chengjiang Sonora México |
| url | https://www.mdpi.com/2076-3263/10/4/119 |
| work_keys_str_mv | AT markasmcmenamin bradoriidsarthropodaandthecambriandiversification |