Mainbrookia Adrain & Pérez-Peris 2021, n. gen.
Creators
Description
Mainbrookia n. gen.
Type species. Mainbrookia becki n. sp., from the Table Cove Formation (Darriwilian), western Newfoundland, Canada (Laurentia).
Other species. Sphaerocoryphe akimbo Tripp, 1967, Stinchar Limestone Formation (Darriwilian), South Ayrshire, Scotland (Laurentian-affinity Midland Valley Terrane); Sphaerocoryphe saba Tripp, 1962, Confinis Formation (Darriwilian), South Ayrshire, Scotland (Laurentian-affinity Midland Valley Terrane). In addition, provisionally assigned are remaining poorly known Laurentian-affinity forms from the Darriwilian. From the Confinis Formation (Darriwilian), South Ayrshire, Scotland (Laurentian-affinity Midland Valley Terrane): Sphaerocoryphe sp. A of Tripp (1962, p. 21), Sphaerocoryphe sp. B of Tripp (1962, p. 22), Sphaerocoryphe sp. C of Tripp (1962, p. 22). From the Stinchar Limestone Formation (Darriwilian), South Ayrshire, Scotland (Laurentian-affinity Midland Valley Terrane): Sphaerocoryphe sp. A of Tripp (1967, p. 66), Sphaerocoryphe sp. B of Tripp (1967, p. 66), Sphaerocoryphe sp. of Tripp (1979, p. 350).
Etymology. After the town of Main Brook, which is near to the locality from which the type species was collected. Gender is feminine.
Diagnosis. Cranidial fixigenal lateral border spine present; pygidium with three axial rings and three pairs of spines, first pair large, elongate, and dorsally produced.
Discussion. The assigned Scottish species are somewhat difficult to fully interpret, as they are all based on coarsely preserved internal mold material illustrated with very small photographs. Nevertheless, M. akimbo has a pygidium with essentially the same morphology as that of M. becki (Tripp, 1967, pl. 4, figs 8, 9) and it definitely has a fixigenal lateral border spine (Tripp, 1967, pl. 4, fig. 4). Mainbrookia saba is not known from the pygidium, but definitely has a fixigenal lateral border spine (Tripp, 1962, pl. 3, fig. 11). The remaining open nomenclature Darriwilian Scottish species are largely scraps that lack evidence of diagnostic features. We assign them provisionally to Mainbrookia, but obviously this should be revisited if more information becomes available.
Notes
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Linked records
Additional details
Related works
- Is part of
- Journal article: 10.11646/zootaxa.5041.1.1 (DOI)
- Journal article: http://zenodo.org/record/5531880 (URL)
- Journal article: http://publication.plazi.org/id/2543FFACFF8C6C40F9513A281D2AFFEB (URL)
- Journal article: http://zoobank.org/5E82BE60-609F-4287-AC67-D86536FB7686 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/D97A87D4FF816C4DF9C6394E199DF956 (URL)
Biodiversity
- Family
- Cheiruridae
- Genus
- Mainbrookia
- Kingdom
- Animalia
- Order
- Phacopida
- Phylum
- Arthropoda
- Scientific name authorship
- Adrain & Pérez-Peris
- Taxonomic status
- gen. nov.
- Taxon rank
- genus
- Type status
- holotype
- Taxonomic concept label
- Mainbrookia Adrain & Pérez-Peris, 2021
References
- Tripp, R. P. (1967) Trilobites from the upper Stinchar Limestone (Ordovician) of the Girvan District, Ayrshire. Transactions of the Royal Society of Edinburgh, 67, 43 - 94. https: // doi. org / 10.1017 / S 0080456800023899
- Tripp, R. P. (1962) Trilobites from the " confinis " Flags (Ordovician) of the Girvan district, Ayrshire. Transactions of the Royal Society of Edinburgh, 65, 1 - 40. https: // doi. org / 10.1017 / S 0080456800012291
- Tripp, R. P. (1979) Trilobites from the Ordovician Auchensoul and Stinchar Limestones of the Girvan District, Strathclyde. Palaeontology, 22, 339 - 361.