Mimetaster

Mimetaster; Temporal range: Lower Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	†Marrellomorpha
Order:	†Marrellida
Family:	†Mimetasteridae
Genus:	†Mimetaster; Gürich, 1932
Type species
	Mimetaster hexagonalis; Gürich 1931
Species
	M. florestaensis Aris et al. 2017; M. hexagonalis Gürich 1931 (type);

Mimetaster is a marrellomorph arthropod. The type species, Mimetaster hexagonalis is known from the Lower Devonian (Pragian-Emsian) Hunsrück Slate,^[1] and is the most common arthropod (trilobites excluded) from the locality, known from over 100 specimens including three juveniles.^[2] The animals probably lived in small groups.^[2]

Mimetaster florestaensis is characterized by three pairs of principal spines, as well as strong secondary spines in the proximal two-thirds of the anterolateral spines. It was found in the Lower Ordovician (Tremadocian) Floresta Formation of Argentina, the first occurrence of this group in South America.^[3] However the taxon is quite different from the type species, and might be warranted to be placed in Furca or a new genus.^[4]

References

^ Stürmer, W; Bergström, J (1976). "The arthropods Mimetaster and Vachonisia from the Devonian Hunsrück Shale". Paläontologische Zeitschrift. 50 (1): 78–111. doi:10.1007/bf03001974.
^ ^a ^b Kühl, G.; Rust, J. (2010). "Re-investigation of Mimetaster hexagonalis: a marrellomorph arthropod from the Lower Devonian Hunsrück Slate (Germany)". Paläontologische Zeitschrift. 84: 397. doi:10.1007/s12542-009-0049-x.
^ Aris, Maria; Corronca, Jose; Quinteros, Sebastián; Pardo, Paolo (2017). "A new marrellomorph euarthropod from the Early Ordovician of Argentina". Acta Palaeontologica Polonica. 62. doi:10.4202/app.00240.2016. ISSN 0567-7920.
^ Moysiuk, Joseph; Izquierdo-López, Alejandro; Kampouris, George E.; Caron, Jean-Bernard (July 2022). "A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf". Journal of Paleontology. 96 (4): 859–874. doi:10.1017/jpa.2022.11. ISSN 0022-3360.

[1] Stürmer, W; Bergström, J (1976). "The arthropods Mimetaster and Vachonisia from the Devonian Hunsrück Shale". Paläontologische Zeitschrift. 50 (1): 78–111. doi:10.1007/bf03001974.

[Kühl2010-2] Kühl, G.; Rust, J. (2010). "Re-investigation of Mimetaster hexagonalis: a marrellomorph arthropod from the Lower Devonian Hunsrück Slate (Germany)". Paläontologische Zeitschrift. 84: 397. doi:10.1007/s12542-009-0049-x.

[3] Aris, Maria; Corronca, Jose; Quinteros, Sebastián; Pardo, Paolo (2017). "A new marrellomorph euarthropod from the Early Ordovician of Argentina". Acta Palaeontologica Polonica. 62. doi:10.4202/app.00240.2016. ISSN 0567-7920.

[4] Moysiuk, Joseph; Izquierdo-López, Alejandro; Kampouris, George E.; Caron, Jean-Bernard (July 2022). "A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf". Journal of Paleontology. 96 (4): 859–874. doi:10.1017/jpa.2022.11. ISSN 0022-3360.

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