A new marrellomorph euarthropod from the Early Ordovician of Argentina

• Języki publikacji: EN

Abstrakty

EN

Marrellomorphs (class Marrellomorpha) are a group of Paleozoic arthropods with a very poor fossil record. Here we describe a new marrellomorph arthropod Mimetaster florestaensis sp. nov. from the Tremadocian (earliest Ordovician) of Argentina. The new species is characterized by the shape and direction of the three pairs of principal spines, and the existence of strong secondary spines only in the proximal two-thirds of the anterolateral spines. As a result of phylogenetic analysis the new species integrates a trichotomy with Mimetaster hexagonalis and a Moroccan unnamed marrellid as sister groups. This discovery increases the known diversity of Marrellomorpha and represents the first occurrence of this group in South America, expanding the spatial distribution of the clade.

Słowa kluczowe

EN

Argentina; Salta Province; Early Ordovician; Tremadocian; Floresta Formation; Arthropoda; Marrellomorpha; Mimetasteridae; Marrellida; Marrella; extinct species; fossil fauna; fossil record; paleontology; paleozoology

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2017
• Tom: 62
• Numer: 1
• Opis fizyczny: p.1-8,fig.,ref.

Twórcy

Bibliografia

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Identyfikatory

DOI

10.4202/app.00240.2016