English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Background  The Eocene was the warmest epoch of the Cenozoic and recorded the appearance of several orders of modern mammals, including the first occurrence of Euprimates. During the Eocene, Euprimates were mainly represented by two groups, adapiforms and omomyiforms, which reached great abundance and diversity in the Northern Hemisphere. Despite this relative abundance, the record of early Eocene primates from the European continent is still scarce and poorly known, preventing the observation of clear morphological trends in the evolution of the group and the establishment of phylogenetic relationships among different lineages. However, knowledge about the early Eocene primates from the Iberian Peninsula has been recently increased through the description of new material of the genus  Agerinia  from several fossil sites from Northeastern Spain.    Methods  Here we present the first detailed study of the euprimate material from the locality of Masia de l’Hereuet (early Eocene, NE Spain). The described remains consist of one fragment of mandible and 15 isolated teeth. This work provides detailed descriptions, accurate measurements, high-resolution figures and thorough comparisons with other species of  Agerinia  as well with other Eurasian notharctids. Furthermore, the position of the different species of  Agerinia  has been tested with two phylogenetic analyses.    Results  The new material from Masia de l’Hereuet shows several traits that were previously unknown for the genus  Agerinia,  such as the morphology of the upper and lower fourth deciduous premolars and the P 2 , and the unfused mandible. Moreover, this material clearly differs from the other described species of  Agerinia ,  A. roselli  and  A. smithorum , thus allowing the erection of the new species  Agerinia marandati . The phylogenetic analyses place the three species of  Agerinia  in a single clade, in which  A. smithorum  is the most primitive species of this genus.    Discussion  The morphology of the upper molars reinforces the distinction of  Agerinia  from other notharctids like  Periconodon . The analysis of the three described species of the genus,  A. smithorum, A. marandati  and  A. roselli , reveals a progressive change in several morphological traits such as the number of roots and the position of the P 1  and P 2 , the molarization of the P 4 , the reduction of the paraconid on the lower molars and the displacement of the mental foramina. These gradual modifications allow for the interpretation that these three species, described from the early Eocene of the Iberian Peninsula, are part of a single evolutionary lineage. The stratigraphical position of Masia de l’Hereuet and Casa Retjo-1 (type locality of  A. smithorum ) and the phylogenetic analyses developed in this work support this hypothesis.

Agerinia marandati sp. nov., a new early Eocene primate from the Iberian Peninsula, sheds new light on the evolution of the genus Agerinia