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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • High Attention Score compared to outputs of the same age (99th percentile)
  • High Attention Score compared to outputs of the same age and source (98th percentile)

Mentioned by

news
22 news outlets
blogs
7 blogs
twitter
109 tweeters
facebook
5 Facebook pages
wikipedia
3 Wikipedia pages
googleplus
2 Google+ users
reddit
1 Redditor

Citations

dimensions_citation
15 Dimensions

Readers on

mendeley
58 Mendeley
Title
Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of 'river dolphins' in the Americas.
Published in
PeerJ, September 2015
DOI 10.7717/peerj.1227
Pubmed ID
Authors

Nicholas D. Pyenson, Jorge Vélez-Juarbe, Carolina S. Gutstein, Holly Little, Dioselina Vigil, Aaron O’Dea, Pyenson, Nicholas D, Vélez-Juarbe, Jorge, Gutstein, Carolina S, Little, Holly, Vigil, Dioselina, O'Dea, Aaron

Abstract

In contrast to dominant mode of ecological transition in the evolution of marine mammals, different lineages of toothed whales (Odontoceti) have repeatedly invaded freshwater ecosystems during the Cenozoic era. The so-called 'river dolphins' are now recognized as independent lineages that converged on similar morphological specializations (e.g., longirostry). In South America, the two endemic 'river dolphin' lineages form a clade (Inioidea), with closely related fossil inioids from marine rock units in the South Pacific and North Atlantic oceans. Here we describe a new genus and species of fossil inioid, Isthminia panamensis, gen. et sp. nov. from the late Miocene of Panama. The type and only known specimen consists of a partial skull, mandibles, isolated teeth, a right scapula, and carpal elements recovered from the Piña Facies of the Chagres Formation, along the Caribbean coast of Panama. Sedimentological and associated fauna from the Piña Facies point to fully marine conditions with high planktonic productivity about 6.1-5.8 million years ago (Messinian), pre-dating the final closure of the Isthmus of Panama. Along with ecomorphological data, we propose that Isthminia was primarily a marine inhabitant, similar to modern oceanic delphinoids. Phylogenetic analysis of fossil and living inioids, including new codings for Ischyrorhynchus, an enigmatic taxon from the late Miocene of Argentina, places Isthminia as the sister taxon to Inia, in a broader clade that includes Ischyrorhynchus and Meherrinia, a North American fossil inioid. This phylogenetic hypothesis complicates the possible scenarios for the freshwater invasion of the Amazon River system by stem relatives of Inia, but it remains consistent with a broader marine ancestry for Inioidea. Based on the fossil record of this group, along with Isthminia, we propose that a marine ancestor of Inia invaded Amazonia during late Miocene eustatic sea-level highs.

Twitter Demographics

The data shown below were collected from the profiles of 109 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 58 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Brazil 2 3%
Argentina 2 3%
Costa Rica 1 2%
Germany 1 2%
Peru 1 2%
United States 1 2%
Ecuador 1 2%
Canada 1 2%
Unknown 48 83%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 10 17%
Researcher 10 17%
Student > Master 9 16%
Student > Ph. D. Student 9 16%
Other 5 9%
Other 15 26%
Readers by discipline Count As %
Agricultural and Biological Sciences 29 50%
Earth and Planetary Sciences 17 29%
Environmental Science 4 7%
Unspecified 4 7%
Biochemistry, Genetics and Molecular Biology 2 3%
Other 2 3%

Attention Score in Context

This research output has an Altmetric Attention Score of 296. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 14 June 2018.
All research outputs
#31,700
of 11,785,646 outputs
Outputs from PeerJ
#67
of 5,530 outputs
Outputs of similar age
#911
of 237,911 outputs
Outputs of similar age from PeerJ
#4
of 231 outputs
Altmetric has tracked 11,785,646 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 5,530 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 20.1. This one has done particularly well, scoring higher than 98% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 237,911 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 231 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 98% of its contemporaries.