Isaac Magallanes

  • 2 months, 1 week ago
    Isaac Magallanes posted a new activity comment

    I may be a little late as I will be returning from a field trip to the bat cave with one of the physical geology labs at 11:30 am.

  • 5 months, 1 week ago
    Isaac Magallanes joined the group Bookworms
  • 5 months, 2 weeks ago
    Isaac Magallanes posted a new activity comment

    If our lab meeting is scheduled before 1:00pm it works for me. I TA on wednesdays at 3:00 so I would like some time to prep.

  • 5 months, 2 weeks ago
    Isaac Magallanes posted a new activity comment

    I’m currently working on setting up a meeting with the Instructor for the class I’m TA’ing that day. Those times work but I want to let him know my availability as soon as I can.

  • 6 months, 1 week ago
    Isaac Magallanes posted an image in the group Vacation Explorers from the myFOSSIL app

    Check out this Allosaurus exhibit at Virginia Tech University! Its posture is incorrect and shows an old way that scientists thought dinosaurs stood. #fossil

  • 6 months, 4 weeks ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    Carcharias cuspidata teeth collected from Belgrade #fossil #event #collection_site

  • 7 months ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    This fossil cetacean (whale) vertebra collected at Belgrade stands out amongst lots of shark teeth! #fossil #event #collection_site

  • 7 months ago
    Isaac Magallanes posted an image in the group Education and Outreach from the myFOSSIL app

    This week we have Raymond M. Alf Museum collections manager and outreach extraordinare, Gabriel Santos visiting!

  • 7 months, 1 week ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    Shark vertebra collected from Belgrade #fossil #collection_site

  • 7 months, 1 week ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    Sorting out more shark teeth/ray plates this morning! Look at all the different types our crew found #fossil #event #collection_site

  • 7 months, 1 week ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    These are some Anoxypristis (sawfish) teeth collected Lee C. #fossil #collection_site #method

  • 7 months, 2 weeks ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app
  • 7 months, 3 weeks ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    Check put these teeth from the extinct snaggletooth shark Hemipristis serra collected by Rob Birchfield #fossil #event #collection_site

  • 7 months, 3 weeks ago
    Isaac Magallanes posted an image in the group Belgrade 2018 from the myFOSSIL app

    Hello everyone! UF graduate student Isaac Magallanes here and today I will be identifying some of the cool fossils found earlier this year at the Belgrade fossil collecting event! Stay tuned to see some of the cool stuff you all found! #fossil #event #collection_site

  • 8 months, 1 week ago
    Isaac Magallanes posted an image in the group Education and Outreach from the myFOSSIL app

    Today Dr. Bruce MacFadden is working with K-12 educators to develop lesson plans teaching deep time and local paleontology in New Mexico #fossil #event #method

  • Hello everyone! For this forum post I wanted to discuss a recent paper by Isaac Magallanes (myself), James F. Parham, Gabriel-Philip Santos, and Jorge Velez-Juarbe (2018), published in the open access journal PeerJ.

     

    The paper “A new tuskless walrus from the Miocene of Orange County, California, with comments on the diversity and taxonomy of odobenids” describes the new fossil walrus from Southern California. This specimen represents the most complete fossil walrus known to date and provides insights on the evolution of this enigmatic group.

     

    If you don’t have time to read the full paper, here are the key details:

     

     

    Who: Researchers from Cal State Fullerton, Los Angeles Museum of Natural History, and the Raymond M. Alf museum.

     

    What: Description of a nearly complete male tusk-less fossil walrus

     

    Where: Collected in Orange County, Southern California.

     

    When: Late Miocene (6.6-5.8 Ma)

     

    Why: Modern walruses are the sole extant member of a once more diverse lineage, the Southern California specimen offers an opportunity to better understand their evolution, diversity, and geographic distribution.

     

     You can also read the abstract provided by the authors:

     

    “We describe Titanotaria orangensis (gen. et. sp. nov.), a new species of walrus (odobenid) from the upper Miocene Oso Member of the Capistrano Formation of Orange County, California. This species is important because: (1) It is one of the best-known and latest-surviving tuskless walruses; (2) It raises the number of reported odobenid taxa from the Oso Member to four species making it one of the richest walrus assemblages known (along with the basal Purisima of Northern California); (3) It is just the second record of a tuskless walrus from the same unit as a tusked taxon. Our phylogenetic analysis places T. orangensis as sister to a clade that includes Imagotaria downsiPontolis magnusDusignathus spp., Gomphotaria pugnax, and Odobeninae. We propose new branch-based phylogenetic definitions for Odobenidae, Odobeninae, and a new node-based name (Neodobenia) for the clade that includes Dusignathus spp., G. pugnax, and Odobeninae. A richness analysis at the 0.1 Ma level that incorporates stratigraphic uncertainty and ghost lineages demonstrates maximum peaks of richness (up to eight or nine coeval lineages) near the base of Odobenidae, Neodobenia, and Odobenini. A more conservative minimum curve demonstrates that standing richness may have been much lower than the maximum lineage richness estimates that are biased by stratigraphic uncertainty. Overall the odobenid fossil record is uneven, with large time slices of the record missing on either side of the Pacific Ocean at some times and biases from the preserved depositional environments at other times. We recognize a provisional timescale for the transition of East Pacific odobenid assemblages that include “basal odobenids” (stem neodobenians) from the Empire and older formations (>7 Ma), to a mixture of basal odobenids and neodobenians from the Capistrano and basal Purisima (7–5 Ma), and then just neodobenians from all younger units (<5 Ma). The large amount of undescribed material will add new taxa and range extensions for existing taxa, which will likely change some of the patterns we describe.”

     

    Open access link to paper:

    https://peerj.com/articles/5708/

     

    Article summary:

    http://news.fullerton.edu/2018fa/walrus-fossil-research.aspx

     

    Questions for discussions:

    • What morphological similarities/differences between the modern walrus and fossil walruses were most interesting?
    • The specimen described showed evidence of a healed injury on the left side of the skull. How do you think this could have happened?
    • Stratigraphic uncertainty and a large amount of undescribed material play a significant role in reporting diversity and taxonomic richness. How do you think this problem affects not only this report but paleontology as a whole?

     

  • 8 months, 1 week ago
    Isaac Magallanes posted an image in the group GABI-RET 2018 Cohort 6-The North American Connection from the myFOSSIL app

    Yesterday I presented my research on Stable Carbon and Oxygen Isotopes from the Northern New Mexico! Thanks to the GABI-RET Cohort 6 that helped me throughoit this last summer in collecting fossils! #fossil #event #method

  • 8 months, 1 week ago
    Isaac Magallanes posted an image in the group Education and Outreach from the myFOSSIL app

    The Society of Vertebrate Paleontology Annual Meeting 2018 is officially underway! #fossil #event

  • 8 months, 1 week ago
  • 8 months, 3 weeks ago
    Isaac Magallanes posted an image in the group Vacation Explorers from the myFOSSIL app

    Here are some awesome T. Rex’s in the dinosaur hall at the Natural History Museum of Los Angeles. Make sure to visit if you are ever in LA! #fossil

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