Project 479: J. S. Albert, W. L. Fink. 2007. Phylogenetic Relationships of Fossil Neotropical Electric Fishes (Osteichthyes: Gymnotiformes) from the Upper Miocene of Bolivia. Journal of Vertebrate Paleontology. 27 (1):17-25.
Specimen: † Humboldtichthys kirschbaumi (RL:1596-4)


Fossil specimens of Neotropical gymnotiform electric fishes from the Yecua Formation (Upper Miocene, Parana basin, Bolivia) are analyzed in the context of a comprehensive study of gymnotiform relationships. Each fossil is analyzed individually and placed in the phylogeny according to characters it actually possesses. Some of the fossils previously referred to Humboldtichthys kirschbaumi can be identified only as Gymnotiformes incertae sedis, others as incertae sedis within recognized suprageneric gymnotiform taxa. The holotype of H. kirschbaumi shares the presence of a striated opercle with some extant species of Sternopygus and Distocyclus and can be placed in the Recent gymnotiform family Sternopygidae; H. kirschbaumi is diagnosed by the presence of a deeply striated opercle in which the striations extend between the dorsal and ventral opercular ridge fields. The analysis indicates the presence of several taxa among the fossil material. The presence of a multispecies assemblage is not uncommon among Recent gymnotiforms inhabiting non-floodplain forest streams, the inferred preservational environment.

Read the article »

Project DOI: 10.7934/P479,
This project contains
  • 1 Media
  • 3 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 181.68k

Download Project SDD File
Currently Viewing:
MorphoBank Project 479

    Authors' Institutions

    • University of Michigan

    • University of Louisiana


    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Maureen Admin
    Full membership
    James Albert
    Full membership

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views16329
    Project overview3482
    Media views5402Media search (4709 views); M90514 (693 views);
    Documents list1809
    Specimen list2605
    Taxon list2055

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project357
    Project downloads348
    Document downloads7Matrix and Tree (5 downloads); Appendix 1 (2 downloads);
    Media downloads2M90514 (2 downloads);