The Compendium of the Phanerozoic Type Species of the Class Bivalvia and its Applications
DOI:
https://doi.org/10.17161/pc.vi24.25546Keywords:
Phanerozoic, BivalviaAbstract
The detection of synoptical megatrends in the Phanerozoic fossil record requires a robust taxonomic database at the outset. However, large-scale taxonomic data are often unavailable or outdated, or insufficiently standardized, even for major macroinvertebrate groups. Additionally, large-scale syntheses usually require well-resolved genus-level data, which in turn is objectively defined by and anchored to its designated type species, making type species an indispensable part of taxonomic compilations. For the Class Bivalvia, large-scale, systematic compilations are available for all Phanerozoic genera, but a compendium of bivalve type species is lacking. Here, we provide a global, taxonomically standardized, and updated type species compendium of marine bivalves for the entire Phanerozoic. Our type species compilation enlists 2,822 valid genera, their temporal ranges, with details of the methods of typification. We further quantitatively evaluate whether the systematics of bivalve type species have been historically stable or not, using a modified “flux ratio”. Moreover, as type species are representatives of their genera, we statistically compare the longevity of the type species and its parent genus to assess whether the type actually represents the genus’s temporal range. Our results indicate that approximately 63% of original names assigned to bivalve type species have been reassigned. Moreover, only about 38% of bivalve type species span at least 50% of their genus’s temporal range, and the type species had their stratigraphic range at the early phases of the genus’s stratigraphic range. Our findings reiterate that, though type species are the representatives of respective genera, the temporal longevity of the types should not be used as a direct proxy for their generic longevity.
Supplemental Data
Table 1: https://journals.ku.edu/treatiseonline/libraryFiles/downloadPublic/351
Appendix 1: https://journals.ku.edu/treatiseonline/libraryFiles/downloadPublic/352
Downloads
Published
Issue
Section
License
This work is licensed under a Creative Commons Attribution 4.0 International License.
- Authors retain copyright and the works are licensed under a Creative Commons Attribution 4.0 License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access)
