Kansas Herpetofaunal Atlas

Ilia from Anaxyrus hibbardi, (actual length 11 mm) from the Middle Pliocene of Kansas. From Tihen (1962; Figure 36)

Illustration of sacra of *A. hibbardi* (Middle Pliocene, Kansas) attributed to Taylor, 1941 (Tihen, 1962; Figure 62).

An illustration (Figure 5) of *Anaxyrus hibbardi* (KUMVP 1472) from the original description (Taylor, 1941). Sacral vertebra.

AMPHIBIA (Amphibians) ANURA (Frogs) BUFONIDAE (True Toads)

Hibbard's Toad
†Anaxyrus hibbardi (Taylor 1941)
ăn-ăk-sĕr'-ōs — hibbardi

Conservation Status:
Extinct

Diagnosis:
A fairly large Anaxyrus of the americanus group with very heavy, porous to granular supraorbital and postorbital crests; nearly the entire posterior portion of the frontoparietal, including the otic plate, is covered by the material of the crests; ilial prominence high, with the anterior slope much steeper than the posterior; sacral centrum relatively long and narrow; crests on the neural arch of the sacrum variable (Tihen, 1962).

Distribution:
KUMVP 1437, a sacral vertebra, complete excepting for the terminal portions of the diapophyses, from the Middle Pliocene (Hemphillian) Edson Beds, Ogallala formation, Sherman County, Kansas. The form is known only from the Middle Pliocene (Hemphillian) Edson Beds of Sherman County, Kansas. Additional vertebral and appendicular elements also in the collection of the Kansas University Museum of Vertebrate Paleontology (6395-6417, 7704).
(, Museum Voucher) (, Observation) (, Literature Record) (, iNat Record), ( Fossil)
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Occurrence Summary:
30
Records
30
Museum Vouchers
0
Other Observations

Some county occurrences indicated below may be too imprecise to map above.
County Breakdown: County Name (# occurrences):
Sherman (29); Trego (1);

Natural History:

Remarks:
The holotype of Bufo hibbardi is a sacrum (KUMNH 1437) from the Upper Miocene of Edson Quarry (Kansas, U.S.A.), although other disarticulated skeletal elements are also known (Taylor, 1937). Later taxonomic reviews (Tihen, 1962; Holman, 1975; Sanchiz, 1998a; Holman, 2003) placed this species in the Bufo (americanus) species group of Tihen (1962), which is currently included in the genus Anaxyrus. Moreover, using exclusively the morphology of the ilium, Bever (2005) found that the features observed in Bufo hibbardi overlap with the character suites of several living species, all of which are currently considered as members of the genus Anaxyrus. The adscription of this species to the latter genus seems warranted, and consequently the combination nova Anaxyrus hibbardi (Taylor, 1937) was formally proposed by Martin et al (2012).

Bibliography:

1937	Taylor, Edward H. Una nueva fauna de batracios anuros del Plioceno medio de Kansas. [A new fauna of anuran batrachians from the Middle Pliocene of Kansas]. Anales del Instituto de Biología, Universidad Nacional Autónoma de México 7(4):513-529 Name Scaphiopus pliobatrachus, Bufo hibbardi, and Bufo arenarius from Sherman County, Kansas. In Spanish.
1939	Hibbard, Claude W. Notes on additional fauna of Edson Quarry of the Middle Pliocene of Kansas. Transactions of the Kansas Academy of Science 42():457-462 Among many mammals, the paper mentions Plioambystoma kanensis, Scaphiopus pliobatrachus, Anaxyrus arenarius, Anaxyrus hibbardi, a Chelydridae listed as Chelonia [sic] sp., and Testudo sp.
1941	Taylor, Edward H. Extinct toads and salamanders from Middle Pliocene beds of Wallace and Sherman counties, Kansas. State Geological Survey of Kansas, Bulletin 38(6):177-196 Original descriptions of Anaxyrus hibbardi, Anaxyrus arenarius, Scaphiopus antiquus, Scaphiopus pliobatrachus, Ambystoma kansense, Plioambystoma kansense, Lanebatrachus martini, and Ogallalabatrachus horarium
1945	Lane, Henry H. A survey of the fossil vertebrates of Kansas, Part II. Amphibia. Transactions of the Kansas Academy of Science 48(3):286-316
1962	Tihen, Joseph A. A review of new world fossil bufonids. American Midland Naturalist 68(1):1-50
1964	Estes, Richard and Joseph A. Tihen. Lower vertebrates from the Valentine Formation of Nebraska. The American Midland Naturalist 72(2):53-472 Contains the original description of Anaxyrus valentinensis.
1975	Holman, J. Alan. Herpetofauna of the WaKeeney local fauna (Lower Pliocene: Clarendionian) of Trego County, Kansas. Pages 49-66 in Studies on Cenozoic Paleontology and Stratigraphy in honor of Claude W. Hibbard. Museum of Paleontology, The University of Michigan, Ann Arbor, Michigan. pp.
1985	Schultze, Hans-Peter, L. Hunt, J. Chorn, and A. M. Neuner. Type and figured specimens of fossil vertebrates in the collection of the University of Kansas Museum of Natural History. Part II. Fossil amphibians and reptiles. University of Kansas Museum of Natural History, Miscellaneous Publications (77):1-66 Also check on several listed names not in KHA as KS taxa.
2012	Martin, Carolina (Albaladejo), Borja Sanchiz, and Miguel Angel Alonso-Zarazaga. Nomenclatural notes on living and fossil amphibians. Graellsia 68(1):159-180 References Kansas specimens of Bufo hibbardi from Edson Quarry, Bufo pliocompactilis from WaKeeney, Bufo repentinus from Cragin Quarry, Bufo rexroadensis and Bufo suspectus from Fox Canyon, Bufo spongifrons from Long Island Quarry, and nine Rana from Rexroad.

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