Mammalia, Xenarthra, Cingulata, Dasypodoidea, Dasypodidae, Dasypodinae
DASYPUS BELLUS (SIMPSON, 1929)
Common Name: beautiful armadillo
Alternate Scientific Name: Tatu bellus, Propraopus bellus, Hyperoambon bellus
Source of Species Name: from the Latin word bellus, meaning beautiful or pretty. This is not one of the adjectives usually applied to armadillos, so Simpson was perhaps being ironic in this choice of names; but as he did not state the reason for the name in the original description, we will never know his extact intent.
Age Range: very early to latest Pleistocene; late Blancan to the end of the Rancholabrean land mammal ages; about 2.5 million to 11,000 years ago.
Florida Fossil Occurrences:
Figure 1. Map of Florida, with black circles indicating counties where fossils of Dasypus bellus have been found (the circles do not indicate a specific location within the county where the fossils were found, and some counties may have two or more different locations producing this species).
Florida Fossil Sites with Dasypus bellus:
Alachua County—Arredondo 2A; Haile 2B; Haile 7A; Haile 7C; Haile 7G; Haile 8A; Haile 10D; Haile 11B; Haile 13E; Haile 14A; Haile 14B; Haile 15A; Haile 16A; Haile 16B; Haile 20B; Haile 21A
Brevard County—Melbourne; Sebastian Canal 2; Tucker Borrow Pit
Charlotte County—El Jobean Shell Pit; McQueen Shell Pit
Citrus County—Inglis 1A; Inglis 1C; Inglis 1D; Inglis 1F; Inglis 1G; Inglis 2A; Lecanto 2A; Saber-tooth Cave
Columbia County—Ichetucknee River; Santa Fe River 1; Santa Fe River 2; Santa Fe River 4A; Santa Fe River 8A; Santa Fe River 18
Dade County—Cutler Hammock Site; Monkey Jungle Hammock
De Soto County—De Soto Shell Pit 5
Duval County—Jacksonville Beach; St. Johns River Dredgings
Hardee County—Fort Green Mine; Peace River near Zolfo Springs
Hillsborough County—Apollo Beach; Leisey Shell Pit 1A; Leisey Shell Pit 2; Leisey Shell Pit 3; Leisey Shell Pit 3A; Leisey Shell Pit 3B; Shell Materials Pit
Indian River County—Luther Locality, Winter Beach; Vero Site
Jefferson County—Aucilla River 2P
Levy County—McLeod Limerock Mine; Waccasassa River 1; Waccasassa River 2; Waccasassa River 3; Waccasassa River 4; Waccasassa River 5A; Waccasassa River 6; Waccasassa River 7; Waccasassa River 9A
Manatee County—Bradenton Field; Bradenton 51st Street
Marion County—Eichleberger Cave; Florida Lime Company Mine 2; Kendrick 1A; Mefford Cave 1A; Oklawaha River 1; Oklawaha River 3; Orange Lake 2A; Reddick 1A; Reddick 1B; Reddick 2C; Withlacoochee River 1A
Nassau County—North Fernandina Beach
Okeechobee County—Kissimmee 6
Orange County—Rock Springs
Pinellas County—Catalina Gardens; Millennium Park; Seminole Field
Polk County—Payne Creek Mine; Peace River Mine
Sarasota County—Macasphalt Shell Pit; Rigby Shell Pit
Seminole County—Wekiwa River 1
St. Johns County—Wilson Quarry
Sumter County—Coleman 2A; Coleman 3A
Taylor County—Aucilla River 3J
Volusia County—Daytona Beach Bone Bed
Overall Geographic Range: Southeastern, south-central, and midwestern United States, including occurrences throughout Florida (Fig. 1) and also in Georgia, South Carolina, Tennessee, West Virginia, Indiana, Iowa, Missouri, Nebraska, Kansas, and Texas (Klippel and Parmalee, 1984; Voorhies, 1987; Shubert and Graham, 2000). The type locality is Seminole Field, Pinellas County, Florida.
Comments: On average, the osteoderms of the shell and the limb bones of Dasypus bellus are about two to two and a half times the size of those of the living nine-banded armadillo Dasypus novemcinctus. Fossils of Dasypus bellus have been found at many types of
sites in Florida, including caves, sinkholes, river sites, coastal, and lake deposits. Isolated osteoderms are the most frequent type of fossil found, as is typical with cingulates generally. The two
most common types of osteoderms recovered are the hexagonal elements that comprise most of the shoulder (pectoral) and pelvic regions of the carapace, the so-called buckler or immovable osteoderms
(Fig. 2A), and the elongate rectangular elements from the movable bands (Fig. 2B), the imbricating or movable osteoderms (Holmes and Simpson, 1931; Hill, 2006). A partial articulated shell (Fig. 3)
appears to have only seven or eight movable bands, although detailed study of this crushed specimen is needed to confirm this.
Figure 2. Osteoderms of Dasypus bellus. A, UF 136057, an immovable or buckler osteoderm in dorsal, lateral, and ventral views (top to bottom). Specimen from Haile 16A, Alachua County, Florida; early Pleistocene. B, UF/TRO 6831, a movable or imbricating osteoderm in dorsal, lateral, and ventral views (left to right). Specimen from Inglis 1A, Citrus County, Florida; early Pleistocene.
Figure 3. UF 61906, partial articulated carapace of Dasypus bellus from the Shell Materials Pit, Hillsborough County, Florida; early Pleistocene. This is the only known large section of a carapace of this species found articulated in Florida. The top image shows the entire specimen in dorsal view, while below is a close-up view of the pelvic buckler region.
Like Dasypus novemcinctus, Dasypus bellus has small, simple, peg-like teeth (Fig. 4). The more posterior teeth have two flat wear surfaces that meet at a shallow angle, while the more anterior teeth have a single, slanted wear surface. The diet is thought to be similar to the modern species, largely invertebrate animals, but the larger size of the fossil species may have allowed successful capture of more small vertebrate animals, such as lizards and ground birds. The skull is fragile and rarely preserves intact. The specimen shown in Figure 5 is the rare exception.
Figure 4. UF 16698, associated right mandible and partial maxilla of Dasypus bellus from Haile 15A, Alachua County, Florida. A, lateral; B, dorsal; and C, medial (lingual) views of the mandible. D, medial (lingual); and E, lateral (buccal) views of the partial maxilla. Note the short, peg-like teeth. Left scale bar is for the mandible (A-C), while the right scale bar is for the maxilla.
Figure 5. UF 201289, nearly complete skull of Dasypus bellus from Inglis 2A, Citrus County, Florida; early Pleistocene. Above, dorsal view; below, ventral view. This is the most complete skull known for the species.
Dasypus bellus is not especially closely related (or ancestral) to
Dasypus novemcinctus, but instead likely shares a closer common ancestry with several species of large armadillos from the Pleistocene of South America, including Propraopus sulcatus
and Propraopus grandis. This resemblance was noted in Simpson’s original description of the species in 1929, and Dasypus bellus is frequently referred to the genus Propraopus
by South American authors (e.g., Pitana and Ribeiro, 2007). However, Rincón et al. (2008) found that features of the osteoderms shared by Dasypus bellus and Propraopus are also present
in the largest living species of Dasypus, Dasypus kappleri, from tropical South America. Dasypus bellus and Dasypus kappleri also share a large, unreduced fifth digit on
the manus, by which they differ from Dasypus novemcinctus that has a reduced manual fifth digit. As noted by Rincón et al. (2008), Dasypus kappleri is the type species of a generic name
(Hyperoambon) that has priority over Propraopus. In a more recent analysis, Castro et al. (2013) disputed a close relationship between Dasypus kappleri and Propraopus, but
their study did not include Dasypus bellus.
There is a modest trend for increase in average size from the late Pliocene through the middle Pleistocene for Dasypus bellus (McDonald, 2005), although much less than in some other contemporaneous genera of xenarthrans (notably Holmesina, Megalonyx, and Paramylodon). Because of the apparent small amount of evolutionary change in Dasypus bellus, it is not a valuable species for biochronology.
Figure 6. UF 3350, right femur of Dasypus bellus from Haile 8A, Alachua County, Florida; late Pleistocene. Left, anterior view; right, posterior view.
Figure 7. Ankle bones of Dasypus bellus from Haile 15A, Alachua County, Florida; early Pleistocene. A, posterior; B, anterior; and C, lateral views of UF/TRO 2070, right calcaneum. D, anterior; and E, posterior views of UF 16695, right astragalus.
View an image gallery of this species.[Not yet available!]
Scientific Publications and Other References Cited:
Auffenberg, W. 1957. A note on an unusually complete specimen of Dasypus bellus (Simpson) from Florida. Quarterly Journal Florida Academy of Sciences, 20(4):233-237.
Castro, M. C., A. M. Ribeiro , J. Ferigolo, and M. C. Langer. 2013. Redescription of Dasypus punctatus Lund, 1840 and considerations on the genus Propraopus Ameghino, 1881 (Xenarthra, Cingulata), Journal of Vertebrate Paleontology 33(2):434-447. http://dx.doi.org/10.1080/02724634.2013.729961Downing, K. F., and R. White. 1995. The cingulates (Xenarthra) of Leisey Shell Pit 1A (Irvingtonian), Hillsborough County, Florida. Bulletin of the Florida Museum of Natural History 37:375-396. http://ufdcweb1.uflib.ufl.edu/UF00095791/00002/35j
Hill, R. V. 2006. Comparative anatomy and histology of xenarthran osteoderms. Journal of Morphology 267:1441-1460. http://onlinelibrary.wiley.com/doi/10.1002/jmor.10490/pdf
Holmes, W. W., and G. G. Simpson. 1931. Pleistocene exploration and fossil edentates in Florida. Bulletin of the American Museum of Natural History 59(7):383-418. http://hdl.handle.net/2246/347
Klippel, W. E., and P. W. Parmalee. 1984. Armadillos in North American late Pleistocene contexts. Pp. 149-160 in H. H. Genoways and M. R. Dawson (eds.), Contributions in Quaternary Vertebrate Paleontology: a Volume in Memorial to John E. Guilday. Carnegie Museum of Natural History, Special Publication No. 8.
McDonald, H. G. 2005. Paleoecology of extinct xenarthrans and the Great American Biotic Interchange. Bulletin of the Florida Museum of Natural History 45(4):313-333. http://www.flmnh.ufl.edu/bulletin/Mcdonaldlowres.pdf
Pitana, V. G., and A. M. Ribeiro. 2007. Novos materiais de Propraopus Ameghino, 1881 (Mammalia, Xenarthra, Cinulata) do Pleistoceno final, Rio Grande do Su, Brasil. Gaea 3(2):60-67. http://www.unisinos.br/publicacoes_cientificas/images/stories/pdf_gaea/vol3n2/60a67_art02_pitana_e_ribeiro_gaea3%5B2%5D.pdf
Rincón, A. D., R. S. White, and H. G. McDonald. 2008. Late Pleistocene cingulates (Mammalia: Xenarthra) from Mene de Inciarte tar pits, Sierra de Perijá, western Venezuela. Journal of Vertebrate Paleontology 28(1):197-207. http://dx.doi.org/10.1671/0272-4634(2008)28[197:LPCMXF]2.0.CO;2
Schubert, B. W., and R. W. Graham. 2000. Terminal Pleistocene armadillo (Dasypus) remains from the Ozark Plateau, Missouri, USA. PaleoBios 20(1):1-6. http://docubase.berkeley.edu/cgi-bin/pl_dochome?query_src=pl_search&collection=PaleoBios+Archive+Public&id=101
Simpson, G. G. 1929. Pleistocene mammalian fauna of the Seminole Field, Pinellas County, Florida. Bulletin of the American Museum of Natural History 56(8):561-599. http://hdl.handle.net/2246/1326
Slaughter, B. H. 1961. The significance of Dasypus bellus (Simpson) in Pleistocene local faunas. Texas Journal of Science 13:11-15.
Voorhies, M. R. 1987. Fossil armadillos in Nebraska: the northernmost record. The Southwestern Naturalist 32(2):237-243. http://www.jstor.org/stable/3671566
Original Author(s): Richard C. Hulbert Jr.
Original Completion Date: September 12, 2013
Last Up-dated On:
This material is based upon work supported by the National Science Foundation under Grant Number CSBR 1203222, Jonathan Bloch, Principal Investigator. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
Copyright © 2013 by Florida Museum of Natural History, University of Florida