Cryptoprocta spelea
| Cryptoprocta spelea | |
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| Species: | C. spelea
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| Cryptoprocta spelea G. Grandidier, 1902
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Cryptoprocta spelea, also known as the giant fossa,[3] is an extinct species of euplerid carnivore from Madagascar. First described in 1902 and recognized as a separate species in 1935, it is larger than its close relative, the living fossa (Cryptoprocta ferox), but otherwise similar. However, the two have not always been accepted as distinct species. When and how the larger form went extinct is unknown; there is some anecdotal evidence, including reports of very large fossas, that there is more than one surviving species.
The species is known from subfossil bones found in a variety of caves in northern, western, southern, and central Madagascar. In some, it occurs together with remains of C. ferox, but there is no evidence that the two lived at the same time. Their difference in size is in line with that found between living species pairs of related carnivores found together. C. spelea would have been able to prey on larger animals than C. ferox can, including the extinct subfossil lemurs.
Taxonomy
In 1902, Guillaume Grandidier described subfossil carnivoran remains from two caves on Madagascar as a larger "variety" of the living fossa (Cryptoprocta ferox), C. ferox var. spelea. G. Petit, writing in 1935, considered spelea to represent a distinct species.[2] Charles Lamberton reviewed subfossil and living Cryptoprocta in 1939 and agreed with Petit in recognizing two species,[4] naming this species from a specimen found at Ankazoabo Cave near Itampolo. The specific name spelea means "cave" and was given because of the location of its discovery.[5] However, Lamberton apparently had at most three skeletons of the living fossa, not nearly enough to capture the range of variation in that species, and some later authors did not separate C. spelea and C. ferox as species.[6] Steven Goodman and colleagues, using larger samples, compiled another set of Cryptoprocta measurements that was published in a 2004 article. They found that some subfossil Cryptoprocta fell outside the range of variation of living C. ferox, and identified those as representing C. spelea.[7] Grandidier had not designated a type specimen for the species, and to maintain C. spelea as the name for the larger form of the fossa, Goodman and colleagues designated a neotype.[8]
Lamberton also recognized a third species, Cryptoprocta antamba, on the basis of a mandible (lower jaw) that was different in form than other Cryptoprocta mandibles. The specific name refers to the "antamba", an animal allegedly from southern Madagascar described by Étienne de Flacourt in 1658 as a large, rare, leopard-like carnivore that eats men and calves and lives in remote mountainous areas;[9] it may have been the giant fossa.[10] Goodman and colleagues could not locate Lamberton's material of Cryptoprocta antamba, but suggested that it was based on an abnormal C. spelea.[11]
Description
Although some morphological differences between the two fossa species have been described, these may be allometric (growth-related), and in their 1986 Mammalian Species account of the fossa, Michael Köhncke and Klaus Leonhardt wrote that the two were morphologically identical.[12] However, remains of C. spelea are larger than any living C. ferox. Goodman and colleagues found that skull measurements in specimens they identified as C. spelea were 1.07 to 1.32 times as large as in adult C. ferox, and postcranial measurements were 1.19 to 1.37 times as large.[7] The only specimen of C. spelea in which condylobasal length (a measure of total skull length) could be ascertained, measured 153.4 mm (6.04 in), compared to a range of 114.5 to 133.3 mm (4.51 to 5.25 in) in adult C. ferox. Humerus (upper arm bone) length in twelve C. spelea is 122.7 to 146.8 mm (4.83 to 5.78 in), averaging 137.9 mm (5.43 in), compared to 108.5 to 127.5 mm (4.27 to 5.02 in), averaging 116.1 mm (4.57 in), in the extant fossa.[13] Body mass estimates for C. spelea range from 17 kg (37 lb)[14] to 20 kg (44 lb),[15] and it was among the largest carnivores of the island.[16]
Distribution, ecology, and extinction
Cryptoprocta spelea is the only extinct member of order Carnivora known from Madagascar;[5] recently extinct Madagascan animals also include at least 17 species of lemurs, most of which are larger than the living forms,[11] as well as elephant birds and Malagasy hippopotamuses, among others.[17] Subfossil remains of the giant fossa have been found in Holocene cave sites[2] from the northern end of Madagascar along the west coast to the far south, and in the central highlands. Some sites have yielded both C. spelea and smaller remains referable to the living species, C. ferox; however, lack of robust stratigraphic knowledge and no available radiocarbon dating on subfossil Cryptoprocta bones makes it uncertain whether the two were truly contemporaneous.[18] The size ratio between the two species is within the range of ratios seen between similar-sized living cats and mongooses found in the same areas, suggesting that the two species may have been able to occur together.[19] With its large size and massive jaws and teeth,[20] C. spelea was a formidable, "puma-like"[21] predator, and in addition to smaller lemurids, it may have eaten some of the big, now extinct subfossil lemurs that would have been too large for C. ferox.[22] Although no subfossil evidence has been found to definitively show that lemurs were its prey, this assumption is based on the diet of the smaller, extant species of fossa.[23] Other possible prey include tenrecs, smaller euplerids, and even young Malagasy hippopotamuses.[24] Its extinction may have changed predation dynamics on Madagascar.[25]
The IUCN Red List currently lists C. spelea as an extinct species; it likely survived into the "recent geological past", but why it went extinct remains unknown.[1] However, local people on Madagascar often recognize two forms of fossa, a larger fosa mainty (or "black Cryptoprocta") and a smaller fosa mena (or "reddish Cryptoprocta").[26] There are also some anecdotal records of very large living fossas, such as a 2-m (7 ft), 30-kg (70 lb) fossa at Morondava. Goodman and colleagues suggested that further research may demonstrate that there is more than one species of fossa yet alive.[19]
References
- ^ a b Hoffman, 2008
- ^ a b c Goodman et al., 2004, p. 130
- ^ Alcover and McMinn, 1994, table 1
- ^ Goodman et al., 2001, pp. 130–131
- ^ a b Goodman et al., 2003, p. 1167
- ^ Goodman et al., 2004, p. 131
- ^ a b Goodman et al., 2004, p. 136
- ^ Goodman et al., 2004, pp. 136–137
- ^ Goodman et al., 2003, p. 1169; 2004, p. 131
- ^ Turvey, 2009, p. 34
- ^ a b Goodman et al., 2004, p. 137
- ^ Köhncke and Leonhardt, 1986, p. 2
- ^ Goodman et al., 2004, table 1
- ^ Personal communication from R. Dewer in Burness et al., 2001, table 1
- ^ Wroe et al., 2004, p. 297
- ^ Burness et al., 2001, table 1
- ^ Burney et al., 2004, p. 25
- ^ Goodman et al., 2003, pp. 1167–1168; 2004, pp. 140–141
- ^ a b Goodman et al., 2004, p. 141
- ^ Goodman et al., 2004, p. 138
- ^ Goodman, 2003, quoted in Colquhoun, 2006, p. 148
- ^ Goodman et al., 2004, pp. 138–140; Colquhoun, 2006, pp. 148, 156
- ^ Goodman, 2003, p. 1227
- ^ Alcover and McMinn, 1994, p. 14
- ^ Goodman et al., 2004, p. 140
- ^ Goodman et al., 2003, p. 1168; 2004, p. 141
Literature cited
- Alcover, J.A. and McMinn, M. 1994. Predators of vertebrates on islands (subscription required). BioScience 44(1):12–18.
- Burness, G.P., Diamond J. and Flannery, T. 2001. Dinosaurs, dragons, and dwarfs: The evolution of maximal body size (subscription required). Proceedings of the National Academy of Sciences 98(25):14518–14523.
- Burney, D.A., Burney, L.P., Godfrey, L.R., Jungers, W.L., Goodman, S.M., Wright, H.T. and Jull, A.J.T. 2004. A chronology for late prehistoric Madagascar (subscription required). Journal of Human Evolution 47(1–2):25–63.
- Colquhoun, I.C. 2006. Predation and cathemerality: Comparing the impact of predators on the activity patterns of lemurids and ceboids (subscription required). Folia Primatologica 77(1–2):143–165.
- Goodman, S.M. 2003. Predation on lemurs. Pp. 1221–1228 in Goodman, S.M. and Benstead, J.P. (eds.). The Natural History of Madagascar. University of Chicago Press. ISBN 0-226-30306-3
- Goodman, S.M., Ganzhorn, J.U. and Rakotondravony, D. 2003. Introduction to the mammals. Pp. 1159–1186 in Goodman, S.M. and Benstead, J.P. (ed.). The Natural History of Madagascar. University of Chicago Press. ISBN 0-226-30306-3
- Goodman, S.M., Rasoloarison, R.M. and Ganzhorn, J.U. 2004. On the specific identification of subfossil Cryptoprocta (Mammalia, Carnivora) from Madagascar. Zoosystema 26(1):129–143.
- Hoffman, M. 2008. Cryptoprocta spelea. In IUCN. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on May 20, 2010.
- Köhncke, M. and Leonhardt, K. 1986. Cryptoprocta ferox. Mammalian Species 254:1–5.
- Turvey, S.T. 2009. Holocene Extinctions. Oxford University Press US, 359 pp. ISBN 9780199535095
- Wroe, S., Field, J., Fullagar, R. and Jermiin, L.S. 2004. Megafaunal extinction in the late Quaternary and the global overkill hypothesis (subscription required). Alcheringa 28(1):291–331.