False Potto

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False potto

Scientific classification

(disputed)

Kingdom: Animalia

Phylum: Chordata

Class: Mammalia

Order: Primates

Family: Lorisidae

Subfamily: Perodicticinae

Genus: Pseudopotto

Schwartz, 1996

Species: P. martini

Binomial name

Pseudopotto martini

Schwartz, 1996

False pottoFrom Wikipedia, the free encyclopedia

The false potto (Pseudopotto martini) is a lorisoid primate of uncertaintaxonomic status found in Africa. Anthropologist Jeffrey H. Schwartz named itin 1996 as the only species of the genus Pseudopotto on the basis of twospecimens (consisting only of skeletal material) that had previously beenidentified as pottos (Perodicticus potto). The precise provenances of the twospecimens are uncertain, but at least one may have come from Cameroon.Schwartz thought the false potto could even represent a separate family, butother researchers have argued that the supposed distinguishing features of theanimal do not actually distinguish it from the potto; specifically, the false pottoshares several features with West African pottos.

The false potto generally resembles a small potto, but according to Schwartz itdiffers in having a longer tail, shorter spines on its neck and chest vertebrae, asmaller, less complex spine on the second neck vertebra, an entepicondylarforamen, a lacrimal fossa that is located inside the eye socket, a smaller upperthird premolar and molar, and higher-crowned cheekteeth, among other traits.However, many of these traits are variable among pottos; for example, oneresearcher found entepicondylar foramina in almost half of the specimens in hissample of pottos.

Contents

1 Taxonomy

2 Description3 Distribution and status

4 References4.1 Literature cited

Taxonomy

In a series of potto (Perodicticus potto) skeletons in the collections of the Anthropological Institute and Museumof the University of Zurich at Irchel, anthropologist Jeffrey H. Schwartz recognized two specimens with traits hebelieved distinct from all pottos, and in 1996 he used these two specimens to describe a new genus and species of

primate, Pseudopotto martini.[1] The specific name, martini, honors primatologist Robert D. Martin.[2] The exactprovenance of the two specimens is unknown, and one is represented by a complete skeleton (but no skin) and the

other by a skull only.[3] Schwartz placed both specimens in a single species, but noted that further study might

indicate that the two represent distinct species.[4] He thought the relationships of the new form were unknown anddifficult to assess and did not assign it to any family, but provisionally placed it closest to the family Lorisidae,

together with the potto, the angwantibos, and the lorises.[5] The discovery, published in the Anthropological

Papers of the American Museum of Natural History, was featured in Scientific American[6] and Science; the



The potto (Perodicticus potto,

pictured) is quite similar to the false

potto and may represent the same

species.

Science account noted that Schwartz thought Pseudopotto may represent a new family of primates.[7]

In 1998, the journal African Primates published three papers by primatologists on the false potto. Colin Groves

affirmed that it was probably distinct from the potto[8] and Simon Bearder cited it as an example of unrecognized

taxonomic diversity in lorisids,[9] but Esteban Sarmiento compared the new taxon to specimens of the potto andfound that the alleged distinctive traits of the false potto in fact fell within the range of variation of the potto, and that

the false potto was probably not even a species distinct from Perodicticus potto.[10] In 2000, primatologist B.S.Leon agreed that the false potto was not distinct from the subspecies Perodicticus potto potto, but noted thatvarious forms of potto were distinct enough from each other that there may indeed be more than one species of

potto.[11] Opinions since then have been divided: a 2003 compilation of African primate diversity concluded that

there was insufficient evidence that the false potto is a distinct species,[12] the primate chapter of the 2005 thirdedition of Mammal Species of the World, written by Groves, listed Pseudopotto as a genus but noted that it was

"controversial";[13] and Schwartz continued to recognize the false potto as a genus in 2005.[14] Also in 2005,primatologist David Stump reviewed some of the distinguishing features of Pseudopotto in the context of studyingvariation among pottos, and found that some but not all of the false potto's traits were found in some pottos, mainly

western populations (subspecies potto).[15]

Description

One of the specimens, AMZ 6698, is an adult female that lived in ZürichZoo. It is represented by a virtually complete skeleton, but the skin wasnot preserved. According to Schwartz, the skeleton shows signs ofosteoporosis and periodontitis (common in zoo animals), but not of otherpathologies or abnormalities. The right teeth were removed before

Schwartz studied the specimen.[3] Schwartz selected this specimen as the

holotype.[16] The other specimen, AMZ-AS 1730, is a subadult malecollected in the wild, of which only the skull, including the mandible(lower jaw), was preserved. The dentition includes both permanent and

deciduous teeth.[3] Specimens of Pseudopotto are at least superficially

similar to pottos,[17] but according to Schwartz, they differ in a number oftraits. Among lorisids, Schwartz saw similarities between the false potto

and true pottos as well as angwantibos and slow lorises (Nycticebus).[4]

The false potto is comparable in size to the smallest pottos, but falls

within their range of metrical variation;[18] small size is also seen in

western pottos.[11]

The tail, according to Schwartz, is longer than in the potto.[19] He does not provide measurements of the tail of

AMZ 6698 and notes that at least one vertebra is missing,[20] but Sarmiento counted 11 caudal vertebrae in an

illustration of AMZ 6698[21] and Groves counted at least 15.[8] However, Sarmiento found that the number of

caudal vertebrae ranges from 5 to 17, with an average of 11, in pottos.[21] Relatively long tails are also common in

the western form of the potto,[22], though according to Stump the tail of Pseudopotto is longer than any seen in

pottos.[23] The false potto allegedly has shorter spines on its cervical (neck) and first and second thoracic (chest)

vertebrae,[24] but Leon notes that this feature is also seen in western pottos.[11] Schwartz writes that the false pottodiffers from pottos and angwantibos in lacking a bifid (two-tipped) spine on the second cervical vertebra, but

Sarmiento found this feature in 3 out of 11 potto specimens he examined.[25]



The ulnar styloid process (a projection on the ulna, one of the bones of the forearm, where it meets the wrist) is not

as hooked as in other lorisids, according to Schwartz,[4] which Groves suggests may indicate that the wrist is more

mobile.[8] Another alleged diagnostic feature is the presence of an entepicondylar foramen (an opening near the

distal, or far, end of the bone) on the humerus (upper arm bone);[26] however, Sarmiento found this feature in 4 out

of 11 specimens, and on one side of a fifth,[25] and Stump noted that the foramen occurred in specimens from

across the potto's range.[23]

The lacrimal fossa, a depression in the skull, is located on the upper surface of the skull in most lorisids, but

Schwartz found that it was further to the back, inside the orbit (eye socket) in the false potto and the slow loris.[27]

Sarmiento found this feature in 3 out of 11 pottos examined.[25] The coronoid process of the mandible is said to be

more hooked in the false potto than in the potto and slow loris.[4]

Other distinguishing features of the false potto are in the dentition. Sarmiento notes, however, that captivespecimens may develop abnormalities in the teeth and that some dental characters Schwartz uses are quite variable,

sometimes even from one side of the same individual to another.[21] The third upper molar (M3) is more reduced in

the false potto than in any other prosimian, according to Schwartz,[28] but Leon notes that western pottos also have

a relatively small M3.[11] The third upper premolar (P3) is also reduced, resembling the condition in the fork-

marked lemurs (Phaner).[4] Stump writes that small P3s are also common in western pottos, although the false

potto's P3 is shaped differently.[23] Groves notes that P1 is quite long, another point of similarity with the fork-

marked lemurs.[8] The lower premolars are compressed laterally in Pseudopotto, the cusps on the cheekteeth arehigher, and the cristid obliqua (a crest connected to the protoconid cusp) is at a relatively buccal position (in the

direction of the cheeks).[4]

In AMZ 6698, skull length is 59.30 mm (2.335 in) and length of the right humerus is 57.65 mm (2.27 in).[29]

Distribution and status

According to records in the Anthropological Institute and Museum, AMZ 6698, the holotype, is from "Equatorial

Africa", and AMZ-AS 1730 is from the "Cameroons".[3] According to mammalogist Ronald Nowak, thesedesignations imply that the latter came either from modern Cameroon or far eastern Nigeria (British Cameroons)

and the former from Cameroon or a neighboring state.[30] In 1999, Simon Bearder claimed, citing a personal

communication by C. Wild, that Pseudopotto had been seen in the wild[31] and in 2001, ornithologist Christopher

Bowden noted the occurrence of Pseudopotto on Mount Kupe in Cameroon, also citing C. Wild.[32] However,the IUCN Red List notes that while sightings of the false potto at 820 to 940 m (2690 to 3080 ft) on Mount Kupehad been reported, surveys had failed to confirm its occurrence there, though pottos, some with long tails, had beenfound. The false potto is not listed separately from the potto in the Red List, because the evidence that it is a distinct

species is considered insufficient.[33]

References

1. ^ Schwartz 1996, pp. 2, 8.

2. ^ Schwartz 1996, p. 9.

3. ̂D E F G Schwartz 1996, p. 2.

4. ̂D E F G H I Schwartz 1996, p. 10.

5. ^ Schwartz 1996, pp. 8, 10, 12.



6. ^ Leutwyler 1996.

7. ^ Holden 1996.

8. ̂D E F G Groves 1998, p. 42.

9. ^ Bearder 1998, p. 43.

10. ^ Sarmiento 1998, p. 45.

11. ̂D E F G Leon 2000, p. 210.

12. ^ Grubb et al. 2003, p. 1323.

13. ^ Groves 2005, p. 123.

14. ^ Schwartz 2005, p. 185.

15. ^ Stump 2005, pp. 177–178.

16. ^ Schwartz 1996, p. 8.

17. ^ Schwartz 1996, p. 6; Groves 1998, p. 42; Nowak 1999, p. 494.

18. ^ Schwartz 1996, p. 12; Sarmiento 1998, p. 44.

19. ^ Schwartz 1996, p. 5.

20. ^ Schwartz 1996, p. 3.

21. ̂D E F Sarmiento 1998, p. 44.

22. ^ Leon 2000, p. 210; Stump 2005, p. 177.

23. ̂D E F Stump 2005, p. 177.

24. ^ Schwartz 1996, pp. 10–11, fig. 3.

25. ̂D E F Sarmiento 1998, table 1.

26. ^ Schwartz 1996, pp. 5, 10.

27. ^ Schwartz 1996, p. 12.

28. ^ Schwartz 1996, p. 10; Groves 1998, p. 42.

29. ^ Schwartz 1996, table 2.

30. ^ Nowak 1999, p. 494.

31. ^ Bearder 1999, p. 279.

32. ^ Bowden 2001, p. 14.

33. ^ Oates et al. 2008.

Literature cited

Bearder, S.K. (1998). "Pseudopotto: When is a potto not a potto?" (http://www.primate-

sg.org/PDF/AP3.1-2.pdf). African Primates 3 (1–2): 43–44.

Bearder, S. K. (1999). "Physical and social diversity among nocturnal primates: A new view based on longterm research". Primates 40: 267–282. doi:10.1007/BF02557715

(http://dx.doi.org/10.1007%2FBF02557715).

Bowden, C.G.R. (2001). "The birds of Mount Kupe, southwest Cameroon"

(http://malimbus.free.fr/articles/V23/23013044.pdf). Malimbus 23: 13–44.Groves, C.P. (1998). "Pseudopotto martini: a new potto?" (http://www.primate-sg.org/PDF/AP3.1-

2.pdf). African Primates 3 (1–2): 42–43.

Groves, C.P. (2005). "Order Primates". In Wilson, D.E.; Reeder, D.M. Mammal Species of the World: A

Taxonomic and Geographic Reference (3rd ed.). Baltimore, Maryland: The Johns Hopkins UniversityPress. pp. 111–184. ISBN 978-0-8018-8221-0.

Grubb, P.; Butynski, T.M.; Oates, J.F.; Bearder, S.K.; Disotell, T.R.; Groves, C.P.; Struhsaker, T.T.

(2003). "Assessment of the diversity of African primates". International Journal of Primatology 24 (6):1301–1357. doi:10.1023/B:IJOP.0000005994.86792.b9

(http://dx.doi.org/10.1023%2FB%3AIJOP.0000005994.86792.b9).



Holden, C. (ed.) (1996). "Our new relation". Science 271 (5253): 1235–1237.

doi:10.1126/science.271.5253.1235 (http://dx.doi.org/10.1126%2Fscience.271.5253.1235).

Leon, B.S. (2000). "A review of the validity of the new genus Pseudopotto (Schwartz, 1996)". AmericanJournal of Physical Anthropology. Suppl. 30: 209–210. doi:10.1002/(SICI)1096-8644(2000)111:30+

<199::AID-AJPA13>3.0.CO;2-M (http://dx.doi.org/10.1002%2F%28SICI%291096-

8644%282000%29111%3A30%2B%3C199%3A%3AAID-AJPA13%3E3.0.CO%3B2-M).

Leutwyler, K. (1996). "In brief". Scientific American 274 (4): 22–26. doi:10.1038/scientificamerican0496-22a (http://dx.doi.org/10.1038%2Fscientificamerican0496-22a).

Nowak, R.M. (1999). Walker's Mammals of the World (6th ed.). Baltimore, Maryland: Johns Hopkins

University Press. ISBN 0-8018-5789-9.Oates, J.F.; Butynski, T.M.; Kingdon, J.; Bearder, S.; Pimley, E.; De Jong, Y. (2008). "Perodicticus

potto" (http://www.iucnredlist.org/details/16629). IUCN Red List of Threatened Species. Version 2010.4.

International Union for Conservation of Nature. Retrieved May 18, 2011.

Sarmiento, E. (1998). "The validity of "Pseudopotto martini"" (http://www.primate-sg.org/PDF/AP3.1-2.pdf). African Primates 3 (1–2): 44–45.

Schwartz, J.H. (1996). "Pseudopotto martini: a new genus and species of extant lorisiform primate".

Anthropological Papers of the American Museum of Natural History 78: 1–14. hdl:2246/271(http://hdl.handle.net/2246%2F271).

Schwartz, J.H. (2005). "Considering prosimian diversity: why so many galagos and so few lorises?".

American Journal of Physical Anthropology. Suppl. 40: 185–186. doi:10.1002/ajpa.20217

(http://dx.doi.org/10.1002%2Fajpa.20217).Stump, D.P. (2005). Taxonomy of the genus Perodicticus (http://etd.library.pitt.edu/ETD/available/etd-

05312005-122303/) (PhD thesis). University of Pittsburgh. p. 199.

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Categories: Animals described in 1996 Lorises and galagos Mammals of Africa Monotypic mammal genera

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