False potto

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False potto
Scientific classification OOjs UI icon edit-ltr.svg
(disputed)
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Strepsirrhini
Family: Lorisidae
Subfamily: Perodicticinae
Genus: Pseudopotto
Schwartz, 1996
Species:
P. martini
Binomial name
Pseudopotto martini
Schwartz, 1996

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

Contents

The false potto generally resembles a small potto, but according to Schwartz it differs in having a longer tail, shorter spines on its neck and chest vertebrae, a smaller, less complex spine on the second neck vertebra, an entepicondylar foramen (an opening in the humerus, or upper arm bone), a lacrimal fossa (a depression in the skull) that is located inside the eye socket, a smaller upper third premolar and molar, and higher-crowned cheekteeth, among other traits. However, many of these traits are variable among pottos; for example, one researcher found entepicondylar foramina in almost half of the specimens in his sample of pottos.

Taxonomy

In a series of potto (Perodicticus potto) skeletons in the collections of the Anthropological Institute and Museum of the University of Zurich at Irchel, anthropologist Jeffrey H. Schwartz recognized two specimens with traits he believed 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 generic name, Pseudopotto, combines the element pseudo- (Greek for "false") with "potto", referring to superficial similarities between the new form and the potto. [2] The specific name, martini, honors primatologist Robert D. Martin. [3] The exact provenance of the two specimens is unknown, and one is represented by a complete skeleton (but no skin) and the other by a skull only. [4] Schwartz placed both specimens in a single species, but noted that further study might indicate that the two represent distinct species. [5] He thought the relationships of the new form were unknown and difficult 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. [6] The discovery, published in the Anthropological Papers of the American Museum of Natural History, was featured in Scientific American [7] and Science ; the Science account noted that Schwartz thought Pseudopotto may represent a new family of primates. [8]

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 [9] and Simon Bearder cited it as an example of unrecognized taxonomic diversity in lorisids, [10] but Esteban Sarmiento compared the new taxon to specimens of the potto and found 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. [11] In 2000, primatologist B.S. Leon agreed that the false potto was not distinct from the subspecies Perodicticus potto potto, but noted that various forms of potto were distinct enough from each other that there may indeed be more than one species of potto. [12] 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, [13] the primate chapter of the 2005 third edition of Mammal Species of the World , written by Groves, listed Pseudopotto as a genus but noted that it was "controversial"; [14] and Schwartz continued to recognize the false potto as a genus in 2005. [15] Also in 2005, primatologist David Stump reviewed some of the distinguishing features of Pseudopotto in the context of studying variation 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). [16]

Description

The potto (genus Perodicticus, pictured) is quite similar to the false potto and may represent the same species. PottoCincyZoo.jpg
The potto (genus Perodicticus, pictured) is quite similar to the false potto and may represent the same species.

One of the specimens, AMZ 6698, is an adult female that lived in Zürich Zoo. It is represented by a virtually complete skeleton, but the skin was not preserved. According to Schwartz, the skeleton shows signs of osteoporosis and periodontitis (common in zoo animals), but not of other pathologies or abnormalities. The right teeth were removed before Schwartz studied the specimen. [4] Schwartz selected this specimen as the holotype. [2] The other specimen, AMZ-AS 1730, is a subadult male collected in the wild, of which only the skull, including the mandible (lower jaw), was preserved. The dentition includes both permanent and deciduous teeth. [4] Specimens of Pseudopotto are at least superficially similar to pottos, [17] but according to Schwartz, they differ in a number of traits. Among lorisids, Schwartz saw similarities between the false potto and true pottos as well as angwantibos and slow lorises (Nycticebus). [5] 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. [12]

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. [9] 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. [12] Schwartz writes that the false potto differs 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, [5] which Groves suggests may indicate that the wrist is more mobile. [9] 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. [5]

Other distinguishing features of the false potto are in the dentition. Sarmiento notes, however, that captive specimens 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. [12] The third upper premolar (P3) is also reduced, resembling the condition in the fork-marked lemurs (Phaner). [5] 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. [9] The lower premolars are compressed laterally in Pseudopotto, the cusps on the cheekteeth are higher, and the cristid obliqua (a crest connected to the protoconid cusp) is at a relatively buccal position (in the direction of the cheeks). [5]

In AMZ 6698, skull length is 59.30 mm (2.335 in) and length of the right humerus is 57.65 mm (2.270 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". [4] According to mammalogist Ronald Nowak, these designations 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 (2,690 to 3,084 ft) on Mount Kupe had been reported, surveys had failed to confirm its occurrence there, though pottos, some with long tails, had been found. The false potto was formerly included under the potto in the Red List, however, as of October 2021, it is treated as a synonym of the Central African potto (Perodictitus edwardsi) due to the evidence that it is a distinct species being considered insufficient. The American Society of Mammalogists instead synonymizes it with the West African potto (P. potto). [33] [34]

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<span class="mw-page-title-main">Lorisidae</span> Family of primates

Lorisidae is a family of strepsirrhine primates. The lorisids are all slim arboreal animals and comprise the lorises, pottos and angwantibos. Lorisids live in tropical, central Africa as well as in south and southeast Asia.

<span class="mw-page-title-main">Perodicticinae</span> Subfamily of primates

Perodicticinae is a subfamily of the family Lorisidae. It includes five species of African primates as shown under taxonomy below.

<span class="mw-page-title-main">Strepsirrhini</span> Suborder of primates

Strepsirrhini or Strepsirhini is a suborder of primates that includes the lemuriform primates, which consist of the lemurs of Madagascar, galagos ("bushbabies") and pottos from Africa, and the lorises from India and southeast Asia. Collectively they are referred to as strepsirrhines. Also belonging to the suborder are the extinct adapiform primates which thrived during the Eocene in Europe, North America, and Asia, but disappeared from most of the Northern Hemisphere as the climate cooled. Adapiforms are sometimes referred to as being "lemur-like", although the diversity of both lemurs and adapiforms does not support this comparison.

<span class="mw-page-title-main">Angwantibo</span> Genus of primates

Angwantibos are two species of strepsirrhine primates classified in the genus Arctocebus of the family Lorisidae. They are also known as golden pottos because of their yellow or golden coloration.

<span class="mw-page-title-main">Potto</span> Arboreal primate of west-central Africa

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<span class="mw-page-title-main">Slow loris</span> Genus of primates from Southeast Asia

Slow lorises are a group of several species of nocturnal strepsirrhine primates that make up the genus Nycticebus. Found in Southeast Asia and bordering areas, they range from Bangladesh and Northeast India in the west to the Sulu Archipelago in the Philippines in the east, and from Yunnan province in China in the north to the island of Java in the south. Although many previous classifications recognized as few as a single all-inclusive species, there are now at least eight that are considered valid: the Sunda slow loris (N. coucang), Bengal slow loris (N. bengalensis), Javan slow loris (N. javanicus), Philippine slow loris (N. menagensis), Bangka slow loris (N. bancanus), Bornean slow loris (N. borneanus), Kayan River slow loris (N. kayan) and Sumatran slow loris. A ninth species, the pygmy slow loris (X. pygmaeus), was recently moved to the new genus Xanthonycticebus. After the pygmy slow loris, the group's closest relatives are the slender lorises of southern India and Sri Lanka. Their next closest relatives are the African lorisids, the pottos, false pottos, and angwantibos. They are less closely related to the remaining lorisoids, and more distantly to the lemurs of Madagascar. Their evolutionary history is uncertain since their fossil record is patchy and molecular clock studies have given inconsistent results.

<span class="mw-page-title-main">Lorisoidea</span> Superfamily of primates

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<span class="mw-page-title-main">Calabar angwantibo</span> Species of mammal

The Calabar angwantibo, also known as the Calabar potto, is a strepsirrhine primate of the family Lorisidae. It shares the genus Arctocebus with the golden angwantibo. It is closely related to the potto and to the various lorises.

<span class="mw-page-title-main">Pygmy slow loris</span> Species of primate

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<span class="mw-page-title-main">Bioko Allen's bushbaby</span> Species of primate

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<span class="mw-page-title-main">West African potto</span> Species of primate

The West African potto is a species of nocturnal strepsirrhine primate. It is found in tropical West Africa. It is also known as Bosman's potto, after Willem Bosman, who described the species in 1704. It is the type species of the genus Perodicticus.

<span class="mw-page-title-main">Central African potto</span> Species of primate

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References

  1. ↑ Schwartz 1996, pp. 2, 8.
  2. 1 2 Schwartz 1996, p. 8.
  3. ↑ Schwartz 1996, p. 9.
  4. 1 2 3 4 Schwartz 1996, p. 2.
  5. 1 2 3 4 5 6 Schwartz 1996, p. 10.
  6. ↑ Schwartz 1996, pp. 8, 10, 12.
  7. ↑ Leutwyler 1996.
  8. ↑ Holden 1996.
  9. 1 2 3 4 Groves 1998, p. 42.
  10. ↑ Bearder 1998, p. 43.
  11. ↑ Sarmiento 1998, p. 45.
  12. 1 2 3 4 Leon 2000, p. 210.
  13. ↑ Grubb et al. 2003, p. 1323.
  14. ↑ Groves 2005, p. 123.
  15. ↑ Schwartz 2005, p. 185.
  16. ↑ Stump 2005, pp. 177–178.
  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. 1 2 3 Sarmiento 1998, p. 44.
  22. ↑ Leon 2000, p. 210; Stump 2005, p. 177.
  23. 1 2 3 Stump 2005, p. 177.
  24. ↑ Schwartz 1996, pp. 10–11, fig. 3.
  25. 1 2 3 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. ↑ Svensson et al. 2020.
  34. ↑ "Perodicticus potto (P. L. S. Müller, 1766)". ASM Mammal Diversity Database. American Society of Mammalogists . Retrieved 2021-11-08.

Literature cited

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