Passer predomesticus

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Passer predomesticus
Temporal range:
Middle Pleistocene
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Passeridae
Genus: Passer
Species:
P. predomesticus
Binomial name
Passer predomesticus
Tchernov, 1962

Passer predomesticus is a

Middle Pleistocene layer of the Oumm-Qatafa cave in Palestine. The premaxillaries resemble those of the house and Spanish sparrows, but differ in having a deep groove instead of a crest on the lower side. Israeli palaeontologist Eitan Tchernov, who described the species, and others have considered it to be close to the ancestor of the house and Spanish sparrows, but molecular data point to an earlier origin of modern sparrow species. Occurring in a climate Tchernov described as similar to but rainier than that in Palestine today, it was considered by Tchernov as a "wild" ancestor of the modern sparrows which have a commensal
association with humans, although its presence in Oumm-Qatafa cave may indicate that it was associated with humans.

Taxonomy

A male and female Spanish sparrow, a close relative of P. predomesticus, in southeastern Turkey

The known material of Passer predomesticus consists of two

The Auk, to contain "many troublesome lapses and contradictions".[3] In 1975, French palaeontologist Cécile Mourer-Chauviré reported on fossil sparrows from a cave at Saint-Estève-Janson in southeastern France, which could not be identified as either P. predomesticus or the house sparrow (Passer domesticus). Because no premaxillae were found, the bones could not be distinguished from those of the house sparrow.[4]

Tchernov argued that the house sparrow and related species have undergone considerable

Palaearctic Passer species evolved later.[8] Drawing on more recent studies of molecular data, Ted R. Anderson stated in his 2006 Biology of the Ubiquitous House Sparrow that all Passer species have a long evolutionary history, with speciation possibly occurring as early as the Miocene.[9]

Description

Diagram of the skull of a house sparrow seen from below, with the premaxilla (marked pmx) at top

Premaxillae, the only bones from which Passer predomesticus is known, are generally relatively easy to identify to species in birds. Tchernov found that the two premaxillae of P. predomesticus most closely resembled the house and Spanish sparrows, but were distinct from either. In P. predomesticus, there is a central, longitudinal groove with raised margins running along the lower (ventral) side of the premaxilla. In contrast, the house and Spanish sparrows have a narrow crest in this position, which is more prominent in the house sparrow.[1][2] In the great sparrow, Cape sparrow (Passer melanurus), and southern grey-headed sparrow (Passer diffusus), this crest is more poorly developed, and they may even have a shallow groove at the front of the premaxilla, not nearly as well-developed as the groove in P. predomesticus. In P. predomesticus, the premaxilla has a maximum width of 8.0 millimetres (0.31 in) and the length from the tip of the premaxilla to the back of the nasal bones is 12.0 millimetres (0.47 in).[1][2]

Distribution

According to Tchernov's 1962 paper, Passer predomesticus was found in the middle

Yabrudian.[6] Layer E1 contained remains of about 40 bird species, including a premaxilla Tchernov described as a precursor of the Dead Sea sparrow (Passer moabiticus) and a tarsometatarsus and humerus tentatively allied with the house sparrow.[11] An undetermined Acheulean layer of the same cave also contained fossils Tchernov described as precursors of both the house and Spanish sparrows.[8]

Although interpretations of the palaeoclimate at Oumm-Qatafa have differed, Tchernov suggested that the deposits are from a

References

  1. ^ a b c Tchernov 1962, pp. 102–103
  2. ^ .
  3. ^ Woolfenden 1965, p. 680
  4. ^ Mourer-Chauviré 1975, p. 212
  5. ^ Tchernov 1962, p. 103
  6. ^ a b c Tchernov 1984, pp. 94–95
  7. ^ a b Johnston & Klitz 1977, pp. 18–19
  8. ^ a b Summers-Smith 1988, pp. 278–279
  9. ^ a b Anderson 2006, pp. 9–10
  10. ^ Tchernov 1962, pp. 99–100
  11. ^ Tchernov 1962, pp. 100, 103–104
  12. ^ Tchernov 1962, p. 121

Works cited