Jamaican ibis

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Jamaican ibis
Temporal range: Early Holocene 0.01  Ma
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Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Pelecaniformes
Family: Threskiornithidae
Genus: Xenicibis
Olson & Steadman, 1977
Species:
X. xympithecus
Binomial name
Xenicibis xympithecus
Olson & Steadman, 1977
Jamaica range for Flightless Ibis.svg
Former range (in red)

The Jamaican ibis, Jamaican flightless ibis [1] or clubbed-wing ibis [2] (Xenicibis xympithecus) is an extinct bird species of the ibis subfamily uniquely characterized by its club-like wings. [3] It is the only species in the genus Xenicibis, [1] and one of only two flightless ibis genera, [2] [3] the other being the genus Apteribis which was endemic to Hawaii's islands of Maui Nui. [2] [4]

Contents

Description

The species was first described in 1977 based on postcranial bone elements excavated in a cave deposit at Long Mile Cave, Jamaica, by H. E. Anthony in 1919–20. [1] [5] At the time, it was presumed to be flightless based on the incomplete coracoid; [1] its flightlessness was confirmed after a humerus of the same species was found in the Swansea Cave, Jamaica. [5] [6] New fossil finds from two locations, including the Red Hills Fissure, show that the bird has a unique modification of the carpometacarpus, rendering it club-like. [3] The metacarpal is enlarged and bowed distally with thickened walls, while the ulna and radius have been modified as well. From its maximum femur diameter of 8.7 mm, it has been estimated that the Jamaican Ibis weighed about 2 kg (70 oz). [3]

Clubbed wing function

Ornithologists speculate that the wings were used as weapons, in the manner of a club or flail, [3] similar to the adaptations found in some mantis shrimps (Stomatopoda: Gonodactyloidea) that possess a club-like distally inflated dactyl used to strike prey and other shrimps. [7] Among birds, this adaption seems unique. [3] In birds, adaptations of the wing that are advantageous in the context of fighting represent an example of contingency in which species find different solutions to the same problem as a result of random variations. [3] [8]

Drawing of the wing bones of an American white ibis (left) and Jamaican ibis (right). Bones are scaled such that the humeri are the same size to enable easier comparison of morphological changes. Clubbed-wing-drawing.svg
Drawing of the wing bones of an American white ibis (left) and Jamaican ibis (right). Bones are scaled such that the humeri are the same size to enable easier comparison of morphological changes.

Distribution

Jamaica relief location map.jpg
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Long Mile Cave
Red pog.svg
Swansea Cave
Red pog.svg
Red Hills Fissure
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Jackson's Bay Cave
Excavation sites

The Jamaican ibis was endemic to Jamaica. Bones have been excavated from several caves, including the Long Mile Cave, [1] the Swansea Cave, [6] the Jackson's Bay Cave [9] and the Red Hills Fissure. [3] Bones from Cuba claimed to be of this genus [10] were later identified as those of a limpkin. Jamaica and Cuba have never been linked, so it is improbable that a flightless species could reach a different island. [5]

Related Research Articles

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<span class="mw-page-title-main">St. Croix macaw</span> Species of extinct macaw

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<i>Caracara</i> (genus) Genus of birds

Caracara is a genus in the family Falconidae and the subfamily Polyborinae. It contains one extant species, the crested caracara; and one extinct species, the Guadalupe caracara. The South American Classification Committee of the American Ornithological Society has voted to again merge the two, retaining C. plancus as crested caracara. The taxonomists of the International Ornithologists' Union have also merged them.

Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1985.

Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1977.

Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, cast-off parts, fossilised feces (coprolites), palynomorphs and chemical residues. Because humans have encountered fossils for millennia, paleontology has a long history both before and after becoming formalized as a science. This article records significant discoveries and events related to paleontology that occurred or were published in the year 1976.

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<i>Apteribis</i> Extinct genus of birds

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Swansea Cave is a cave and palaeontological site in the Saint Catherine Parish of south-eastern Jamaica.

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<span class="mw-page-title-main">Bermuda towhee</span> Extinct species of bird

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<i>Branta rhuax</i> Extinct species of goose

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The Bermuda flicker is an extinct woodpecker from the genus Colaptes. It was confined to Bermuda and is known only by fossil remains dated to the Late Pleistocene and the Holocene. However, an old travel report by explorer Captain John Smith from the 17th century may also refer to this species.

Oscar Paulino Arredondo de la Mata was a Cuban paleontologist. He described a number of birds and mammals of the Quaternary Period from fossils obtained from Cuban caves. He has been called the "father of Cuban vertebrate paleontology".

References

  1. 1 2 3 4 5 Olson, Storrs L; Steadman, David W (1977). "A new genus of flightless ibis (Threskiornithidae) and other fossil birds from cave deposits in Jamaica". Proceedings of the Biological Society of Washington. 90 (2): 447–457.
  2. 1 2 3 Tyrberg, Tommy (2009). "Holocene avian extinctions". In Turvey, Sam (ed.). Holocene Extinctions. Oxford University Press. pp. 63–106. ISBN   978-0-19-953509-5.
  3. 1 2 3 4 5 6 7 8 Longrich, N. R.; Olson, S. L. (2011). "The bizarre wing of the Jamaican flightless ibis Xenicibis xympithecus: a unique vertebrate adaptation". Proceedings of the Royal Society B: Biological Sciences. 278 (1716): 2333–2337. doi:10.1098/rspb.2010.2117. PMC   3119002 . PMID   21208965.
  4. Olson, Storrs L.; Wetmore, Alexander (1976). "Preliminary diagnoses of two extraordinary new genera of birds from Pleistocene deposits in Hawaiian Islands" (PDF). Proceedings of the Biological Society of Washington. 89: 247–258. Retrieved January 7, 2011.
  5. 1 2 3 Suárez, William (2001) "Deletion of the flightless ibis Xenicibis from the fossil record of Cuba" Archived 2011-10-01 at the Wayback Machine . Caribbean Journal of Science37 (12): 109110
  6. 1 2 Olson, Storrs L; Steadman, David W (1979). "The humerus of Xenicibis, the extinct flightless ibis of Jamaica". Proceedings of the Biological Society of Washington. 92: 23–27.
  7. Patek, S. N.; Korff, W. L.; Caldwell, R. L. (2004). "Biomechanics: Deadly strike mechanism of a mantis shrimp". Nature. 428 (6985): 819–20. Bibcode:2004Natur.428..819P. doi:10.1038/428819a. PMID   15103366. S2CID   263603633.
  8. Gould, Stephen J (1989). Wonderful Life: The Burgess Shale and the Nature of History . New York: W. W. Norton. pp.  347. ISBN   0-393-02705-8.
  9. McFarlane, D A; Lundberg, J; Fincham, A G (August 2002). "A late Quaternary paleoecological record from caves of southern Jamaica, West Indies" (PDF). Journal of Cave and Karst Studies. 64 (2): 117–125.
  10. Arredondo, Oscar (1984). "Sinopsis de las aves halladas en depósitos fosilíferos pleisto-holocénicos de Cuba". Reporte de Investigación del Instituto de Zoología (in Spanish). 17: 1–3.