Bilateral Polydactyly in a foal

Carstanjen, Bianca; Abitbol, Marie; Desbois, Christophe

doi:10.4142/jvs.2007.8.2.201

Cited by 17 publications

(24 citation statements)

References 5 publications

(8 reference statements)

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“…Better examples in the equidae are polydactylous horses, not those with a cleft of the 3rd toe (the present hoof) but those with more or less well-developed 2nd and 4th digits [from the medial and lateral splint bones [Dyce et al, 2002;Stanek and Hantak, 1986;Carstanjen et al, 2007]. Legend holds that the horse of Alexander the Great (Bucephalus, "Oxhead") and that of Julius Caesar (Fig.…”

Section: Historicalmentioning

confidence: 99%

“…2 (3-toed), strain D (good 4-toed), of F 1 (3-toed), of F 2 , and of 1st, 2nd, 3rd, and 4th [Romer, 2, Romer, 1945;MacFadden, 1992;Strickberger et al, 4, 2008]. d: "Modern" horse, Equus caballus, redrawn from Owen [1849]; left: polydactylous horse, redrawn from various sources [Stanek and Hantak, 1986;MacFadden, 1992;Carstanjen et al, 2007]. 3: large metacarpal (cannon) bone; 2, 4: Small metacarpal (splint) bone-former digits 2 and 4. a-c: Redrawn from several sources [Romer, 1945;Cihak et al, 1992;MacFadden, 1992;Hall and Hallgrímsson, 2008].…”

Section: Guinea Pigsmentioning

confidence: 99%

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Annals of morphology. Atavisms: Phylogenetic lazarus?

Zanni

Opitz

2013

American J of Med Genetics Pt A

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Dedication: with highest respect and affection to Prof. Giovanni Neri on the eve of his official administrative retirement as Chair of the Institute of Medical Genetics of the Università Cattolica of Rome for leadership in medical genetics and medical science and friendship for decades. The concept “atavism,” reversion, throwback, Rückschlag remains an epistemological challenge in biology; unwise or implausible over‐interpretation of a given structure as such has led some to almost total skepticism as to its existence. Originating in botany in the 18th century it became applied to zoology (and humans) with increasing frequency over the last two centuries such that the very concept became widely discredited. Presently, atavisms have acquired a new life and reconsideration given certain reasonable criteria, including: Homology of structure of the postulated atavism to that of ancestral fossils or collateral species with plausible soft tissue reconstructions taking into account relationships of parts, obvious sites of origin and insertion of muscles, vascular channels, etc. Most parsimonious, plausible phylogenetic assumptions. Evident rudimentary or vestigial anatomical state in prior generations or in morphogenesis of a given organism. Developmental instability in prior generations, that is, some closely related species facultatively with or without the trait. Genetic identity or phylogenomic similarity inferred in ancestors and corroborated in more or less closely related species. Fluctuating asymmetry may be the basis for the striking evolutionary diversification and common atavisms in limbs; however, strong selection and developmental constraints would make atavisms in, for example, cardiac or CNS development less likely.Thus, purported atavisms must be examined critically in light of the above criteria. © 2013 Wiley Periodicals, Inc.

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Section: Historicalmentioning

confidence: 99%

Section: Guinea Pigsmentioning

confidence: 99%

Annals of morphology. Atavisms: Phylogenetic lazarus?

Zanni

Opitz

2013

American J of Med Genetics Pt A

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“…Im Vergleich zu anderen beschriebenen Fällen (Weinhart und Gotz 1996, Carstanjen et al 2007 (Budras und Röck 1996, Reinhard 1997, Christman 2008. Hornsäulen können durch Druck zu einer Hufbeinatrophie und zu Lahmheit führen (Reinhard 1997, Christman 2008.…”

Section: Diskussionunclassified

“…Sie tritt sowohl beim Menschen (Mumoli et al 2008) als auch bei verschiedenen Hautierarten wie Katze (Sis und Getty 1968), Hund (Park et al 2008), Rind (Bahr et al 2003) und Pferd (Crow 1985, Stanek und Hantak 1986, Dore 1989, Weinhart und Gotz 1996, Bowling und Milion 1990, Carstanjen et al 2007 auf. Beim Pferd, dessen Akropodium aus einem einzigen Strahl besteht, das aber aus Vorfahren, die drei oder vier Zehen besaßen, hervorgegangen ist, soll in bestimmten Fäl-len das Vorkommen polydaktyler (mehrfingeriger) Akren auf diese Abstammung zurückzuführen sein (Boas 1917, Hall 1995.…”

unclassified

“…Allerdings kann es wie beim Menschen und anderen Haustieren auch beim Pferd durch Teilung der Bildungsanlagen zur zahlenmäßigen Vermehrung von Zehen kommen (Schistodaktylie). Hiervon sind allerdings in der Regel alle Fingerknochen betroffen, während die Griffelbeine meistens normal ausgebildet sind (Stanek und Hantak 1986, Carstanjen 2007. Eine atavistische Polydaktylie kann dann ausgeschlossen werden, wenn sie nicht vom distalen Ende des medialen und/oder lateralen Griffelbeins ausgeht (Boas 1917;Stanek und Hantak 1986).…”

unclassified

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Polydaktylia - In remembrance to Eurohippus messelensis – a case report

Wolff¹,

Lühken²,

Litzke³

2009

PHK

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Polydaktylia -In remembrance to Eurohippus messelensis -a case reportPolydactilia occurs seldom but is a prime example for atavisms and therefore a sign of gradual evolutionary change. The difference between poly-and schistodactyly, the features of atavistic polydactyly as well as possible causes are addressed. A following case study is about a 3 weeks old female Icelandic foal with a congenital malformation of the right front leg. Radiographic examination revealed a completely developed MC II including formation of proximal, middle and distal phalanges. In the area of the coronary groove the hoof was grown together. The supernumerary digit was amputated. Surgical approach and postoperative management is explained. Finally the discussion deals with the prognosis which was good in the present case, although the accretion was a possible complication.

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Extreme bilateral polydactyly in a wild‐caught western grey kangaroo

Warburton¹,

Cake

Kelman

2020

The Anatomical Record

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Polydactyly is a congenital malformation resulting from an autosomal dominant mutation manifesting as supernumerary digits of the hands or feet. It is most commonly reported in humans and domestic mammals, though there have also been isolated examples across a range of wild vertebrate species.Here we report a case of extremely unusual bilateral preaxial polydactyly on the pectoral limbs of a male western grey kangaroo (Macropus fuliginosus) from the South West region of Western Australia, in which two supernumerary digits were present on each manus. A supernumerary digit I on each manus was rudimentary in morphology without extrinsic muscular connections. However, supernumerary digit II present on each manus had fully developed extrinsic and intrinsic muscular connections, suggesting that these digits possessed normal function in flexion and extension. An alternative hypothesis is that the two supernumerary digits are both representatives of the most radial digit I, though this would then require the true digit I to have taken on the appearance of digit II by acquiring an additional phalanx and modified muscular attachments. The carpal bones exhibited a number of subtle differences in morphology when compared to normal pentadactyl individuals. The presence of a distal, rather than proximal, epiphysis on the first metacarpal was unexpected but further investigation suggested that this characteristic is perhaps more variable (in this species at least) than has been previously recognized.This case provides an unusual example to be considered within the broader context of limb development.

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Bilateral Polydactyly in a foal

Cited by 17 publications

References 5 publications

Annals of morphology. Atavisms: Phylogenetic lazarus?

Annals of morphology. Atavisms: Phylogenetic lazarus?

Polydaktylia - In remembrance to Eurohippus messelensis – a case report

Extreme bilateral polydactyly in a wild‐caught western grey kangaroo

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