INVESTIGADORES
MANZANO Adriana Silvina
artículos
Título:
Developmental basis of limb homology in Pleurodiran turtles and the identity of the hooked element in the chelonian tarsus
Autor/es:
M. FABREZI, A. S. MANZANO, V. ABDALA, AND H. ZAHER
Revista:
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
Editorial:
Blackwell Publishing
Referencias:
Lugar: Great Britain; Año: 2009 vol. 155 p. 845 - 866
ISSN:
0024-4082
Resumen:
Abstract: Although Pleurodiran turtles represent an important component of extant
turtle radiation, our knowledge of adult limb variation and homology in turtles rests
mostly upon observations made on derived members of the more diversified
Cryptodiran clade. Herein, we describe limb development in three pleurodirans:
Podocnemis unifilis, P. sextuberculata and Phrynops hilarii, as an effort to contribute in
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
, P. sextuberculata and Phrynops hilarii, as an effort to contribute in
filling this important anatomical gap. At earlier stages, we described the Y-shaped
condensation that gives rise to the zeugopodial cartilages, and differentiation of the
primary axis/digital arch that reveals the invariant pattern common to tetrapods. There
are up to four central cartilaginous foci in the carpus, and the proximal tarsal is formed
by the fusion of the fibulare, intermedium and Central 4. Digital development is similar
for the five digits. Changes in Toe V occur predominantly in the Distal Tarsal 5.
Ontogenetic reduction of phalanxes is observed in Toe V of Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.
Podocnemis. Based on
these results, we suggest that the hooked element present in the chelonian tarsus, and
traditionally recognized as a modified fifth metatarsal, is actually the fifth distal tarsal.
Additionally, our data on limb development of pleurodiran turtles supply more
taxonomically comprehensive information to interpret limb variation within the
chelonian clade.