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Exploring the Influence of Neomorphic Gekkotan Paraphalanges on Limb Modularity and Integration.
Fratani, Jessica; Fontanarrosa, Gabriela; Duport-Bru, Ana Sofía; Russell, Anthony.
Afiliación
  • Fratani J; Unidad Ejecutora Lillo (UEL), CONICET-Fundación Miguel Lillo, San Miguel, Tucumán, Argentina.
  • Fontanarrosa G; Instituto de Biodiversidad Neotropical (IBN), CONICET-UNT, Yerba Buena, Tucumán, Argentina.
  • Duport-Bru AS; Instituto de Biodiversidad Neotropical (IBN), CONICET-UNT, Yerba Buena, Tucumán, Argentina.
  • Russell A; Facultad de Ciencias Naturales e IML, Universidad Nacional de Tucumán, Tucumán, Argentina.
J Exp Zool B Mol Dev Evol ; 2024 Sep 02.
Article en En | MEDLINE | ID: mdl-39221754
ABSTRACT
Digital specializations of geckos are widely associated with their climbing abilities. A recurring feature that has independently emerged within the sister families Gekkonidae and Phyllodactylidae is the presence of neomorphic paraphalanges (PPEs), usually paired, paraxial skeletal structures lying adjacent to interphalangeal and metapodial-phalangeal joints. The incorporation of PPEs into gekkotan autopodia has the potential to modify the modularity and integration of the ancestral limb pattern by affecting information flow among skeletal limb parts. Here we explore the influence of PPEs on limb organization using anatomical networks. We modeled the fore- and hindlimbs in species ancestrally devoid of PPEs (Iguana iguana and Gekko gecko) and paraphalanx-bearing species (Hemidactylus mabouia and Uroplatus fimbriatus). To further clarify the impact of PPEs we also expunged PPEs from paraphalanx-bearing network models. We found that PPEs significantly increase modularity, giving rise to tightly integrated sub-modules along the digits, suggesting functional specialization. Species-specific singularities also emerged, such as the trade-off between the presence of PPEs favoring modularity (along the proximodistal axis) and the interdigital webbing favoring integration (across the lateromedial axis) in the limbs of U. fimbriatus. The PPEs are characterized by low connectivity compared with other skeletal elements; nevertheless, this varies based on their specific location and seemingly reflects developmental constraints. Our results also highlight the importance of the fifth metatarsal in generating a shift in lepidosaurian hindlimb polarity that contrasts with the more symmetrical bauplan of tetrapods. Our findings support extensive modification of the autopodial system in association with the addition of the neomorphic and intriguing PPEs.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Exp Zool B Mol Dev Evol Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Exp Zool B Mol Dev Evol Año: 2024 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Estados Unidos