syndactyl造句

• Birds'feet are classified as anisodactyl, zygodactyl, heterodactyl, syndactyl or pamprodactyl.
• :: It seems like the di-and tri-configurations are more rare, and that syndactyl, pamprodactyl and zygodactyl should perhaps be included.
• The western brush wallaby resembles peramelemorphs in having syndactyl second and third toes on the hind-foot, where the two small digits are fused together except at the tip, where a pair of slender claws protrudes.
• This would mean the incisors were homologous features, structurally the same but with a slightly different function ( as the carnivorous marsupials use them to rip through flesh ), and the syndactyl hind feet are analogous features, as they are used for the same basic function but are not evidence of divergent evolution.
• Attempts to resolve this puzzle include the view that the bandicoot group evolved from the carnivores, retaining the polyprotodont dentition, and independently evolving a syndactyl hind foot; the contrary view that syndactyly is so unusual that it is unlikely to have evolved twice and therefore the bandicoot group must have evolved from a possum-like diprotodont creature, and re-evolved its extra teeth.