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I thought the ultimate parental care in anurans was by Nectophrynoides liberiensis and N. occidentalis in which the eggs are retained until they hatch and are then subsequently fed via oviductal secretions.

Obligate egg feeding does not look to be that rare and has evolved in a number of genera.

Ed
 

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There is at least one frog that has obligate egg eating tadpoles that doesn't exhibit the complexity of care that obligate egg feeding Dendrobatids demonstrate. Female Osteocephalus oophagus returns in amplexus to the same bromeliad as the first egg clutch was deposited and deposits clutches of eggs at 5 day intervals. The tads are kept in groups and apparently only one deposition site is used by the female. Each tadpole can swallow and slowly digest over 100 eggs.

Ed (grins)
 
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