As I have mentioned previously, ecological segregation and interspecific competition probably is highly developed in the tadpoles of Ptychohyla.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
The continual humid conditions and abundance of insect food throughout the year in the cloud forest are perhaps indicative of little interspecific competition among adults of Ptychohyla and other sympatric hylids.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
Interfamilial Differences As shown above, there is a high degree of individual variation in the vessels being considered, while at the same time, few interspecific differences were noted within the families.
"Thoracic and Coracoid Arteries In Two Families of Birds, Columbidae and Hirundinidae"
Marion Anne Jenkinson