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Chordate and non-chordate characters
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Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them?The sea horse ($Hippocampus$) and the flying fish ($Exocoetus$) are both bony fishes (Osteichthyes), and all fishes are cold blooded (poikilothermal). The pair is correctly matched.
$Pteropus$ (flying fox) is a viviparous mammal, but $Ornithorhynchus$ (platypus) is an egg-laying (oviparous) mammal.
The garden lizard has a three-chambered heart, but the crocodile has a four-chambered heart.
$Ascaris$ and $Ancylostoma$ are roundworms (Aschelminthes), which are unsegmented; metameric segmentation is seen in annelids.
Hence the similar pair is the sea horse and the flying fish, both cold blooded.