| 31. | It lives among the external gills of its neotenous host, only occasionally straying from this hiding place during darkness.
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| 32. | Damselfly nymphs breathe through external gills on the abdomen, while dragonfly nymphs respire through an organ in their rectum.
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| 33. | The embryos develop a placenta after around four months of gestation, when they still possess vestiges of external gills.
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| 34. | Branchiosaurids like " Branchiosaurus " and " Apateon " are represented by many fossils preserving skin and external gills.
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| 35. | Their fully aquatic larvae are branchiate, with three pairs of external gills behind their heads and above their gill slits.
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| 36. | At an embryonic length of, the external gills have all but disappeared, and a covering of small denticles is present.
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| 37. | Instead of internal gills, they develop three feathery external gills that grow from the outer surface of the gill arches.
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| 38. | The tadpoles, which resemble fish fry but are distinguished by their feathery external gills, hatch out in about three weeks.
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| 39. | All the amphibians that returned permanently to the water developed external gills, feathery tissue that extends out from the body.
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| 40. | It is one to two inches long, with a slender body and external gills, and is a reddish-brown in color.
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