 The juvenile was more slender than the adult, but shared the same distinctive pleated gills.As the holotype was a gravid female, the spongehead catshark is likely oviparous.The spongehead catshark belongs to the "A. spongiceps" species group, characterized by a short, wide snout, seven to 12 valves in the spiral intestine, the upper labial furrows subequal to or shorter than the lower furrows, and a continuous supraorbital sensory canal.