Megamouth shark "M. applegatei" – have also recently been proposed on the basis of fossilized tooth remains. However, the Cretaceous-aged "M. comanchensis" has been recently reclassified as an odontaspid shark in the genus "Pseudomegachasma", and is in fact unrelated to the megamouth shark despite similar teeth morphology. The appearance of the megamouth is distinctive, but little else is known about it. It has a brownish-black colour on top, is white underneath, and has an asymmetrical tail with a long upper lobe, similar to that of the thresher shark. The interior of its gill slits are lined with finger-like gill rakers that capture
Paradise fish predators, eating insects, invertebrates, and fish fry. The popularity of this species has waned in recent decades as much more colorful (and often less pugnacious) species of gouramis have become widely available to hobbyists. This species is one of the few fish that can change its color (lighter or darker) in response to stimuli. It also appears that paradise fish are capable of learning through a type of restrictive process. Most forms of active teaching seem to hinder the paradise fish's ability to learn. Paradise fish are tolerant of a wide range of water conditions, surviving in cool and warm