Macrognatus in a hole. A macrognatus
      hides under green leaf

Macrognatus looks out of ground
What?

Macrognatus in a hole

A macrognatus hides in a hole under a green leaf. Such a scene you may see if there are sea shells or coconut shells or so near the front glass of your aquarium. All fish, which like holes (catfish, loaches), gather under those shells.