noun
firebrat
A small, fast-moving insect (Thermobia domestica) often found in warm places like kitchens and bakeries. The name is usually written in katakana.
マダラシミは高温多湿の場所を好む。
Firebrats prefer hot and humid places.
パン屋でマダラシミを見つけた。
I found a firebrat in the bakery.
シミ (silverfish) is a related but different insect; マダラシミ is specifically the firebrat, which prefers warmer environments.
The name マダラシミ combines 斑 (まだら, 'mottled') and 紙魚 (しみ, 'silverfish'), referring to its mottled appearance and its relation to the silverfish family.