parmarion martensi slug crawling on the leafy ground

air animal antenna ariophantidae breathing brown climb crawl creature dark detail environment eyes forest garden gastropoda gray grey ground gummy head helicarionoidea horn invertebrate isolated land martensi mollusca mollusk moving nature ostracolethinae outdoor parasite parmarion path pest plant pulmonate semislug shell shelled slug snail soft sticky tentacle terrestrial wet wildlife worm yellow