earthworm excretions close up, nephridia coelom by a ciliated funnel, nephrostome, micronephridia and mesonephridia next to tree

earthworm excretions nephridia coelom ciliated funnel nephrostome micronephridia mesonephridia bark beetle infested tree galleries dieback tracks wood beetles single dead trees forest environment damage gallery sapwood scolytinae barkbeetle phloem deforestation species environmental decline destroyed ecological elm egg larvae pupae adult mountain pine pollution natural spruce ecology fungi europe nature close next