Marijuana Pest and Disease Control by Ed Rosenthal

Author:Ed Rosenthal [Rosenthal, Ed]
Language: eng
Format: epub
Publisher: Quick Trading Company

Pacific banana slug (Agriolimax columbianus)

BIOLOGY

Snails and slugs are closely related. Both are mollusks and both are members of the order Gastropoda, from the Greek gaster for belly and pous for foot. Gastropods are the largest groups of mollusks with more than 40,000 species, comprising more than 78 percent of all mollusks. Snails and slugs are the only mollusks found on land, but they are also found in both fresh and salt water. Most slugs and land snails belong to the informal group Pulmonata, meaning that they utilize lungs instead of gills to draw oxygen from the air.

The lung, or pulmonary cavity, lies on the inside of the roof of the visceral sac. Snails and slugs take oxygen into their bodies through their breathing pore, or the pneumostome. When this pore is open, the top and the bottom of the lung are close together. The bottom drops, increasing the volume in this sac, and oxygen flows into the lung. Then, the pneumostome closes and the bottom goes up again, pushing oxygen into the body.

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