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Lab Exam Review - Earthworm Chart.docx
Lab Exam Review - Earthworm Chart.docx

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McGill University
Biology (Sci)
BIOL 111
Suzanne Gray

Organism Phylum Annelida  Earthworms Brief  Daytime, remain underground to avoid drying out Description  Nighttime, come above ground to search for food and to mate  Thin transparent cuticle secreted by the epidermis to protect the worm External  Mucus is also secreted from the glandular cells, aids in protection, Anatomy locomotion as well as respiration  The anterior end is thicker than the posterior end  The Clitellum is a thick band around the worm, found closer to the anterior end  The ventral side is flatter and lighter than the dorsal side  Respiratory, digestive, circulatory and nervous systems are found in the anterior end  Earth worm is divided into segments (each segment contains four pairs of setae (bristle like projections that aid in anchoring the worm to the substrate)  Segment 1: the mouth; thin ventral slit  contains the peristomium (fleshy lobe that surrounds the mouth and the protosmium (fleshly lobe that proceeds the mouth)  Segment 9 to 10: contains the seminal receptacles, where the sperm is stored  Segment 14: two female genital pores, where the egg is released  Segment 15: two male genital pores, where the sperm is released  Segment 26: genital setae is found here, secrete a sticky mucus-like substance that allows the worms to stay together when undergoing copulation  Segment 32-37: clitellum is found here, secretes a mucus cocoon in which the sperm and egg are deposited  Last segment: the anus is found here  Move via the use of longitudinal and circular muscles (shortening and Movement lengthening) 1. Circular muscles contract 2. Putting pressure on the fluid in the coelom 3. Causes the worm to elongate 4. Longitudinal muscles contract 5. Causes the worm to shorten 6. Setae keep the worm anchored to the ground during this movement  Egg is produced in the ovaries and travels through the oviduct to the Reproduction female genital pore where the egg is then released  Sperm is produced in the semical vessels and travels through the vas deferens to the male genital pore wher
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