four pairs-each body segment except the first and last. SAVE CANCEL. already exists as an alternate of this question. An earthworm consists of a digestive tube housed within a thick cylindrical muscular tube that forms the body. already exists. Would you like to make it the primary and merge this question into it? First of all, not every earthworm segment bears sex organs. From here the sperm pass through sperm ducts to two male genital openings on the bottom of segment 15. Counting from the front, the worm's male sex cells lie in segments 10 and 11. The body is divided into segments, and furrows on the surface of the body mark the division between each segment. A general description of earthworm ecology and anatomy. MERGE CANCEL. The earthworm had many segments which is a special adaptation that they from BIOL 106 at St Bonaventure University Reproductive: Since Earthworms are hermaphrodites, they have both female and male reproductive organs. The earthworm's intestine begins to increase the surface area to increase nutrient absorption by have many folds running along its length. TUBES-that they can retreat into if they get scared. how many segments does an earthworm have - Biology - TopperLearning.com Would you like to merge this question into it? It varies with the species. Who many eyes does an earthworm have? The sexual organs are located around segments 9 … The first segment encloses the mouth, and has a fleshy, muscular lobe on the top. There are around 2,200 earthworm species and some have over one hundred segments. Earthworms are animals in the phylum Annelida, along with leeches. 2) earthworm begins to back up 3) when mucus passes over female genital pore (14), eggs go out of the ovary and into the mucus 4) mucus passes over seminal receptacle (9-10), sperm from other earthworm is placed on eggs 5) once earthworm has backed completely out of the mucus, the mucus encloses eggs and they will fertilize in that cocoon ... what do marine worms have around their bodies. The fossil is not only the oldest evidence of the earthworm’s existence, but it also marks it as earth’s oldest multi-celled animal. ... 1. tube-shaped bodies divided into many segments 2. a body cavity with organs 3. two body opening-mouth and anus. The name comes from Latin anellus for “little ring,” a reference to the many segments of their bodies. Earthworm structure. How many sets of setae does the earthworm have. The common American and European earthworm, Lumbricus terrestris, has about 150 segments.. MERGE CANCEL.