What Is Inside The Earthworms Intestine - The Earth Images Revimage. Posts about earthworm written by sir albertus Labeled sketch of an earthworm. Earthworms are examples of non chordates, that live within burrows of composting, moist soil. As members of Phylum Annelida, earthworms have bilateral (bi = two, later = the side) symmetry and a “tube-within-a-tube” body plan. The typhlosole in earthworms increases the surface area of the intestine for efficient secretion and absorption during digestion. They seem like creepy bottom-dwellers, but without worms, the soil would not be fertile for vegetation. These organisms live in and feed off a living host, like a human. The typhlosole, thus, hangs in the lumen of intestine and runs mid-dorsally from 26th segment up to the last except posterior 24, 25 segments. Earthworms See more. Although, not normally a subject I would draw, earthworms have become curious creatures to me. The intestinal lining is folded to form villi, one of these villi becomes larger and well developed than the others to form the typhlosole. Open Versus Closed Circulatory System: Dissection of the Crayfish and Earthworm. The lining of intestine has ciliated and glandular cells. It is named for the Greek word for "blind pipe," and the typhlosole can be defined as an extra flap of tissue or an infolding along the inner wall of the intestine. Pheretima posthuma, the common species of earthworms, is usually given to kids for their biology experiments while studying the anatomy of an earthworm.. Earthworm Biology. I've been collecting worms for fishing and composting. Biology Lessons Teaching Biology Science Biology Science Lessons Life Science Earth Science High School Biology High School Science Ganglion Parasitic worms in humans are often associated with travel, but you can also get them at home. Background — Earthworms: In this lab, you will become familiar with the external and internal anatomy of the earthworm, Lumbricus terrestris. The earthworm biology basically consists of an elongated, cylindrical body that is metamerically segmented. See more