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Leeches either have a pharynx that they can protrude, commonly called a proboscis, or a pharynx that they cannot protrude, which in some groups is armed with jaws. [38] In the proboscisless leeches, the jaws (if any) of Arhynchobdellids are at the front of the mouth, and have three blades set at an angle to each other.
These leeches have five pairs of eyes, with the last two separated by two eyeless segments. The family is monotypic , containing only the subfamily Haemadipsinae , though as the family can apparently be divided into two or three distinct lineages, at least one of the proposed splits , while not a distinct family, might be a valid subfamily.
As in other species of leech, a cocoon is secreted by the clitellum, a thickened glandular section of the body wall behind the head, and this moves forwards over the head, receiving fertilised eggs from the gonopore on the way. [5] In some areas, Erpobdella obscura has a semelparous life history, i.e., the leech dies after reproduction.
Leeches, order Hirudinida, [4] mostly have flattened bodies, usually tapered at both ends. They have a fixed number of segments, 33, but the segmentation is not visible externally because the cuticle is marked with annulations. Leeches do not bear chaetae. The front few segments or head have been modified into a sucker that usually surrounds ...
Wheaton says the leeches were created two different ways: For long shots, they used skateboard grip tape, and for the closeups used a combination of latex, blood makeup and rubber cement.
Aquatic leeches have been found on sites such as the nose, mouth, pharynx, larynx, conjunctiva, trachea, bronchi, esophagus, vagina, bladder, rectum, and the creases of the eyes, [4] Although most instances were found in the nasopharynx, lower airways, or upper esophagus. Humans become victims from bathing or drinking unfiltered water in less ...
Each segment of the leech's body (and all leeches have 32) has three or four annuli. [2] [3]: 236 They are large leeches; one species, Pontobdella novaezealandiae, can grow as long as 20 centimetres. [3]: 236 [4]
The leeches end up washed down a shower drain, where they grow to enormous size and return for more feedings. Following the deaths of several members of the team and a college administrator, the few surviving team members and one of their girlfriends hatch a plan to kill off the monster leeches.