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Haemadipsa zeylanica, a terrestrial leech Placobdelloides siamensis, a parasite of turtles in Thailand.The ventral face (right) shows many young leeches. [3]Some 680 species of leech have been described, of which around 100 are marine, 480 freshwater and the remainder terrestrial.
Description English: Leech in cross-section. Whereas other annelids are largely hollow, with a spacious coelom, leeches are largely solid, filled with dermis, and the coelom reduced to channels.
The annelids (/ ˈ æ n ə l ɪ d z /), also known as the segmented worms, are animals that comprise the phylum Annelida (/ ə ˈ n ɛ l ɪ d ə /; from Latin anellus 'little ring'). [3] [a] The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches.
Hirudo medicinalis, or the European medicinal leech, is one of several species of leeches used as medicinal leeches. Other species of Hirudo sometimes also used as medicinal leeches include H. orientalis , H. troctina , and H. verbana .
Hirudinaria [1] is a genus of large Asian leeches belonging to the family Cylicobdellidae; [2] previously it was placed in the Hirudinidae. [3] [a] It includes species such as H. manillensis that may be called "Asian medicinal leeches", but together with the genus Poecilobdella, they are also described as Asian buffalo leeches.
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.
During a blood meal, a leech rhythmically contracts its muscles to draw blood from a host animal into the crop for storage. It can consume over five times its own weight in blood in one feeding. Once satiated, a leech detaches from its host. Hirudo verbana uses anticoagulants when it feeds, so its bite wounds continue bleeding for some time ...
The leech sometimes emerges from the water to hunt for earthworms. [4] [7] Like other leeches, Haemopis sanguisuga is a hermaphrodite. The testes mature first and the ovaries later in the organism's life. A pair of leeches will line up with the clitellar regions in contact, and sperm is passes by the one acting as male to the female gonopore.