![]() ![]() Helobdella stagnalis Linnaeus, 1758 and Helobdella triserialis Blanchard, 1849 ) attach cocoons directly to the venter of the parent, and monogeneric Theromyzinae (a unique genus, i.e. Glossiphonia complanata Linnaeus, 1758 ) attach cocoons to substrates, Haementeriinae (i.e. Īccording to Kutschera and Wirtz (2001), the Glossiphoniidae family can be divided into three subfamilies based on cocoon attachments: Glossiphoniinae (i.e. The parent usually covers the cocoons under its body for protection and provision of food for the developing larvae. Then, thin-walled cocoons, which consist of large yolk-filled eggs, are created. During their reproductive activities, individuals seize a partner with their anterior portions and the two leeches exchange pseudospermatophores, which appear to release spermatozoa on the surface of their bodies. Glossiphoniid leeches are easily bred in laboratory conditions and exhibit parental care behavior, which is probably de novo in this family. Because Leeches are only models, they are not affected by the console command notarget in Half-Life 2.Historically, glossiphoniid leeches have been favored over European medicinal leeches ( Hirudo medicinalis Linnaeus, 1758) for the study of animal development.It can be encountered underwater in " d2_coast_02", among others, in the playable Half-Life 2 Beta, although it is only heard, not seen, before the player dies. The Ichthyosaur was originally intended to fulfill the role of keeping the player from venturing too far into the ocean.In Half-Life 2, they are not even scripted entities, yet areas infested with them will deplete the player's health in a matter of seconds. In Half-Life, Leeches are minor enemies that do not cause much damage and can be easily killed.He also states they ate all the crabs, and seagulls keep their populations down. Since ocean fish are now very rare or extinct, the human occupants of coastal areas seem to catch and eat Leeches instead. Furthermore, the Fisherman reveals that Leeches are used as food. In Lost Coast, Leeches behave like in Half-Life 2. Here the eye count is brought to only two. In Half-Life 2, they attack Gordon Freeman in a swarm (an attack similar to that of the terrestrial piranha) if he ventures too far into the ocean, to prevent the player from venturing to the "end" of the map and force them to follow the proper path (much like the chopper in the video game Far Cry, for instance). In addition to being teleported to Earth, they are kept in the Black Mesa Biodome Complex for study. Leeches make their first appearance in Half-Life in some of the flooded sections of the Black Mesa Research Facility after the Resonance Cascade. ![]() Leeches in an aquarium in the Biodome Complex. While leeches are commonly seen in freshwater bodies, the Ichthyosaur also seems to occupy similar habitats, possibly showing non hostile coexistence between Xen fauna. Despite this, statements made by the fisherman say that Earth creatures such as seagulls have turned to hunting them, as it is stated that they keep their numbers down (as there may not be much for the seagulls and other predators of the leeches to eat in the first place due to the leeches themselves). ![]() Some Earth creatures remain in inland bodies of water, where insects and frogs can be heard, meaning that Leeches were either completely absent or did not fully eliminate them. Indeed they are the only creatures commonly seen in water bodies (in Half-Life 2, Leeches are only observed in oceans), though it is said that some creatures may remain, mostly crabs, which instead suffered from heavy population losses. They seem to have successful in establishing themselves, to the point that they may have caused the extinction most, if not all, of freshwater and marine fauna. They are usually white (sometimes pink or yellow) in color.ĭuring the Resonance Cascade, Leeches were teleported to Earth, infesting freshwater and saltwater bodies. They also resemble lampreys, hagfish, and candirus, and are similar to those animals in ecological niche as well. Leeches appear as small, agnathan like creatures that resemble leeches, specifically the terrestrial medicinal leeches. ![]()
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