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Thysanozoon nigropapillosum is a species of polyclad flatworms belonging to the family Pseudocerotidae. Some common names include Gold-speckled flatworm, Marine flatworm, Yellow papillae flatworm, Yellow-spotted flatworm, and Yellow-spotted polyclad flatworm.
Like other members of the genus Pseudobiceros, P. hancockanus is hermaphroditic with each individual able to function as either a male or female. Mating between two such worms involves penis fencing, as each worm tries to inject sperm into the other with one of its two stubby penises, while trying to avoid being inseminated itself.
Pseudocerotidae is a family of flatworms which includes the Bedford's flatworm. Pseudocerotidae are simple organisms categorized by their oval bodies and tentacles [7] and bright colors. They use the cilia to glide along surfaces. [8] Most commonly referred to as marine flatworms, closely related to the orders Macrostomorpha and Lecithoepitheliata.
The etymology of the order name Polycladida corresponds to the two ancient Greek words πολύς (polús), meaning "numerous", and κλάδος (kládos), meaning "branch". [3] [4] It refers to the ramified shape of the intestine in these flatworms. [5] Most polyclads hide away from direct light.
Adults usually have two holdfasts: a ring around the mouth and a larger sucker midway along what would be the underside in a free-living flatworm. [5] Although the name "Digeneans" means "two generations", most have very complex life cycles with up to seven stages, depending on what combinations of environments the early stages encounter ...
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