Parasite

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Symbiosis is a dependent relationship between dissimilar organisms. Types of symbiosis include parasitism, mutualism, and commensalism. Although some would argue that "symbiosis" only refers to mutualism.

Parasitism

The relationship is harmful to one, but beneficial to the other.

• Interspatial parasite
• Tarchannen III species

Neural Paracites

→ See main article: Neural parasite

• Neural parasite (23rd century)
• Neural parasite (24th century)
• Xindi neural parasite

Social Parasitism

• TNG: "Symbiosis"

Parasitic behavior in non-organisms

• Nitrium parasite
• Silicon-based parasite

Mutualism

The relationship is mutually beneficial to both organisms.

• Trill Symbiont

Commensalism

One organism benefits from the relationship, the other is not affected.

• magnetic organism from TAS: "Beyond the farthest star"