genus hydra
Definition
Noun: 1. A taxonomic genus of small, freshwater organisms: "Genus Hydra" is the scientific name for a genus of simple, predatory animals belonging to the phylum Cnidaria. They are characterized by a tubular, radially symmetric body with a mouth surrounded by tentacles containing stinging cells (cnidocytes).
Usage Notes
- "Genus Hydra" is a formal, scientific term used primarily in biological and zoological contexts. The common name for members of this genus is simply "hydra."
- It is always capitalized when referring to the taxonomic rank ("Genus Hydra"), as is standard for genus names in binomial nomenclature.
- The plural form is "genera Hydra" or, more commonly in general writing, "hydras."
Examples of Usage
- Noun:
- The simple nervous system of Genus Hydra is a classic subject for biological study.
- Under the microscope, we observed a specimen belonging to Genus Hydra.
- Members of Genus Hydra are known for their remarkable regenerative abilities.
Advanced Usage
- In Taxonomic Hierarchy: The term is used to specify the genus level within the scientific classification: Kingdom Animalia > Phylum Cnidaria > Class Hydrozoa > Order Anthoathecata > Family Hydridae > Genus Hydra.
- In Research Contexts: Often used in scientific papers to distinguish these specific organisms from other genera within the same family or from mythological references.
Variants and Related Words
- hydra (n.): The common name for any organism within Genus Hydra.
- We found a hydra attached to a leaf in the pond.
- Hydridae (n.): The biological family to which Genus Hydra belongs.
- Cnidarian (n./adj.): Referring to the broader phylum (Cnidaria) that includes hydras, jellyfish, and corals.
Synonyms
- hydra (when used as the common name for the organism)
Notes on Different Meanings
- Mythology: The term "Hydra" (capitalized) most famously refers to the many-headed serpent from Greek mythology that grew two heads for each one cut off. This is a completely separate concept from the biological Genus Hydra.
- Figurative Use: "Hydra" can be used metaphorically to describe a problem that seems to multiply or become more complex when one part of it is solved (e.g., "The corruption scandal was a hydra with new revelations every day"). This usage stems from the mythological creature, not the biological genus.
Noun
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hydras
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