platyctenea
Definition
Noun: - Platyctenea: An order of marine invertebrates within the class Tentaculata, phylum Ctenophora. These are the "flat comb jellies," characterized by their dorsoventrally flattened, often worm-like or creeping body forms, in contrast to the more typical spherical or ovoid shapes of other ctenophores. Many species lack the distinctive rows of ciliary combs (ctenes) as adults or have them reduced.
Usage Examples
- Noun:
- The biologist studied a member of the Platyctenea, noting its unusual flattened shape compared to other comb jellies.
- Platyctenea are unique among ctenophores for their benthic, creeping lifestyle on the sea floor.
Advanced Usage
- Taxonomic Context: The term is used primarily in scientific classification and marine biology texts. It is often preceded by the definite article "the" when referring to the entire order.
- The order Platyctenea contains families such as the Coeloplanidae and Ctenoplanidae.
Variants and Related Words
- Platyctenean (noun/adjective): A member of the order Platyctenea; pertaining to the Platyctenea.
- The platyctenean specimen was carefully collected from the reef.
Synonyms
- Flat comb jellies: A common descriptive name.
- Order Platyctenea: The full taxonomic designation.
Related Terms (Contextual)
- Tentaculata: The class to which the order Platyctenea belongs.
- Ctenophora: The phylum, commonly known as comb jellies.
- Benthic: Referring to the bottom of a body of water, describing the habitat of many platycteneans.
Noun
-
an order of Tentaculata
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