Definition

Noun: 1. A genus of crinoids: Genus Ptilocrinus is the scientific name for a specific group of marine animals known as crinoids, commonly called sea lilies. This genus is characterized by its feathery, stalked structure and is part of the class Crinoidea.

Usage Notes

• This term is a scientific, taxonomic name used in biology and paleontology. It is always written in italics, with the genus name () capitalized.
• It is used in formal, academic, or scientific contexts to precisely identify and classify these organisms.

Examples of Usage

• Scientific Description:
  • Fossil evidence suggests that genus Ptilocrinus was widespread during the Paleozoic era.
  • The researcher identified the new specimen as belonging to genus Ptilocrinus based on its distinctive calyx structure.
• Comparative Context:
  • Unlike free-swimming crinoids, members of genus Ptilocrinus are primarily sessile, anchored to the sea floor by a stalk.

Advanced Usage

• In Taxonomic Hierarchy: The term is used to denote a rank above species and below family. For example: "The family Hyocrinidae includes genus Ptilocrinus and several other related genera."

Variants and Related Words

• Ptilocrinus (n): The abbreviated form of the genus name, used after the full name has been introduced. (e.g., " species exhibit a range of stalk lengths.")
• Crinoid (n): The common name for the class of echinoderms to which this genus belongs.
• Sea lily (n): The common name for stalked crinoids, which includes members of .

Synonyms

• Sea lily genus (This is a descriptive synonym, not a formal taxonomic one.)

Related Terms (Scientific Context)

• Echinoderm (n): The phylum of marine animals that includes crinoids, sea stars, and sea urchins.
• Sessile (adj): Describes an organism that is fixed in one place and not free-moving, a characteristic of stalked crinoids like .
• Calyx (n): The cup-shaped structure that contains the main body and feeding arms of a crinoid.

Noun

1. sea lilies