Ctenophora Overview and Classifications

Study Notes

Ctenophora Overview

Belongs to the phylum Ctenophora, commonly known as comb jellies.
Recognized for unique anatomical features including colloblasts and ctenes.

Class Tentaculata, Order Lobata

Characterized by having 4 costae (longitudinal stripes).
Possess short tentacles and large oral lobes for feeding.

Class Tentaculata, Order Cydippida

Notable for long, retractable tentacles utilized primarily for capturing prey.

Class Tentaculata, Order Cestida

Features a flat, ribbon-like shape.
Equipped with short tentacles positioned along the edge.

Class Nuda, Order Beroida

Identified by 8 costae and lack of tentacles on oral lobes.
Body shapes vary from almond to long football and stumpy banana.

Defining Characteristics of Ctenophores

Have specialized cells called colloblasts important for catching prey.
Exclusively found in marine environments.
Possess rows of fused cilia known as ctenes, which aid in locomotion.
Body structure includes two layers of living tissue: endoderm and ectoderm.
Contains a gelatinous layer called mesoglea between the tissue layers.

Colloblasts

Cells that cover the outer layer of tentacles.
Play a critical role in the capture of prey through adhesive properties.

Statolith

An apical sense organ that helps in orientation.
Controls the movement of cilia for swimming and stabilization.

Description

Explore the fascinating phylum Ctenophora, also known as comb jellies. This quiz covers various classes and orders within Ctenophora, highlighting their unique anatomical features, feeding mechanisms, and environmental habitats. Test your knowledge on the distinct characteristics of these marine creatures.