What is a cydippid larva?
A cydippid larva is the free-swimming, planktonic larval form of some Ctenophores. from Barnes, R. D. 1980. Invertebrate Zoology.
What are the characteristics of ctenophores?
Ctenophores are free-swimming, transparent, jelly-like, soft-bodied, marine animals having biradial symmetry, comb-like ciliary plates for locomotion, the lasso cells but nematocytes are wanting. They are also known as sea walnuts or comb jellies.
What is Paedogenesis example?
Examples include the long necks of giraffes for feeding in the tops of trees, the streamlined bodies of aquatic fish and mammals, the light bones of flying birds and mammals, and the long daggerlike canine teeth of carnivores.
What is brachiolaria larva?
A brachiolaria is the second stage of larval development in many starfishes. It follows the bipinnaria. Brachiolaria have bilateral symmetry, unlike the adult starfish, which have a pentaradial symmetry.
Are ctenophores jellyfish?
In a word, NO. Ctenophores and medusae are both planktonic, carnivorous, often transparent and tentacle bearing, animals, whose bodies are largely composed of water. They are often found together in the sea and some authors including me sometimes loosely refer to both as “jellies” or even “jellyfish”.
Why are comb jellies not jellyfish?
Many comb jellies have a single pair of tentacles (often each tentacle is branched, giving the illusion of many tentacles) that they use like fishing lines to catch prey. They are armed with sticky cells (colloblasts) and unlike jellyfish, the tentacles of comb jellies don’t sting.
How do ctenophores move?
Ctenophores move through the water by beating their comb rows — they are the largest animals to move entirely by ciliary movements — but they also have a complex array of definitive muscle cells.
Which animal is a cnidarian?
cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
What insect exhibits paedogenesis?
Paedogenesis is the reproduction by larvae or juveniles. In insects this form of reproduction is known from one beetle, several species of gall midges and possibly Erisalis hoverfiies.
What is the classification of Cydippida?
Cydippida is an order of comb jellies. There are 73 species of Cydippida, in 25 genera and 11 families. It includes groups like Bathyctenidae, Lampeidae, and Cryptocodidae. They have sexual reproduction.
What are the characteristics of cydippids?
Some species of cydippids have bodies that are flattened to various extents, so that they are wider in the plane of the tentacles. The tentacles are typically fringed with tentilla (“little tentacles”), although a few genera have simple tentacles without these side-branches.
What is a Cydippida jelly?
Cydippida is an order of comb jellies. They are distinguished from other comb jellies by their spherical or oval bodies, and the fact their tentacles are branched, and can be retracted into pouches on either side of the pharynx. The order is not monophyletic, that is, more than one common ancestor is believed to exist.
Is the cydippid order monophyletic?
The order is not monophyletic, that is, more than one common ancestor is believed to exist. Cydippids have bodies that are more or less rounded, sometimes nearly spherical and other times more cylindrical or egg-shaped; the common coastal “sea gooseberry,” Pleurobrachia, has an egg-shaped body with the mouth at the narrow end.