What type of symmetry does a brittle star have?
What type of symmetry does a brittle star have?
radial symmetry
Brittle stars belong to Class Ophiuroidea (Phylum Echinodermata) and have radial symmetry, with five elongate, skinny arms extending from their central disc, or body.
What is the difference between a brittle star and a basket star?
Brittle stars usually have 5, but may have up to 10 arms. Basket stars have 5 arms that branch into many slender, highly mobile arms. The arms are covered with calcite plates or thick skin.
What is the group of brittle stars and basket stars?
Ophiuroids are a large group (over 1600 species) of echinoderms that includes the brittle stars (Ophiurida) and basket stars (Euryalida).
What happens when the arms of a sea star are joined together?
5. What happens when the arms of a sea star are joined together? It makes the basic shape of a sea urchin.
What type of symmetry does a brittle star have quizlet?
What type of symmetry does a Brittle Star have? Radial, but can move like they are bi-laterally symmetrical. They are also considered pentraradial because they can be carved into halves in 5 different ways.
What are the characteristics of a brittle star?
brittle star, also called serpent star, any of the 2,100 living species of marine invertebrates constituting the subclass Ophiuroidea (phylum Echinodermata). Their long, thin arms—usually five and often forked and spiny—are distinctly set off from the small disk-shaped body.
How are basket stars and brittle stars similar?
Brittle and basket stars are sea animals that have long, thin, flexible arms. The bottom of the arms is covered with sucking tube feet. The arms of brittle stars are easily broken. The arms of both types of stars have a skeleton that looks like a string of small bones.
What class is a basket star?
Brittle starsBasket stars / Class
What happens when you cut off a starfish’s arm?
“As long as the lost limb has at least some of the central disc area it can develop into a second starfish. “At the same time the original starfish will also be able to grow a new leg. The whole process can take up to a year or more but we have already noticed the severed leg is beginning to develop,” she added.
Do starfishes have brains?
They have no brain or blood! However, they find very clever and simple ways to get around it. Seawater is pumped throughout their body as a replacement for blood, with the water delivering key nutrients to the starfish allowing its organs to function properly.
