What are two characteristics of crustaceans?
- A hard exoskeleton made of calcium - no internal skeleton.
- The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.
- A pair of green glands excrete wastes near the base of antennae.
- The abdominal segments have swimmerets (swimming legs)
Moreover, what characteristics make crustaceans different from other arthropods?
Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by their larval forms, such as the nauplius stage of branchiopods and copepods.
Likewise, how do crustaceans begin life? At its most complete, a crustacean's life cycle begins with an egg, which is usually fertilised, but may instead be produced by parthenogenesis. This egg hatches into a pre-larva or pre-zoea. Some crustaceans continue to moult as adults, while for others, the development of gonads signals the final moult.
Herein, what is the same about all crustaceans?
These invertebrates include crabs, barnacles, KRILL, and woodlice. They are sometimes called the insects of the sea, because they are the most numerous ocean arthropods. All crustaceans have hard skin, gills, and two pairs of antennae.
What type of mouthparts do crustaceans have?
In general, however, crustaceans possess paired mandibles with opposing biting and grinding surfaces. The mandibles are followed by paired first and second maxillae. Both the mandibles and the maxillae have been variously modified in different crustacean groups for filter feeding with the use of setae.