Fishes, seabirds and shore birds are the main predators of sand crabs. Because a barred surfperch's diet is 90% sand crabs, surf fishermen use sand crabs as bait. Commercial bait fisheries keep sand crabs that are in the soft-shelled stage, which occurs after a crab molts its old shell and before its new shell hardens.
https://www.montereybayaquarium.org/animal-guide/invertebrates/sand-crab
Yes, as a vertebra is a piece of a backbone. As such invertebrate  means an organism that does not have a spinal column or back bone.  Crabs have an exoskeleton (their exter…nal shell serves as a  skeleton) instead of a back bone, they are therefore considered  invertebrates.   Crabs have no bones, including no vertebrae (backbones).
http://www.answers.com/Q/Is_a_crab_an_invertebrate
crabs are inverterbrates because people eat them as crab not as a chicken wing.
http://www.answers.com/Q/Is_a_crab_an_invertebrate
On the following slides, you'll discover the 31 different groups, or phyla, of invertebrates, ranging from amoeba-like placozoans that stick to the sides of fish tanks to marine animals, like octopuses, that can achieve a near-vertebrate level of intelligence. Getty Images.
https://www.thoughtco.com/types-of-invertebrates-4106646
For other uses, see Octopus (disambiguation). The octopus (/ˈɒktəpʊs/ or /ˈɒktəpəs/) is a cephalopod mollusc of the order Octopoda. It has two eyes and four pairs of arms and, like other cephalopods, it is bilaterally symmetric. It has a beak, with its mouth at the center point of the arms.
https://en.wikipedia.org/wiki/Octopus
Insects are a type of invertebrate, meaning they don't have an internal skeleton or backbone. Insects are also a type of arthropod. The term arthropod comes from the Greek word meaning jointed feet, and includes other similar animals such as crustaceans and arachnids.
http://animalkingdom.net/category/invertebrates/
Animals can be classified based on their similarities. Continue on, and learn more about your fellow Earth inhabitants. Here are some of the animals you can investigate in our Science Reference Library. The first name you read is the common name for the animal. The name in parentheses ( ) is the Latin word for the group (the phylum or subphylum or class or group or order) that scientists sometimes use to refer to animals. Animals.
http://www.kidport.com/RefLIB/Science/Animals/Animals.htm
Crab Facts. Crab is an invertebrate that belongs to the crustacean family. There are over 4500 species of crabs and most of them live in the coastal areas of salty, fresh or brackish water (mix of fresh and salty water). Besides aquatic species, some crabs are semi-terrestrial or terrestrial (they live on the land).
http://www.softschools.com/facts/animals/crab_facts/127/
Echinoderms are a type of invertebrate found in marine or ocean environments. Common echinoderms include the sea star, sea urchin, sand dollar and sea cucumber. Most echinoderms have arms or spines that radiate from the center of their body. The central body contains their organs, such as mouth for … [Read more...]
http://animalkingdom.net/category/invertebrates/
Natural History. No bigger than a thumb, a sand crab spends most of its time buried in shifting sand. Well camouflaged by its gray shell, a sand crab keeps its balance in the ever-moving sand with the help of a heavily armored, curved body and pointy legs. To stay put in the sand, a crab burrows quickly and often.
https://www.montereybayaquarium.org/animal-guide/invertebrates/sand-crab
what sort of invertebrate is a crab
Crab is the crustacean family invertebrate. Crab is from the crustacean family of invertebrate. Crab is crustacean family sort of invertebrate.