crystalline style

Invertebrates are animals that lack a backbone, making up over 90% of all known animal species. They exhibit vast diversity, including creatures like sponges, jellyfish, insects, and mollusks.1

A crystalline style is a rod-like structure found in the digestive tract of many bivalve mollusks. This translucent, gelatinous body aids in digestion by secreting enzymes and churning food particles. It is a key component of the digestive system in these animals.23

In contrast, invertebrate anatomy is incredibly varied, as these animals are classified into more than 30 distinct phyla, unlike the single phylum that encompasses all vertebrates. While some invertebrates possess hard outer skeletons, such as crustaceans and insects, they generally lack the rigid internal skeleton found in vertebrates.1