As with other classes, Hexactinellids are classified due to their spicules. Instead of the chemical composition of their spicules, they are diversified for the structure and application of the spicules. The name "Hexactinellida" was selected for the artifice of the fact that the spicules are six-rayed. Taxonomically, Hexactinellids have been subjected to as much theory in classification as the other members of the phylum. In fact, a multitude of scientists now profess that Hexactinellids should be designated to an entirely different phylum, denominated as "Symplasma." Currently, this theory not completely confirmed, the class is divided into the subclasses Amphidiscophora and Hexasterophora. Amphidiscophora is subsequently divided into the orders known as Amphidiscosida, which is extremely recent, and Hemidiscosida. Hexasterophoras are delineated amongst the orders Hexatinosida, Lychnicosida, and Lyassacinosida.

If this class of porifera was to be classified for its beauty, all would be compliant with the fact they are the most numinous and beautiful of all the porifera. Being deep sea dwellers, their climate is frigid and dark. However, their silica forms penetrate through the darkness in a dazzling array. Each silica spicules contains six rays, but it may be attached to other spicules or simply an individual structure. All of these structures are very elaborate. These integral features characteristic of most Hexactinellids have earned it the name "glass sponges." To remain attached to the ocean substratum, the Hexasterophoras and the Amphidiscophoras implement different means. Hexasterophoras adhere themselves to a firm substratum, or base. However, Amphidiscophoras apply tufts or single-rayed spicules, generating a base that is sufficiently less secure.

One very prominent division of Hexactinellids is Euplectella, more commonly known as Venus' Flower Basket. It is predominately located at a depth of 1500 feet (500 meters) from the ocean surface. In its structure, a rigid "skeleton" is evident. This composition, frequently attributed to Hexactinellids, helped to preserve the dimensions of its ancestors in the form of fossils. Despite a diminished quantity of modern species, Hexactinellids have maintained complex fossil records in geologic history. Their body composition and that of other porifera was the fundamental bedrock for the developments of many other animal species. By comprehending the fossil records of porifera, we may hope to better understand other organisms. In addition to their aesthetic appeal, Hexactinellids possess an extensive history. Their history has enhanced their diversification in features from other classes of porifera since the Precambrian. Such history also suggests why the theory of Hexactinellids being a separate phylum has eventuated. Hexactinellids, having originated in the Late Proterozoic, are the earliest animals still existent. Their geographic originations traced to China. As most porifera demonstrated diversity in the Cretaceous, such is true of the Hexactinellids. While certain classifications were predestined to extinction (such as Reticulosa), they provide the means for other distinct classes to develop. Amazingly, Hexactinellids have survived and prosper longer than a plethora of other animals, despite their rudimental composition. However, evolution is theorized to have occurred where Hexactinellids were able to live in shallow waters during various geologic periods.

Recent studies indicate that Hexactinellids should be compiled into an entirely new phylum known as Symplasma. Of all the porifera, calcarea and demosponges demonstrate the most plausible similarities. However, Hexactinellids are rather distinct from these two fundamental classes. Unlike other sponges, their spicules are supplemented with special electronic "receivers" that respond extremely rapidly to stimuli. The effects are generated across the body. Analytical fossil research suggest that hexactinellids are more ancient than other porifera. In addition, their body structures are composed of different substances. Tissues are primarily comprised of a primitive liquid, or cytoplasm, known as syncitia. In addition, while other sponges may alter their structure, hexactinellids are incapable of contracting and constricting their bodies. What does this mean? Is it a doorway to an entirely new field of study? Is it a window to our past? Only in demystifying the perplexities of the past may be hope to discover our future.