Demosponge
Videos
Demosponges or common sponges are sponges of the class Demospongiae, the most diverse group in the phylum Porifera which include greater than 90% of all extant sponges with nearly 8,800 species worldw
The carnivorous ping-pong tree sponge, Chondrocladia lampadiglobus
Monanchora arbuscula (Poecilosclerida)
Geodia barretti (Tetractinellida)
Endoskeleton
Videos
An endoskeleton is a structural frame — usually composed of mineralized tissue — on the inside of an animal, overlaid by soft tissues. Endoskeletons serve as structural support against gravity and mec
Endoskeleton of a swordfish
A human skeleton on display at Booth Museum of Natural History
Fossilized skeleton of various dinosaurs
The skeleton of a kitefin shark, a cartilaginous fish