Ethan Walker 
Cephalopods move in several very different ways. Squid can combine pulsed jets with fin motions, cuttlefish can hover and maneuver with broad fins, octopuses often crawl across the seafloor with flexible arms, and nautiluses use a funnel-driven jet while their chambered shells help support buoyancy. Jet propulsion is one of the group’s signature abilities, but … Read more
Cephalopod anatomy is built around a striking rearrangement of the basic mollusk body plan. Octopuses, squid, cuttlefish, vampire squid, and nautiluses all belong to Cephalopoda, yet their bodies are not simply variations on one identical template. A mantle encloses major organs, a mantle cavity handles water flow across the gills, a muscular funnel directs expelled … Read more
The main living types of cephalopods are often introduced as octopuses, squid, cuttlefish, and nautiluses. That is useful for everyday identification, but it is not a precise map of their evolutionary relationships. Modern classification divides living Cephalopoda first into two major lineages, Nautiloidea and Coleoidea. Coleoidea then contains Octopodiformes, which includes octopuses and vampire squid, … Read more
A cephalopod is a specialized marine mollusk in the class Cephalopoda. Living cephalopods include nautiluses, octopuses, vampire squid, squid, cuttlefish, and several less familiar lineages. What makes them cephalopods is not one feature such as having eight arms, lacking a shell, or changing color. Instead, they share a distinctive body plan built around a prominent … Read more
Cephalopods are marine mollusks that include octopuses, squid, cuttlefish, nautiluses, and several less familiar relatives. They share a body plan built around a prominent head, a mantle, a muscular funnel, and appendages arranged around the mouth, but the living groups differ dramatically in shells, movement, senses, life history, and behavior. The modern class Cephalopoda includes … Read more
Myriapods matter because they occupy several different positions in terrestrial food webs. Centipedes are predators of small animals. Many millipedes process leaf litter, fungi, and other organic material. Pauropods interact with fungi, roots, and detritus at a microscopic scale. Symphylans can feed on decaying matter and living roots. All four classes can also become prey … Read more
Myriapods are fundamentally terrestrial animals. Centipedes, millipedes, pauropods, and symphylans live mainly in soil, leaf litter, rotting wood, bark crevices, caves, grasslands, gardens, and other land-based microhabitats. Many species favor places that stay humid and shaded, but the group is not restricted to wet forests. Myriapods also occur in deserts, mountains, coastal habitats, agricultural soils, … Read more
Myriapods survive close to the ground by solving a set of recurring problems: finding food in cluttered habitats, avoiding water loss, moving through narrow spaces, and escaping predators. Centipedes, millipedes, pauropods, and symphylans approach those problems differently. Centipedes often rely on active predation, venom, speed, and shelter. Many millipedes combine armor, coiling, chemical secretions, and … Read more
Myriapod reproduction begins with mating or sperm transfer, but development after hatching is where the group becomes especially interesting. Centipedes, millipedes, pauropods, and symphylans all grow by molting, yet they do not all add body segments or legs in the same way. Some hatch with fewer leg-bearing segments than they will have as adults. Others … Read more
Myriapods do not all eat the same kind of food. Centipedes are primarily predators that capture other animals. Many millipedes feed on decaying plant material, fungi, and microbe-rich litter. Pauropods are tiny soil animals that appear to feed mainly on fungi, detritus, and other microscopic resources. Symphylans can consume decaying organic matter as well as … Read more
