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Well-represented in both freshwater and marine fossils since the Devonian, they are now represented by only two extant marine species in the genus Latimeria: the West Indian Ocean coelacanth (Latimeria chalumnae), primarily found near the Comoro Islands off the east coast of Africa, and the Indonesian coelacanth (Latimeria menadoensis). [4]
Bones from sea mammals and fish occur in La Jollan middens, but they are not abundant. Fish remains usually represent near-shore species, pointing to a littoral rather than maritime economy. The La Jolla complex was initially characterized as the Shell Midden people by Malcolm J. Rogers , the region's pioneering archaeologist.
Synonyms. Placodermata. Placoderms (from Greek πλάξ ( plax, plakos) ' plate ' and δέρμα ( derma) 'skin') [ 1] are vertebrate animals of the class Placodermi, an extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian periods. While their endoskeletons are mainly cartilaginous, their head and ...
Dunkleosteus. Dunkleosteus is an extinct genus of large arthrodire ("jointed-neck") fish that existed during the Late Devonian period, about 382–358 million years ago. It was a pelagic fish inhabiting open waters, and one of the first apex predators of any ecosystem. [ 1]
The San Diego Formation Basin is a confined shallow aquifer. It has a basin ground surface area of 79,724 acres (32,263 ha) and an estimated groundwater storage capacity of 960,000 AF. The depth to groundwater is about 100 feet (30 m). [ 3] The groundwater in the San Diego Formation is brackish, and its quality is considered to be fair to poor ...
In 1970, the City of San Diego incorporated the San Diego-La Jolla Underwater Park as part of a city-operated park that stretched more than 2-miles offshore. Responsibility for maintenance was to be shared by the City of San Diego's Department of Parks and Recreation and the California Department of Fish and Game. A 514-acre ecological reserve ...
The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fish lineages belong to the Agnatha, or jawless fish. Early examples include Haikouichthys.
Timeline of fish evolution. The evolution of fishes took place over a timeline which spans the Cambrian to the Cenozoic, including during that time in particular the Devonian, which has been dubbed the "age of fishes" for the many changes during that period. The Late Devonian extinctions played a crucial role in shaping the evolution of fish ...