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Invertebrate palaeontology; Invertebrate palæontology; Invertebrate Paleontology; Invertebrate fossils

Marine invertebrates         
INVERTEBRATE THAT PARTIALLY OR WHOLLY INHABITS MARINE HABITATS
Marine invertebrate; Marine invertabrates; Aquatic invertebrate; Evolution of marine invertebrates
Marine invertebrates are the invertebrates that live in marine habitats. Invertebrate is a blanket term that includes all animals apart from the vertebrate members of the chordate phylum.
Invertebrata         
ANIMAL WITHOUT A VERTEBRAL COLUMN
Invertebrates; Macroinvertebrate; Macroinvertebrates; Invertebrata; Evertebrata; Invertebrate hormones; Microinvertebrate; Invertabrate; Non-vertibrate; Acraniata; Non-vertebrate; Invertebrate faunas; Invertebrate fauna; Lower animals
·noun ·pl A comprehensive division of the animal kingdom, including all except the Vertebrata.
invertebrate         
ANIMAL WITHOUT A VERTEBRAL COLUMN
Invertebrates; Macroinvertebrate; Macroinvertebrates; Invertebrata; Evertebrata; Invertebrate hormones; Microinvertebrate; Invertabrate; Non-vertibrate; Acraniata; Non-vertebrate; Invertebrate faunas; Invertebrate fauna; Lower animals
(invertebrates)
An invertebrate is a creature that does not have a spine, for example an insect, a worm, or an octopus. (TECHNICAL)
N-COUNT
Invertebrate is also an adjective.
...invertebrate creatures.
ADJ

Βικιπαίδεια

Invertebrate paleontology

Invertebrate paleontology (also spelled invertebrate palaeontology) is sometimes described as invertebrate paleozoology or invertebrate paleobiology. Whether it is considered to be a subfield of paleontology, paleozoology, or paleobiology, this discipline is the scientific study of prehistoric invertebrates by analyzing invertebrate fossils in the geologic record.

By invertebrates are meant the non-vertebrate creatures of the kingdom Animalia (or Metazoa) in the biotic domain of Eukaryota. By phyletic definition, these many-celled, sub-vertebrate animals lack a vertebral column, spinal column, vertebrae, backbone, or long, full-length notochord—in contrast to the vertebrates in the one phylum of Chordata.

Relatedly, invertebrates have never had a cartilaginous or boney internal skeleton, with its skeletal supports, gill slits, ribs and jaws. Finally, throughout geologic time, invertebrates have remained non-craniate creatures; that is, they never developed a cranium, nerve-chord brain, skull, or hard protective braincase (unlike many vertebrates).