Colossendeidae is a family of sea spider (class Pycnogonida). Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Subregnum Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Classes Arachnida - spiders, scorpions, etc. ... Families may not be a complete list: Ammotheidae Austrodecidae Callipallenidae Colossendeidae Nymphonidae Phoxichilidiidae Pycnogonidae Rhynchothoracidae Endeididae Sea spiders, also called Pantopoda or pycnogonids, are marine arthropods of class Pycnogonida. ... See genus (mathematics) for the use of the term in mathematics. ... A family of Ouagadougou, Burkina Faso in 1997 A family is a domestic group of people, or a number of domestic groups linked through descent (demonstrated or stipulated) from a common ancestor, marriage or adoption. ... Families may not be a complete list: Ammotheidae Austrodecidae Callipallenidae Colossendeidae Nymphonidae Phoxichilidiidae Pycnogonidae Rhynchothoracidae Endeididae Sea spiders, also called Pantopoda or pycnogonids, are marine arthropods of class Pycnogonida. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Families may not be a complete list: Ammotheidae Austrodecidae Callipallenidae Colossendeidae Nymphonidae Phoxichilidiidae Pycnogonidae Rhynchothoracidae Endeididae Sea spiders, also called Pantopoda or pycnogonids, are marine arthropods of class Pycnogonida. ...