May 30, 2021 - SuperMag

Phylum-Hemichordata

May 30, 2021March 11, 2023 pcsclasses

Phylum-Hemichordata These are recently added as a phylum under non-chordates, earlier these were considered as a sub-phylum under the phylum chordates. They possess a rudimentary structure in the collar region known as a stomochord, which is similar to a notochord in structure. The hemichordates are marine deuterostome animals, generally considered the sister group of echinoderms. They appeared in the lower middle of the Cambrian. Scientific classification of phylum hemichordate Scientific classification of phylum hemichordata Kingdom: Animalia Subkingdom: Eumetazoa Clade: ParaHoxozoa Clade: Bilateria Clade: Nephrozoa Superphylum: Deuterostomia Clade: Ambulacraria Phylum: Hemichordata…

Phylum-Echinodermata

May 30, 2021March 31, 2023 pcsclasses

Phylum-Echinodermata The members of Phylum Echinodermata are exclusively marine animals, till now these are not found as terrestrial or freshwater. About seven thousand living species are included in this phylum. The adults are recognizable by their radial symmetry. The Phylum includes starfish, sea urchins, sand dollars, and sea cucumbers, as well as sea lilies or “stone lilies. The Echinoderms are the largest phylum that has no freshwater or terrestrial members. Characteristics features of Echinoderms Phylum-Echinodermata consists of the following characteristic features: These are spiny bodies and have an endoskeleton of…