Parazoa (Parazoa, gr. Παρα-, para, "next to", and ζωα, zoa, "animals") are a taxon with subkingdom category that is located at the base of the phylogenetic tree of the animal kingdom in opposition to the subkingdom Eumetazoa; they group together the most primitive forms, characterized by not having proper tissues or that, in any case ...

2019年4月6日 · Parazoa is the animal sub-kingdom that includes organisms of the phyla Porifera and Placozoa. Sponges are the most well-known parazoa. They are aquatic organisms classified under the phylum Porifera with about 15,000 species worldwide.

2023年11月1日 · ¿Qué es Parazoa? El filo Parazoa es una categoría taxonómica que incluye los poríferos o esponjas de mar. Son animales primariamente marinos, pero también dulceacuícolas (menos del 2% de las especies), que consisten en agregaciones de células que no forman tejidos u órganos verdaderos, organizadas alrededor de un sistema de conductos ...

In animal: Parazoa: a cellular level of organization. Although the two phyla in this subkingdom, Porifera (sponges) and Placozoa, lack clearly defined tissues and organs, their cells specialize and integrate their activities. Their simplicity has been adaptive, and sponges have remained important in benthic marine habitats since… Read More

2021年12月15日 · The invertebrates, or invertebrata, are animals that do not contain bony structures, such as the cranium and vertebrae.The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges (Figure \(\PageIndex{1}\)).Parazoans (“beside animals”) do not display tissue-level organization, …

2023年5月29日 · Parazoa A subkingdom that includes the sponges (phylum porifera), considered by many zoologists to be intermediate between the subkingdoms protozoa and metazoa.

Multicellular organisms (metazoa) are typically divided into three grades: (1) Mesozoa (a single phylum), (2) Parazoa (phylum Porifera, sponges; and phylum Placozoa), and (3) Eumetazoa (all other phyla).

Parazoans are sponges of various sizes, shapes, and colors that lack specialized tissue and are classified as animals. Learn about the definition, characteristics, and overall composition of...

The Parazoa are an ancestral subkingdom of animals, literally translated as "beside the animals". Parazoans differ from their choanoflagellate ancestors in that they are macroscopic and have differentiated cells, but unlike "true animals" ( Eumetazoa ), they do not have tissues.

Parazoa English: Parazoa means “near to animals”. Zoology Parazoa have symmetry in all directions. Their tissues are amorph. Their cells are unspecialized, and thus they have no organs. Animal theory Parazoa are identical to the sponges. In the Animal theory the protozoa, unicellular animals, are added to this phylum.