WebEtimologia, denominazione e semantica. L'esploratore Constantine John Phipps fu il primo a descrivere l'orso polare come specie a sé stante nel 1774. Scelse il nome scientifico Ursus maritimus, dal latino orso marittimo, per via dell'habitat naturale dell'animale.. Nella lingua degli Inuit viene chiamato come Nanook. Il popolo Yupik, originario dell'Alaska lo chiama …

WebNell'ambito della specie, vengono, fin dai tempi della prima classificazione linneana, generalmente distinte due sottospecie: . Gulo gulo gulo, la sottospecie nominale, diffusa in Eurasia;; Gulo gulo luscus, diffusa in Nord America.; Tradizionalmente, vengono classificate altre quattro sottospecie di ghiottone (Gulo gulo albus Kerr, 1792 e Gulo gulo …

WebA classification of living organisms. Recent advances in biochemical and electron microscopic techniques, as well as in testing that investigates the genetic relatedness among species, have redefined previously established taxonomic relationships and have fortified support for a five-kingdom classification of living organisms. This alternative …

Webrotifer, also called wheel animalcule, any of the approximately 2,000 species of microscopic, aquatic invertebrates that constitute the phylum Rotifera. Rotifers are so named because the circular arrangement of moving cilia (tiny hairlike structures) at the front end resembles a rotating wheel. Although common in freshwater on all continents, some species occur in …

WebSea spiders are marine arthropods of the order Pantopoda (lit. ‘all feet’), belonging to the class Pycnogonida, hence they are also called pycnogonids (/ p ɪ k ˈ n ɒ ɡ ə n ə d z /; named after Pycnogonum, the type genus; with the suffix -id). Most are toward the smaller end of this range in relatively shallow depths; however, they can grow to be quite large in …

WebSponges, the members of the phylum Porifera (/ p ə ˈ r ɪ f ər ə /; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.. Sponges have …

WebDeuterostomia (/ ˌ dj uː t ər ə ˈ s t oʊ m i. ə /; lit. 'second mouth' in Greek) are animals typically characterized by their anus forming before their mouth during embryonic development.The group's sister clade is Protostomia, animals whose digestive tract development is more varied. Some examples of deuterostomes include vertebrates (and …

WebĐộng vật là một nhóm sinh vật đa bào, nhân chuẩn, được phân loại là giới Động vật (Animalia, đồng nghĩa: Metazoa) trong hệ thống phân loại 5 giới.Cơ thể của chúng lớn lên khi phát triển. Hầu hết động vật có khả năng di chuyển một cách tự nhiên và độc lập.

WebEtymology. The word "animal" comes from the Latin animalis, meaning 'having breath', 'having soul' or 'living being'. The biological definition includes all members of the kingdom Animalia. In colloquial usage, the term animal is often used to refer only to nonhuman animals. The term "metazoa" is from Ancient Greek μετα (meta, used to mean "later") and …

WebJul 14, 2021 · The Cambrian Explosion by nature is a three-phased explosion of animal body plans alongside episodic biomineralization, pulsed change of generic diversity, body size variation, and progressive increase of ecosystem complexity. The Cambrian was a time of crown groups nested by numbers of stem groups with a high-rank taxonomy of …