Mammalia Mam*ma"li*a, n. pl. [NL., from L. mammalis. See {Mammal}.] (Zo["o]l.) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother. [1913 Webster]

Note: Mammalia are divided into three subclasses; [1913 Webster] I. {Placentalia}. This subclass embraces all the higher orders, including man. In these the fetus is attached to the uterus by a placenta. [1913 Webster] II. {Marsupialia}. In these no placenta is formed, and the young, which are born at an early state of development, are carried for a time attached to the teats, and usually protected by a marsupial pouch. The opossum, kangaroo, wombat, and koala are examples. [1913 Webster] III. {Monotremata}. In this group, which includes the genera {Echidna} and {Ornithorhynchus}, the female lays large eggs resembling those of a bird or lizard, and the young, which are hatched like those of birds, are nourished by a watery secretion from the imperfectly developed mamm[ae]. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Placentalia — Plac en*ta li*a, n. pl. [NL.] (Zo[ o]l.) A division of Mammalia including those that have a placenta, or all the orders above the marsupials. [1913 Webster] …   The Collaborative International Dictionary of English

  • Placentalĭa — (lat.), s. Säugetiere (Einteilung) …   Meyers Großes Konversations-Lexikon

  • Placentalia — Placentalĭa (Placentarĭa), die Säugetiere, bei denen eine Verbindung von Mutter und Frucht durch einen Mutterkuchen (Plazenta, s.d.) stattfindet; alle Säugetiere mit Ausnahme der Beutel und Kloakentiere (Implacentalia, Aplacentaria) …   Kleines Konversations-Lexikon

  • Placentalia — Placentalia,   die Plazentatiere …   Universal-Lexikon

  • Placentalia — ⇒ Eutheria …   Deutsch wörterbuch der biologie

  • Placentalia —   Placentarios Rango temporal: Cretáceo inferior Presente …   Wikipedia Español

  • Placentalia — Höhere Säugetiere Vier Höhere Säugetiere aus allen vier Überordnungen Systematik Stamm: Chordatiere (Chordata) …   Deutsch Wikipedia

  • placentalia — ˌplasən.ˈtālēə Etymology: New Latin, from placenta + alia synonym of eutheria * * * Placentalia /plas ən tāˈli ə/ plural noun Eutheria, the subclass of placental mammals • • • Main Entry: ↑placenta * * * ‖ Placentalia, n. pl. Zool …   Useful english dictionary

  • Placentalia — Placentaires souris commune …   Wikipédia en Français

  • Placentalia — …   Википедия

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