Ratite
Definition
A scientific term designating any flightless running bird of the order of ratites (Struthioniformes), anatomically characterized by severely reduced wings and, specifically, a flat sternum completely lacking a keel (carina), a bony structure essential for anchoring the pectoral muscles required for flight. As an evolutionary consequence, these birds (such as the ostrich, emu, cassowary, or kiwi) permanently lost the capacity for flight, developing powerful legs specialized for high-speed running instead.
Bilingual Equivalents
- Ratite
- Flightless bird
Grammatical & Source Details
| Inflection Type | Feminine noun with standard regular endings in plural and genitive cases. |
| Formation | Formed using the Greek privative prefix 'a-' and Latin 'carina' (keel), referencing a keelless bone structure. |
| Spelling / Pronunciation | [a.ka.ri.ˈna.tə] |
| Source | Encyclopedia of Avian Evolution and Comparative Skeletal Anatomy |
Contextual Usage Examples
RO: Struțul african este cea mai mare acarinată actuală, fiind capabil să atingă viteze uimitoare pe sol în timpul alergării.
EN: The African ostrich is the largest extant ratite, capable of reaching astonishing speeds on the ground during running.
RO: Spre deosebire de speciile zburătoare, o pasăre acarinată nu posedă osul sternal proeminent numit carenă.
EN: Unlike flying species, a flightless running bird does not possess the prominent sternal bone called a keel.
RO: Biologii studiază scheletul de acarinată pentru a înțelege cum s-a produs adaptarea regresivă a membrelor anterioare.
EN: Biologists study the ratite skeleton to understand how the regressive adaptation of the forelimbs occurred.
Idioms & Phrases
Structură de tip acarinată / Keelless / ratite structural type
RO: Configurație scheletică toracică turtită, caracteristică organismelor care nu folosesc zborul batat și nu au nevoie de mușchi pectorali masivi.
EN: A flattened thoracic skeletal configuration, characteristic of organisms that do not utilize flapping flight and lack massive pectoral muscles.
Grupul pasărilor acarinate / The group of ratite birds
RO: Clasificarea taxonomică tradițională ce reunește speciile de pe glob care au evoluat adaptându-se exclusiv la viața terestră.
EN: The traditional taxonomic classification bringing together worldwide bird species that evolved by adapting exclusively to terrestrial life.
Stern de acarinată / Ratite breastbone / keelless sternum
RO: Osul pieptului neted și plat, un indicator anatomic cheie în paleontologie folosit pentru a identifica fosilele păsărilor preistorice mari.
EN: A smooth and flat breastbone, a key anatomical indicator in paleontology used to identify fossils of large prehistoric birds.
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