Lancelet
Definition
A small (a few centimeters), primitive marine vertebrate with a translucent, elongated body pointed at both ends, belonging to the phylum Cephalochordata. This structural organism represents an essential evolutionary transition link, as it retains the notochord, neural tube, and pharyngeal slits throughout its entire life, serving as a classic model in the study of comparative chordate anatomy.
Bilingual Equivalents
- Lancelet
- Amphioxus
Grammatical & Source Details
| Inflection Type | Masculine noun, regular structural plural variations following standard biological terminology. |
| Formation | Scientific neologism derived from Greek roots 'amphi' (both sides) and 'oxys' (sharp), describing its characteristic double-pointed shape. |
| Spelling / Pronunciation | [ˌæm.fi.ˈɒk.səs] |
| Source | International Compendium of Invertebrate Anatomy and Chordate Evolution Metrics |
Contextual Usage Examples
RO: La laboratorul de zoologie, studenții au efectuat o secțiune microscopică printr-un amfiox pentru a observa tubul neural.
EN: At the zoology laboratory, students performed a microscopic section through a lancelet to observe the neural tube.
RO: Un amfiox trăiește de regulă parțial îngropat în nisipul fin al coastelor marine, filtrând apa pentru a se hrăni.
EN: A lancelet typically lives partially buried in the fine sand of marine coasts, filtering water to feed itself.
RO: Absența unei coloane vertebrale osoase la amfiox demonstrează stadiul său primitiv în cadrul filogeniei animalelor.
EN: The absence of a bony vertebral column in the lancelet demonstrates its primitive stage within animal phylogeny.
Idioms & Phrases
Notocord de amfiox / Amphioxus notocord
RO: Ax scheletic elastic caracteristic, întins structural de la un capăt la altul al corpului, ce servește ca suport locomotor permanent.
EN: A characteristic elastic skeletal axis, structurally extending from one end of the body to the other, serving as a permanent locomotor support.
Anatomie de amfiox / Amphioxus anatomy
RO: Configurație structurală simplificată a corpului cordatelor, definită prin miotome segmentare și lipsa unui creier diferențiat.
EN: A simplified structural configuration of the chordate body, defined by segmental myotomes and the lack of a differentiated brain.
Stadiu de amfiox / Amphioxus-like stage
RO: Model evolutiv de referință utilizat de embriologi pentru a descrie faza de tranziție de la nevertebrate la primele vertebrate craniate.
EN: A reference evolutionary model used by embryologists to describe the transitional phase from invertebrates to the first craniate vertebrates.
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