Pygidium

Définitions de « pygidium »

Pygidium - Nom commun

• (Zoologie) Partie terminale de l'abdomen de certains arthropodes, notamment chez les trilobites.

  Au fin fond des océans de l'ère primaire, le pygidium du trilobite, terminant son abdomen segmenté, lui donnait l'allure d'une creatûre alien sophistiquée.

Étymologie de « pygidium »

Évolution historique de l’usage du mot « pygidium » depuis 1800

Citations contenant le mot « pygidium »

• A. burmitina is distinguished from most extant species by a poorly developed pygidium and enlarged, very well-developed hind legs. Based on these features, the scientists believe A. burmitina utilized a different movement mechanism than other species, preferring to jump or fly between corollas and plants. The mouth part of A. burmitina is also highly evolved for pollen collection, with enlargement of part of the maxillary palps, which are leg-like structures near the mouth.

• So, quick, here's a general introduction to trilobite anatomy. First thing to know is that the 'three lobes' of the word 'trilobite' refer to the longitudinal divisions of the animal: a central axis with a lateral or pleural lobe on either side of it. There are also, usually, three transverse divisions: cephalic (head) segments, thoracic segments in the middle, and a pygidium or tail.

Traductions du mot « pygidium »

Sources et ressources complémentaires

• Définitions du Littré (1872-1877)
• Définitions du Wiktionnaire