尾び節せつ

noun

telson; pygidium; pleon

Zoological term for the terminal segment or posterior body region of arthropods. Telson is the tail segment, pygidium is the posterior body part of certain invertebrates, and pleon is the abdomen of crustaceans. Usage is technical and field-specific.

• カブトガニの尾び節せつは剣けんのような形かたちをしている。

  The telson of a horseshoe crab is shaped like a sword.

• 三さん葉よう虫ちゅうの尾び節せつは分ぶん類るいの重じゅう要ような手てがかりとなる。

  The pygidium of trilobites is an important clue for classification.

noun

hypopygium

Entomological term for the terminal abdominal segment of male insects, often modified for copulation. Highly specialized usage.

• ハエの雄おすの尾び節せつは交こう尾び器きとして特とく殊しゅ化かしている。

  The hypopygium of male flies is specialized as a copulatory organ.