noun
Tsushima marten
A subspecies of the Japanese marten (Martes melampus tsuensis) endemic to Tsushima Island.
See also: 貂
ツシマテンは対馬だけに生息する珍しい動物です。
The Tsushima marten is a rare animal that lives only on Tsushima Island.
Refers to the Japanese marten (Martes melampus) in general; ツシマテン is a specific subspecies.
From 対馬 (Tsushima) + 貂 (ten, 'marten'). The exact derivation is straightforward; the name refers to the marten subspecies found on Tsushima Island.