臺灣的擬相手蟹與折顎蟹（十足目：短尾下目：方蟹總科）兩種新紀錄

Two New Records of Parasesarma De Man, 1895 and Ptychognathus Stimpson, 1858 (Decapoda: Brachyura: Grapsoidea) from Taiwan

庫氏擬相手蟹Parasesarma kuekenthali（De Man, 1902）與特異折顎蟹Ptychognathus insolitus Osawa and Ng, 2006在過去僅被記錄於模式產地：印尼的馬黑拉島（Halmaheira）與日本琉球（Ryukyu），最近也在臺灣被發現。臺灣是目前庫氏擬相手蟹分布的最北界，也是特異折顎蟹分布的最南界。本文描述這兩個種類的形態以及生態紀要，包含線繪圖與彩色照片。

Parasesarma kuekenthali (De Man, 1902) and Ptychognathus insolitus Osawa and Ng 2006 are previously only known from type-locality in Halmaheira, Indonesia, and Ryukyu, Japan, but are recently found in Tainan, Taiwan. Taiwan thus becomes the northernmost known locality of Pa. kuekenthali and southernmost known locality of Pt. insolitus. Morphological and ecological notes of the two species are described, and line drawings and color photographs are provided in this paper.