台灣產四種黏液蛞蝓之比較

Comparison of Four Philomycid Slugs (Gastropoda: Stylommatophora: Philomycidae) of Taiwan

本篇報告針對台灣陸生蝸牛資源調查時，在各地所採集到的黏液蛞蝓34樣本，共21個採集點，進行外觀及生殖系統研究以及棲地分布調查。研究鑑定有2 種已紀錄種為雙線蛞蝓Meghimatium bilineatum（Benson, 1842）和山蛞蝓M. fruhstorferi Collinge, 1901；與2種新紀錄種為恿花蛞蝓M. pictum（Stoliczka, 1873）和皺紋蛞蝓M. rugosum（Chen and Gao, 1982）。根據體型大小可分為兩組：（一）雙線蛞蝓和恿花蛞蝓為體中型，外觀顏色、體表顏色及一般生殖系統約略相近，但主要差異在於兩性腺大小、儲精囊管長度及陰莖與儲精囊管開口於共殖腔的位置；（二）山蛞蝓和皺紋蛞蝓為體大型，外觀及生殖系統也相似，主要差別為皺紋蛞蝓有較瘦長的陰莖。上述兩組不但可由體型來區別，也可由完全兩樣的儲精囊管形態及陰莖開口於共殖腔不同位置來區分。 During the investigation on Taiwan land snail resource, 34 philomycid slugs were collected from 21localities. This study examined external appearances and reproductive system; and it recorded habitatsand distribution in Taiwan as well. This study identified two already recorded species, Meghimatiumbilineatum (Benson, 1842) and M. fruhstorferi Collinge, 1901 and two newly recorded species M. pictum(Stoliczka, 1873) and M. rugosum (Chen and Gao, 1982). Based on size, four Taiwan Meghimatium candivided into two groups: 1. M. bilineatum and M. pictum are medium-sized with almost similar externalcolor pattern and reproductive system as well. The main differences between them are ovotestis size,length of spermathecal duct and the opening position of spermathecal duct, vagina and penis to the terminal atrium, 2. M. fruhstorferi and M. rugosum are large-sized with almost similar externalappearances and reproductive system but M. rugosum can be distinguished from M. fruhstorferi inhaving a longer and narrower penis. The aforementioned two groups can be distinguished not only fromdifferences in size, but also from distinct spermathecal duct morphology and opening position of penisinto the terminal atrium.