Doublehorned Batwing Slug

Gastropteron bicornutum is characterized by orange-yellow spots and minute white spots covering the surfaces of the whole cephalic shield, dorsal hump and parapodia, and by the two dorsal posterior processes from which the species gets its name. The parapodia have a thin black marginal line.

Gastropteron is a genus of small colorful sea slugs, marine gastropod molluscs in the family Gastropteridae.

Species

Species within the genus Gastropteron include:

• Gastropteron bicornutum Baba & Tokioka, 1965
• Gastropteron chacmol Gosliner, 1989
• Gastropteron hamanni Gosliner, 1989
• Gastropteron japonicum Tokioka & Baba, 1964
• Gastropteron odhneri Gosliner, 1989
• Gastropteron pacificum Bergh, 1894
• Gastropteron rubrum (Rafinesque, 1814)
• Gastropteron sibogae Bergh, 1905
• Gastropteron sinense A. Adams, 1861
• Gastropteron vespertilium Gosliner & Armes, 1984, commonly known as the "flapping dingbat"
• Gastropteron viride Tokioka & Baba, 1964

Synonomy:

• Gastropteron alboaurantium Gosliner, 1984 = Siphopteron alboaurantium (Gosliner, 1984)
• Gastropteron brunneomarginatum Carlson & Hoff, 1974 = Siphopteron brunneomarginatum (Carlson & Hoff, 1974)
• Gastropteron cinereum Dall, 1925 = Gastropteron pacificum Bergh, 1894
• Gastropteron citrinum Carlson & Hoff, 1974 = Siphopteron citrinum (Carlson & Hoff, 1974)
• Gastropteron flavobrunneum Gosliner, 1984 = Siphopteron flavobrunneum (Gosliner, 1984)
• Gastropteron flavum Tokioka & Baba, 1964 = Siphopteron flavum (Tokioka & Baba, 1964)
• Gastropteron fuscum Baba & Tokioka, 1965 = Siphopteron fuscum (Baba & Tokioka, 1965)
• Gastropteron ladrones Carlson & Hoff, 1974 = Siphopteron ladrones (Carlson & Hoff, 1974)
• Gastropteron meckeli Blainville, 1825 = Gastropteron rubrum (Rafinesque, 1814)
• Gastropteron michaeli Gosliner & Williams, 1988 = Siphopteron michaeli (Gosliner & Williams, 1988)
• Gastropteron pohnpei Hoff & Carlson, 1983 = Siphopteron pohnpei (Hoff & Carlson, 1983)