young, 1.5 mm
with egg masses
Micromelo undatus (Brugiere, 1792)
|Maximum size: 40 mm.
This bubble shell has a thin, strongly inflated, flesh-colored shell
marked by three spiral brown lines that are joined by wavy axial brown
lines. The body is translucent cream shading to iridescent green-yellow
marginally and spotted with opaque white. (Note 1)
is a moderately rare diurnal species found crawling in the open in rocky habitats at moderately protected to highly exposed
sites, generally at depths of < 1 to 4 m (< 3 to 13 ft). Like
members of the family, it feeds on polychaete worms. A 16 mm animal
cream egg mass about 7 mm in height by 3.8 mm in width with a 2 mm wide
ribbon. It hatched in about eight days in the laboratory.
Big Island, Maui, Lanai, Molokai, Oahu, Kauai, Necker, Laysan and Midway:
This is the species listed as Micromelo
guamensis (Quoy and Gaimard, 1825) in Kay, 1979, Pilsbry, 1921, Bertsch &
Johnson, 1981, Kay & Schoenberg-Dole, 1991 and Tinker, 1958. Many sources also list it as Micromelo undata or Micromelo undatum. In Quirk & Wolfe, 1974, it's listed as Micromelo guamensis but illustrated with a photo of Bullina lineata. It's referred to
as the "wavy bubble shell" in Hoover,
1998 & 2006. Bulla scripta Garrett, 1857 is a synonym. (Kay, 1979)
Photo: CP: 12
mm: Mokolea Point, Maui; July 23, 2005.
Observations and comments:
1: Shells of this species show strong red fluorescence under ultraviolet light (395 nM).