Bullina roseana

Bullina roseana is a species of small sea snail, a bubble snail, a marine gastropod mollusc in the family Bullinidae, one of the families of bubble snails.

Description

The shell of this species is globose, ovate, and has an umbilicus. The shell color is white with 3 pink lines running along the surface of the body whorl, the middle line being twice the width of the other two. The shell also has 7 pinkish axial lines, but they are more diffuse. The spire is relatively low, approximately 1/9 of the shell height, with a large protoconch, and rounded whorls.

The shell sculpture consists of smooth spiral ridges separated by narrow punctate grooves. The ridges are approximately 1/3 to 1/25 of the width of the whorl. The shell has a large aperture which narrows at the upper end and also slightly at the lower end. The outer lip is thin and is joined by the body whorl above the upper spiral line.

The shell has a channelled suture and a white, straight, and broad columella which is slightly truncated at the base. There is a calcified layer over the lower half of the shell aperture which is formed by the inner lip.^[1]

Headshield

This species has a headshield, which has a brown-coloured oral tube that shows through the body wall. The headshield has permanent funnel on each side, which leads water down over the chemosensory Hancock's organ which is within the groove, between the headshield and the foot.^[1]

References