Tribulus planospira is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
, it is the only species in the genus Tribulus included in the World Register of Marine Species. Tribulus has previously been considered a subgenus of the genera Murex, Purpura, and Thais.
Description The spire is depressed. The whorls are simple, the body whorl ventricose. The aperture is wide. The columella is arcuated. The inner lip is excavated, corrugated at the fore part.Adams, H. & Adams, A. (1853-1858). The genera of Recent Mollusca; arranged according to their organization. London, van Voorst. Vol. 1: xl + 484 pp.; vol. 2: 661 pp.; vol. 3: 138 pls
References
External links Fischer, P. (1880-1887). Manuel de conchyliologie et de paléontologie conchyliologique, ou histoire naturelle des mollusques vivants et fossiles suivi d'un Appendice sur les Brachiopodes par D. P. Oehlert. Avec 23 planches contenant 600 figures dessinées par S. P. Woodward.. Paris: F. Savy. Published in 11 parts (fascicules), xxiv + 1369 pp., 23 pls.