Dorsanum

Lore & Background

The genus Dorsanum was established by Gray in 1847. It belongs to the subfamily Dorsaninae within the family Nassariidae, which comprises the Nassa mud snails or dog whelks. The genus contains both living and fossil species, with the extant species Dorsanum miran described by Bruguière in 1789. Several fossil species have been described from various authors, including Lozouet (1999), K. Martin (1931), van Voorthuysen (1944), Beyrich (1854), and d'Orbigny (1852).

Taxonomic revisions have led to many species originally placed in Dorsanum being moved to other genera. For instance, Dorsanum belangeri is now considered a synonym of Bullia tranquebarica, and Dorsanum granulosum is treated as Naytia granulosa. Other species have been reassigned to Bullia, such as Dorsanum gruveli, Dorsanum mauritianum, and Dorsanum terebraeforme. The subgenus Dorsanum (Adinus) H. Adams & A. Adams, 1853 is considered a synonym of Bullia Gray, 1833.

The genus has been studied in phylogenetic and systematic contexts, notably in a 2016 revision of the Nassariidae by Galindo, Puillandre, Utge, Lozouet, and Bouchet, which examined the relationships within the family.

Reader's Guide

Dorsanum represents a genus within the Nassariidae that illustrates the complexities of gastropod taxonomy, particularly the shifting boundaries between related genera. The genus includes both living and fossil species, with the extant Dorsanum miran serving as a type species. The fossil record of Dorsanum spans multiple described species from various authors, indicating a broader historical distribution. However, many species originally assigned to Dorsanum have been synonymized or transferred to other genera such as Bullia, Naytia, and Buccinanops, reflecting ongoing taxonomic refinement. The subgenus Dorsanum (Adinus) has been synonymized with Bullia, further complicating the genus's boundaries. The 2016 phylogenetic study by Galindo et al. contributed to a revised understanding of the Nassariidae, placing Dorsanum within the subfamily Dorsaninae. Despite these revisions, Dorsanum remains a recognized genus with a distinct subfamilial placement. Its significance lies in its role as a case study in the dynamic classification of marine gastropods, where morphological and molecular evidence continue to reshape taxonomic understanding. The genus's fossil species provide insights into the evolutionary history of the Nassariidae, while its extant species contribute to the biodiversity of mud snails in marine environments.

Did You Know?

• Dorsanum is a genus in the subfamily Dorsaninae of the family Nassariidae.
• The extant species Dorsanum miran was described by Bruguière in 1789.
• Several fossil species of Dorsanum were described by Lozouet in 1999.