Microdrillia fastosa

Microdrillia fastosa
Original drawing of a shell of Microdrillia fastosa
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Borsoniidae
Genus:	Microdrillia
Species:	M. fastosa
Binomial name
Microdrillia fastosa (Hedley, 1907)
Synonyms [1]
Pleurotomella fastosaHedley, 1907 (original combination) Turridrupa fastosa(Hedley, 1907)

Microdrillia fastosa is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae. ^[1]

Description

The height of the shell attains 5 mm, its width 1.9 mm.

(Original description) The shell is small, rather solid, slender and has a fusiform shape. It contains 8½ whorls of which six form the protoconch. The colour of adult whorls is straw yellow, the protoconch cinnamon brown.

Sculpture  : running below the suture the adult whorls have a spiral thread which ascends into the protoconch for two whorls. This is followed by a broad concave fasciole, margined in turn by a sharp projecting keel which determines an angle in the contour of the shell. Halfway between the major keel and the suture runs a smaller keel. On the body whorl there are about fourteen spirals, gradually diminishing anteriorly, below the major keel. The fasciole is ornamented by spaced, delicate, concave riblets. Fine arcuate growth lines appear in the interstices of the spiral keels. In the protoconch, the first wliorl and a half are small, rounded, and spirally striate. The rest protrude medially, and are crossed by fine sharp radial riblets, which on the last whorl number twenty-two. Their interstices are latticed by spiral threads.

Distribution

This marine species is endemic to Australia and occurs off New South Wales.

References

1. Bouchet, P. (2015). Microdrillia fastosa (Hedley, 1907). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=848229 on 2016-03-15

• Hedley, C. 1907. The results of deep sea investigation in the Tasman Sea. Mollusca from eighty fathoms off Narrabeen. Records of the Australian Museum 6: 283-304
• Hedley, C. 1922. A revision of the Australian Turridae. Records of the Australian Museum 13(6): 213–359, pls 42-56
• Powell A. W. B. (1966). The molluscan families Speightiidae and Turridae. An evaluation of the valid taxa both Recent and fossil, with lists of characteristic species. Bulletin of the Auckland Institute and Museum 5: 1-184
• Laseron, C. 1954. Revision of the New South Wales Turridae (Mollusca). Australian Zoological Handbook. Sydney : Royal Zoological Society of New South Wales 1-56, pls 1-12.

External links

• Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011) A new operational classification of the Conoidea. Journal of Molluscan Studies 77: 273-308
• "Microdrillia fastosa". Gastropods.com. Retrieved 16 January 2019.