Microdrillia

Microdrillia
	Shell of † Microdrillia aturensis (holotype in MNHN, Paris)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Borsoniidae
Genus:	Microdrillia; Casey, 1903
Type species
	† Oligotoma meyeri Cossmann, 1889;
Synonyms
	Acrobela Thiele, 1925 (Invalid: junior homonym of Acrobela Foerster, 1862 (Hymenoptera); Acropota is a replacement name); Acropota F. Nordsieck, 1977;

Microdrillia is a genus of very small sea snails, marine gastropod mollusks in the family Borsoniidae.^[1]

Description

The species in this genus are characterized by a well-developed, multispiral, closely coiled protoconch. One to three of its basal whorls are costulate. The body whorl is wholly devoid of costae but spirally carinate. The retral sinus is relatively large, circularly rounded and close to the suture. The aperture is oblique. The columella is callous, with or without plications. The siphonal canal is short or subobsolete.

The following species of this genus are also found as fossils in the age range of 48.6 Ma to 0.781 Ma: Microdrillia comatotropis, Microdrillia cossmanni, Microdrillia crispata, Microdrillia harrisi, Microdrillia ouchitae, Microdrillia propetrina, Microdrillia tersa, Microdrillia trina ^[2]

Distribution

This marine genus occurs in the Gulf of Oman, off South Africa and off Australia (New South Wales, Queensland).

Species

† Microdrillia aturensis Lozouet, 2017
Microdrillia circumvertens (Melvill & Standen, 1901)
Microdrillia commentica (Hedley, 1915)
Microdrillia dinos Kilburn, 1986
Microdrillia fastosa (Hedley, 1907)
† Microdrillia meyeri (Cossmann, 1889)
Microdrillia niponica (E. A. Smith, 1879)
Microdrillia optima (Thiele, 1925)
† Microdrillia pakaurangia Powell, 1942
Microdrillia patricia (Melvill, 1904)
Microdrillia pertinax (Hedley, 1922)
Microdrillia rhomboidales Stahlschmidt, Poppe & Tagaro, 2018
Microdrillia sagamiensis Kuroda & Oyama, 1971
Microdrillia sansibarica (Thiele, 1925)
† Microdrillia serratula (Bellardi, 1877)
Microdrillia stephensensis Laseron, 1954
† Microdrillia teretiaeformis A.W. Janssen, 1972 ^[3]
Microdrillia trina Mansfield, 1925
Microdrillia triporcata (E. A. Smith, 1879)

Species brought into synonymy

Microdrillia crispata (Cristofori & Jan, 1832): synonym of Drilliola crispata (De Cristofori & Jan, 1832)
Microdrillia difficilis (E. A. Smith, 1879): synonym of Drilliola difficilis (E. A. Smith, 1879)
Microdrillia loprestiana (Calcara, 1841): synonym of Drilliola loprestiana (Calcara, 1841)
Microdrillia pruina (Watson, 1881): synonym of Retidrillia pruina (Watson, 1881)
Microdrillia zeuxippe (Dall, 1919): synonym of Drilliola zeuxippe (Dall, 1919)

References

^ ^a ^b Bouchet, P.; Gofas, S. (2015). Microdrillia Casey, 1903. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137821 on 2016-03-14
^ Fossilworks: Microdrillia
^ Janssen, Mollusken der Twistringer Schichten, N.-Deutschland, Scripta Geol. 10 (1972)

Thiele J. (1925). Gastropoden der Deutschen Tiefsee-Expedition. II Teil. Wissenschaftliche Ergebnisse der Deutschen Tiefsee-Expedition auf dem Dampfer "Valdivia" 1898–1899. 17(2): 35-382, pls 13-46
Kilburn R.N. (1986). Turridae (Mollusca: Gastropoda) of southern Africa and Mozambique. Part 3. Subfamily Borsoniinae. Annals of the Natal Museum. 27: 633–720.

External links

[WoRMS-1] Bouchet, P.; Gofas, S. (2015). Microdrillia Casey, 1903. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137821 on 2016-03-14

[2] Fossilworks: Microdrillia

[3] Janssen, Mollusken der Twistringer Schichten, N.-Deutschland, Scripta Geol. 10 (1972)

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