''Microdrillia'' is a
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of very small
sea snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...
s,
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda ().
This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...
mollusk
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...
s in the
family
Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...
Borsoniidae
Borsoniidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea.Bouchet, P. (2011). Borsoniidae. Accessed through: World Register of Marine Species at http://www.marinespecies.o ...
.
[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]
Description
The species in this genus are characterized by a well-developed, multispiral, closely coiled
protoconch
A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...
. One to three of its basal whorls are costulate. The
body whorl
The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk.
In gastropods
In gastropods, the b ...
is wholly devoid of costae but spirally carinate. The retral sinus is relatively large, circularly rounded and close to the
suture. The
aperture
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.
An opt ...
is oblique. The
columella is callous, with or without plications. The
siphonal canal
The siphonal canal is an anatomical feature of the shells of certain groups of sea snails within the clade Neogastropoda. Some sea marine gastropods have a soft tubular anterior extension of the mantle called a siphon through which water is ...
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''
Distribution
This marine genus occurs in the
Gulf of Oman
The Gulf of Oman or Sea of Oman ( ar, خليج عمان ''khalīj ʿumān''; fa, دریای عمان ''daryâ-ye omân''), also known as Gulf of Makran or Sea of Makran ( ar, خلیج مکران ''khalīj makrān''; fa, دریای مکرا ...
, off
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
and off Australia (
New South Wales
)
, nickname =
, image_map = New South Wales in Australia.svg
, map_caption = Location of New South Wales in AustraliaCoordinates:
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, es ...
,
Queensland
)
, nickname = Sunshine State
, image_map = Queensland in Australia.svg
, map_caption = Location of Queensland in Australia
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, established_ ...
).
Species
* † ''
Microdrillia aturensis
''Microdrillia'' is a genus of very small sea snails, marine gastropod mollusks in the family Borsoniidae.Bouchet, P.; Gofas, S. (2015). Microdrillia Casey, 1903. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http ...
''
Lozouet, 2017
* ''
Microdrillia circumvertens''
(Melvill & Standen, 1901)
* ''
Microdrillia commentica''
(Hedley, 1915)
* ''
Microdrillia dinos''
Kilburn, 1986
* ''
Microdrillia fastosa
''Microdrillia fastosa'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.Bouchet, P. (2015). Microdrillia fastosa (Hedley, 1907). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http ...
''
(Hedley, 1907)
* † ''
Microdrillia meyeri
''Microdrillia'' is a genus of very small sea snails, marine gastropod mollusks in the family Borsoniidae.Bouchet, P.; Gofas, S. (2015). Microdrillia Casey, 1903. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http ...
''
(Cossmann, 1889)
* ''
Microdrillia niponica
''Microdrillia niponica'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia niponica (E. A. Smith, 1879). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at htt ...
''
(E. A. Smith, 1879)
* ''
Microdrillia optima
''Microdrillia optima '' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia optima (Thiele, 1925). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www. ...
''
(Thiele, 1925)
* † ''
Microdrillia pakaurangia
''Microdrillia pakaurangia'' is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae.Marshall, B. (2015). Microdrillia pakaurangia Powell, 1942 †. In: MolluscaBase (2015). Accessed through: World Register of Ma ...
''
Powell, 1942
* ''
Microdrillia patricia
''Microdrillia patricia'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia patricia (Melvill, 1904). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http:// ...
''
(Melvill, 1904)
* ''
Microdrillia pertinax
''Microdrillia pertinax'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.MolluscaBase eds. (2022). MolluscaBase. Microdrillia pertinax (Hedley, 1922). Accessed through: World Register of Marine Species at: https ...
''
(Hedley, 1922)
* ''
Microdrillia rhomboidales
''Microdrillia rhomboidales'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.
Description
The length of the shell attains 9.6 mm.
Distribution
This marine species occurs off the Philippines
The Philipp ...
''
Stahlschmidt, Poppe & Tagaro, 2018
* ''
Microdrillia sagamiensis
''Microdrillia sagamiensis'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia sagamiensis Kuroda & Oyama, 1971. In: MolluscaBase (2015). Accessed through: World Register of Marine Species ...
''
Kuroda & Oyama, 1971
* ''
Microdrillia sansibarica
''Microdrillia sansibarica'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae
Borsoniidae is a monophyletic family of small to medium-sized sea snails, marine gastropod mollusks in the superfamily Conoidea. ...
''
(Thiele, 1925)
* † ''
Microdrillia serratula''
(Bellardi, 1877)
* ''
Microdrillia stephensensis
''Microdrillia stephensensis'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia stephensensis Laseron, 1954. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at ...
''
Laseron, 1954
* † ''
Microdrillia teretiaeformis''
A.W. Janssen, 1972 Janssen, Mollusken der Twistringer Schichten, N.-Deutschland, Scripta Geol. 10 (1972)
/ref>
* '' Microdrillia trina'' Mansfield, 1925
* ''Microdrillia triporcata
''Microdrillia triporcata'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.WoRMS (2015). Microdrillia triporcata (E. A. Smith, 1879). In: MolluscaBase (2015). Accessed through: World Register of Marine Species at ...
'' (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
''Drilliola difficilis'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.MolluscaBase eds. (2022). MolluscaBase. Drilliola difficilis (E. A. Smith, 1879). Accessed through: World Register of Marine Species at: h ...
'' (E. A. Smith, 1879)
* ''Microdrillia loprestiana'' (Calcara, 1841): synonym of ''Drilliola loprestiana
''Drilliola loprestiana'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.
Taxonomy
Figueira & Absalão (2010) used the name ''Drilliola pulchella'' (Verrill, 1880) for the species generally known as ''Drillio ...
'' (Calcara, 1841)
* ''Microdrillia pruina'' (Watson, 1881): synonym of ''Retidrillia pruina
''Retidrillia pruina'' is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.Bouchet, P. (2015). Retidrillia pruina (Watson, 1881). Accessed through: World Register of Marine Species at http://www.marinespecies.org/ap ...
'' (Watson, 1881)
* ''Microdrillia zeuxippe'' (Dall, 1919): synonym of '' Drilliola zeuxippe'' (Dall, 1919)
References
* 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
Casey T.L. (1903). ''Notes in the Conrad collection of Vicksburg fossils, with descriptions of new species''. Proceedings of the Academy of Natural Sciences, Philadelphia 55: 261-283
Bouchet P., Kantor Yu.I., Sysoev A. & Puillandre N. (2011) A new operational classification of the Conoidea. Journal of Molluscan Studies 77: 273-308
*
De Jong K.M. & Coomans H.E. (1988) Marine gastropods from Curaçao, Aruba and Bonaire. Leiden: E.J. Brill. 261 pp.
{{Commons category