Lucilla singleyana

Lucilla singleyana is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusk in the family Helicodiscidae.[3]

Lucilla singleyana
Five shells of Lucilla singleyana, scale bar is in mm
NE[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Superfamily:
Punctoidea
Family:
Helicodiscidae
Genus:
Lucilla
Species:
L. singleyana
Binomial name
Lucilla singleyana
(Pilsbry, 1889)[2]
Synonyms
  • Zonites singleyanus Pilsbry, 1889
  • Helicodiscus (Hebetodiscus) singleyanus inermis H. B. Baker, 1929

The shell of this species is about 2 mm in width.

Original description

Lucilla singleyana was originally discovered and described (under the name Zonites singleyanus) by Henry Augustus Pilsbry in 1889.[2]

Pilsbry's original text (the type description) reads as follows:

Zonites singleyanus Pilsbry. Proc. A. N. S. Philada., 1888, PI. xvii, figs. m,m,m.

Shell minute, broadly umbilicate, planorboid, the spire scarcely perceptibly exserted; subtranslucent, waxen white, shining, smooth, under a strong lens seen to be slightly wrinkled by growth-lines; whorls three, rather rapidly increasing, separated by well-impressed sutures, convex, the apex rather large; body-whorl depressed, slightly descending, indented below around the umbilicus; aperture small, semilunar, oblique; peristome simple, acute. Umbilicus nearly one-third the diameter of the shell, wide, showing all the whorls.

Alt. 1, diam. 2 mill.

New Braunfels, Comal Co., Texas.

Allied to Z. minusculus, but much more depressed, more shining, smoother, smaller, with broader umbilicus and a complete whorl less than minusculus.

This species, one of the most 'distinct of the smaller forms of Hyalina, was communicated to me by Mr. J. A. Singley, in whose honor it is named. I have also found a few specimens among the shells collected by myself in central Texas, during the winter of 1885-'86. With Z. singleyanus at New Braunfels are found quantities of Z. minusculus. The latter species exhibits some variation, being often more depressed than most northern specimen. This depressed form has been noticed in Mexico by Strebel,* who proposes for Z. minusculus the new generic title of Chanomphalus, which of course is completely synonymous with Pseudohyalina Morse, 1864, and this again is not different enough from Hyalina to warrant the erection of a new genus or sub-genus. There is some variation in the width of the umbilicus in Texan specimens of Z. minusculus, but I have not seen specimens with it so wide as Dr. Dall indicates for his var. alachuana, from Florida. H elegantulus Pfr. is about the size and form of my Zonites singleyanus, but it is a strongly sculptured species.

* Vide Beitrag zur Kenntniss der Fauna mexikanischer Land und Süsswasser

Conchylien, Theil iv, p. 19, pi. iv, fig. 10. (1880.)

Distribution

This species is Holarctic in distribution.

The indigenous distribution for this species includes North America.

Then non-indigenous distribution areas include:

This species was previously announced from the Czech Republic since 1988, but later in 2009 was all findings recognized as Lucilla scintilla.[5]

This species has been introduced to New Zealand.[7]

Ecology

This species lives in soil, see soil-inhabitant. Technically this is known as being a terricol species.

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gollark: Heavserver has rotated 2π radians.
gollark: Okay, revolution complete.
gollark: 34.91ms¯¹, which might be more convenient.
gollark: 0.0349065850 s¯¹.

References

This article incorporates public domain text from the reference.[2]

  1. 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Cited 28 May 2007.
  2. Pilsbry H. A. 14 May 1889. New and little known American mollusks, no. I. Proceedings of the Academy of Natural Sciences of Philadelphia 41: 81-89, pl. 3. Description is at page 84.
  3. (in Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
  4. Čejka, Tomáš (2000). "First record of the land snail Helicodiscus (Hebetodiscus) singleyanus inermis H. B. Baker, 1929 (Gastropoda, Punctidae) in Slovakia". Biologia, Bratislava. 55: 475–476.
  5. Horsák M., Šteffek J., Čejka T., Ložek V. & Juřičková L. (2009). "Occurrence of Lucilla scintilla (R.T. Lowe, 1852) and Lucilla singleyana (Pilsbry, 1890) in the Czech and Slovak Republics – with remarks how to distinguish these two non-native minute snails". Malacologica Bohemoslovaca 8: 24-27. Online serial at <http://mollusca.sav.sk> 18-June-2009.
  6. Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109.
  7. Spencer H.G., Willan R.C., Marshall B.A. & Murray T.J. (2011). Checklist of the Recent Mollusca Recorded from the New Zealand Exclusive Economic Zone
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