Staffordiidae

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Staffordiidae
Staffordia daflaensis shell.png
A drawing of an apertural view of a shell of Staffordia daflaensis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
clade limacoid clade
Superfamily: Staffordioidea
Thiele, 1931
Family: Staffordiidae
Thiele, 1931[1]
Genera

See text

Staffordiidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Staffordioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

Staffordiidae is the only family in the superamily Staffordioidea. This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

Staffordiidae is a poorly known[2] family, because it occurs only in the Dafla Hills area of India. The fauna and flora of that area is very insufficiently known in general.[2]

Various sources consider the family Staffordiidae as part of Dyakiidae[3] or Ariophantidae/Dyakiinae.[4]

Distribution[edit]

The distribution of the Staffordiidae includes only India in the Dafla Hills.[2]

This area is close to northern margin of the Indian plate.[2] The historical area of origin of the Staffordiidae is not surely known, because the possible coastal area in southern Asia is considered to have become uninhabitable[2] after the Indian Plate and Eurasian Plate collided 50 and 55 million years ago. The original ancestral area of limacoid families is thought to be the Palaearctic region and south-eastern Asia.[2] Thus it has been hypothetized that the Staffordiidae colonized its current area from the southern margin of the Asian part of the Eurasian Plate during the Oligocene.[2]

Genera[edit]

Genera within the family Staffordiidae include:

The generic name Staffordia is in honor of Brigadier-General Stafford,[who?] who was in command of the punitive force which entered the Dafla Hills for the first time in the winter of 1874-1875.[5]

The foot of Staffordia is pointed.[5] The peripodial margin is simple with a narrow pale margin.[5] There are small right and left shell-lobes.[5]

Reproductive system of Staffordia: the dart-sac is small, globose, with a long cord-like attachment to a coronal gland.[5] The penis is simple.[5] The spermatheca is long.[5]

The radula of Staffordia has aculeate lateral teeth.[5]

Comparison of shells of three Staffordia species:

type specimen of Staffordia staffordi is juvenile
type specimen of Staffordia toruputuensis is juvenile

Cladogram[edit]

Staffordiidae is considered as sister group of all other families in the limacoid clade.[2]

The following cladogram shows the phylogenic relationships of this family and superfamily to the other families within the limacoid clade:[2]


 limacoid clade 
 Staffordioidea 

Staffordiidae




 Dyakioidea 

Dyakiidae


 Gastrodontoidea 

Pristilomatidae




Chronidae




Euconulidae



Trochomorphidae





Gastrodontidae



Oxychilidae







 Parmacelloidea 

Trigonochlamydidae



Parmacellidae



Milacidae





 Zonitoidea 

Zonitidae


 Helicarionoidea 

Helicarionidae




Ariophantidae



Urocyclidae





 Limacoidea 

Vitrinidae




Boettgerillidae




Limacidae



Agriolimacidae









References[edit]

This article incorporates public domain text from the reference.[5]

  1. ^ Thiele J. (1931). Handbuch der systematischen Weichtierkunde Fischer, Jena, 1(2): 632.
  2. ^ a b c d e f g h i Hausdorf B. (2000). "Biogeography of the Limacoidea sensu lato (Gastropoda: Stylommatophora): Vicariance Events and Long-Distance Dispersal". Journal of Biogeography 27(2): 379-390. doi:10.1046/j.1365-2699.2000.00403.x, JSTOR.
  3. ^ Barker G. M. (2001) Gastropods on Land: Phylogeny, Diversity and Adaptive Morphology. 1-146. In: Barker G. M. (ed.) (2001) The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, cited pages: 139-144. ISBN 0-85199-318-4.
  4. ^ a b c d Ramakrishna, Dey A. & Mitra S. C. (PDF created 6 April 2010). "Checklist of Indian Land Mollusca". Zoological Survey of India. accessed 30 June 2010. 65 pp.
  5. ^ a b c d e f g h i j k Godwin-Austen H. H. (1907). Land and freshwater mollusca of India, including South Arabia, Baluchistan, Afghanistan, Kashmir, Nepal, Burma, Pegu, Tenasserim, Malaya Peninsula, Ceylon and other islands of the Indian Ocean; Supplementary to Masers Theobald and Hanley's Conchologica Indica. Taylor and Francis, London. 2: page 184, plate CXIII.

Further reading[edit]

  • Schileyko A. A. (2003). "Treatise on recent terrestrial pulmonate mollusks. 10. Ariophantidae, Ostracolethaidae, Ryssotidae, Milacidae, Dyakiidae, Staffordiidae, Gastrodontidae, Zonitidae, Daudebardiidae, Parmacellidae". Ruthenica, Supplement 2. 1309-1466.

External links[edit]