Xeroplexa arrabidensis

Xeroplexa arrabidensis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Geomitridae.[1] The species epithet arrabidensis is an adjective derived from the type locality Serra da Arrábida.[2]

Xeroplexa arrabidensis
Apertural view of the shell of Xeroplexa arrabidensis
Not evaluated (IUCN 3.1)
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Superfamily:
Helicoidea
Family:
Geomitridae
Subfamily:
Helicellinae
Genus:
Xeroplexa
Species:
X. arrabidensis
Binomial name
Xeroplexa arrabidensis
(Holyoak & Holyoak, 2014)
Synonyms
  • Candidula arrabidensis (Holyoak & Holyoak, 2014)

Description

Shape convex to low-convex above, flattened below. Whorls rounded, with shallow to very shallow sutures. Umbilicus moderately wide, symmetrical, deep, exposing upper whorls, usually slightly overlapped by reflected peristome. Mouth broadly oval, except where interrupted by penultimate whorl; last part of body whorl expanding, descending near mouth. Shell moderately thick, slightly translucent; surface glossy above and often strongly glossy below. Ground-colour pale brown throughout, or whitish beneath; upperside nearly always with brown to blackish-brown markings that are very variable in extent, but form sharply defined bands on only a minority of shells, consisting instead of interrupted bands or rows of irregular blotches, often with whitish rib crests; underside also with very variable dark markings, often in several thin interrupted bands; underside some- times mainly dark brown. Transverse ribs on upperside of shell ± regular on higher whorls of spire, becoming weak or partly absent on body whorl; on underside generally weaker.[2]

Xeroplexa arrabidensis Serra da Arrábida. Setúbal (Portugal). Scale bar 0.5 cm.

Distribution

Endemic to Portugal, where mainly restricted to rocky limestone habitats in Estremadura (Sétubal District) extending from Serra da Arrábida westwards to near Cabo Espichel.

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References
  1. Chueca, Luis J.; Gómez-Moliner, Benjamín J.; Madeira, María José; Pfenninger, Markus (January 2018). "Molecular phylogeny of Candidula (Geomitridae) land snails inferred from mitochondrial and nuclear markers reveals the polyphyly of the genus". Molecular Phylogenetics and Evolution. 118: 357–368. doi:10.1016/j.ympev.2017.10.022. PMID 29107619.
  2. Holyoak, David T.; Holyoak, Geraldine A. (2014). "A review of the genus Candidula in Portugal with notes on other populations in western Europe (Gastropoda, Pulmonata: Hygromiidae)". Journal of Conchology. 41: 629–672.
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