Species: Monadenia fidelis minor

A Terrestrial Snail
Species
Invertebrates

Gray (1834) description in latin. Shell umbilicated, orbicularly subconoid, epidermis light yellow or brownish on upper surface, with a black or chestnut-colored revolving band visible on the four outer whorls, the lower surface dark chestnut, sometimes uniformly black; suture distinct, impressed; whorls 7, rounded, spirally striate, with minute, delicate, impressed lines, the striae of increase very distinct, and occasionally with rows of tubercles running obliquely to the striae of growth, bearing very distinct raised lines under the epidermis, quite like prostrate hairs; peristome reflected below, simple above, thickened; aperture ovate, banded within; umbilicus open, a little contracted by the reflection of the peristome; base flattened-convex (Binney 1985).

Kingdom
Animalia
Phylum
Mollusca
Class

Gastropoda

Order

Stylommatophora

Family

Bradybaenidae

Genus

Monadenia

Natureserve Explorer
Source:
ELEMENT_GLOBAL.2.109837
Classification
Informal Taxonomy
Animals, Invertebrates - Mollusks - Terrestrial Snails
Formal Taxonomy
Animalia - Mollusca - Gastropoda - Stylommatophora - Bradybaenidae - Monadenia - subspecies are more approproately classed as color morphs of the primary species (Branson 1993).

Gray (1834) description in latin. Shell umbilicated, orbicularly subconoid, epidermis light yellow or brownish on upper surface, with a black or chestnut-colored revolving band visible on the four outer whorls, the lower surface dark chestnut, sometimes uniformly black; suture distinct, impressed; whorls 7, rounded, spirally striate, with minute, delicate, impressed lines, the striae of increase very distinct, and occasionally with rows of tubercles running obliquely to the striae of growth, bearing very distinct raised lines under the epidermis, quite like prostrate hairs; peristome reflected below, simple above, thickened; aperture ovate, banded within; umbilicus open, a little contracted by the reflection of the peristome; base flattened-convex (Binney 1985).

Habitat Type Description
Terrestrial
Migration
false - false - false - Crawling on slime trails or perhaps carried by animals. May be subject to transport by landslides or floods and heavy rains, but Talmadge, observing MONADENIA SETOSA, reported such populations lasted only a year (Talmadge 1960).
Non-migrant
false
Locally Migrant
false
Food Comments
Not precisely determined for the subspecies. In general, MONADENIA SP. feed on plant tissue (Roth 1981) or fungi (Crowell 1979).
Reproduction Comments
Not specifically described. Hyman (1967), as a general statement, says terrestrial pulmonates lay rather large yolky eggs at night in humid places such as depressions in soil, crevices in logs, under fallen logs, under loose bark, and under layers of fallen leaves of the forest floor, laying one at a time in a heap, the eggs hatching as an anatomically complete young snail.
Ecology Comments
Appears to require large amounts of moisture (Branson 1983).
Length
3.2
NatureServe Global Status Rank
G4G5T2
Global Status Last Reviewed
2005-03-24
Global Status Last Changed
2003-05-12
Other Status

DD - Data deficient

Conservation Status Map
<img src="http://www.natureserve.org/explorer/servlet/GetMapGif?US.CA=SNR&US.OR=S1&US.WA=S1" alt="Conservation Status Map" style="width: 475px; height: auto;" />
Global Range
"A species of the oregonian region, found from Humboldt Bay, California, to Vancouver's Island, and eastward to the Cascade Mountains" (Binney 1985).
ELEMENT_GLOBAL.2.109837