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Monadenia marmarotis

S.S. Berry, 1940

Marble Sideband

G1Critically Imperiled Found in 1 roadless area NatureServe Explorer →
G1Critically ImperiledGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.119678
Element CodeIMGASC7060
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single state or province
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyBradybaenidae
GenusMonadenia
Synonyms
Monadenia rotiferS.S. Berry, 1940
Concept Reference
Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, P. M. Mikkelsen, R. J. Neves, C. F. E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F. G. Thompson, M. Vecchione, and J. D. Williams. 1998. Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland. 526 pp.
Taxonomic Comments
Roth (2001) concluded that Monadenia rotifer is synonymous with M. marmarotis
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-04-17
Change Date2002-10-08
Edition Date2023-04-17
Edition AuthorsFraser, D.F. (2023), Hunting, K. (2022)
Threat ImpactUnknown
Range Extent<100 square km (less than about 40 square miles)
Number of Occurrences6 - 20
Rank Reasons
This species has a highly restricted range and is known from a small number of occurrences. The ecology and the threats for this species are poorly understood.
Range Extent Comments
This species is known only from Siskiyou County, California, USA. Based on the locations derived from element occurrences in the California Natural Diversity Database (CNDDB), records from GBIF (2023), Roth (2001) and Ingram (1949), the range extent is approximately 15.5 square km. However, the area is rugged and difficult to survey so the species is likely more widespread than suggested by the known occurrences. Roth (2001) concluded that M. rotifer is synonymous with M. marmarotis and the single known occurrence for M. rotifer is included in this assessment.

Roth and Sadeghian (2003) report this species from Trinity County, however no specimen records were found from this county and it was not included in the calculation of range extent.
Occurrences Comments
There are six known occurrences of this species.
Threat Impact Comments
Information about the habitat requirements and ecology of this species are sparse and the relative importance of different habitats (forested, non-forested, caves) have not been determined; therefore threats to this species are unknown. Forest fires, recreational activities in caves, and climate change are potential threats. Forest fires may impact a portion of the species that are found in open forest types but not those that are found living in sparsely vegetated sites and cave habitats. The caves inhabited by this species are subject to recreational caving, however, it is not known if this activity poses a significant threat to this species. Prolonged drought and extreme heat events, both of which are predicted to increase in northern California have not been studied in this species but the part of the population that is found in cold caves may isolated from these threats.
Ecology & Habitat

Description

A relatively large reddish brown land snail.

Habitat

The species is known from under limestones slabs and in caves. Empty shells have been found in both forested areas (Western White Pine (Pinus monticolus), Shasta Red Fir (Abies magnifica), Foxtail Pine (P. balfouriana) and relatively open areas with little vegetation. All localities are associated with a single tectonic block of white or gray-and-white laminated marble (Roth 2001).
Terrestrial Habitats
Forest - Mixed
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
Threat Assessments
ThreatScopeSeverityTiming
6 - Human intrusions & disturbanceUnknownUnknownHigh (continuing)
6.1 - Recreational activitiesUnknownUnknownHigh (continuing)
7 - Natural system modificationsUnknownUnknownHigh - moderate
7.1 - Fire & fire suppressionUnknownUnknownHigh - moderate
7.1.1 - Increase in fire frequency/intensityUnknownUnknownHigh - moderate
11 - Climate change & severe weatherPervasive (71-100%)UnknownHigh - moderate
11.2 - DroughtsPervasive (71-100%)UnknownHigh - moderate
11.3 - Temperature extremesPervasive (71-100%)UnknownHigh - moderate

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Roadless Areas (1)
California (1)
AreaForestAcres
PortugueseKlamath National Forest18,915
References (6)
  1. Berry, S.S. 1940. Nine new snails of the genus <i>Monadenia</i> from California. Journal of Entomology and Zoology, Pomona College 32(1): 1-17.
  2. Ingram, W.M. 1949. A check list of the Limacidae, Endodontidae, Arionidae, Succineidae, Pupillidae, Valloniidae, Carychiidae, and Truncatellidae of California. Bulletin of the Southern California Academy of Sciences 48(1):19-38.
  3. Roth, B. 2001. Identity of the land snail <i>Monadenia rotifer</i> Berry, 1940 (Gastropoda: Pulmonata: Bradybaenidae). American Malacological Bulletin, 16(1/2): 61-64.
  4. Roth, B. and P.S. Sadeghian. 2006. Checklist of the land snails and slugs of California. 2nd ed. Santa Barbara Museum of Natural History Contributions in Science 3. 82 pp.
  5. Sullivan, R.M. 2021. Phylogenetic relationships among subclades within the Trinity bristle snail species complex, riverine barriers, and re-classification. California Fish and Wildlife Special CESA Issue: 107-145. Online at http://www.doi.org/10.51492/cfwj.cesasi.6
  6. Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, P. M. Mikkelsen, R. J. Neves, C. F. E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F. G. Thompson, M. Vecchione, and J. D. Williams. 1998. Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland. 526 pp.