Remasellus parvus - (Steeves, 1964)
Swimming Little Florida Cave Isopod
Synonym(s): Caecidotea parva
Taxonomic Status: Accepted
Related ITIS Name(s): Remasellus parvus (Steeves, 1964) (TSN 92784)
Unique Identifier: ELEMENT_GLOBAL.2.114719
Element Code: ICMAL83010
Informal Taxonomy: Animals, Invertebrates - Crustaceans - Isopods
 
Kingdom Phylum Class Order Family Genus
Animalia Crustacea Malacostraca Isopoda Asellidae Remasellus
Genus Size: B - Very small genus (2-5 species)
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Concept Reference
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Concept Reference: Deyrup, M. and R. Franz. 1994. Rare and Endangered Biota of Florida, Volume IV. Invertebrates. University Press of Florida: Gainesville, Florida. 798 pp.
Concept Reference Code: B94DEY01EHUS
Name Used in Concept Reference: Remasellus parvus
Conservation Status
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NatureServe Status

Global Status: G1G2
Global Status Last Reviewed: 16Apr2014
Global Status Last Changed: 08Aug2007
Rounded Global Status: G1 - Critically Imperiled
Reasons: This species is known from a small number of caves in a relatively narrow region of northern Florida (Walsh, 2001). As a cave species, it is probably quite fragile and sensitive to changes in habitat, especially water quality.
Nation: United States
National Status: N1N2 (08Aug2007)

U.S. & Canada State/Province Status
United States Florida (S1S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent: 250-5000 square km (about 100-2000 square miles)
Range Extent Comments: It is known from a small number of caves in the Ochlockonee, Aucilla, and Suwannee river drainages of Florida, USA (Walsh, 2001).

Area of Occupancy: 26-12,500 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 1 - 20
Number of Occurrences Comments: The species is known from four caves in the Ochlockonee, Aucilla, and Suwannee river drainages of Florida, USA (Walsh, 2001). Given its presence in three drainages, more sites are anticipated.

Population Size: 2500 to >1,000,000 individuals

Number of Occurrences with Good Viability/Integrity: None to very few (0-3)
Viability/Integrity Comments: Because long-term and quantitative data are minimal or non-existent for most troglobitic crustaceans such as this species, there are no specific criteria by which to define a good element occurrence. In lieu of such measures, an occurrence that is observed persistently across many years, that seems to support a large population based on sightings, and that inhabits a site facing no immediate threats will be considered good.

Overall Threat Impact Comments: Presumably sensitive to degradation of aquifers (pollution), alteration (especially reduction) of detrital flow, and saltwater intrusion that may accompany excessive water withdrawal (for agriculture, industry, and human consumption) or sea level rise.

Short-term Trend: Unknown

Long-term Trend: Unknown

Intrinsic Vulnerability: Highly vulnerable
Intrinsic Vulnerability Comments: As a cave species dependent upon detrital flow as well as the quantity and quality of water in the aquifer, it is presumably delicate.

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.

Other NatureServe Conservation Status Information

Inventory Needs: General inventory of populations range-wide. For each population, record geographic extent, population demographics and densities, types and levels of threats, and kind and degree of protection if any.

Protection Needs: Legal protection (by acquisition and/or perpetual conservation easement) of at least some occurrences, including substantial buffer areas. Consider state and potentially federal listing.

Distribution
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Global Range: (250-5000 square km (about 100-2000 square miles)) It is known from a small number of caves in the Ochlockonee, Aucilla, and Suwannee river drainages of Florida, USA (Walsh, 2001).

U.S. States and Canadian Provinces
Color legend for Distribution Map
Endemism: endemic to a single state or province

U.S. & Canada State/Province Distribution
United States FL

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
FL Alachua (12001), Madison (12079), Suwannee (12121), Wakulla (12129)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
03 Waccasassa (03110101)+, withlacoochee (03110203)+, Lower Suwannee (03110205)+, Apalachee Bay-St. Marks (03120001)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Habitat Type: Freshwater
Non-Migrant: N
Locally Migrant: N
Long Distance Migrant: N
Subterranean Habitat(s): Subaquatic
Special Habitat Factors: Subterranean obligate
Economic Attributes Not yet assessed
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Management Summary
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Biological Research Needs: Most aspects of its biology require study. Studies of life history, fecundity, and precise environmental needs would be valuable. Determine population responses to disturbances such as pollution of groundwater and alterations in surface water and detrital flow.
Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 16Apr2014
NatureServe Conservation Status Factors Author: Jackson, D. R. (2014, 2011); Cordeiro, J. (2008)

Zoological data developed by NatureServe and its network of natural heritage programs (see Local Programs) and other contributors and cooperators (see Sources).

References
Help
  • Bowman, T. E. and B. Sket. 1985. Remasellus, a new genus for the troglobitic swimming Florida Asellid isopod, Asellus parvus Steeves. Proceedings of the Biological Society of Washington 98(3): 554-560.

  • Deyrup, M. and R. Franz. 1994. Rare and Endangered Biota of Florida, Volume IV. Invertebrates. University Press of Florida: Gainesville, Florida. 798 pp.

  • McLaughlin, P.A., D.K. Camp, M.V. Angel, E.L. Bousfield, P. Brunel, R.C. Brusca, D. Cadien, A.C. Cohen, K. Conlan, L.G. Eldredge, D.L. Felder, J.W. Goy, T. Haney, B. Hann, R.W. Heard, E.A. Hendrycks, H.H. Hobbs III, J.R. Holsinger, B. Kensley, D.R. Laubitz, S.E. LeCroy, R. Lemaitre, R.F. Maddocks, J.W. Martin, P. Mikkelsen, E. Nelson, W.A. Newman, R.M. Overstreet, W.J. Poly, W.W. Price, J.W. Reid, A. Robertson, D.C. Rogers, A. Ross, M. Schotte, F. Schram, C. Shih, L. Watling, G.D.F. Wilson, and D.D. Turgeon. 2005. Common and scientific names of aquatic invertebrates from the United States and Canada: Crustaceans. American Fisheries Society Special Publication 31: 545 pp.

  • Steeves, H. R., III. 1964. The troglobitic asellids of the United States: the Hobbsi group. American Midland Naturalist 71(2):445-451.

  • Walsh, S.J. 2001. Freshwater macrofauna of Florida karst habitats. Pages 78-88 in E. Kuniansky (ed.). U.S. Geological Survey Karst Interest Group Proceedings, St. Petersburg, Florida, February 13-16, 2001, USGS Water-Resources Investigations Report 01-4011.

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