The IUCN Red List of Threatened Species™
ISSN 2307-8235 (online)
IUCN 2008: T134119A3903586
Parathelphusa maculata
Assessment by: Esser, L. and Cumberlidge, N.
View on www.iucnredlist.org
Citation: Esser, L. and Cumberlidge, N. 2008. Parathelphusa maculata. The IUCN Red List of
Threatened Species 2008: e.T134119A3903586.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
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THE IUCN RED LIST OF THREATENED SPECIES™
Taxonomy
Kingdom
Phylum
Class
Order
Family
Animalia
Arthropoda
Malacostraca
Decapoda
Gecarcinucidae
Taxon Name: Parathelphusa maculata De Man, 1879
Synonym(s):
• Potamon tridentatum variety incertum
Taxonomic Notes:
This species was formerly included in the Parathelphusidae but has recently been reassigned to the
Gecarcinucidae; Parathelphusidae is now regarded as a junior synonym of Gecarcinucidae (Klause et al.
in press).
Assessment Information
Red List Category & Criteria:
Least Concern ver 3.1
Year Published:
2008
Date Assessed:
January 1, 2008
Justification:
The assessment by Ng & Yeo (2007) is followed here. Listed as Least Concern in view of its wide
distribution, presumed large population, and because it is unlikely to be declining fast enough to qualify
for listing in a more threatened category.
Geographic Range
Range Description:
Singapore: Singapore. Malaysia: Widespread throughout Peninsular Malaysia: Pulau Aor; Terengganu.
Indonesia: Sumatra: southern half of Sumatra (ca. 1°101'S, 101°15'E) (Ng 1988).
Country Occurrence:
Native: Indonesia (Sumatera); Malaysia (Peninsular Malaysia); Singapore
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
1
Distribution Map
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
2
Population
No information available.
Current Population Trend: Stable
Habitat and Ecology (see Appendix for additional information)
Primarily aquatic. This species prefers lowland streams and seems quite tolerant of muddy waters.
These animals have a high tolerance of low oxygen conditions and can be found in stagnant pools
sometimes. It is common under rocks, logs, vegetation and debris, but also dig deep burrows by the
banks. The burrows always open above the water level, however, the end of the burrow is always filled
with water (burrows can be a metre or more in depth, can be slanted and sometimes bent). Gravid
females rarely move around in the open, instead stay in the burrows. Brooding ones are occasionally
encountered. This is a nocturnal species and is most active after sunset. Can be a pest in rice fields, but
is basically harmless.
Systems: Freshwater
Threats (see Appendix for additional information)
No immediate threat, especially to populations within protected areas throughout its range.
Occasionally sold as pets in the aquarium trade.
Conservation Actions (see Appendix for additional information)
The retention of designated protected areas.
Credits
Assessor(s):
Esser, L. and Cumberlidge, N.
Reviewer(s):
Ng, P. and Yeo, D. and McIvor, A.
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
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Bibliography
Klause, S., Brandis, D., Ng, P.K.L., Yeo, D.C.J. and Schubart , C.D. In press. Phylogeny and Biogeography of
Asian Freshwater Crabs of the family Gecarcinucidae (Brachyura: Potamoidea). Crustacean Issues.
Ng, P.K.L. 1988. The freshwater crabs of Peninsular Malaysia and Singapore. Shing Lee Publishers Pte
Ltd, Singapore.
Ng, P.K.L. and Yeo, D.C.J. 2007. Malaysian Freshwater Crabs: Conservation Prospects and Challenges.
Status of Biological Diversity in Malaysia and Threat Assessment of Plant Species in Malaysia ?(?): 95120.
Citation
Esser, L. and Cumberlidge, N. 2008. Parathelphusa maculata. The IUCN Red List of Threatened Species
2008: e.T134119A3903586. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
Disclaimer
To make use of this information, please check the Terms of Use.
External Resources
For Images and External Links to Additional Information, please see the Red List website.
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
4
Appendix
Habitats
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Habitat
Season
Suitability
Major
Importance?
5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent
Rivers/Streams/Creeks (includes waterfalls)
-
Suitable
Yes
15. Artificial/Aquatic & Marine -> 15.7. Artificial/Aquatic - Irrigated Land
(includes irrigation channels)
-
Suitable
-
Use and Trade
(http://www.iucnredlist.org/technical-documents/classification-schemes)
End Use
Local
National
International
Pets/display animals, horticulture
Yes
No
No
Threats
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Threat
Timing
Scope
Severity
Impact Score
5. Biological resource use -> 5.4. Fishing & harvesting
aquatic resources -> 5.4.1. Intentional use:
(subsistence/small scale)
Ongoing
-
-
-
Stresses:
2. Species Stresses -> 2.1. Species mortality
Conservation Actions in Place
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Conservation Actions in Place
In-Place Land/Water Protection and Management
Occur in at least one PA: Yes
Research Needed
(http://www.iucnredlist.org/technical-documents/classification-schemes)
Research Needed
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
5
Research Needed
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends
Additional Data Fields
Distribution
Estimated area of occupancy (AOO) (km²): >200
Estimated extent of occurrence (EOO) (km²): >2,000
Population
Population severely fragmented: No
© The IUCN Red List of Threatened Species: Parathelphusa maculata – published in 2008.
http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T134119A3903586.en
6
The IUCN Red List Partnership
The IUCN Red List of Threatened Species™ is produced and managed by the IUCN Global Species
Programme, the IUCN Species Survival Commission (SSC) and The IUCN Red List Partnership. The IUCN
Red List Partners are: BirdLife International; Botanic Gardens Conservation International; Conservation
International; Microsoft; NatureServe; Royal Botanic Gardens, Kew; Sapienza University of Rome; Texas
A&M University; Wildscreen; and Zoological Society of London.
THE IUCN RED LIST OF THREATENED SPECIES™