Lampsilis powelli

Kingdom: Animalia

Phylum: Mollusca

Class: Bivalvia

Order: Unionoida

Family: Unionidae

Species: Fatmucket

Arkansas Fatmucket
Arkansas Fatmucket


The Arkansas fatmucket is a medium-sized freshwater mussel with a smooth, shiny, olive brown-colored shell, around 3.9 inches in length. There are lines of small pits running down the shell, appearing to be rays. Inside the shell is a nacre, bluish white and iridescent. Male shells are pointed, while female shells are rounded.

external image QUGOAEMnsDe66zns7ON-2N-ColeBW9GYzxV-AKMzcSpLyuj0C1ZgYhoD23R2a9mTLhDU1x4Mz8BTOjKKJUnCl19CajO1CwNnEwueNAshwXLJldfNKKyW


The fatmucket prefers deep pools and backwater areas containing sand, gravel, or rock, with enough flow to periodically remove organic detritus, leaves, and other debris.

Historical Range

The historic range of fatmuckets most likely include the Caddo River, downstream to the Ouachilta River, and possibly includes the lower reach of the South Fork Caddo River. Thus, the fatmucket is known to exist in the Ouachita, Saline, and Caddo River Systems.


While specific foods of the Arkansas fatmucket are unknown, other mussels are known to feed on phytoplankton, zooplankton, detrius (non-living particulate organic material) and diatoms (a major group of algae).

Estimated number remaining

U.S. Fish and Wildlife Service Regional Office 4, the Arkansas Game and Fish Commission, and the U.S. Forest Service monitor the population of Fatmucket Mussels every five years. However, this data is not available on their website.

external image dR74YJrh8TopnFrbL52fIlzv1opieH7Ex2P8Z8qkrN4Ktqt1Nfd2zeZbSbCY-x3TUbugNUUvA15fk2M8IWKYMUS6jDnitPQOI0-P8JMxqrvcfBrhq3Joexternal image yBdDoY2GU9K33g1Vx0c-C1Wg2W7oDuuJ_BVcnXz_i_0TCjMMuLoq0I_dMOZMdF32PEBFAzrFoeK8wjqEOfBLl2NuT2AyCnux25GVq5JLlI2KLaNXU-v5external image -x5qmUwBIFrColT4OyNoJlWW8IaGFlF8x1ujW-KvuK8vpC58_1eD1N8kUXJUARCShbgUH_XfmmkasoqGYMXxBtdZx9CZPik_IxP6-D00zQ8eh4aQtABSexternal image 5Upm_VqiD-nOviFRecyfKqFOX2RXdHk1BTDsoyWjsx43Vmhi7c9ISVwuAum8Yn82Tvy5Ufd4-TbsYgoyKheAIPSCWOn-KD4SNwXkvVLXyh8KEoNIsYXeexternal image b2jIwE8mlZ3W-I4PZg3iC99aJbMqBUP33lc-CYlAXK2faMhdHEUflsbA8pNDr8hCZRWTPKIiReQmxidTd9JQXPiFiDZeNV1lDg0EyF6nK5rJ1JZHozC5external image Yg_8oNUTZo5Be0mFdDNJQpS-S7KnRBA9dwi4OHydrF_30LThiazc6CvTwni02JRoueO4qclrYRHBCokciXcBzyUU46wh-f8pyhWKlWsmsmPM7PJA8IjVexternal image ik1LzsA4btmMISaNox75jB3d4kf1xWwfn82LgZuEfuvMEjiE7qQattVIOeD3lNGDAPa4PwootbDPEmlncupNzadgCZvsNCIo7d_vLoYdJ_-hKlOh3ONqexternal image 4JBR-f0pHwivz1pRV9coFnwB7-Yq90y688FjNfXoVeTs2eHEMUDGuiizhGRVWDwH60CtQwBSAKDH2D9DYaheCKH9ODpSEuCRpMPDTsb5_ndQie-bzOotexternal image ru-FeMQDDfQwUwgZUn6svd8Bq7sHUsPq_c76--dUtHiq78oMCz62xndqSIGfAumrGxEPlpDQxYOnF5MrDsBc0GqZRYXBvgIABfqFRKVlNbnOBq3f93rb__http://www.iucnr__

As of April 5, 1990, the Arkansas fatmucket was declared 'threatened

through out its ragne in Arkansas.


Channel alteration, gravel dregeding semdimentation, and degration of water quality has been. Water degradtation is said to be responsible for the absnece of the Arkansas fatmucket from a pause marijuana. Genetic isoltion of the remaining populations is said to remain a threat to their existence. Two populations of the Ouachita River System that is isolated from all other populatoin by Lake Ouachita.

Conservation Efforts

In February 1992, the U.S. Fish and Wildlife Service instituted an Arkansas Fatmucket Mussel Recovery Plan. The parties involved in implementing the plan are the Arkansas Department of Pollution Control and Ecology, USFWS Regional Office 4, the Environmental Protection Agency, the Arkansas Game and Fish Commission, the U.S. Army Corps of Engineers, and the U.S. Forest Service. The main section of the plan is to further protect the habitat where the Fatmucket Mussels live by referencing current legislation that will conserve their environment and using the work of the groups listed above to set up a management plan. Other parts of the plan stress doing research on the life history of the Fatmucket as well as research on their interactions with other fish and mussel species that could impact their survival. An attempt will be made to re-establish their historic habitat if possible. The essential goal is to recover populations to make them viable and monitor the population levels to make sure they do not become endangered again. However, as efforts are still in progress it is predicted that this goal will not be achieved until the year of 2049.

Video about threats to freshwater mussels such as Fatmuckets

Works Cited
"Arkansas Fatmucket Mussel (Lampsilis Powelli) Recovery Plan." U.S. Fish and Wildlife Service. U.S. Fish and Wildlife Service, 1992. Web. 11 Jan. 2013. <>.
"Arkansas Fatmucket." Wikipedia. Wikimedia Foundation, 01 Nov. 2013. Web. 11 Jan. 2013. <>.
"Fat Mucket Mussel (Lampsilis Siliquoidea)." / Species Information / Species in Need of Conservation (SINC) / Threatened and Endangered Wildlife / Services / KDWPT. Kansas Department of Wildlife, Parks and Tourism. Web. 11 Jan. 2013. <>.
"Recovery Plan Action Status." Recovery Plan Action Status. U.S. Fish and Wildlife Service. Web. 11 Jan. 2013. <>.
"Science Nation - Threats to Freshwater Mussels and the Consequences for Ecosystems." YouTube. YouTube, 08 Mar. 2012. Web. 11 Jan. 2013. <>.
"Species Profile for Arkansas Fatmucket (Lampsilis Powellii)." Species Profile for Arkansas Fatmucket (Lampsilis Powellii). U.S. Fish and Wildlife Service. Web. 11 Jan. 2013.