Western sand darter

The western sand darter (Ammocrypta clara) is a species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches. It is native to the central United States.

Western sand darter
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Percidae
Genus: Ammocrypta
Species:
A. clara
Binomial name
Ammocrypta clara
Synonyms[2]
  • Etheostoma clarum (D. S. Jordan & Meek, 1885)

Distribution

The western sand darter occurs in river systems from Lake Michigan to Texas, including several sections of the Mississippi Basin.[1] Its range extends as far east as the Elk River in West Virginia.[3]

Distribution map

Description

This species is up to 7.1 centimeters in length.[2] It is slender and nearly cylindrical in shape. It is pale, translucent silvery white with yellowish coloration along the back. It is distinguished from other sand darters the lack of dark bands or blotches, and by a spine on its operculum.[4]

Biology

This fish lives in medium and large rivers, over sandy and gravel substrates. It requires loose substrate, because it spends much of its time buried in the sand with just its head protruding.[4] This behavior helps it reach cooler temperatures.[5]

It feeds on invertebrates, especially the larvae of aquatic insects.[4]

It spawns in summer, starting in June in northern regions and May farther south.[4] Females produce an average of 57 eggs at a time, with larger females producing more eggs.[6]

Taxonomy

The Western sand darter was first formally described in 1885 by the American ichthyologists David Starr Jordan (1851-1931) and Seth Eugene Meek (1859-1914) with the type locality given as the Des Moines River at Ottumwa, Iowa.[7] This species forms a clade with the naked sand darter (A. beanii) the Florida sand darter (A. bifascia).[8]

Conservation

This is considered to be a vulnerable species because it has a fragmented distribution and its habitat is degraded in many areas. Increased silt and pollution in river systems reduces the quality of its habitat. The Mississippi River and associated streams and tributaries are heavily channelized and partitioned by locks and dams, eliminating sites where the fish might live.[1]

References
  1. NatureServe (2014). "Ammocrypta clara". IUCN Red List of Threatened Species. 2014: e.T202428A2744621. doi:10.2305/IUCN.UK.2014-3.RLTS.T202428A2744621.en. Retrieved 20 September 2020.
  2. Froese, Rainer and Pauly, Daniel, eds. (2019). "Ammocrypta clara" in FishBase. December 2019 version.
  3. Dan A. Cincotta & Stuart A. Welsh (2010). "Discovery of Ammocrypta clara (Western Sand Darter) in the Upper Ohio River of West Virginia". The American Midland Naturalist. 163 (2): 318–325. doi:10.1674/0003-0031-163.2.318. JSTOR 40730928. S2CID 85926557.
  4. "Ammocrypta clara Western Sand Darter". NatureServe explorer. NatureServe. Retrieved 20 September 2020.
  5. Becker, George. "Fishes of Wisconsin". University of Wisconsin Press. Retrieved 23 April 2017.
  6. Driver, L. J. & Adams, G. L. (2013). "Life history and spawning behavior of the western sand darter (Ammocrypta clara) in Northeast Arkansas" (PDF). The American Midland Naturalist. 170 (2): 199–212. doi:10.1674/0003-0031-170.2.199. JSTOR 23525570. S2CID 85675303.
  7. Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Ammocrypta clara". Catalog of Fishes. California Academy of Sciences. Retrieved 20 September 2020.
  8. James D. Williams (1975). "Systematics of the Percid Fishes of the Subgenus Ammocrypta, Genus Ammocrypta, with Descriptions of Two New Species". Bulletin of the Alabama Museum of Natural History (1): 1–56.
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