SUMMARY: We, the U.S. Fish and Wildlife Service (Service), announce a 90-day finding on a petition to list the giant Palouse earthworm (Driloleirus americanus) as threatened or endangered under the Endangered Species Act of 1973, as amended. We find that the petition does not provide substantial scientific or commercial information to indicate that listing the giant Palouse earthworm may be warranted. Therefore, we will not be initiating a status review in response to this petition. However, we encourage the public to submit to us any new information that becomes available concerning this species.
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Species Information
The giant Palouse earthworm was first described by Frank Smith in 1897 after he discovered it near Pullman, Washington: "* * * this species is very abundant in that region of the country and their burrows are sometimes seen extending to a depth of over 15 feet."
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Population Status
The petition stated that since the initial description of the giant Palouse earthworm, sightings have been extremely infrequent. In 2005, a University of Idaho graduate student conducting soil samples was the first person in nearly two decades to report a sighting of this earthworm (University of Idaho 2006, p. 1). Prior to this sighting, two specimens were collected in 1988 by University of Idaho researchers studying pill beetles in a forest clearing. A specimen was also collected by Fender in 1978 (Fender 1985, pp. 93--132). An indication of the species’ rarity is documented by Fauci and Bezdicek (2002, pp. 257--260); they surveyed earthworms at 46 sites in the Palouse bioregion without one collection of the giant Palouse earthworm.

This letter provides you with 60 days notice that the Center for Biological Diversity, the Palouse Prairie Foundation, the Palouse Audubon Society, the Friends of the Clearwater, Steve Paulson, David Hall and O. Lynne Nelson ("Petitioners") intend to sue the U.S. Department of the Interior, the Secretary of the Interior and the U.S. Fish and Wildlife Service (collectively "the Service") for violating Section 4 of the Endangered Species Act ("ESA"), 16 U.S.C. § 1533, and its implementing regulations, in failing to issue a 90-day finding or a 12-month finding regarding Petitioners’ petition requesting threatened or endangered listing for the Giant Palouse Earthworm (Driloleirus americanus). This letter is issued pursuant to the 60-day notice requirement of the citizen suit provision of the ESA. 16 U.S.C. § 1540(g).
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October 2, 2006

This letter responds to your petition dated August 18,2006, requesting the U.S. Fish and Wildlife Service emergency list the giant Palouse earthworm (Driloleirus americanus) and list this species as threatened or endangered pursuant to the Endangered Species Act of 1973, as amended (Act). We received your petition on August 30, 2006. When reviewing a petition, we must make an initial finding on whether the petition to add a species to the endangered species list presents substantial information indicating the requested action may be warranted. Section 4(b)(3)(A) of the Act requires, to the maximum extent practicable, this finding be made within 90 days.

We reviewed your petition to issue an emergency rule to list the giant Palouse earthworm. Our assessment is that circumstances pertaining to the status of the species do not warrant emergency listing. If conditions change, and we determine emergency listing is warranted, an emergency rule will be developed.

We are currently required to complete a significant number of listing and critical habitat actions in Fiscal Year 2006, pursuant to court orders and judicially approved settlement agreements. Complying with these court orders, settlement agreements, and other priorities obligates all of our listing and critical habitat funding for Fiscal Year 2006. Therefore, while we are not able to further address your petition to list the giant Palouse earthworm as endangered or, alternatively, as threatened, we will address your petition as soon as funding becomes available.

If you have any questions concerning this matter, please contact Ms. Theresa Rabot, Assistant Regional Director - Ecological Services at 503-231-6151.

Sincerely,

/s/ David J. Wesley
Acting Regional Director

The petitioners hereby formally petition to list the Giant Palouse Earthworm (Driloleirus americanus) as a threatened or endangered species pursuant to the Endangered Species Act (hereafter referred to as ESA), 16 U.S.C. §1531 et seq. This petition is filed under 5 U.S.C. 553(e) and 50 CFR 424.14 (1990), which grants interested parties the right to petition for issue of a rule from the Secretary of Interior.

Petitioners also petition that critical habitat be designated for the Giant Palouse Earthworm concurrent with the listing, pursuant to 50 CFR 424.12, and pursuant to the Administrative Procedures Act (5 U.S.C. 553).

The Giant Palouse Earthworm (Driloleirus americanus) is an endemic species of the Palouse bioregion that utilizes endangered Palouse prairie grassland habitat and nearby associated habitats. Habitat for this species has suffered extreme destruction and modification, due primarily to conversion of native grassland to non-native annual crops. Additionally, grazing, suburban and rural development, road construction and re-construction, and invasive species pose a threat to remaining degraded Palouse habitat and the species. Current and proposed management of the species either does not exist or is inadequate at the federal, state and local levels, to protect the species and its habitat. Without the designation of it as an Endangered Species, the Giant Palouse Earthworm faces an imminent threat to its continued existence in the Palouse bioregion.

University of Idaho graduate student Yaniria Sanchez-de Leon samples a Palouse Prairie remnant south of Moscow for earthworms. She found the rare giant Palouse earthworm at a different site north of Pullman, Wash. Photo by Yaniria Sanchez-de Leon/University of Idaho © 2005

The large, white worm at the top is the giant Palouse earthworm, Driloleirus americanus. Below is the southern worm or Aporrectodea trapezoides, which is considered an introduced species. Photo by Yaniria Sanchez-de Leon/University of Idaho © 2005

The anterior, ventral view of the giant Palouse earthworm specimen collected by Yaniria Sanchez-de Leon. The scale is in centimeters. Photo by Yaniria Sanchez-de Leon/University of Idaho © 2005

Sanchez-de Leon found the wriggler in May while digging soil samples for her research on the effects of earthworms on soil carbon dynamics of the Palouse grasslands. She paused when her shovel unveiled part of the off-white body of the Driloleirus americanus.

"I was really excited because it was something different," she said. Its size and coloring are distinct from common species.

She extracted two pieces of the worm from her field site at Washington State University's Smoot Hill Ecological Preserve and took them back to her office for identification. They measured 6 inches together, much longer than a common European worm.

Moscow-Pullman Daily News, Kate Baldwin. 2006.02.07. "Rare giant Palouse worm find for UI student; months of waiting end in confirmation of unique discovery." 33204.htm.

Timeline

• 2006.08.18: Petition to List Driloleirus americanus as a threatened or endangered species pursuant to the endangered species act.
• 2005.05.27: Washington State University's Smoot Hill Ecological Preserve near Palouse, Whitman County, WA. Palouse Prairie remnant: FEID/SYAL (Festuca-Symphoricarpos association) 10 cm down. Yaniria Sanchez-de Leon.
• 1986 or 1987: 11.2 km east of Moscow, Latah County, ID. Mesic forest, under moss layer. James Johnson and Paul Johnson.
In a relatively mesic area where the forest canopy was thin enough to permit abundant moss growth, back in the woods a way, researchers peeled up some moss looking for specimens of Byrrhidae, a moss-feeding family of beetles, and found a few of the worms. Found the worms in late May or early June. The weather was nice but the soil was still moist. They were at the surface under moss mats under a clump of fairly small conifer trees.
• 1978?: Moscow, Latah County, ID. Under a Douglas Fir, I think it was near Chipman Trail between Moscow and Pullman. William Fender.
• 1978?: At top of Lewiston Grade (U.S. 95). Under Hawthorn. William Fender.
• ????: Near Ellensburg [Fender & McKey-Fender 1990 quoted in James 2000]
• 1897: First reporting, near Pullman, WA. Frank Smith

"The giant Palouse earthworm lives in dry, rolling hills of Eastern Washington. Both the earthworms and farmers treasure the same bunchgrass prairie with its deep, fertile soils ... which doesn't bode well for the giants. They have similar burrowing habits to their Oregon cousins [it lives near the surface when conditions are moist and tunnels as deep as 15 feet when times are dry], but have evolved to tolerate the typically drier conditions of the Palouse. Hopefully they're still there, despite the land disturbance and invasion of non-native worms."
[http://roguepundit.typepad.com/roguepundit/2005/05/random_nature_2.html]

Subject: RE: Palouse natural history notes (non-bird)
From: Kelly Cassidy
Date: Wed, 01 Feb 2006 14:02:27 -0800

I was absolutely thrilled to see the article in the Spokesman this morning about the earthworm and ESPECIALLY that it was found on Smoot Hill. WSU administration makes periodic moves in bad budget times to talk about selling Smoot Hill. Being the only known worm location in the last 25 years should take Smoot Hill off the table for the foreseeable future.

Kelly Cassidy

2 - a WSU grad student found one [of] the rare Giant Palouse Earthworms at Smoot Hill Preserve west of Pullman last year. The last confirmed specimen was found in 1978. The Palouse, like many areas, is now populated primarily by non-native worm species.
[http://birdingonthe.net/mailinglists/INNW.html#1138831354]

1.4.3.3 Other Species
An overview of the Palouse subbasin wouldn't be complete unless the Palouse giant earthworm was mentioned. When Frank Smith first unearthed this giant earthworm near Pullman in 1897, he named it Megascolides americanus, thinking that it was closely related to Australia's fifteen-foot worms (Megascolides australis). Although dwarfed by its Australian counterpart, the three-foot long Palouse is certainly a giant among worms. This species, really only distantly related to Megascolides, was renamed Driloleirus which means "lily-like worm," reflecting the flowery aroma that it emits when handled (PBI 2004a).

Since its initial discovery, very few other sightings of this species have been documented. The giant Palouse earthworms live in the deep, rich soils of the Palouse bunchgrass prairies. Thick layers of organic matter that have accumulated in the soils of the Palouse for hundreds of years sustain the giants during the wetter seasons. During summer droughts, the worms dig burrows as deep as fifteen feet, conserving water with specialized kidney-like organs. Farmers that arrived in eastern Washington prized the fertile Palouse soils, resulting in the almost complete destruction of the bunchgrass prairies that characterized this region by the late 1800's. The biggest threat to these elusive giants continues to be habitat destruction due to agriculture and development, but the introduction of the now widespread European earthworm has also helped to further the decline of our native Palouse worm. A documented sighting of this rare creature has not been recorded since 1978, when one was unearthed in the Palouse country of Washington State (PBI 2004).
[www.nwcouncil.org/fw/subbasinplanning/palouse/plan/Plan.pdf]
[http://www.pacificbio.org/ESIN/OtherInvertebrates/GiantPalouseEarthworm/GiantEarthworm.html]

References and Links (academic):

• Fauci, Mary. April 2002. Palouse Giant Earthworm. Presented at the 2002 Palouse Prairie Symposium, Palouse Prairie Foundation, Moscow, ID.

  Frank Smith described it in 1897: "...this species is very abundant in that region of the country and that their burrows are sometime seen extending to a depth of over 15 feet."

• Niwa, Christine G.; Roger E. Sandquist, et al. 2001. USDA Forest Service Pacific Northwest Research Station. GTR 512. Invertebrates of the Columbia River Basin Assessment Area. [84 p; 669 KB]

  The [Columbia River] basin assessment area is inhabited by at least three native earthworm species, belonging to three genera (James 1995). Driloleirus americanus Smith was considered for inclusion in the International Union for the Conservation of Nature (IUCN) Invertebrate Red Data Book (Wells and others 1983) because its habitat was threatened and its range was not known to be large. The currently available information suggests it may be a narrow endemic utilizing a threatened habitat (grassland sites with good soil). The collection data give little detailed habitat information. The three sites (near Pullman and Ellensburg, Washington, and Moscow, Idaho, [Fender and McKey-Fender 1990]) are located in what is now agricultural land, grassland, and shrubland.

  The other two native species, Drilochaera chenowithensis McKey-Fender and Argilophilus hammondi McKey-Fender, may be somewhat tolerant of habitat conversion to agriculture. Learning more about their ranges and ecological flexibility would enable land managers to determine if special habitat protection measures are necessary. [p. 34]

  Table 5--Rare and endemic invertebrate species (continued) [p. 74]
  Driloleirus americanus: "L" -- recommended for listing. For reasons specified in the contract reports, these species are thought to need specific protection.

• James, Sam. 2000. USDA Forest Service Pacific Northwest Research Station. GTR 491. Earthworms (Annelida: Oligochaeta) of the Columbia River Basin Assessment Area. [24 p; 641 KB]

  Figure 1, (p. 4) shows collection points for native and exotic earthworms in the Columbia River basin.

  Fender indicates that five native genera are represented in the basin assessment area: Driloleirus, Drilochaera, Argilophilus, Arctiostrotus, and Macnabodrilus; however, only three species have been described. Driloleirus americanus is known from eastern Washington and western Idaho. Driloleirus americanus may be anecic [anecic worms inhabit a permanent or semi-permanent deep vertical burrow and emerge at night to consume relatively fresh plant detritus on the surface; these are the largest and longest-lived earthworms], based on its deep burrowing habits and largely organic diet. Drilochaera chenowithensis is known from only one site along the Columbia River at Chenowith Creek, west of The Dalles, Oregon (McKey-Fender 1970). Argilophilus hammondi has been found at the Chenowith Creek site and well to the south in the Ochoco National Forest... [p. 5]

  Management Issues: Biodiversity concerns: preservation of native species and alterations to the ecosystem caused by exotics -- The basin assessment area is inhabited by at least three native earthworm species belonging to three genera. All three should be of special concern. The giant earthworm, Driloleirus americanus, was considered for inclusion in Wells and others (1983) because its habitat was threatened and its range was small. Current information suggests that it may be a narrow endemic using a threatened habitat (shrubland sites with good soil). The collection data give little detailed information about habitat type. The three sites (near Pullman and Ellensberg, Washington, and Moscow, Idaho [Fender and McKey-Fender 1990]) are located in what is now agricultural land, grassland, and shrubland (CRB 001, 002). [p. 8]

  This leads to another area of concern to land managers: invasion by exotic species. Exotic earthworm species present in the basin assessment area are (thus far) all of European origin and are all members of the family Lumbricidae, with the exception of one species indigenous to America (Bimastos parvus). This invasion is a cause for concern for two reasons. First, these species may be able to outcompete native species. Replacement of native species by exotics has been observed in many parts of the world ... In general, native earthworms are vulnerable to habitat disturbance and invasion by exotic species (Kalisz and Dotson 1989). Large areas of intact habitat seem to be somewhat more resistant to native species loss, though the longterm outcome is not known. [p. 8]

• James, Sam. 1995. Interior Columbia Basin Ecosystem Management Project. Report on Columbia Basin Oligochaeta. [19 p; 135 KB]

  Special habitats: The only obvious special habitat is that of Driloleirus anrericanus, known from the native shrublands of eastern Washington and western Idaho. I have some recollection that the native vegetation of this region is scarce, and it is not known if the worm survives habitat conversion to agriculture. There is not enough information on other native species to tell if any others are similarly limited by habitat conditions. [p. 3]

• Pacific Biodiversity Institute, Winthrop, WA. Endangered Species Information Network. Giant Palouse Earthworm.

  Description: Large, pinkish-white earthworm up to two-feet long (smells like lilies)
  Threats: Habitat loss, non-native species
  Overview: When Frank Smith first unearthed this giant earthworm near Pullman in 1897, he named it Megascolides americanus, thinking that it was closely related to Australia's fifteen-foot worms (Megascolides australis). Although dwarfed by its Australian counterpart, the three-foot long Palouse [worm] is certainly a giant among worms. This species, really only distantly related to Megascolides, was renamed Driloleirus which means "lily-like worm," reflecting the peculiar flowery aroma that it emits when handled. Since its initial discovery, very few other sightings of this species have been documented. The giant Palouse earthworms live in the deep, rich soils of the Palouse bunchgrass prairies. Thick layers of organic matter that have accumulated in the soils of the Palouse for hundreds of years sustain the giants during the wetter seasons. During summer droughts, the worms dig burrows as deep as fifteen feet, conserving water with specialized kidney-like organs, called nephridia. Farmers that arrived in eastern Washington prized the fertile Palouse soils, resulting in the almost complete destruction of the bunchgrass prairies that characterized this region by the late 1800's. Today, the Palouse prairies are considered to be the rarest ecosystem in Washington. The biggest threat to these elusive giants continues to be habitat destruction due to agriculture and development, but the introduction of the now widespread European earthworm has also helped to further the decline of our native Palouse worm. A documented sighting of this rare creature has not been recorded since 1978, when one was unearthed in the Palouse country of Washington State.

• http://www.sw-center.org/swcbd/Programs/policy/esa/essa-Table2.pdf
• Washington State University. Ask Dr. Universe -- In search of...the giant Palouse earthworm. [page 2 3 4]

  In 1999, "Dr. Universe" embarked on the first ever Dr. Universe Expedition, in search of the Giant Palouse Earthworm. Armed with shovels, fifteen intrepid grade 1-3 kids and four scientists (Mary Fauci and Dave Bezdicek, soil ecologists, Paul Schroeder, zoologist, and Ann Kennedy, soil microbiologist), headed out to a very special spot outside of town to look for these worms. [5]

• The IUCN Red List of Threatened Species.

  Kingdom ANIMALIA
    Phylum ANNELIDA
      Class OLIGOCHAETA
        Order HAPLOTAXIDA
           Family MEGASCOLECIDAE
             Genus Driloleirus
               Species americanus
  

  Red List Category: VU D2. Assessed: 1996. Assessor: World Conservation Monitoring Centre.

• Fender, W.M.; D. McKey-Fender. 1990. Oligochaeta: Megascolecidae and other earthworms from western North America. In: Dindal, D.L., ed. Soil biology guide. New York: Wiley and Sons.