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Terrestrial Mollusks MANAGEMENT RECOMMENDATIONS FOR SURVEY AND MANAGE TERRESTRIAL MOLLUSKS Version 2.0 By Thomas E. Burke John S. Applegarth Ted R. Weasma Editor Nancy Duncan October 1999 MANAGEMENT RECOMMENDATIONS FOR TERRESTRIAL MOLLUSKS Version 2.0 Section No. Ancotrema voyanum .......................Hooded Lancetooth ...............1 Cryptomastix hendersoni ...................Columbia Oregonian ..............2 Deroceras hesperium .......................Evening Fieldslug .................3 Helminthoglypta hertlieni ...................Oregon Shoulderband .............4 Helminthoglypta talmadgei .................Trinity Shoulderband ..............5 Hemphillia burringtoni .....................Burrington Jumping-slug ...........6 Hemphillia glandulosa .....................Warty Jumping-slug ...............6 Hemphillia malonei .......................Malone Jumping-slug ..............6 Hemphillia pantherina ......................Panther Jumping-slug ..............6 Monadenia (Shastelix) chaceana .............Chace Sideband ..................7 Monadenia (Shastelix) churchi ...............Klamath or Church's Sideband .......8 Monadenia fidelis minor ....................Dalles Sideband ..................9 Monadenia fidelis ochromphalus .............Yellow-base Sideband ...........10 Monadenia fidelis klamathica ................Oak flat or Klamath Sideband ......10 Monadenia (Shastelix) troglodytes troglodytes ...Shasta Sideband ................11 Monadenia (Shastelix) troglodytes wintu .......Wintu Sideband .................11 Oreohelix n. sp. ...........................Chelan Mountainsnail .............12 Pristiloma Arcticum Crateris ................Crater Lake Tightcoil .............13 Trilobopsis tehamana ......................Tehama Chaparral ...............14 Trilobopsis roperi .........................Shasta Chaparral ................14 Vertigo n. sp. .............................Hoko Vertigo ...................15 Vespericola pressleyi .......................Big Bar Hesperian ...............16 Vespericola shasta .........................Shasta Hesperian ................17 October 1999 SECTION NO. 1 Ancotrema voyanum Hooded Lancetooth Management Recommendations for Ancotrema voyanum, the Hooded Lancetooth (land snail) V. 2.0 by John S. Applegarth February 1999 TABLE OF CONTENTS EXECUTIVE SUMMARY ......................................... 1 I. NATURAL HISTORY ....................................... 2 A. Taxonomic/Nomenclatural History ............................ 2 B. Species Description ..................................... 3 1. Morphology ..................................... 3 2. Reproductive Biology ............................... 4 3. Ecology ........................................ 5 C. Range, Known Sites ..................................... 5 D. Habitat Characteristics and Species Abundance .................... 6 II. CURRENT SPECIES SITUATION .............................. 7 A. Why Species is Listed under Protect Sites from Grazing Standard and Guideline ................................... 7 B. Major Habitat and Viability Considerations ...................... 8 C. Threats to the Species .................................... 8 D. Distribution Relative to Land Allocations ....................... 9 III. MANAGEMENT GOALS AND OBJECTIVES ..................... 9 A. Management Goals for the Taxon ............................ 9 B. Specific Objectives ..................................... 10 IV. HABITAT MANAGEMENT ................................. 10 A. Lessons from History ................................... 10 B. Identification of Habitat Areas for Management .................. 10 C. Management Within Habitat Areas .......................... 11 D. Other Management Issues and Considerations ................... 11 V. RESEARCH, INVENTORY, AND MONITORING NEEDS ............ 12 A. Data Gaps and Information Needs ........................... 12 B. Research Questions .................................... 13 C. Monitoring Needs and Recommendations ...................... 13 VI. REFERENCES ........................................... 13 APPENDIX A ................................................ 16 EXECUTIVE SUMMARY Species: Ancotrema voyanum (Newcomb, 1865) — Hooded Lancetooth (land snail) Taxonomic Group: Mollusks ROD Components: Protect Sites From Grazing Other Management Status: None. Range: Ancotrema voyanum is primarily known from northern Trinity County, California. In addition there are credible records for 2 disjunct locations, one in Humboldt County and one in Siskiyou County. Most records are from the Shasta-Trinity National Forests where this species is known from the Big Bar and Weaverville Ranger Districts and is suspected to occur in the Hayfork Ranger District. In the Six Rivers National Forest there are 3 records from the Lower Trinity Ranger District and one from the Orleans Ranger District. In the Klamath National Forest there is one record from the Ukonom Ranger District, and this species is suspected to occur in the Happy Camp Ranger District. Specific Habitat: This land snail is known from intermediate elevations, 168-960 m (550-3150 feet), where it seems to be limited to the vicinity of perennial and intermittent streams. This snail seems (1) to depend on perennial subsurface dampness, (2) to be favored by late- successional conditions including old coarse woody debris, leaf mold of riparian hardwoods, and a relatively closed canopy, and (3) is possibly favored by substrates that contain limestone. Threats: The primary threat to this species seems to be the degradation of habitat resulting from the impacts of grazing by domestic livestock. Additional possible threats come from wildfire, direct impact of prescribed fire, applied chemicals, invasion by exotic species, reduction of riparian canopy and woody debris, and concentrated recreational activities. Management Recommendations: This is a riparian-dependent species that needs complete protection from the negative impacts of domestic livestock, which is not available under the Aquatic Conservation Strategy. If an exclosure is needed to protect identified Habitat Areas, a suggested model extends the width of the Riparian Reserve, 400 m (1/4 mile) upstream and 60 m (200 feet) downstream. For locations that are not precisely defined, a field review and a larger area may be needed to ensure adequate protection. Information Needs: The distribution of this species is poorly known, its ecological relationships are largely unknown, and its responses to the protection of sites from livestock grazing and to other management activities need to be monitored to assess compliance with the standard and guideline and to verify the continued presence of this species. Ancotrema voyanum - Page 1 I. NATURAL HISTORY A. Taxonomic/Nomenclatural History Ancotrema voyanum is in the family Haplotrematidae, which was named and defined anatomically by Baker (1925) and which originally included only the genus Haplotrema in the broad sense (Baker 1931). Pilsbry (1946) and recent taxonomic authorities (Solem 1978; Burch and Pearce 1990; Smith et al. 1990; Roth 1990 and 1991) have continued to recognize the Haplotrematidae and to place this family in the superfamily Rhytidoidea (or Rhytidacea), order (or suborder) Sigmurethra, and subclass Pulmonata. The genus Ancotrema was proposed by Baker (1931) as a subgenus of Haplotrema with Helix sportella Gould (1846) as the type species. Ancotrema was treated as a subgenus by Pilsbry (1946) but recently elevated to a full genus by Roth (1990), who recognized 4 species in this genus. This arrangement is used by Turgeon et al. (1998). This species was originally named as Helix (Macrocyclis) voyana by Newcomb (1865). Tryon (1866) and others treated Macrocyclis as a full genus with this species included. Ancey (1882) moved this species to the genus Selenites, and Pilsbry (1898) placed it in Circinaria before Baker (1931) moved it to Haplotrema (Ancotrema). Roth (1990) and subsequent authors use Ancotrema voyanum as the valid name for this species. Newcomb (1865) did not designate a holotype. The Newcomb collection is in the Paleontology Research Institute at Cornell University. Under CU number 27961 there are 7 shells labeled as “cotypes” (= syntypes). Six are this species, and the odd shell is Haplotrema keepi (Barry Roth, personal communication). Until someone formally selects one specimen in the syntype series as the lectotype, there is a risk that someone might mistakenly designate the odd shell as the lectotype of Ancotrema voyanum and thereby create a taxonomic dilemma. Some other shells, thought to have been collected at the same time and place (part of the original series), are in the California Academy of Sciences (CAS 051593 and unnumbered) but, because they are not known to be syntypes, presumably they will not be considered for selection of the lectotype. The type locality cannot be precisely defined. The location description with the syntype series is “Cañon Creek, Trinity County, California.” Canyon Creek (formerly Cañon Creek) runs south from the Canyon Creek Lakes to Junction City where it joins the Trinity River, an airline distance of roughly 27 km (17 miles). The original series of snail shells was collected along Canyon Creek roughly around the year 1860 by C. D. Voy (for whom this species is named). Voy was a collector of minerals, shells, and fossils in the California gold fields (Roth, personal communication). Hydraulic gold mining altered the bed of Ancotrema voyanum - Page 2 Canyon Creek from its mouth to the vicinity of Dedrick, a distance of roughly
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