Pyrgulopsis castaicensis
Hershler and Liu, 2010
Middle Canyon Spring Pyrg
G1Critically ImperiledGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.838190
Element CodeIMGASJ0G90
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single state or province
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderLittorinimorpha
FamilyHydrobiidae
GenusPyrgulopsis
Concept ReferenceHershler, R. and H.-P. Liu. 2010. Two new, possibly threatened species of Pyrgulopsis (Gastropoda: Hydrobiidae) from southwestern California. Zootaxa 2343:1-17.
Conservation Status
Review Date2010-04-07
Change Date2010-04-07
Edition Date2010-04-07
Edition AuthorsCordeiro, J.
Threat ImpactUnknown
Range Extent<100 square km (less than about 40 square miles)
Number of Occurrences1 - 5
Rank ReasonsThis species was recently described as an endemic to Middle Canyon Spring (Santa Clara River drainage) in Los Angeles Co., California, in an area slated for development however the resource management plan incorporates an adaptive management framework to ensure protection of the spring habitat and CA Fish and Game is overseeing the development.
Range Extent CommentsThis species was recently described as an endemic to Middle Canyon Spring (Santa Clara River drainage) in Los Angeles Co., California (Hershler and Liu, 2010).
Occurrences CommentsThis species was recently described as an endemic to Middle Canyon Spring, 1.4 km southwest of Castaic Junction in Los Angeles Co., California (Hershler and Liu, 2010).
Threat Impact CommentsThe single known locality is located along the northeastern edge of a property slated for development but the resource management plan incorporates an adaptive management framework to ensure protection of the spring habitat and the California Department of Fish and Game is overseeing the implementation of the plan and conservation program associated with the development. Nevertheless, the species may be threatened by the extensive alteration of local topography and watershed associated with this development (Hershler and Liu, 2010).
Ecology & Habitat
Description
A full description is in Hershler and Liu (2010). A small species of Pyrgulopsis having a medium-spired, sub-globose to narrow-conic shell with medium to highly convex whorls. Penis having a small lobe and short filament; penial ornament consisting of a well developed terminal gland.
Diagnostic Characteristics
From Hershler and Liu (2010):
Pyrgulopsis castaicensis is distinguished from P. micrococcus by its larger terminal gland (on the penis), simple oviduct coil (lacking a proximal kink or loop), more anteriorly positioned seminal receptacle, and mtCOI sequences (6.1-9.3% divergence). Pyrgulopsis castaicensis is differentiated from P. stearnsiana by its more convex teleoconch whorls, larger penial lobe, larger terminal gland, simple oviduct coil, shorter pallial section of albumen gland and smaller (relative to bursa copulatrix) seminal receptacle. Pyrgulopsis castaicensis was most similar in its mtCOI sequences to P. stearnsiana from the San Francisco Bay area (3.50% divergence) among all of the samples included in our study and differed from other specimens of this species by 3.8-8.2%. This level of sequence divergence falls within the range previously documented for >60 other species of Pyrgulopsis (1.1-
13.1%).
Habitat
It is endemic to a Middle Canyon Spring; a small, shallow spring-fed stream situated on a terrace of the Santa Clara River and shaded by a tall canopy of dense riparian vegetation where individuals are abundant on plant debris and the sandy bottom of the stream (Hershler and Liu, 2010).
Other Nations (1)
United StatesN1
| Province | Rank | Native |
|---|
| California | SNR | Yes |
References (2)
- Freshwater Mollusk Conservation Society (FMCS). 2021. The 2021 checklist of freshwater gastropods (Mollusca: Gastropods) of the United States and Canada. Considered and approved by the Gastropods Names Subcommittee December 2020. Online: https://molluskconservation.org/MServices_Names-Gastropods.html
- Hershler, R. and H.-P. Liu. 2010. Two new, possibly threatened species of <i>Pyrgulopsis </i>(Gastropoda: Hydrobiidae) from southwestern California. Zootaxa 2343:1-17.