Species of Greatest Conservation Need

**Species of Greatest Conservation Need** (Updated: 06/16/2025)
Scientifc Name	Common Name	Taxonomic Group	SGCN Status	Federal Status	State Status	Global Rank	State Rank	Endemic	General Habitat Type(s)
Procloeon distinctum	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1G3Q	S2?	Yes	Mayflies distinguished by aquatic larval stage; adult stage generally found in shoreline vegetation
Protoptila arca	San Marcos saddle-case caddisfly	Invertebrates	Yes	Not Listed	Not Listed	G1	S1	Yes	Known from an artesian well in Hays County; locally very abundant; swift, well-oxygenated warm water about 1-2 m deep; larvae and pupal cases abundant on rocks
Protoptila balmorhea	Balmorhea saddle-case caddisfly	Invertebrates	Yes	Not Listed	Not Listed	G1	S1	No	Oviparous; larvae make turtle-shaped cases of small pebbles attached to the underside of stones in swift-flowing streams and rivers
Pseudocentroptiloides morihari	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G2G3	S2?	Yes	Mayflies distinguished by aquatic larval stage; adult stage generally found in shoreline vegetation
Pseudosubulina cheatumi	Chisos foxsnail	Invertebrates	Yes	Not Listed	Not Listed	G1	S3	Yes	Habitat description is not available at this time.
Pseudotryonia adamantina	Diamond Y springsnail	Invertebrates	Yes	E 08/08/2013	E 03/23/2015	G1	S1	Yes	Endemic; aquatic snail only known from a spring system and associated outflows in Pecos County; mud substrates on the margins of small springs and seeps, and marshes in flowing water associated with sedges and cattails; presumed to be fine particle feeders of detritus and periphyton within substrate
Psychopomporus felipi	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	GNR	S1	Yes	Spring obligate. Known only from San Felipe Springs, Val Verde County. Fine scale habitat requirements unknown.
Pygarctia lorula	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G2G3	S2?	Yes	Habitat description is not available at this time.
Pyractomena vexillaria	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1	SH	Not Evaluated	Habitat description is not available at this time.
Pyrgulopsis davisi	Limpia Creek spring snail	Invertebrates	Yes	Not Listed	T 03/30/2020	G1	S1	Yes	Freshwater; in and on mud and rocks among patches of watercress in spring-fed rivulets
Pyrgulopsis ignota	Caroline's springs pyrg	Invertebrates	Yes	Not Listed	T 03/30/2020	G1	S1	Yes	Spring obligate. Known only from Caroline Springs in Terrell County. Fine scale habitat requirements unknown.
Pyrgulopsis metcalfi	Presidio County spring snail	Invertebrates	Yes	Not Listed	T 03/30/2020	G1	S1	No	Found in the outflows of springs (24 degrees C) in fine mud and dense watercress
Pyrgulopsis texana	phantom springsnail	Invertebrates	Yes	E 08/08/2013	E 03/23/2015	G1	S1	Yes	Endemic aquatic snail; known only from three spring systems and associated outflows in Jeff Davis and Reeves counties; vulnerable to reduction of springflow resulting from declining levels of groundwater
Quadrula quadrula	mapleleaf	Invertebrates	Yes	Not Listed	Not Listed	G5	S3	No	Reported from streams to rivers, lakes, and reservoirs. In riverine habitats, it may be found in main-channel habitats such as riffles or runs in sand, gravel, and cobble substrates with moderate to swift currents. May also be found in nearshore habitats such as banks and backwaters to include pools in sand or mud substrates with little to no flow. (Williams et al. 2008; Howells 2016; Haag and Cicerello 2016).
Rhadine austinica	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1G2	S2	Yes	Habitat description is not available at this time.
Rhadine exilis	No accepted common name	Invertebrates	Yes	E 12/26/2000	Not Listed	G3	S1	Yes	Small, essentially eyeless ground beetle; karst features in north and northwest Bexar County
Rhadine infernalis	No accepted common name	Invertebrates	Yes	E 12/26/2000	Not Listed	G2G3	S1	Yes	Small, essentially eyeless ground beetle; karst features in north and northwest Bexar County
Rhadine infernalis ewersi	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G2G3T1	S1	Yes	Habitat description is not available at this time.
Rhadine infernalis infernalis	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G2G3T2T3	S3	Yes	Habitat description is not available at this time.
Rhadine insolita	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1G2	S1	Yes	Habitat description is not available at this time.
Rhadine koepkei	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1	S1	Yes	Habitat description is not available at this time.
Rhadine noctivaga	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1G2	S1	Yes	Habitat description is not available at this time.
Rhadine persephone	Tooth Cave ground beetle	Invertebrates	Yes	E 09/16/1988	Not Listed	G1G2	S1	Yes	Resident, small, cave-adapted beetle found in small Edwards Limestone caves in Travis and Williamson counties
Rhadine russelli	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G1G2	S3	Yes	Habitat description is not available at this time.
Rhadine speca	No accepted common name	Invertebrates	Yes	Not Listed	Not Listed	G2	S2	Yes	Habitat description is not available at this time.