Ringed Crayfish

Faxonius neglectus neglectus

Description:

Adults rarely exceed 100 mm in total length. The carapace is egg-shaped, nearly equal in length to the abdomen, and the areola is open. The rostrum has a trough-like depression and thick lateral margins, which abruptly narrow into a well-defined acumen. Chelae are broad and heavy, especially in form I males where there is a wide gap between the fingers when they are closed. In form I males, gonopods terminate in two slender processes and curve towards each other such that their tips nearly touch. In females, the annulus ventralis has a slitlike fossa that reaches under the anterior margin

Virile Crayfish

Faxonius virilis

Description:

Adults rarely exceed 130 mm in total length. The carapace is slightly longer than the abdomen and the areola is open. The rostrum is moderately broad with a trough-like depression, and lateral margins are thick and set off by spines from the acumen. Chelae have prominent tubercles along the inner margins. In form I males, gonopods terminate in two long slender processes and the central projection is longer and gently curved, while the mesial process is shorter and curved in same direction as central projection with a distinct space between the two. In females, the annulus ventralis is rounded on the posterior margin, without any triangular posterior extensions

Neosho Midget Crayfish

Faxonius macrus

Description:

Adults rarely exceed 50 mm in total length. The carapace is nearly equal in length to the abdomen. The rostrum is narrow with a well-developed trough-like depression. Chelae are short, broad, and look oversized relative to body size. In form I males, gonopods have two long, slender, and slightly curved processes that reach the base of the first pair of pereiopods. In females, the annulus ventralis has a deep fossa

Midget Crayfish

Faxonius nana

Description:

Adults rarely exceeds 50 mm in total length. The carapace is nearly equal in length to the abdomen. The rostrum is narrow with a well-developed trough-like depression. Chelae are short but broad and look oversized relative to body size. In form I males, gonopods have two long, slender, and slightly curved processes that reach the base of the second pair of pereiopods. In females, the annulus ventralis has a deep fossa

Western Painted Crayfish

Faxonius palmeri longimanus

Description:

Adults rarely exceed 80 mm in total length. The rostrum has a trough-like depression and well-developed lateral margins and spines. The areola is closed. In form I males, gonopods terminate in two long and slender processes that are curved caudally and the mesial process ends in a spoon-shaped tip. In females, the annulus ventralis is deep with a slit-like fossa at its anterior half. The posterior margins of the annulus ventralis are thick and inflated

White River Crayfish

Procambarus acutus

Description:

Adults rarely exceed 140 mm in total length. The carapace is laterally compressed with small tubercles along the sides giving it a granular texture, and the areola is open. The rostrum is moderately excavated and the acumen is short and separated from the rostrum by spines or tubercles. Chelae are slender and densely covered with tubercles. In form I males, gonopods have four short processes, three of which are strongly curved laterally to the midline. The gonopods do not have a prominent shoulder. In females, the fossa of the annulus ventralis is located to the right of body midline and partially covered by the largest of three tubercles present

Red Swamp Crayfish

Procambarus clarkii

Description:

Adults rarely exceed 160 mm in total length. The carapace is laterally compressed with small tubercles running along its sides and the areola is closed. The rostrum has a trough-like depression with thick lateral margins and spines extending from the acumen. Chelae are slender and are covered in tubercles, with the largest occurring along the inside margins of the palms. In form I males, gonopods have four short, blade like terminal processes that strongly curve laterally to the midline. Gonopods also have a shoulder on the cephalic surface. In females, the annulus ventralis lacks a definite fossa, but has two anterior tubercles

Little River Creek Crayfish

Faxonius

leptogonopodus

Description:

Adults rarely exceed 80 mm in total length and the areola is open. The rostrum has a slight depression and lateral spines and margins that are slightly thickened. Chelae are somewhat broad and have a thick or inflated palm region. In form I males, gonopods are slender with the central process consisting of at least 1/2 of the total length

Swamp Dwarf Crayfish

Cambarellus puer 

Description:

The body size of adults rarely exceeds 37 mm in total length. Females are typically slightly larger than males. The carapace is laterally compressed and moderately arched dorsoventrally with strong cervical spines and areola is open. The rostrum is flat and terminates in small spines at base of the acumen. The acumen is equal to or slightly longer than the width of the rostrum at the marginal spines. Chelae are small and slender with short fingers. The fingers and palm have rounded mesial and lateral margins with single setae covering dorsal surfaces, but lack longitudinal ridges and rows of tubercles. The dactyl is equal in length or shorter than the mesial margin of palm. In form I males, gonopods terminate in three caudodistally recurved elements of moderate and equal length. In females, the annulus ventralis is movable, subcircular, with a flattened or shallowly notched caudal edge, and has a strongly elevated central region (Taylor & Schuster, 2004). 

Devil Crawfish

Cambarus diogenes

Description:

A stout crayfish with broad chelae that rarely exceeds 127 mm in total length. The carapace is approximately equal in length to the abdomen and somewhat laterally compressed. The head is narrower than the thorax and the areola is closed. The rostrum is broad and deeply excavated with a short acumen that lacks spines or tubercles. The lateral edge of the second abdominal segment is arched. Chelae are large and heavy with the dactyl just longer than the palm length. The dactyl has a broad notch at the base, which is most prominent in form I males. In form I males, central projection of the gonopod is corneous, recurved approximately 90° to the shaft, short, and bladelike. In females, the cephalic margin of the annulus ventralis is broadly rounded, while the caudal margin is triangular and has a deep horizontal fossa

Painted Devil Crayfish

Cambarus ludovicianus 

Description:

Adults rarely exceed 94 mm in total length. The carapace is approximately equal in length to the abdomen, bullet shaped in dorsal view, and laterally compressed. The head is narrower than the thorax and the areola is closed. The rostrum is broad and deeply excavated with a short acumen that lacks spines or tubercles. The lateral edge of the second abdominal segment is straight. Chelae are large and heavy, with the dactyl about twice as long as the palm length. The dactyl has a broad notch at the base, which is most prominent in form I males. In form I males, the central projection of the gonopod is corneous, recurved approximately 90° to shaft, short, and bladelike. In females, the annulus ventralis is subrhombodial in outline, and the cephalic and caudal margins are broadly rounded. A deep circular central area and oval fossa are also present in the annulus ventralis

Delaware County Cave Crayfish

Cambarus subterraneus

Description:

A white (albinistic) crayfish with small, unpigmented eyes, and long slender chelae. Adults rarely exceed 50 mm in total length. The carapace lacks cervical spines. The rostrum is broadest at its base and exhibits small marginal spines. The body surface and pereiopods are covered in conspicuous stiff setae, which likely serve as sensory organs in the dark cave environment. In form I males, the gonopods terminate in two terminal processes recurved at angles greater than 90°, and the central projection is moderately long and slender. In females, the annulus ventralis is subsymmetrical in outline, and the caudal part is slightly movable. The cephalic half of the annulus ventralis is traversed by a deep submedian longitudinal trough 

Oklahoma Cave Crayfish

Cambarus tartarus 

Description:

A white (albinistic) crayfish with small, unpigmented eyes, and long slender chelae. Adults rarely exceed 50 mm in total length. The carapace is lacking cervical spines and is subcylindrical. The rostrum is the broadest at the base and has small marginal spines. The body and pereiopods are covered in conspicuous stiff setae. In form I males, gonopods terminate in two terminal processes, both recurved at angles greater than 90°. The central projection is short, heavy, and does not taper. In females, the annulus ventralis is symmetrical with the caudal portion somewhat movable 

Digger Crayfish

Fallicambarus fodiens 

Description:

A heavy-bodied crayfish with broad chelae that rarely exceeds 80 mm in total length. The rostrum is broad and moderately excavated with no rostral spines. The acumen is very short with thinner margins than found on the rostrum. The areola is closed. Chelae are nearly oval or egg-shaped in outline, dorsoventrally flattened at the base of the fingers, and with a distinct basal notch on dactyl and dense patch of setae at base of propodus. There is a gap at the area of the notch when fingers are closed. In form I males, gonopods have two terminal processes that are at right angles to the main gonopod axis, and the primary process is strongly curved and bladelike. In females, the annulus ventralis is subcircular in outline and slightly asymmetrical with a deep medial trough through cephalic half

Blair's Fencing Crayfish

Faxonella blairi

Description:

 A small bodied crayfish with a bullet shaped carapace tapering towards the head that rarely exceeds 50 mm in total length. The rostrum is broad and without lateral spines or tubercles. The areola is open. Chelae are narrow and cylindrical with short abruptly tapering fingers that are shorter than palm length. In form I males, gonopods terminate in two terminal processes and the central projection of the gonopod is long, conspicuous, and reaches the base of the first pereiopods. Mesial process is long and thin. In ventral view, the gonopods cross each other. In females, the annulus ventralis is fused to the sternum with two prominent knobs on its anterior margin

Ditch Fencing Crayfish

Faxonella clypeata

Description:

A small bodied crayfish with a bullet shaped carapace tapering towards the head that rarely exceeds 50 mm in total length. The rostrum is broad and without lateral spines or tubercles and the areola is open. Chelae are narrow and cylindrical with short abruptly tapering fingers that are shorter than the palm’s length. In form I males, gonopods end in two terminal processes and the central projection is long and conspicuous, but does not reach the base of the first pereiopods. The mesial process is short and thick. In ventral view, the gonopods cross each other. In females, the annulus ventralis is freely movable, not fused to sternum, and has two prominent knobs on its anterior margin

Western Plains Crayfish

Faxonius causeyi

Description:

Adults rarely exceed 100 mm in total length. The carapace is stocky, subovate, depressed, and the areola is open. The abdomen is slightly shorter than the carapace. The rostrum is long, excavate, and margins converge with weak lateral spines. Chelae are large with tubercles along mesial margin of palm and dactyl. In form I males, gonopods reach the base of second pereiopods and terminate in two processes. The central projection of gonopods is corneous, long, and slightly recurved caudally, while the mesial processes are noncorneous, slender, and shorter than the central projection. In females, the annulus ventralis is immovable and spindle-shaped

Conchas Crayfish

Faxonius deanae

Description:

Adults rarely exceed 85 mm in total length. The rostrum has distinct spines, a slight central depression, and the areola is closed. Chelae are long and slender, and the dactyl is nearly twice as long as the palm. In form I males, gonopods terminate in two strongly curved processes. The central projection is bent at a 45° angle to the shaft, and the mesial process bent at a 90° angle to shaft. In females, the annulus ventralis is sub elliptical and is wider than long 

Painted Crayfish

Faxonius difficilis

Description:

Adults rarely exceed 80 mm in total length. The carapace is robust, depressed, and the areola is closed. The rostrum has prominent lateral spines and a pointed acumen that is shorter than the basal portion. Chelae are triangular and flattened, often as long as the carapace in form I males. In form I males, gonopods are short, stout with central and mesial processes that are short and blunt. In females, the annulus ventralis is diamond shaped

Shrimp Crayfish

Faxonius lancifer

Description:

Adults rarely exceed 76 mm in total length. The carapace has strong cervical spines, is nearly equal in length relative to the abdomen, and the areola is closed. The rostrum has a deep trough-like depression, and the margins are nearly straight terminating in spines or tubercles at the base of an extremely long acumen. Chelae are slender with short fingers, dactyl shorter than the length of the palm, and they are lacking longitudinal ridges and tubercles. In form I males, gonopods terminate into two very short processes. The mesial process is non-corneous and equal in length or slightly longer than central projection. In females, the annulus ventralis lacks a well-developed fossa

Mena Crayfish

Faxonius menae

Description:

Adults rarely exceed 80 mm in total length and the areola is open. The rostrum is wide with convex margins and blunt lateral spines. Chelae are deeply punctate dorsally and ventrally, and fingers have deep longitudinal grooves. In form I males, gonopods terminate in two long processes, with the central projection corneous and bent caudally at the tip. In females, the annulus ventralis is nearly spherical with tubercles on either side of sinus, and the fossa is median and deep

Meek's Short Pointed Crayfish

Faxonius meeki brevis

Description:

Adults rarely exceed 60 mm in total length. The carapace is subovate, slightly depressed, and the areola is open. The rostrum is divergent at the base and is slightly ridged dorsally, while the acumen is blunt and lacking lateral spines. In form I males, gonopods terminate in two slender processes both curved caudally at 90° to the shaft. In females, the annulus ventralis is firmly fused to sternum

Water Nymph Crayfish

Faxonius nais

Description:

Adults rarely exceed 130 mm in total length. The carapace is smooth, lightly punctate dorsally, granulate laterally, and the areola is open. The abdomen is nearly the same length as the carapace. The rostrum is long, centrally depressed, and has lateral margins converging into small but distinct spines. Chelae are broad, flattened, and long. The fingers are long with tubercles along the mesial margins of palm and dactyl. Tubercles also line the inner margin on the non-movable finger, and long setae are present at the base of the fingers. In form I males, gonopods terminate in two slender processes, and the mesial process curves the entire length of the gonopod. In females, the annulus ventralis is triangular with a median longitudinal fissure

Kiamichi Crayfish

Faxonius saxatilis

Description:

Adults rarely exceed 60 mm in total length. The carapace has no cervical spines or tubercles and the areola is open. The rostrum has a central depression and marginal spines. Chelae have two subserrate rows of small tubercles along the mesial margin. In form I males, gonopods terminate in two processes which reach the base of the first pair of pereiopods when the abdomen is flexed. In females, the annulus ventralis is symmetrical with the cephalic half divided by a medial trough 

Red River Burrowing Crayfish

Procambarus curdi

Description:

Adults rarely exceed 100 mm in total length. The carapace is ovate with reduced or no cervical spines and the areola is open. The rostrum is lacking lateral spines and has a short acumen with a troughlike depression. Chelae are subcylindrical, long, and the mesial surface of palm has tubercles. In form I males, gonopods reach the base of the third pereiopods and terminate in four terminal processes. Central projection is corneous, subtriangular, and flattened lateromesially. In females, annulus ventralis is subovate, and the cephalic half has a broad V-shaped trough

Southwestern Creek Crayfish

Procambarus dupratzi

Description:

Adults rarely exceed 100 mm in total length. As a member of the subgenus Pennides, P. dupratzi is the only known crayfish in Oklahoma to have two cervical spines. The rostrum is rather long with prominent lateral spines. Chelae are narrow and cylindrical. Fingers are approximately the same length as the palm. In form I males, the mesial process is slender and directed approximately 90° to shaft. The caudal knob is poorly developed and pentastyle is absent (Walls, 2009). In females, the annulus ventralis has median sinus and is partially covered by tubercles on anterior end

Prairie Crayfish

Procambarus gracilis

Description:

Adults rarely exceed 85 mm in total length. The carapace is dome shaped, longer than the abdomen, and the areola is closed. Chelae are broad, powerful, and have a notch near the base of the dactyl, and lack tubercles except along inside margins of the dactyl and the palm. In form I males, gonopods have four short processes, with the longest process being slender, slightly curved, and tapering into a sharp tip. In females, the annulus ventralis is round in outline and has a deep fossa on either side of the midline

Osage Burrowing Crayfish

Procambarus liberorum

Description:

Adults rarely exceed 90 mm in total length. The carapace has no cervical spines or tubercles, and the areola is closed. The rostrum has gently curving margins, lacks marginal spines, and the acumen is barely present. Chelae are blunt, heavy, and tubercles line the mesial margins of the palm and dactyl. In form I males, gonopods extend to the base of the third pereiopods, terminate in four processes, and have a strong rightangled shoulder at base of central projection. The central projection terminates distally and is directed slightly caudolaterally. In females, the annulus ventralis is deeply excavated in the cephalomedian half and has surrounding margins with spines or tubercles

Southern Plains Crayfish

Procambarus simulans

Description:

Adults rarely exceed 100 mm in total length. The carapace is ovate and narrows towards the rostrum, is granulate laterally, and the areola is open. The rostrum is broad and deeply excavated with strong margins and no lateral spines. Chelae are long and slender. The surface of the chelae is dentate, with tubercles lining the mesial margins of palm and dactyl. In form I males, gonopods are thick and straight with four short processes. Central projection is straight, and caudal process is narrow. In females, the annulus ventralis has two tubercles on the anterior end

Ouachita Mountain Crayfish

Procambarus tenuis

Description:

. Adults rarely exceed 125 mm in total length. The carapace is strongly compressed, and the areola is very narrow and nearly closed. The boss on the coxae of the fourth pereiopod is greatly expanded ventrally. The rostrum does not have lateral spines. Chelae are stout and oval in shape, and palms have a row of 7 to 9 tubercles lining their mesial surface. In form I males, gonopods terminate in three processes and the central projection is corneous and the most prominent of the processes, while the mesial process is thin, triangular, and directed caudally at nearly a 90° angle with the axis of shaft