Cambarus manningi Hobbs 1981

Cambarus (Hiaticambarus) manningi

Cambarus longulus longirostris.—James, 1966:12 [in part: map based on list of localities deposited in the Smithsonian Institution (file no. 254736)].

Cambarus (Hiaticambarus) longirostris.—Hobbs, 1974b:16 [in part: Coosa drainage system in Georgia].

Untitled color photograph.—Bouchard in Anonymous, 1978:195.

SUMMARY OF LITERATURE PERTAINING TO GEORGIA.—The single female specimen from Georgia examined by James (1966) from Armuchee Creek, north of Armuchee, is in the Smithsonian collection. I have examined it and am assigning it to C. (H.) manningi. This and additional specimens from other localities listed below led Hobbs (1974b) to include northwestern Georgia within the range of C. (H.) longirostris. A beautiful color photograph, by R. W. Bouchard, of a specimen from the type-locality is included in Anonymous (1978).

DIAGNOSIS.—Rostrum strongly tapering and lacking marginal spines or tubercles. Postorbital ridge terminating cephalically in acute corneous tubercle. Suborbital angle obtuse to rounded. Cervical spine represented at most by low tubercle. Areola 3.7 to 4.3 times as long as broad and constituting 37.1 to 40.4 percent of entire length of carapace (45.0 to 48.9 percent of postorbital carapace length). Chela with row of tubercles on mesial margin of palm strongly depressed, sometimes reduced to few tubercles proximally, and lacking any part of second dorsolateral row; always with setal tuft at mesial base of fixed finger; lateral margin of propodus never costate. Hook on ischium of third pereiopod opposed or not by low tubercle on basis. Pleura of third through fifth abdominal segments with oblique cephaloventral margin, and subangular posteroventrally. First pleopod of first form male with short terminal elements: central projection bearing distinct subapical notch, not tapering, and directed at slightly more than right angle to shaft of appendage; and mesial process inflated, with acute tip directed caudally at about right angle and slightly laterally. Terga of abdomen uniformly dark and pleura with dark coloration extending from corresponding tergum posteroventrally leaving cream to white anteroventral section; no dark scalloped line evident along bases of pleura. Female with first pleopod present.

HOLOTYPIC MALE, FORM I.—Body subovate, depressed (Figure 67a,j). Abdomen narrower than cephalothorax (10.2 and 12.2 mm); maximum width of carapace distinctly greater than depth at caudodorsal margin of cervical groove (12.2 and 9.9 mm). Areola 3.8 times as long as broad, densely punctate, with 7 punctations across narrowest part, length 40 percent of total length of carapace (47.5 percent of postorbital carapace length). Rostrum with strongly convergent, thickened margins ending suddenly at base of acumen; latter gently upturned, reaching base of ultimate podomere of antennular peduncle; dorsal surface of rostrum deeply concave with prominent punctations, some coalescing in basal region, forming irregular transverse striae. Subrostral ridge rather strong and visible in dorsal aspect along entire length of rostrum, continuing onto acumen. Postorbital ridge short and deeply grooved dorsolaterally, terminating cephalically in acute corneous tubercle. Suborbital angle obtuse; branchiostegal spine very small, tuberculiform. Cervical spine represented by small, rounded tubercle scarcely larger than neighboring ones. Carapace punctate dorsally except for polished median gastric area, and granulate to tuberculate laterally; posterior orbital area with several rather large tubercles. Abdomen shorter than carapace (21.6 and 24.0 mm); pleura rather long, subangular caudoventrally and with sloping cephaloventral margins. Cephalic section of telson with 2 spines in each caudolateral corner, usual lateral incision deep and transverse suture clearly defined. Uropod with proximal podomere bearing acute mesial lobe, lateral lobe rounded; mesial ramus with well-defined submedian ridge bearing premarginal spine and spine present on distolateral extremity.

Cephalomedian lobe of epistome (Figure 67g) broadly subtriangular with weakly elevated (ventrally) margins, surface convex; main body with distinct fovea and arched epistomal zygoma, latter flanked anterolaterally by deep elongate pits. Ventral surface of proximal podomere of antennular peduncle with short, heavy, acute tubercles at base of distal third. Antennal peduncle with strong lateral spine on basis, remaining podomeres lacking spines; flagellum reaching second abdominal tergum; antennal scale (Figure 67i) about 2.8 times as long as wide, broadest at about midlength, distal spine very strong and reaching midlength of ultimate podomere of antennular peduncle. Ventral surface of ischium of third maxilliped with broad, longitudinal band of long, stiff setae mesially and with submarginal lateral row of smaller both stiff and plumose ones, few additional short plumose setae in area between; distolateral angle subacute but not produced.

Right chela (Figure 67l) 2.5 times as long as broad, mesial margin of palm occupying about one-third of its length. Mesial surface of palm without well-defined tubercles although with single row of 7 low elevations; dorsal and ventral surfaces with rather widely spaced large, deep punctations, lateral surface rounded with only slightest suggestion of costa. Fingers widely gaping and proximal half of opposable surface of fixed finger bearing conspicuous tufts of long plumose setae; neither finger with median longitudinal ridge on dorsal or ventral surface, both with conspicuous deep punctations; opposable margin of fixed finger with row of 13 small, rounded corneous tubercles (more proximal ones concealed among setal tufts) extending from base almost to distal seventh, single row of minute denticles present on level slightly ventral to tubercular row along distal fourth of finger, and corneous area immediately proximal to denticles with 1 prominent and 2 less well defined tuberculiform areas; opposable margin of dactyl also with row of 13 tubercles reaching level corresponding to that on fixed finger, minute denticles forming single row below tubercles along distal third, 2 additional tubercles present on lower level between fourth and sixth tubercles of long row. Lateral surface of fixed finger and mesial surface of dactyl punctate.

Carpus of cheliped with distinct oblique furrow dorsally flanked by setiferous punctations; mesial surface with single large spikelike tubercle; ventral surface punctate and bearing 2 tubercles on distal margin: 1 on lateral condyle and other situated mesioventrally. Merus with 1 (left with 2) premarginal tubercles dorsally; ventrolateral row of tubercles represented by 2 and ventromesial row consisting of 8, of which only distal member of each row spikelike; distolateral surface not produced, lacking spiniform tubercle. Ventromesial margin of ischium with only 2 tubercles.

Ischium of third pereiopod with simple hook (Figure 67h) extending proximally over basioischial articulation not opposed by tubercle on basis. Coxa of fourth pereiopod with caudomesial transverse ridgelike boss disposed vertically; that of fifth pereiopod devoid of boss but with ventral membrane sparsely setiferous.

First pleopods (Figure 67b,d,f) reaching coxae of third pereiopods, symmetrical, and with contiguous bases (see “Diagnosis” for description).

ALLOTYPIC FEMALE.—Excluding secondary sexual characters, differing from holotype in following respects: rostrum almost reaching distal end of ultimate podomere of antennular peduncle; suborbital angle rounded; branchiostegal spine virtually obsolete; cervical spine represented by single low tubercle; flagellum of antenna reaching tergum of third abdominal segment; abdomen much broader; proximal part of mesial margin of palm of chela with elevations more distinctly delimited, tuberculiform on right chela; opposable margin of fixed finger of chela with row of 12 tubercles and 1 well-defined tubercle on lower level immediately proximal to row of denticles; corresponding margin of dactyl also with row of 12 tubercles and single 1 on lower level between fourth and fifth tubercle of row; dorsal surface of merus of cheliped with single premarginal tubecle on right and left members, ventrolateral row represented by single, distal spikelike tubercle; ischium of left cheliped with ventromesial margin bearing only 1 tubercle. (See “Measurements.”)

Annulus ventralis (Figure 67k) 1.4 times as long as broad, slightly movable, distinctly asymmetrical posteriorly with caudodextral wall more convex and slightly produced caudally along median line; cephalic and central area conspicuously less sclerotized than caudal part; cephalic area with caudally diverging ridges flanking trough leading to depressed central area; sinus originating under caudal end of dextral ridge, coursing caudodextrally, making hairpin turn, and extending cephalosinistrally just across median line, where turning sharply caudally to caudal margin of annulus; tongue thus directed caudodextrally. Postannular sclerite about half as wide as annulus and about 3 times as long. First pleopods reaching midlength of annulus when abdomen flexed.

MORPHOTYPIC MALE, FORM II.—Differing from holotype in following respects: rostrum reaching midlength of ultimate podomere of antennular peduncle; cephalic section of telson with 3 spines in caudodextral corner; opposable margin of fixed finger with row of 11 tubercles, that of dactyl with 12 and row of denticles extending farther proximally on both fingers, as far as seventh tubercle from base on dactyl; merus of right cheliped with 1 spine representing ventrolateral row and 6 in ventromesial row, that of left with 1 and 9, respectively; hook on ischium of third pereiopod much reduced, not reaching basioischial articulation. (See “Measurements.”) First pleopod (Figure 67c,e) with neither terminal element corneous; central projection more inflated and disposed at right angle to shaft of appendage, its distal portion not being so strongly reflexed. Shaft with juvenile oblique suture.

COLOR NOTES (Figure 58e).—Dorsum of carapace largely dark brown to dark olive, fading ventrally; margins of rostrum and postorbital ridges bright orange to vermilion; dark brown reticulate pattern on mandibular adductor region. Hepatic area with broad, pale L-shaped cream splotch flanked by dark brown orbital and antennal areas anteriorly and reticulate mandibular adductor area and dark brown cervical groove posteriorly and ventrally; posteromedian part of gastric region very dark brown. Posterior thoracic region with almost black saddle, narrow dorsally and expanding ventrally, covering caudal flange. Terga of abdomen blue black except for narrow vermilion band along posterior margin of each, that of sixth segment sometimes paler bluish green, but if so, mottled in blue black; pleura white to cream anteriorly, bluish black posteriorly; pleuron of second segment with anterior vermilion spot. Anterior section of telson with pale transverse band anteriorly and broad band of sky blue across midlength, its posterior part and posterior section orange, suffused medianly with blue; entire telson edged with orange to vermilion. Uropods similarly margined; proximal two-thirds of mesial ramus sky blue fading distally to pale orange; proximal section of lateral ramus suffused with blue and distal section orange. Antennular and antennal peduncles dark olive to brown, flagella orange to orange brown. Third maxillipeds mostly pale blue to cream. Chelipeds pale turquoise from coxa to distal part of merus where becoming darker blue, and distal margin and articular knobs vermilion; carpus olive to brown dorsally, spines, distal margin, and articular knobs vermilion; propodus olive to dark brown with ridge opposite base, of dactyl and proximal articular knob vermilion; fingers dark olive to brown and with corneous tips. Remaining pereiopods vermilion at joints, otherwise blue from merus distally. Entire sternal area cream suffused with blue and some ridges and knobs orange to vermilion.

Measurements (mm)

TYPES.—The holotypic male, form I, allotypic female, and morphotypic male, form II (numbers 147911, 147912, and 147913, respectively), are deposited in the National Museum of Natural History, Smithsonian Institution, together with the paratypes comprising 7I, 28II, 36, 2j, 3j, and 1 with young.

TYPE-LOCALITY.—Little Cedar Creek (Coosa River basin) near school for deaf on outskirts of Cave Spring, Floyd County, Georgia. There the stream, some 7 meters wide and 0.3 meter deep, flows through a cleared, formerly cultivated area. Acer sp., Alnus rugosa, and Juniperus sp. are present along the banks. The water is clear and courses with a moderate current over a sandy clay bed littered with rocks in alternating pool and riffle areas. Cambarus (H.) manningi was found only in the riffles. Collected with it were C. (D.) striatus and C. (P.) coosae.

RANGE.—This crayfish is known only from the Coosa River basin in northwestern Georgia, southeastern Tennessee, and eastern Alabama, where it was found in the Ridge and Valley Province.

SPECIMENS EXAMINED.—I have examined 110 specimens from the following localities. GEORGIA. Chattooga County: (1) Armuchee Creek 7.1 airmi NNW of Armuchee near St Rte 200, 3II, 26 Jul 1974, O. S. Lancaster, J. E. McCaleb, A. E. Johnson, collectors. Floyd County: (2) type-locality, 5I, 29II, 29, 1 with young, 1 May 1967, Torgny Unestam, HHH; 2I, 6, 2j, 3j, 21 Oct 1976, T. A. English, Jr., HHH; (3) Cedar Creek at St Rte 100, 4.8 mi N of jct with St Rte 53, 1, 21 Oct 1976, TAE, HHH; (4) trib to Cedar Creek on US Hwy 41 near Cave Spring, 1I, 1, 13 Sep 1954, R. M. Bailey; (5) Armuchee Creek, 1, 6 Jul 1948, D. C. Scott. Whitfield County: (6) Conasauga River at St Rte 286, about 7 mi NE of Dalton at Murray Co line, 1I, 11 Oct 1969, E. T. Hall, Jr., HHH; (7) Mills Creek at unpaved road parallel to Tennessee line NE of Red Clay, 9I, 14, 1j, 23 Oct 1977, R. W. Bouchard, J. W. Bouchard. TENNESSEE. Polk County: (8) Conasauga River ofT US Hwy 411 at Easley Ford Bridge NW of Tennga, Georgia, 1, 17 Mar 1977, RWB, J. R. Weaver. (The type series is limited to specimens from localities 2–4).

Dr. Bouchard has informed me that he has examined specimens from three additional localities: ALABAMA. Cherokee County: (9) trib to Frog Creek off Co Rd 33 (Sec 15 SE, R 10E, T 12S), 1I, 10 Oct 1977, RWB, JRW. TENNESSEE. Bradley County: (10) Coahulla Creek at mouth of Tate Branch off St Rte 74, 1 specimen, 22 Oct 1969, D. A. Etnier, R. A. Stiles, and J. L. Wilson; (11) Mills Creek off Co Rd 4332 at unpaved road parallel to Georgia-Tennessee state line, 2II, 1, 1j, 16 Nov 1968, RWB, DAE.

VARIATIONS (Figure 68).—This crayfish exhibits few variations, perhaps the most obvious of which is in the suborbital angle; although consistently obtuse, it may be so broad as to appear almost obsolete. The areola varies from 3.1 to 4.6 times as long as wide and may have as few as six punctations across the narrowest part. Rarely is there more than one well-developed spine representing the ventrolateral row on the merus of the cheliped, but occasionally there are two, one of which, the more proximal, is much smaller than the other. The presence of a proximomesial tubercle on the carpus of the cheliped is unusual. Slight differences occur in the numbers of tubercles comprising the rows on the several podomeres of the cheliped but none exceeds the range that might be anticipated in better known species.

SIZE.—The largest specimen available is a female having a carapace length of 28.5 (postorbital carapace length 23.2) mm. The corresponding lengths of the largest and smallest males, form I, are 27.2 (23.1) and 17.2 (13.6) mm. Those lengths in the single female carrying young are 21.2 (17.5) mm.

Cambarus (Hiaticambarus) manningi Hobbs

Untitled color photograph.—Bouchard in Anonymous, 1978:175.

Cambarus (Hiaticambarus) manningi Hobbs, 1981:175, figs. 22c, 58e, 65, 67, 68, 211.

TYPES.—Holotype, allotype, and morphotype, USNM 147911, 147912, 147913 (male I, female, male II); paratypes, BMNH, USNM.

TYPE LOCALITY.—Little Cedar Creek (Coosa River basin) near school for deaf on outskirts of Cave Spring, Floyd County, Georgia.

RANGE.—Coosa River basin in northwestern Georgia, southeastern Tennessee, and northeastern Alabama.

HABITAT.—Rocky areas of streams.