dcsimg

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Procambarus (Hagenides) caritus Hobbs

Procambarus advena.—Hobbs, 1942b:77 [in part].

Procambarus (Hagenides) caritus Hobbs, 1981:319, figs. 118b, 122, 123.

TYPES.—Holotype, allotype, and morphotype, USNM 117598, 133678, and 116952; paratypes, USNM.

TYPE LOCALITY.—Seepage area, 3.7 miles (5.9 km) west of Glenwood, Wheeler County, Georgia, on U.S. Highway 280.

RANGE.—Altamaha and Satilla watersheds in the coastal plain of Georgia.

HABITAT.—Burrows (primary burrower).
license
cc-by-nc-sa-3.0
bibliographic citation
Hobbs, Horton Holcombe, Jr. 1989. "An Illustrated Checklist of the American Crayfishes (Decapoda, Astacidae, Cambaridae, Parastacidae)." Smithsonian Contributions to Zoology. 1-236. https://doi.org/10.5479/si.00810282.480

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Procambarus (Hagenides) caritus

Procambarus advena.—Hobbs, 1942b:77 [in part].—Hart and Hart, 1974:28 [in part].

SUMMARY OF LITERATURE.—Records of the occurrence of Procambarus advena in Appling County, Georgia, by Hobbs (1942b) and in Laurens County by Hart and Hart (1974) are based on my erroneous determinations of specimens of the species described here.

DIAGNOSIS.—Rostrum without marginal spines or tubercles. Carapace lacking cervical spine. Areola 13.7 to 30.5 (average 15.0) times as long as broad and constituting 34.8 to 38.4 (average 36.1) percent of entire length of carapace (38.9 to 44.7, average 41.3, percent of postorbital carapace length). Ventral surface of basis and ischium of third maxillipeds not densely bearded. Male with mesial surface of palm of chela lacking beard but bearing cristiform row of 6 to 9 tubercles; hooks on ischia of third pereiopods only; coxa of fourth pereiopod with caudomesial boss. First pleopods of first form male asymmetrical, contiguous, and reaching coxae of second or third pereiopods, cephalic surface without shoulder, and preapical setae limited to few on cephalodistal border; mesial process acute to rounded distally and directed caudodistally; cephalic process absent, its usual position marked by angle on corneous ridge along cephalolateral base of subtriangular central projection, latter strongly corneous, arising from cephalodistal surface of appendage and directed distally (weakly arched cephalically), exceeding tumescent caudal knob by less than half length of process. Female with chela as in male; annulus ventralis subelliptical in outline, longer than broad, and with multituberculate cephalolateral elevations; first pleopod present.

HOLOTYPIC MALE, FORM I.—Body (Figure 122 c, h) subovate, slightly compressed laterally. Abdomen narrower than thorax (9.8 and 12.7 mm). Width of carapace slightly greater than depth at caudodorsal margin of cervical groove (12.7 and 12.0 mm). Areola about 14 times as long as broad, with 1 punctation in narrowest part. Cephalic section of carapace 1.8 times as long as areola; length of latter 35.6 percent of total length of carapace (40.6 percent of postorbital carapace length). Rostrum excavate dorsally, with nonthickened convergent margins lacking marginal spines or tubercles; upper surface with widely scattered tubercles between usual submarginal rows; acumen continuous with basal portion of rostrum and reaching anteriorly to base of ultimate podomere of antennule; subrostral ridges moderately well developed and evident in dorsal aspect for at least two-thirds length of rostrum. Postorbital ridge moderately strong, grooved dorsolaterally, and merging cephalically with carapace, lacking tubercle or spine. Suborbital angle obsolete. Branchiostegal spine very small. Carapace punctate dorsally and granulotuberculate laterally, cervical spine represented by very weak tubercle. Abdomen and carapace subequal in length (23.5 and 23.6 mm), pleura subtruncate ventrally. Cephalic section of telson with 1 spine in right and 2 in left caudal corners, caudal part rounded and rather narrow. Uropods with 2 short, acute prominences on basal podomere; mesial ramus with short distolateral spiniform tubercle but lacking spine or tubercle on median ridge; lateral ramus with usual row of small spines immediately proximal to transverse suture, lateralmost larger than others. Cephalic lobe of epistome (Figure 122g) resembling bell in outline, with cephalomedian projection, ventral surface slightly convex and margins somewhat thickened and elevated ventrally; fossa quite shallow and epistomal zygoma strongly arched. Antennule of usual form, with strong ventral spine near midlength of proximal podomere. Antennae broken but probably reaching almost to caudal margin of carapace; peduncle without spines. Antennal scale (Figure 122i) about 2.4 times as long as wide, greatest width distal to midlength, lamellar portion not greatly broader than thickened lateral part; latter terminating in strong spine. Third maxilliped with basis bearing conspicuous mesial tuft of long, stiff, simple setae; ischium, lacking distolateral spine, with submarginal lateral row of short setae, longer ones largely restricted to longitudinal series lateral to crista dentata, leaving most of broad ventrolateral area almost naked.

Right chela (Figure 122k) subtriangular, subovate in cross section, rather strongly depressed. Mesial surface of palm with cristiform row of 9 tubercles subtended dorsolaterally by row of 6 subsquamous ones, other squamous tubercles scattered over dorsal surface and lateral margin of palm and extending onto basal portions of fingers; ventral surface of palm mostly punctate with ventrolateral row of punctations, bearing tufts of conspicuously long setae, extending from base of palm almost to tip of fixed finger; ventromedian part of palm with scattered tubercles and very strong one opposite base of dactyl. Fixed finger with very sharply defined median longitudinal ridge dorsally and less well developed one ventrally, ridge flanked proximally by squamous tubercles and distally by conspicuous setiferous punctations; lateral margin of finger with row of squamous tubercles proximally, decreasing in size distally and near midlength replaced by setiferous punctations; opposable margin of fixed finger with 4 large tubercles in proximal half, third from base largest, and large tubercle on lower level at base of distal third of finger, row of minute denticles extending from proximal group of tubercles to corneous tip of finger. Dactyl with dorsal surface similar to that of fixed finger, mesial margin with few tubercles proximally, and ventral surface without tubercles but with setiferous punctations; opposable margin with row of 5 tubercles along proximal two-thirds of finger, first and third from base much larger than remaining ones, and single row of minute denticles extending from base of second major tubercle to corneous tip of finger.

Carpus of right cheliped punctate dorsally, laterally, and ventrally, and tuberculate mesially; dorsal surface with shallow oblique furrow; dorsomesial margin with row of small tubercles; mesial surface with row of 3 increasing in size distally; among small tubercles on ventral surface 2 large ones situated subterminally.

Merus with dorsal surface tuberculate, tubercles low and none spiniform; mesial and lateral surfaces mostly polished with few shallow setiferous punctations; ventral surface with lateral row of 9 tubercles (11 on left), 6 of which flanked by long stiff setae, and mesial row of 11 tubercles, rows not converging distally; distolateral extremity lacking spine. Ischium with row of 4 tubercles.

Hook (Figure 122j) on ischium of third pereiopod only; hook simple, heavy, curved, and extending proximally over distal portion of corresponding basis. Coxa of fourth pereiopod with prominent knoblike boss disposed obliquely vertically; that of fifth smaller and subacute.

Sternum between third, fourth, and fifth pereiopods rather shallow but bearing dense fringe of plumose setae on ventrolateral margins.

First pleopod (Figure 122a,f,l) as described in “Diagnosis.”

ALLOTYPIC FEMALE.—Description of holotype applicable to allotype except for secondary sexual characters and following: cephalic section of telson with 1 spine in each caudolateral corner; left chela with only 3 tubercles on opposable margin of dactyl; ventral surface of merus of cheliped with ventrolateral row of 11 tubercles and ventromesial one of 12. (See “Measurements.”)

Annulus ventralis (Figure 122d) only moderately deeply embedded in U-shaped sternum, subelliptical, longer than broad and with very high, multituberculate, cephalolateral ridges flanking deep median trough, from caudal part of which sinus originating, forming right hairpin turn to median line, there turning caudally and, in slightly sinuous curve, extending to caudal margin of annulus. Postannular sclerite as figured. First pleopod reaching midlength of annulus when abdomen flexed.

MORPHOTYPIC MALE, FORM II.—Except for following differences in cheliped and secondary sexual characters, description of holotype applicable to morphotype: mesial surface of palm of chela with row of 8 tubercles; opposable margin of dactyl with only 3; ventral surface of merus with 11 tubercles in both mesial and lateral rows. Hook on ischium of third pereiopod reduced to tubercle, and bosses on coxae of fourth and fifth pereiopods much less well developed.

First pleopod (Figure 122b,e) with shorter, more inflated mesial process and central projection, and latter lacking angular bend cephalically; juvenile oblique suture in proximal fourth of appendage.

COLOR NOTES (Figure 118b).—No features noted in the coloration of this crayfish serve to distinguish it from P. (H.) advena and P. (H.) talpoides.

TYPES.—The holotypic male, form I, allotypic female, and morphotypic male, form II, are deposited in the National Museum of Natural History, Smithsonian Institution, numbers 117598, 133678, and 116952, respectively, as are the paratypes consisting of 5I, 3&II, 4, and 1 ovigerous

Measurements (mm)

Holotype Allotype Morphotype

Carapace

Height 12.0 13.1 11.0

Width 12.7 13.7 10.5

Entire length 27.0 27.5 22.8

Postorbital length 23.6 24.2 20.0
license
cc-by-nc-sa-3.0
bibliographic citation
Hobbs, Horton Holcombe, Jr. 1981. "The Crayfishes of Georgia." Smithsonian Contributions to Zoology. 1-549. https://doi.org/10.5479/si.00810282.318