Cambarus halli Hobbs 1968

Cambarus (Depressicambarus) halli Hobbs

Cambarus halli Hobbs, 1968a:269, figs. 12–22.

Cambarus (Depressicambarus) halli.—Hobbs, 1969b:104, figs. 8, 18e; 1974b:13, fig. 29; 1981:96, figs. 23i, 37b, 39c, 42, 43, 200.—Bouchard, 1978a:33, figs. 1a, e, 3f.

TYPES.—Holotype, allotype, and morphotype, USNM 129288, 129289, 129290 (male I, female, male II); paratypes, USNM.

TYPE LOCALITY.—Tributary of the Tallapoosa River, 1.3 miles (2.1 km) south of the river on U.S. Highway 27, Haralson County, Georgia.

RANGE.—Tallapoosa drainage system in Alabama and Georgia.

HABITAT.—Streams.

Cambarus (Depressicambarus) halli Hobbs

Cambarus extraneus.—Anonymous, 1967i, tab. 3*.

Cambarus halli Hobbs, 1968a:269*–273*, figs. 12–22; 1968b: K–16*.—Anonymous, 1968:11*[photograph]; 1970b: (219, 220, 222–225)*.—Hart and Hart, 1971: [not 107]; 1974:90*, 134*, [not 31].—Bouchard, 1978:29, 43, 45–46.—Wharton, 1978: 46*, 220*.

Cambarus (Depressicambarus) halli.—Hobbs, 1969a: (102, 104, 136, 138, 154)*, figs. 8, 18e; 1972b:113*, 146*, figs. 92d, 97b, 99b; 1974b:13*, fig. 29.—Hobbs and Hall, 1969:293; 1972:151*, 159*, 160*.—Bouchard, 1972:33; 1978:30, 33–34*, figs. la,e,f, 3f*.

The above references constitute a complete bibliography for the species; those pages on which Georgia representatives are included are marked with an asterisk.

SUMMARY OF LITERATURE.—The first published record of this crayfish (Anonymous, 1967i) was based on the erroneous identification of specimens from three localities in the Tallapoosa Basin, two in Haralson County, Georgia, and one in Cleburne County, Alabama. The only recorded data not accompanying the original description of the species are the photograph (Anonymous, 1968) and new locality records (Anonymous, 1970b, and Hart and Hart, 1974). Hart and Hart (1971) mistakenly cited this crayfish along with Procambarus (Pe.) spiculifer as hosts of Ankylocythere tallapoosa, a new entocytherid ostracod described by them. In their monograph (1974:31), they listed the hosts in the same locality as C. (D.) latimanus and C. (D.) halli. Actually the hosts were C. (D.) latimanus and P. (Pe.) spiculifer. In their Paulding County station (pages 90 and 134), they reported C. (D.) halli as host to Entocythere internotalus Crawford (1959) and Uncinocythere simondsi. The remaining citations include remarks on its relationships to Cambarus (J.) unestami Hobbs and Hall (1969), to C. (D.) englishi, and to other members of the subgenus (Hobbs, 1969a). The latter reference also includes keys and a summary of the distribution of this crayfish as does Hobbs (1972b). The distribution is also summarized in Hobbs (1974b). The most recent account of the species is that of Bouchard (1978), who included a diagnosis, statement of the range, and commented on its relationships. All confirmed previous records for the State are included under “Georgia Specimens Examined.”

DIAGNOSIS.—Eyes moderately large. Rostrum with marginal spines or tubercles, rarely abraded in larger animals. Carapace with well-developed cervical spine. Areola 3.0 to 5.0 times as long as wide and constituting 30.0 to 33.7 percent of entire length of carapace (38.0 to 41.9 percent of postorbital carapace length) with 3 to 9 punctations across narrowest part. Suborbital angle broadly rounded to obsolete. Postorbital ridge with cephalic spine or tubercle. Antennal scale about 2.5 times as long as broad, widest at about midlength. Palm of chela with 5 to 7 tubercles in mesialmost row. First pleopod of first form male with central projection moderately long and wide, strongly arched, bearing distinct subapical notch, and directed at angle of approximately 125 degrees to main shaft of appendage, its tip reaching proximally to level of mesial process; latter with very narrow gap between bulbiform portion and shaft of appendage, distal extremity usually with single rounded to subacute apex; caudal knob absent. Carapace brown to olive; abdominal terga with transverse light bands. Female with first pleopod present.

COLOR NOTES. (Figure 37b).—

Cephalic portion of carapace dark brown with cream tubercles laterally. Margins of rostrum and postorbital ridges red. Branchiostegites tan, areola dark olive brown. Abdomen dark olive with narrow transverse pinkish yellow band on caudal margin of each tergum; pleura with cream margins. Chela olive with basal articular tubercle and those at base of dactyl red; tubercles on mesial surface of palm orange; fingers dark green basally fading rapidly to cream; tubercles on mesial surface of dactyl orange. Entire ventral surface of animal greenish cream (Hobbs, 1968a:273).

The color of this crayfish is so markedly similar to that of C. (D.) englishi that if consistent differences exist, they have not been recognized.

TYPES.—Holotype, allotype, and morphotype, USNM 129288, 129289, and 129290 (I, , II); paratypes, USNM.

TYPE-LOCALITY.—Small tributary of the Tallapoosa River, 1.3 miles south of the river on U.S. Highway 27, Haralson County, Georgia.

RANGE.—Endemic in the Tallapoosa Basin, where known from Paulding County, Georgia, to Lee and Tallapoosa counties, Alabama.

GEORGIA SPECIMENS EXAMINED.—I have examined 136 specimens all from the Tallapoosa Basin. Carroll County: (1) Little Tallapoosa River 3.1 mi NW of Carrollton (Anonymous, 1970b:222), 1j, 2j, 4 Sep 1969, M. W. Walker, R. F. Holbrook, collectors; (2) Little Tallapoosa River at St Rte 100, 2.5 mi S of Bowden (Anonymous, 1970b:225), 1II, 2j, 1j, 3 Sep 1969, RFH, E. T. Hall, Jr.; (3) Little Tallapoosa River 3.7 mi SE of Bowden (Anonymous, 1970b:224) off Rte S838, 1j, 4 Sep 1969, MWW, RFH; (4) Buffalo Creek at Rte S838, 6 mi SE of Bowden and 5.6 mi SW of Carrollton (Anonymous, 1970b:223), 2, 2j, 4j, 4 Sep 1969, MWW, RFH. Haralson County: (5) type-locality (Anonymous, 1970b:219), 1I, 3II, 4j, 2j, 18 Apr 1966, ETH, HHH; 1, 2j, 1969, ETH, R. M. Gaddis; 1I, 1j, 2j, 2 ovig , 26 Apr 1968, John Ross, HHH; (6) Tallapoosa River at St Rte 100, first riffle upstream from bridge, 1, 9j, 14j, 3 Sep 1969, ETH, RFH; 4I, 4, 5j, 13 Oct 1969, ETH, HHH; 2I, 1II, 2, 1j, 30 Apr 1971, T. A. English, Jr., HHH; 1j, 2j, 25 Jul 1971, TAE, ETH; 1I, 1j, 2j, 23 Sep 1971, ETH, TAE; (7) Tallapoosa River at US Hwy 27, 3I, 4II, 3, 1j, 5j, 18 Apr 1966, ETH, HHH; (8) trib of Tallapoosa River, 0.7 mi S of river on US Hwy 27, 1I, 2j, 7j, 26 Apr 1968, JR, HHH; (9) Tallapoosa River at RR bridge, 2.5 mi W of Tallapoosa (Anonymous, 1970b:219), 4j, 3j, 13 Sep 1969, ETH, MWW; (10) Walker Creek, 3.8 mi SW of Buchanan on St Rte 120, 1j, 23 Apr 1968, C. R. Gilbert; (11) Beach Creek 4.5 mi E of junction of St Rte 100 on Rte 120, 3j, 30 Apr 1971, TAE, HHH; (12) Tallapoosa River 1.1 mi N of Draketown on unnumbered road, 1, 23 Apr 1968, CRG; (13) Beach Creek at unnumbered road, last bridge before creek joins Tallapoosa River (Anonymous, 1967i, tab. 3), 1j, 12 Dec 1966, Donald Schultz; (14) Tallapoosa River at US Hwy 78 (Anonymous, 1967i, tab. 3), 1j, 2j, 12 Dec 1966, DS. Paulding County: (15) Tallapoosa River at St Rte 101 (Hart and Hart, 1974:90), 2, 5j, 2j, 18 Apr 1966, ETH, HHH.

VARIATIONS.—The only regionally restricted variation observed is the narrower areola in specimens from the Little Tallapoosa watershed. Whereas in the Tallapoosa Basin in Haralson and Paulding counties, it ranges from 2.9 to 4.0 times as long as broad, in the Little Tallapoosa in Carroll County, it ranges from 4.0 to 5.0. Partially reflecting the narrower areola of the latter, the punctations within it are fewer, with only three extending across the narrowest part; in contrast, in the Tallapoosa specimens the punctations are crowded, four to nine present in the most constricted part. Although the following variations have been observed in specimens from Georgia, none is characteristic of populations occupying a limited part of the range in the state. The rostrum varies considerably in length, and, to some degree, in the relative thickness of the margins; usually, however, the latter are narrow and only slightly swollen. In an occasional individual that is in a late intermolt stage, the marginal spines or tubercles are abraded, and the margins are almost smooth from base to apex of acumen. The chelipeds exhibit few variations worthy of note: except in regenerated appendages, the mesialmost row of tubercles on the palm ranges from five to seven (usually six), and the ventral rows on the merus consist of six to nine in the mesial one and two to four in the lateral.

SIZE.—The largest Georgia specimen available is an ovigerous female having a carapace length of 37.0 (postorbital carapace length 29.5) mm. The corresponding lengths of the largest and smallest first form males are 35.0 (28.4) and 30.0 (23.3) mm; those of the smallest ovigerous female are 33.5 (26.7) mm.

Cambarus (D.) halli

E Ankylocythere tallapoosa Hart and Hart (1971:107): Carroll, Haralson, Paulding (Hart and Hart, 1971: 107–108)

Entocythere internotalus (Crawford, 1959:152): Paulding (Hart and Hart, 1971:107)

Uncinocythere simondsi: Haralson, Paulding (Hart and Hart, 1971:107, 108)