no. 3602 CRAYFISHES — HOBBS, HOLT, AND WALTON 51 



teeth shorter than others; lateral teeth of lower jaw longer than 

 median teeth" (Holt, 1965, p. 12). 



Range. — From Overton County, Tenn., sporadically to the New 

 River drainage in Giles County, Va. 



Specimens examined. — 7 specimens from station 81 in the New 

 River drainage at an elevation of 488 m. 



Host and associates. — Ankyrodrilus legaeus was associated with 

 Cambarus sciotensis at station 81. 



Ostracod associates include Dn. ileata and Dt. daphnioides. 



BranchiobdeUid associates include C. branchiophila, C. fallax, C. 

 heterognatha, C. ingens, and P. alcicornus. 



Remarks. — Ankyrodrilus legaeus has been found associated with 

 eight other species or subspecies of crayfishes; its single occurrence on 

 C. sciotensis in the Mountain Lake region is no indication of host 

 specificity. 



Genus Bdellodrilns Moore, 1895 



Diagnosis. — Head elongated and less in diameter than anterior 

 body segments; peristomium without lobes, body wall thin and glandu- 

 lar (parasitic facies); posterior sucker small and weak; two pairs of 

 testes, no prostate, penis eversible; spermatheca bifid; lateral glands 

 present in trunk segments I through IX ; anterior nephridia open by ; 

 common pore; upper jaw longitudinal ridge bearing three teeth, lower 

 jaw deep trough in which dorsal one fits; inhabitants of gill chambers. 

 Monotypic. 



Bdellodrilus illuminatus (Moore) 



i 



Figures ISa-b 



Branchiobdella illuminata Moore, 1894, p. 421. 

 Bdellodrilus ilhiminatus Moore, 1895b, p. 498. 



Diagnosis. — As above for the genus. 



Range. — Eastern North America. 



Specimens examined. — Approximately 50 specimens in 24 collec- 

 tions from the following stations: 5, 16, 17, 19, 20, 22, 34, 40, 41, 44, 

 45, 48, 51, 59, 68, 76, 86, 87, 97, 115, 120-122, 125, and 127. All of the 

 major drainage areas are represented among these stations. Eleva- 

 tions range from 518 to 1250 meters. 



Hosts and associates. — Bdellodrilus illuminatus was associated 

 with Cambarus acuminatum at stations 20, 87; with C. b. bartonii at all 

 stations except 20, 40, 41, 86, 127; with G carolinus at 22, 40, 41, 127; 

 with C. I. longulus at 20, 22, 34; and with G sciotensis at 5, 19, 44, 59, 

 86, and 97. 



Ostracod associates include As. asceta and Dt. chalaza at stations 

 22, 40, 41, 127; Dn. ardis at 20; Dn. ileata at 5, 16, 19, 20, 22, 34, 44, 



