New Crayfish Species 
81 
Only two large form II males have been collected; one (the morphotype) 
is 23.9 mm TCL (17.1 mm PCL), and the other is 24.3 mm TCL 
(16.7 mm PCL). The largest female measures 32.8 mm TCL (24.1 
mm PCL). Five other females have TCLs greater than 28 mm. The 
smallest female with attached ova or young measures 17.1 mm TCL 
(11.3 mm PCL), and the largest female in this condition measures 
25.3 mm TCL (18.1 mm PCL). Assuming 17.1 mm as the lower limit 
of TCL for sexually mature females (range = 17.1-32.8 mm; n = 
46), the mean TCL for this group is 23.4 mm. The TCLs of 101 
form I males and mature females range from 15.8 to 34.1 mm (both 
extremes are males) and the mean is 24.1 mm. 
Life history notes — Form I males have been collected in every 
month except June, July, and December, but were preponderant in 
the spring and fall. Of 71 such males, 22 were collected in March, 
10 in April, and 22 in October. A form II male collected on 6 May 
1981 molted to form I on 3 July 1981 in the laboratory. 
Females bearing ova or young have been collected only in April 
and May. An unmeasured female taken on 8 April 1979 had two third- 
instar young attached, and a female measuring 18.7 mm TCL (13.4 
mm PCL), collected on 16 April 1977, was carrying 39 ova of about 
1.8 mm diameter. The latest date on which a female carrying young 
has been found was 18 May 1986. Table 2 provides data for six laden 
females collected at the same site on 6 May 1981. 
Crayfish associates — Cooper and Ashton (1985) and Cooper and 
Braswell (1995) briefly discussed the decapod fauna of the Neuse 
and Tar-Pamlico basins. The crayfish associates encountered with greatest 
frequency in O. carolinensis samples were Cambarus (Depressicambarus) 
latimanus (LeConte) and Cambarus ( Puncticambarus ) acuminatus Faxon 
(s.l.). Procambarus ( Ortmannicus ) acutus (Girard) was the third most 
often collected species in these samples, and all three of these associates 
appeared together in some of them. Cambarus ( Lacunicambarus ) diogenes 
Girard also was included in several of the collections. Generally, C. 
acuminatus (s.l.) and C. latimanus far outnumbered O. carolinensis 
in samples where they were taken together. At a few localities, however, 
O. carolinensis either outnumbered any other species found, or was 
the only species collected. Although Fallicambarus ( Creaserinus ) fodiens 
(Cottle), Cambarus ( Depressicambarus ) reduncus Hobbs, and P. medialis 
have been found in open water in both river basins, they have not 
been taken at any O. carolinensis site. 
Relationships — The general features of the form I male gonopod 
(terminal elements long and of subequal length, subparallel, subsetiform) 
and the female annulus (well defined sulcus, deep fossa, large and 
