Redescription of Teredicola typica C. B. Wilson 
(Crustacea: Copepoda) 
Mildred Stratton Wilson 1 
Since 1942 Teredicola typica has been known 
to be associated with shipworms in the Ha- 
waiian Islands, but neither the genus nor 
species has been reported in literature from 
any other locality, or from any other host 
group. Dr. C. H. Edmondson of the Bernice 
P. Bishop Museum, who made the original 
collections of this interesting copepod, has 
stated in personal correspondence that he has 
inquired about the occurrence of copepods 
in shipworms around the world, but has not 
yet found anyone who has encountered this 
parasite. Recently, another copepod parasite 
has been discovered in Teredo petiti from "la- 
goons of western Africa" by Rancurel (1954). 
This copepod, for which a new genus Tere- 
dophilus has been proposed, does not seem on 
the basis of the description to bear any close 
relationship to Teredicola (see Discussion). 
The original description of Teredicola typica 
was made by Dr. Charles B. Wilson in a 
posthumous paper (1942) and was repeated 
without emendation in 1944. Records of oc- 
currence of the copepod in the Hawaiian 
Islands, and observations on its habits and 
early development are given in papers by 
Edmondson (1942, 1945). Some corrections 
and additions to the original description have 
been made by M. S. Wilson and Illg (1955) 
in a paper outlining the history and interpreta- 
tions of the family Clausiidae to which Tere- 
dicola is referred. The purpose of the present 
paper is to place on record a revised and 
amplified description with illustrations of all 
1 Arctic Health Research Center, United States Pub- 
lic Health Service, Anchorage, Alaska. Manuscript 
received August 7, 1956. 
the appendages, some of which were omitted 
or confused in the original description. 
The specimens examined were from collec- 
tions of Teredo milleri made in Honolulu har- 
bor, January 10, 1945, by Dr. C. H. Edmond- 
son. I wish to acknowledge Dr. Edmondson’s 
cooperation in this study. 
Teredicola typica C. B. Wilson, new description 
Figs. 1-19 
Teredicola typica C. B. Wilson, 1942: 60, fig. 
1 a-h; 1944:539, pi. 31, figs. 172-179. 
Teredicola typica , Edmondson, 1942:145, fig. 
13; 1945:220, figs. 1-3. 
Teredicola typica , M. S. Wilson and Illg, 1955: 
132 . 
Length (of specimens examined), female, 
4.0-4.71 mm.; male, 1.76-2.21 mm. 
female (Fig. 1). Metasome of four ex- 
panded segments; urosome of five posterior 
segments reduced in width to about one- 
third of that of last metasome segment. Meta- 
some segments usually swollen and fleshy, 
dorsally rounded, constricted laterally be- 
tween segments; integument thin to rela- 
tively heavy. Somite of leg 1 united with 
cephalic segment to form metasome segment 
1 (Fig. 2) ; shape of segment variable, ranging 
from that with sloped outer margin (Fig. 1) 
to that with distinct, rounded, distal expan- 
sions (Fig. 2). 
Urosome segment 1 of female (somite of 
leg 5) the shortest, marginally free or entirely 
recessed into last expanded segment of meta- 
some and not visible dorsally; no remnants 
265 
