Copepods in Southeastern Pacific — Grice and Hulsemann 
329 
ment small without spines, separated from 
fourth segment by fine line. Genital segment 
asymmetrical, right side with large swelling. 
Rostrum strong, 1 -pointed, curved downward 
and backward. First antenna consisting of 24 
free segments, segments 8 and 9 fused; reach- 
ing to distal end of genital segment. Endopod 
of second antenna slightly longer than half the 
length of exopod, outer lobe of terminal seg- 
ment of endopod with 7 setae, inner lobe with 
9 setae. Endopod of first swimming foot 1- 
segmented, exopod 2-segmented with 3 external 
spines. Endopod of second swimming foot 2- 
segmented, exopods of second to fourth feet 
and endopods of third and fourth feet 3 -seg- 
mented. Posterior surface of first basipodal 
segment of fourth swimming foot with 6-8 
rather strong spines. Total length 5.42 to 6.50 
mm. Holotype: usnm 120529- 
remarks: Pseudochirella tuberosa resembles 
P. gibbera Vervoort and P. mawsoni Vervoort, 
but is distinguished from these by its 2 -seg- 
mented exopod in the first swimming foot and 
the characteristic shape of the genital segment. 
Undeuchaeta major Giesbrecht, 1888 
remarks: The first basipodal segments of the 
fourth pair of swimming feet of 28 females 
were examined. Most of them have 2 or 3 small 
spines on these segments. In only two specimens 
are the spines absent. The size of the females 
varies from 4.66 to 5.25 mm. 
The genus Undeuchaeta is defined as having 
no spines on the first basipodal segment of the 
fourth swimming foot. In other respects (e.g., 
the structure of the genital segment), however, 
these females agree with the description of 
U. major. The present specimens are also simi- 
lar to but smaller than Pseudochirella incisa 
(Esterly). The synonymy of this species has 
been discussed by Grice (1964). Pending re- 
examination of Giesbrecht’ s type specimen we 
will propose neither an emendation of the 
generic description nor a transfer of U. major 
to another genus. 
Euchaeta barbata Brady, 1883 
remarks: The total length of one female 
Euchaeta barbata from station 5 is 10.16 mm 
which is the size of the closely related E. farrani 
With. Our female, however, is identified with 
E. barbata because the second external spine on 
the third exopodal segment of the second swim- 
ming foot overreaches the end of the segment, 
as is pointed out by With (1915). 
Euchaeta dubia Esterly, 1906 
remarks: One male Euchaeta dubia was 
found at station 10. It measures 8.00 mm in 
length. Tanaka (1958) reported the length of 
the male of this species (as Par euchaeta comosa) 
as 7.25 mm, Vervoort (1963) as 6.80 and 7.10 
mm, and Grice and Hulsemann (1967) as 6.35 
mm. The tooth mentioned by Vervoort as being 
present in the incision of the bifid lamella on 
the exopod of the left fifth foot is absent in our 
specimen. It is also absent in Esterly’s (1906) 
and Tanaka’s (1958) figures of this species as 
well as in a male found by Grice and Hulsemann 
(1967) in the Indian Ocean. 
Euchaeta pavlovskii (Brodsky, 1955) 
remarks: Euchaeta pavlovskii was described 
from specimens obtained in the Bering Sea and 
Kuril-Kamchatka Trench. Our findings of this 
species extend its geographical range to the 
eastern South Pacific and its size range to 9.33- 
10.83 mm in length. Brodsky’s (1955) speci- 
mens measured 10.4-10.8 mm. It may be added 
here that the first antenna of E. pavlovskii con- 
sists of 24 free segments (segments 8 and 9 are 
fused) and reaches the posterior margin of the 
second thoracic segment. 
Euchaeta pseudotonsa Fontaine, 1967 
remarks: One female Euchaeta pseudotonsa 
was found at station 23 and two females were 
found at station 43. Fontaine (1967) considers 
the range of this species to be restricted to the 
Atlantic Ocean. Re-examination of the speci- 
mens reported by us in an earlier paper (Grice 
and Hulsemann, 1967, sample no. 22) as E. 
tonsa revealed that one female is E. pseudo- 
tonsa. Thus, our records indicate that this species 
occurs in all three oceans. 
Euchaeta re gaits n. sp. 
Figs. 34-48 
occurrence: Station 2, 2 females; station 
3, 1 female; station 16, 1 female; station 20, 1 
female; station 40, 9 females, 1 male; station 
41, 3 females; station 54, 3 females. 
