Genital segment (figure \b) wider than long (348 x 483 yxm) with 3 dorsal setae at the egg sac attachment. Female leg 2 endopod second segment with 2 inner setae, leg 3 endopod second segment with 1 inner seta. Second antenna (Figure 9e) 3-segmented; second segment with one fluffy seta and one short, naked seta; third segment armed with several rows of short spines, and with 4 hook-like terminal spines and 3 setae.
First antenna (Fig. 5ld) first segment with 27 setae (all but 2 corky), last segment with 13 glabrous setae. Maxilliped (Figure 56/) basal segment with pair of sclerotized processes on inner margin opposite claw tip.
As in other widespread species of Caligus, size differences appear to be correlated with water temperature rather than host species. Caligus pelamydis females can be distinguished from other species of Caligus found on scombrids by the following combination of characters: cephalon 40-45 percent of total length; abdomen 23-25 percent of total length; second and third segments of leg 2 endopod (see figure 65«) each with a large patch of fine spinules along outer margin; legs 4, 3-segmented with the last segment produced distally to give the segment a triangular shape (see Figure 666) and prominent fringes at the base of all setae, teeth of nipple furca-spatula and as wide or as wide as the base ( figure 65c). In our sample, we found the following differences based on adults of both sexes: second antenna of the male with rugose spot along the posterior edge of the basal segment; postoral process of male (Figure 66
Figure 68e) basipod with large patch of spinules; exopod first segment with short spine on
Appendage as in female except second antenna (Figure 69g) with 2 rough areas on basal segment, a short, recurved terminal claw, a seta near base of terminal claw. REMARKS.—This species is easily separated from other species of Caligus reported from scombrids by the peculiar shape of the first segment of the exopod of leg 4. MATERIAL EXAMINED.—$4 U from the gills of a specimen of Scomberomorus tritor collected by mouth of the Belas River, Ghana.
Genital segment (Figure 706) somewhat wider than long (1.09 X 1-31 mm), globose, comprising about one-third of total body length. A spot of fine spinules at the outer distal corners of the last abdominal segment. First antenna (Figure 70a") first segment with 27 setae, most with fine plumosities, last segment with 14 bare setae, segments measure 118 /*m and 100 /*m along posterior margins respectively. Figure 70/) and stout recurved claw.
First leg (Figure 71
1 1 35 corner and an inner seta, last segment with 3 outer
It is not surprising that a copepod common on a prey fish species (Cololabis) is occasionally found on its predator species. This is undoubtedly due to its rarity on scombrids and its occurrence on the host body surface (not usually found on preserved hosts). Pillai described this species based on a single female collected from the body surface of Euthynnus affinis from Vizhingom, India.
This species was described from a single female collected from the body surface of a Gymnosarda unicolor from Eniwetok Atoll. Lewis compared this species with a previously described species, Caligus kalumai Lewis, 1964, collected from Acanthurus guttatus from Hawaii. We feel that this species represents an accidental attack and Gymnosarda unicolor is not its usual host.
Lewis has given a good description with illustrations, and as this is undoubtedly not a scombrid parasite we will not repeat a description here. MATERIAL EXAMINED.—78 collections containing from the gill region of the following hosts and localities: Thunnus alalunga from He Amsterdam, Chile, New Jersey, Brazil (north coast), North Atlantic (25°N, 35°W), Azores Islands; T.
1 1 37 Hawaii, Juan Fernandez Islands, New Jersey, Brazil
REMARKS.—This species is restricted to Acanthocybium solandri and is probably found throughout the range of the host. Examination of this specimen and Heegaard's figures of the female lead us to believe that this species was erroneously placed by the author in the Euryphoridae. We did not collect this species, but we reproduced the figure of the female based on the illustration of Nunes-Ruivo and Fourmanoir.
MATERIAL EXAMINED.—43 collections containing $85 9 4 from the gills of the following hosts and localities: Thunnus tonggol from Pakistan, Gulf of Thailand; T. These conclusions are based on the comparative morphology, not only of the female, but on the first descriptions of males of P. As we have examined 97 specimens of the type host without recovering this species, we wonder whether previous hosts may have been misidentified.
In these cases, copepods normally found on the body surfaces of the hosts are lost. Elytrophora brachyptera Gerstaecker (Euryphoridae, Caligoida) from New Zealand Waters, with a preliminary revision of the genus.
Holobomolochus asperatus, new species, female: c, dorsal; d, genital segment and abdomen, dorsal; e, posterior abdominal segment and caudal branch, ventral; /, first antenna; g, second antenna.
62 SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY
P. capitulatus
N. kanagurta kO.aculeatus
B. thynni
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