Harris: Male antennule of porcellidiid copepods 
133 
Genus Kushia Harris & Iwasaki, 1996 
Kushia Harris & Iwasaki, 1996: 204.—Bodin, 1997: 68; 
Walker-Smith, 2001:655; Wells, 2007: 80. 
Porcellidium. —Gamo, 1969: 345; Kim & Kim, 1997: 161. 
Type species. Kushia zosteraphila Harris & Iwasaki, 1996. 
Diagnosis. Female P5 exopod with ventral expansion that 
lies under (ventral to) edge of genital double-somite (Fig. 
16E); male antennule with conspicuous anterior comb 
near 8 seta on segment 3, and three coupling denticles on 
segment 4 (middle denticle expanded distally, Y-shaped 
Fig. 18E, F), no brush-pad; hyaline border with sensilla at 
lateral edge of cephalosome, marginal glands conspicuous 
with ducts opening dorsal to border; no massive dorsal 
cuticular honeycomb; no ridge-plates on labrum; no lateral 
striations on female genital double-somite; female caudal 
rami pentagonal, typically widen posteriorly, terminal setae 
T1 to T4 all present, not pinnately clavate or evenly spaced; 
maxillule endopod with six setae; coxae of maxillipeds touch 
in mid-line; male P5 trapezoidal with six terminal setae; 
spermatophore elongate, ephemeral on female. 
Species composition. Kushia zosteraphila Harris & Iwasaki, 
1996; K gamoi Harris & Iwasaki, 1996; K igaguria Harris 
& Iwasaki, 1996; Kushia spathoides sp. nov. 
The genus is known from Japan, Korea and northern 
NSW, Australia. 
Etymology. The name Kushia refers to the characteristic 
anterior comb on male antennule, (Japanese Kushi a type 
of Japanese hair comb). 
Remarks. The genus is clearly defined by structure of 
male antennule and female P5 limb. The marginal glands 
possessed by all members of the Porcellidiidae are 
particularly conspicuous in the above four species. They also 
occur in other parts of the body such as the genital double¬ 
somite, caudal rami and P5 limbs. 
Key to the species of Kushia 
1 Hyaline border of cephalosome clear (not striated). Male 
cephalosome sharply truncated with angular shoulders . 2 
- Hyaline border with striations. Male cephalosome not sharply 
truncated, shoulders smoothly rounded. (Plate II, p. 163). K spathoides sp. nov. 
2 First dorsal seta on female P5 very small or absent. Truncated 
anterior of male cephalosome straight. No setules at base of 
terminal setae on male P5. 3 
- First dorsal seta on female P5 long, (same length as seta two & 
three). Truncated anterior of male cephalosome concave. Rows 
of 7-10 setules at base of each terminal seta on male P5. (Plate 
2D, p. 165). K zosteraphila Harris & Iwasaki, 1996 
3 Female caudal ramus with parallel sides*. Proximal denticle on 
segment 4 of male antennule flat with serrated edge. Colour¬ 
ation uniform pale orange-brown. K gamoi Harris & Iwasaki, 1996 
- Female caudal rami widen posteriorly*. Proximal denticle on 
segment 4 of male antennule rounded and covered with spine¬ 
like setules. Colouration pale yellow-brown with metasome and 
genital double-somite darker orange-brown. (Plate 2C, p. 165) 
. K igaguria Harris & Iwasaki, 1996 
* Caudal ramus laid flat. 
Kushia spathoides sp. nov. 
Figs 15-18, Plate II 
Type material. Holotype adult male, length 0.68 mm, 
P81204; allotype adult female, length 0.75 mm, P81205; 
paratype specimens, 5 $0,5 P81206, deposited at AM, 
Sydney. Additional paratypes deposited at NHM, London. 
All collected at Arrawarra Headland, Woolgoolga, northern 
NSW, Australia (30°06'S 153°02'E), washed from Caulerpa 
vesiculifera in coral rockpool, V. A. Harris, 1982. 
Diagnosis. Striations in hyaline border close to edge of 
cephalosome (Fig. 15E); male cephalosome rounded 
anteriorly (very slight truncation), shoulders smoothly 
rounded; anterior comb on male antennule short (length 
about twice width), small finger-like ventral process lies 
between anterior comb and n setae on segment 3 of male 
antennule (Fig. 18F), proximal coupling denticle on segment 
4 flat with serrate edge, middle denticle Y-shaped with plain 
edge, dactylus not bent or hooked distally; female caudal 
ramus widens posteriorly, T1 recessed at lateral corner to 
give ramus pentagonal appearance; dorsal seta 1 on female 
P5 exopod very small, seta 2 large (Fig. 16D). 
Biometric data. Females (N = 10): maximum length (L m ax) 
mean 0.75 mm, range 0.72-0.76 mm, body length (L ur s) 
mean 0.71 mm, range 0.69-0.72 mm; cephalosome width 
(W) mean 0.48 mm, range 0.45-0.51 mm; rostrum (R) 0.095 
mm; genital double-somite width 0.27 mm, length 0.20 mm; 
caudal ramus width (mean) 0.055 mm, length 0.11 mm. 
Ratios: L U r S AV 1.46, LmaxAV 1.54; cephalosome W/R 5.1; 
genital double-somite w/1 0.73, arch 40% of length; caudal 
ramus 15% of L U rs, 1/w 2.0, Hicks’ index for a 73%, for (3 55%. 
