Harris: Male antennule of porcellidiid copepods 
145 
Serrate spinous seta on P3 endopod segment 2 as long as 
endopod (Fig. 21 A), large serrate spinous seta on segment 
3 of endopod very long (1.5:1). Endopod of P3 and P4 with 
internal seta on segment 1, one plain spinous setae on P4 
segment 2 and 3 (Fig. 2IB). P5 exopod broad, truncated 
posteriorly, appears almost rectangular when laid flat, first 
dorsal seta small, two small apical setae, dorsal surface with 
pits (Fig. 20E). Females carry four or five very large eggs 
in brood chamber (eggs measure 0.1 x 0.06 when first laid). 
Adult males (Fig. 22A), colouration same as female. 
Anterior outline of cephalosome a truncated semi-ellipse 
with small bulge above rostrum, shoulders rounded (Fig. 
22C). Rostrum with conspicuous oval lens-like body just in 
front of eyespot seen from ventral view (Fig. 22B). Dorsal 
pits and hyaline border same as female. Caudal ramus (Fig. 
19C) slightly longer than broad (1.15:1), lateral edge convex, 
posterior border between T2 and T4 slightly concave with 
border of fine setules, T4 set in from medial corner, T2 
small, T3 very small, thin and very close to T2 (Fig. 22F). 
Antennule (Fig. 22E) with plumose seta on segment 1, no 
plumose setae on segment 2, no ventral process or blade, 
distal coupling denticle with C-shaped edge accompanied 
by a pinnate seta (Fig. 22D), dactylus elongate, cylindrical. 
Male P2 endopod (Fig. 2IE) with two or four plumose setae 
(Fig. 2IF, see Remarks below). Male P5 exopod trapezoid, 
no setules at base of terminal setae (Fig. 20F). 
Etymology. The species name refers to the smaller red dot 
on the cephalosome and a larger red area on the metasome 
segments. 
Remarks. The exopods of female P5 limbs wrap round and 
touch the bevelled edge of the caudal rami, consequently the 
delicate T2 and T3 setae are frequently broken off and not 
always seen. This gives the impression that T3 is missing in 
this species. Critical examination of recently metamorphosed 
females confirm that both T2 and T3 are present in this 
species. 
During measurement of the eleven male animals it was 
noticed that seven specimens had two plumose terminal 
setae to segment 3 of P2 endopod, but four animals had four 
terminal setae (one serrulate spinous seta plus three plumose 
setae). Because four terminal setae is the normal condition 
for all female animals in the Porcellidiidae, this unusual 
observation probably indicates a case of paedomorphosis. 
The presence of four terminal setae on male P2 has only been 
recorded for two other species, Dilatatiocauda tristanensis 
(Wiborg, 1964) and D. plana (Tiemann, 1977), see Harris 
( 2002 ). 
Distribution. Acutiramus bipunctatus is abundant on 
Halimedia sp., Zonaria sp., and Eucheuma sp., at Point 
Vernon, Hervey Bay, Queensland, but it is also found in small 
numbers on Caulerpa sp., Lethesia and Martensia spp., in 
the same locality. The type series, PV6.7/97, contains 78 
9? (70 with eggs), 41 <5$, 5 juveniles. Sample PV7. 8/97 
from Eucheuma denticulata contains 407 9?, 119 cj cj + 6 
SS coupled with juvenile, V. A. Harris, 1997. 
Acutiramus edenensis sp. nov. 
Figs 23-25 
Type material. Holotype adult male, length 0.48 mm, 
P81201; allotype adult female, length 0.68 mm, P81202; 
paratype material, 5 9S ? 3 SS, 1 S coupled to juvenile + 
2 juveniles, P81203, deposited at AM, Sydney. Additional 
paratypes deposited at NHM, London. All collected from 
Ecklonia radiata at Arrawarra Headland, Woolgoolga, 
northern NSW (30°03'S 153°02'E), V. A. Harris, 1982. 
Diagnosis. No plumose setae on segment 2 of male 
antennule, anterior lobe with 8 on segment 3 long, finger¬ 
like, ventral blade absent, coupling denticles on segment 4 
with serrated edge (Fig. 25G), dactylus broad with terminal 
claw-like hook and large lateral indentation (Fig. 25B, C); P3 
endopod with internal seta on segment 1; rostrum prominent, 
without “lens”, no median anterior bulge to cephalosome; 
male shoulders rounded, no epaulette; lateral edge of female 
caudal ramus slightly convex, posterior half of medial edge 
with setules, terminal setae plain, T1 as large as T4, T2 
and T3 close together, not parallel to posterior edge, space 
between T3 and T4 about Y% length of oblique posterior 
edge, a and (3 not close (A length of ramus apart); female 
P5 exopod truncated lanceolate; male spermatophore very 
small (< 15% of body length). 
Biometric data. Females (N = 20): maximum length (L m ax) 
mean 0.67 mm, range 0.63-0.72 mm, body length (L U rs) 
mean 0.64 mm, range 0.59-0.69 mm; cephalosome 0.42 
mm, range 0.40-0.44 mm; rostrum width 0.115 mm; genital 
double-somite width 0.23 mm, length 0.16 mm, height of 
arch 0.09 mm; caudal ramus length 0.78 mm, width 0.28 mm. 
Ratios: L U rs/W 1.52; W/R 3.5; genital double-somite w/1 
1.47, arch 56% of somite length; caudal ramus 12% of body 
length (L U rs), caudal ramus 1/w 2.8, Hicks index for (3 53%. 
Males (N = 15): maximum length (L m ax) mean 0.49 mm, 
range 0.45-0.51 mm, body length (L U rs) mean 0.47 mm, 
range 0.44-0.49 mm; cephalosome width 0.35 mm; caudal 
ramus length 0.02 mm, width 0.018 mm; antennule fully 
extended 0.15 mm; spermatophore 0.06 mm x 0.018 mm. 
Ratios: L U rs/W 1.35; caudal ramus 1/w 1.1; antennule 32% 
of body length (L U rs), antennule segment 2 23%, segment 
3+4 40%, dactylus 33% of antennule length; spermatophore 
12 % of body length (L ur s). 
Description. Adult females (Fig. 23A): colourless, 
anterior outline of cephalosome semicircular, rostrum 
prominent, no median bulge above rostrum, no lens-like 
structure in rostrum. Dorsal pits small 2-3 pm, hyaline 
border granulated, 8-10 pm wide (Fig. 25E). Very few 
dorsal sensilla. Genital double-somite (Fig. 23F) almost 
semicircular in outline without anterolateral ridge, notch and 
short cleft mark boundary between anterior and posterior 
lobes, posterior lobe about 30% of lateral edge, arch of 
genital double-somite deep, accommodates more than 3 A of 
caudal furca. Genital opening as shown in Fig. 23E. Caudal 
ramus (Fig. 23B) rhomboid, length about 2 Vi times width, 
medial edge straight with fine setules from level of (3 to T4, 
lateral edge slightly convex with border setules distally, a 
and (3 setae not close,terminal setae plain, T2 and T3 very 
close together, space between T3 and T4 with fine setules, 
A length of oblique posterior edge, T4 inserted at rounded 
posterior apex. No plumulose setae on antennule. Structure 
