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Records of the Australian Museum (2014) Vol. 66 
typical of family. Antenna (Fig. 14A) with row of triangular 
setules on basis, three lateral setae on endopod segment 2, 
end part of geniculate setae plain, terminal claw comb-like 
about l A length of endopod segment 2. Tips of molar process 
on mandible (Fig. 14B, C), maxillule (Fig. 1 ID, exopod not 
shown), maxilla (Fig. 14G) and maxilliped (Fig. 14E) as 
described for Porcellidium viride. Triangular first segment 
of PI endopod narrow (1/w = 1.3), very small peg field at 
lateral corner of fimbriate crescent (Fig. 141). Serrate spinous 
seta on segment 3 of P2 endopod almost as long as endopod 
(Fig. 15B). Serrate spinous seta on P3 endopod segment 2 
(Fig. 15C) as long as endopod, large serrate spinous seta on 
segment 3 longer than endopod (1.45:1). Seta on P4 endopod 
segment 2 and internal seta on segment 3 spinous, very finely 
serrulate (Fig. 15E). Internal seta on baseoendopod of P5 
K length of exopod, exopod lanceolate, dorsal surface with 
small pits, one subterminal and two apical setae present (Fig. 
15A, D). Number of eggs not known, none of the females 
is ovigerous. 
Adult males (Fig. 13B). Cephalosome truncated with 
rounded shoulders, anterior edge folded ventrally (Fig. 14F). 
Hyaline border and dorsal ornamentation as described for 
female. Ventral surface of cephalosome not wrinkled, but 
ventral surface of rostrum with U-shaped ridges or wrinkles 
(Figs 14F, 16A). Genital somite with dorsal pits and row 
of five sensilla on either side (Fig. 15G). Caudal ramus 
subquadrate (1/w = 0.8), lateral edge convex, medial edge 
straight, ends in slight bevel with T4 at comer, posterior 
border straight, T1 and y setae not recessed, (3 seta sub¬ 
terminal, fringe of fine border setules between T3 and T4 
(Fig. 16E). Antennule (Fig. 16B). No finely plumulose setae 
on segment 2, first seta less than 1.5 times length of second 
seta, segment 3 with knob or peg-like ventral process, no 
spine close to 8 seta, proximal coupling denticle on segment 
4 large finely denticulate pad, distal denticle with fine 
comb-like edge (Fig. 16B, C, D, F, G), segment 5 of dactylus 
almost as long as segments 3+4, concave on one side (Fig. 
16D), hooked distally (Fig. 16C), segment 6 inconspicuous. 
P2 endopod terminates in two plumose setae (Fig. 14H). 
P5 with short row of small setules at base of each terminal 
seta (Fig. 15F). 
Remarks. Bocquet (1948) describes two colour forms of 
P. lecanoides from Roscoff, Brittany, France. The first is 
uniform golden yellow, the second is golden yellow with 
narrow dark violet median stripe down back and caudal rami. 
Because of their colouration, shape of the caudal rami and 
statistical difference in size, the second form was considered 
a variety of Claus’ P. lecanoides and named P. lecanoides 
var. roscoffensis. Bocquet did not give a complete description 
of the new variety, but the specimens collected from 
Pembrokeshire conform precisely to Bocquet’s illustrations 
of the caudal rami plus genital double-somite and are 
considered to be the same species. However, P. lecanoides 
is a synonym for P.viride and the Pembrokeshire animals do 
not resemble P. viride. It is considered that Bocquet’s variety 
should be raised to specific rank as Porcellidium roscoffensis 
(Bocquet, 1948) comb. nov. 
The antennae of the two male specimens used in this 
description are either closed or in a position where critical 
observation of the coupling denticles is difficult. What can 
be seen is illustrated in Fig. 16. 
Distribution. Bocquet (1948) records the species as 
abundant on Bifurcaria tuberculata in tidal pools at Roscoff. 
It is also abundant in the Bay of Morlaix. Bocquet describes 
their colour as yellow with a band of violet down the back, 
but the colour of living animals from Pembrokeshire is not 
known. They were found among Porcellidium viride washed 
from a mixture of seaweeds many years after collection and 
were colourless. 
Genus Porcelloides gen. nov. 
Type species. Porcelloides tenuicaudus (Claus, 1860) comb, 
nov. 
Porcellidium tenuicauda. —Claus, 1860: 6-8. 
Diagnosis. Spermatophore of male reniform (kidney¬ 
shaped) with recurrent duct (Fig. 17A, 18C) deposited on 
dorsal side of female P5, firmly attached on its side by 
adhesive material, remains attached to female long after 
egg laying has started (semi-permanent), deposition of 
more than one spermatophore on female common; male 
antennule without denticle or ventral process on segment 
3, segment 4 with three coupling denticles, proximal 
denticle triangular with serrated edge, medial denticle large 
denticulate pad, distal denticle variable (brush-pad absent); 
outline of male and female body ovoid (egg-shape), anterior 
of male cephalosome not obviously truncated; hyaline 
border surrounds edge of cephalosome; female caudal ramus 
trapezoid or rhomboid; six setae on maxillule endopod, 
maxilliped coxae touch in midline; dorsal setae of female 
P5 pinnate, no ventral expansion to P5; male P5 trapezoid 
with one lateral and five terminal setae. 
Species composition. Porcelloides tenuicaudus (Claus, 
1860) comb, nov.; Porcelloides scutatus (Claus, 1889) 
comb. nov. 
Distribution. Genus known from Sicily, Mediterranean Sea; 
Roscoff, France; Scilly Islands; Ireland; Pembrokeshire, 
Wales; Scotland. 
Remarks. The animals named Porcellidium tenuicauda 
by Claus (1860) are excluded from the diagnosis for 
Porcellidium by apomorphic characters not possessed by 
P. viride. They must be moved to a new genus. The name 
Porcelloides (treated as masculine) is proposed for this new 
genus. Claus (1860) did not say why he chose the diminutive 
Porcellidium for the name of his new animal, but he might 
have been impressed by the way they conglobate just like 
Porcellio (the sow bug or woodlouse). 
