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Records of the Australian Museum (2009) Vol. 61 
Figure 10. SEM of Megalomma cf. miyukiae, AM W35502: (A) anterior thoracic chaetiger and posterior peristomial ring collar, ventral 
view; ( B ) same, dorsal view; (C) notochaetae, first chaetiger, ventral view; (D) inferior thoracic chaetae, anterior chaetiger, ventral view; 
(E) whole fascicle; (F) thoracic uncini; (G) abdominal uncini; ( H) companion chaetae; (/) anterior abdominal neurochaetal fascicle. 
Colour pattern. Body slightly pigmented anteriorly, 
particularly the collar, ventral shields, and ventral margins 
of parapodial tori, although tori unpigmented. Base 
of crown and anterior margin of peristomium dorsally 
coloured; radioles with some transverse irregular bands 
and with some pinnules pigmented. 
Remarks. The identification of this species in Australia 
should be confirmed with more material in better condition. 
Some features, such as separation of the dorsal margins of 
the collar from the faecal groove, the presence of vestigial 
pockets of the collar and the presence of subdistal eyes in 
only a few dorsal radioles agree with the original description 
of M. miyukiae, described from Thailand (Nishi, 1998). But 
there are some differences between these specimens and 
the types of M. miyukiae. Vestigial pockets of the collar are 
present on the specimens described herein, and although 
we consider this a feature that might be overlooked and 
interpreted as “pockets absent” when there is no fusion of 
collar with the faecal groove, Nishi (1998) is aware of the 
possibility of vestigial pockets being present as he states in 
Remarks when comparing his new species to others, that 
M. heterops Perkins, 1994, “has vestigial pockets joining 
ridges and dorsolateral margins”, and mentions that only a 
“small bulge” is present on M. miyukiae specimens. In the 
absence of examination of type material of M. miyukiae, 
we can only assume that our specimens differ from M. 
miyukiae in this character. The first ventral shield is not as 
long as twice the length of the following shields, and also 
radiolar tips are longer than pinnules except for the ones 
bearing compound subdistal eyes, but these differences 
could be due to intraspecific variation. These specimens 
should also be compared with M. kaikourense, described 
from New Zealand, as they share some features such as 
