Pillai: Serpulid polychaetes from the Australian Kimberleys 
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Figure 17. A-K, Hydroides pseudexaltatus n.sp., from holotype AM W202930. (A) tube; ( B ) anterior end of worm showing operculum, 
radioles, and anterior abdominal tori almost meeting dorsally; (C,D) two other views of operculum; (E-I) bayonet-shaped special collar 
chaetae; (7) thoracic uncini; ( K) anterior abdominal uncini. 
pointed tips directed outwards (Fig. 18A-D,F). Infundibular 
lobes number 16, their simple pointed tips black and directed 
outwards (Fig. 18A-F). Radioles: 7 pairs, operculum on right 
and a rudimentary operculum on left; their pinnule-free tips 
long and slender, about Vs of total length of radiole. 
Chaetae. Special collar chaetae bayonet-shaped (Fig. 
18G-I) bear two divergent conical processes at the base 
of the blade, their tips almost pointed; one to a few small 
accessory teeth present between them; unserrated notch 
moderately long. Thoracic uncini saw-shaped, and bear 
about 6 or 7 teeth in a single row (Fig. 18J, right figure); 
anterior abdominal uncini similar, with 4 or 5 teeth (Fig. 
18J, left figure). Anterior abdominal uncinal tori: first 2-3 
pairs separated by a small gap, rest dorsolateral, as seen in 
available part of abdomen (Fig. 18A). 
