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Records of the Australian Museum (2009) Vol. 61 
Figure 55. A-K, Spirobranchus paumotanus (continued from BMNH 1970.855). A-D, operculum of an adult specimen: (A-C), three 
right dorsolateral views; (D), dorsoanterior view; (E) a bayonet-shaped special collar chaeta; (F) long-shafted abdominal chaeta. G-K, 
juvenile specimen: (G) tube; ( H) right lateral view of anterior end of worm; (7) left lateral view of anterior end; (7) right dorsolateral view 
of operculum; ( K) abdomen. 
Based on a comparison of the number of radioles in 
relation to total length of worm, S. murrayi is apparently also 
a smaller species. The largest of the three specimens is only 
11.5 mm long, and its abdomen is 4.7 mm, comparatively 
broad (Fig. 53A), and has only 53 segments, but possesses 
27 radioles on the left side and 29 on the right; number 
of its radioles exceeds that, for example, a specimen of S. 
zibrowii, which is over twice its total length (26.8 mm), has 
an abdomen with 88 segments, but only 21 radioles on the 
left and 22 on the right. In the new species S. tenhovi, to be 
described later, a worm with a total length of 34.5 mm and 
having about 75 abdominal segments has 33 radioles on the 
left and 33 on the right. 
Etymology. Named after the Murray Expedition during 
which the specimens were collected. 
