Figure 9 in A graphically illustrated glossary of polychaete terminology: invasive species of Sabellidae, Serpulidae and Spionidae

Figure 9. (a) Single segments of Branchiomma bairdi (left 2 images) and Polydora haswelli (stained with methyl green) highlighted red. (b) Arrows indicate spinules on opercula of (left to right, respectively) Hydroides elegans, H. heteroceros and H. tambalagamensis. (c) Spirobranchus- type collar chaetae from Spirobranchus tetraceros (stained with methyl green). (d) Radioles of Branchiomma galei and Branchiomma bairdi; arrows indicate stylodes (palmate in B. galei and simple in B. bairdi). (e) Arrow indicates thoracic membrane of Spirobranchus cariniferus, stained with methylene blue. (f) Thorax regions (highlighted red) of (left to right, respectively) Bispira manicata, Spirobranchus cariniferus (stained with methylene blue) and Branchiomma bairdi. (g) Arrow indicates tonguelet of Spirobranchus cariniferus (stained with methylene blue), partially covered by collar. All scales in mm.