Zootaxa, Taxonomy of Serpulidae (Annelida ... - Magnolia Press

FIGURE 42. SEM micrographs of chaetae in Pyrgopolon ctenactis. The Netherlands Antilles, Bonaire, North of Witte
Pan, legit H.A. ten Hove, Sta. 2117, ZMA V.Pol. 4969. A—middle abdominal uncini, B—same as A, detail of pegs,
C—1 st row of thoracic uncini, D—detail anterior abdominal chaeta with double row of teeth.
entirely calcified; with an extremely long calcareous talon embedded into the tissue of the peduncle that is
inserted medially. Pseudoperculum absent. Radioles arranged in semi-circles, up to 38 per lobe, united by
inter-radiolar membrane for 1/4–1/2 of their length, surrounding pair of well-developed mouth palps.
Branchial eyes have not been observed but the brim of the skin around the operculum is scalloped, due to a
circle of compound eyespots (Fig. 6B). Stylodes absent. 7 thoracic chaetigerous segments, though collar
chaetae generally missing. Collar with large, bilobed ventral part; tonguelets between lateral and ventral collar
lobes present. Thoracic membranes very wide anteriorly, narrowing at 3 rd or 4 th segment, and united ventrally
on first abdominal segment forming an apron. Collar chaetae (if present) Spirobranchus-type and limbate.
Apomatus chaetae absent. Thoracic uncini saw-shaped, with 8–9 teeth, anterior peg bluntly truncated,
indented anteriorly (Fig. 42C). Thoracic tori almost touching ventrally in posterior thoracic segments of larger
specimens, leaving a clear triangular depression. Abdominal chaetae almost capillary, with short hollow
trumpet-shaped tips, smoothly bent and with double row of pointed teeth extending in long lateral spine (Fig.
TAXONOMY OF SERPULIDS: STATE OF AFFAIRS
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