Hyalopomatus Marenzeller, 1878

Ten Hove, Harry A. & Kupriyanova, Elena K., 2009, Taxonomy of Serpulidae (Annelida, Polychaeta): The state of affairs, Zootaxa 2036, pp. 1-126 : 50-52

15. Hyalopomatus Marenzeller, 1878

( Fig. 22)

Type-species: Hyalopomatus claparedii Marenzeller, 1878

Number of species: 11 or 12

Tube white, opaque, sometimes with external hyaline layer, but granular overlay absent; (semi) circular in cross-section. Tabulae may be present. Operculum globular, soft, without distinct endplate or consisting of proximal ampulla with slightly chitinized distal cap; well separated from peduncle by constriction; sometimes operculum absent. Peduncle very thin, cylindrical, smooth, without wings; inserted outside branchial crown proper in front of first dorsal radiole on one side. However, for H. langerhansi we observed “between base of first and second radiole”. Pseudoperculum absent. Arrangement of radioles short pectinate, up to 15 pairs of radioles. Inter-radiolar membrane absent. Branchial eyes rarely present. Stylodes absent. Mouth palps present. 6 thoracic chaetigerous segments. Collar trilobed, tonguelets absent. Thoracic membranes short, ending at first or second thoracic chaetiger. Collar chaetae fin-and-blade ( Fig. 22A), or without gap between fin and blade and thus with uniform distal denticulate wing, and limbate. Apomatus chaetae absent (contrary to Ben- Eliahu & ten Hove 1989). Thoracic uncini rasp-shaped with numerous small teeth, approximately 20 in profile, up to 9 teeth in a row above peg; anterior peg made of two rounded lobes with a shallow incision in between, flat or slightly gouged in the middle ( Fig. 22B). Triangular depression absent. Abdominal chaetae almost capillary with only tip flat narrow geniculate with pointed teeth ( Fig. 22D); uncini rasp-shaped, similar to thoracic ones, but their anterior peg with 3–4 flat rounded lobes ( Fig. 22C). Achaetous anterior abdominal zone may be present. Posterior capillary chaetae present. Posterior glandular pad absent.

Remarks. This genus is poorly known probably because it includes mainly bathyal and abyssal species. Zibrowius (1969a) revised the genus to include six species. Kupriyanova (1993c) described three new species and provided a key to all species known at that time. More recently, three new species were added to the genus, H. variorugosus Ben-Eliahu & Fiege (1996) , who also discuss the then known species, the nonoperculate H. cancerum Knight-Jones et al. (1997) and H. madreporae Sanfilippo (2009) , known by tubes only. Non-operculate specimens of Hyalopomatus , apparently accidental, were reported in the review by Zibrowius (1969a: 13).

1. Hyalopomatus biformis ( Hartman, 1960) , S. California

2. Hyalopomatus cancerum Knight-Jones et al., 1997 , off Oman

3. Hyalopomatus claparedii Marenzeller, 1878 , Arctic; bathyal

4. Hyalopomatus jirkovi Kupriyanova, 1993c , Kurile-Kamchatka trench; abyssal/hadal

5. Hyalopomatus langerhansi Ehlers, 1887 , off Cuba; compare H. sombrerianus

6. Hyalopomatus macintoshi ( Gravier, 1911) , Antarctic

7. Hyalopomatus madreporae Sanfilippo, 2009 , Mediterranean

8. Hyalopomatus marenzelleri Langerhans, 1884 c , Canary Islands to S. off Ireland,?Mediterranean 9. Hyalopomatus mironovi Kupriyanova, 1993 , Kurile-Kamchatka trench, off California; abyssal/hadal 10. Hyalopomatus nigropileatus ( Ehlers, 1900 c) , South Chile, Antarctica

11. Hyalopomatus sikorskii Kupriyanova, 1993c , Kurile-Kamchatka trench; abyssal/hadal

12. Hyalopomatus sombrerianus ( McIntosh, 1885) , off Sombrero, St. Thomas, Caribbean; compare H. langerhansi

13. Hyalopomatus variorugosus Ben-Eliahu & Fiege, 1996 , Mediterranean, Atlantic.