Metavermilia zibrowii
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Ordo: Sabellida
Familia: Serpulidae
Genus: Metavermilia
Name
Metavermilia zibrowii Bailey-Brock, Julie H., 2012 – Wikispecies link – Pensoft Profile
- Metavermilia zibrowii Bailey-Brock, Julie H., 2012, Zootaxa 3192: 50-52.
Materials Examined
Material examined. Holotype: Cross Seamount, Hawaii, “Moana Wave” cruise leg 13, dredge haul 2, 18 °47.52’N 158 °13.73’W, HURL, 12 / 16 / 1981, 2,013 m (USNM1156950); Paratype: same location and date as holotype (1, BPBM R 3557).
Description
Description.TUBE: Rugged white tubes with broad lateral flanges and ascending mouth in one specimen (Figs 1 A; 2 A), terminating with a thin flared lip. Four or five uneven longitudinal ridges present, not forming teeth, with narrow transverse ridges between them (Figs 1 B, C; 2 A). Tubes measured about 25 mm in length and 2–3 mm in width. One specimen removed from the tube measures 13 mm in length, excluding branchial crown. BRANCHIAE: Branchial crown with 12–13 radioles on either side; the second (modified) radiole on left or right side bearing the operculum. PEDUNCLE: Opercular peduncle flat and wrinkled (Figs 1 D, E; 2 B). OPERCULUM: Operculum composed of a funnel-shaped ampulla with chitinous concave opercular plate, brown to yellow in color (Figs 1 E; 2 B). COLLAR and thoracic membranes: collar trilobed; thoracic membrane extending to between chaetigers 6 and 7; apron absent. THORAX: with collar chaetiger and 6 uncinigerous chaetigers. Collar chaetae limbate and narrowly winged capillaries (Figs 1 F, G; 3 A); thoracic chaetae limbate (Fig. 1 H), more numerous than collar chaetae, capillaries (Fig. 1 I) and Apomatus chaetae with a small limbate zone from chaetiger 3 (Fig. 3 A shows basal part of Apomatus chaeta in Fig. 1 J and Fig. 3 B showing distal part of same Apomatus chaeta). Thoracic uncini saw-shaped with up to 11 teeth including rounded anterior fang (Figs 1 K; 3 C). ABDOMEN: composed of about 80 chaetigers, with two kinds of chaetae and uncini. Abdominal chaetae with flat narrow geniculate blade (Fig. 1 L), 2 per fascicle, except for posterior-most chaetigers with long capillaries (Fig. 1 M; 3 D, E). Abdominal uncini saw-shaped in most chaetigers with 8 or 9 teeth including a simple anterior tooth (Fig. 1 N) and rasp-shaped in posterior-most chaetigers (Fig. 1O) with about 15 rows of teeth, 4–6 teeth per row and a rounded anterior fang. Glandular pad present on last abdominal segments and composed by several rounded structures with calcium carbonate crystals protruding from a shallow pit (Fig. 3 F).
Discussion
Remarks. The two specimens agree with the generic characters given by Zibrowius (1971), Nishi et al. (2007) and ten Hove & Kupriyanova (2009), where a flat and ribbon-like opercular stalk is present. The new species resembles Metavermilia annobonensis (Augener, 1914) in most cases (e.g. tubes with 4–5 irregular longitudinal ridges and operculum with a concave distal plate), but differs in the number of teeth in the thoracic uncini, 7 according to Zibrowius (1971), 11 (but see Fig. 3 C) in the Hawaiian specimens; thoracic membrane extends to thoracic chaetigers 3–4 according to Zibrowius (1971) and Nishi et al. (2007) for M. annobonensis, but thoracic membrane extends to between chaetigers 6 and 7 in the Hawaiian material.
Etymology
Etymology. The species is named for Dr. Helmut Zibrowius who kindly examined my notes and illustrations (JB-B) of these Hawaiian specimens and offered advice on their diagnosis.
Distribution
Distribution. Cross Seamount in the Hawaiian Chain, 2,013 m.
Taxon Treatment
- Bailey-Brock, Julie H.; Magalhães, Wagner F.; 2012: A new species and record of Serpulidae (Annelida: Polychaeta) from Cross Seamount in the Hawaiian Chain, Zootaxa 3192: 50-52. doi
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