Pomatostegus Schmarda 1861

Genus Pomatostegus Schmarda, 1861 Type-species. Pomatostegus macrosoma Schmarda, 1861, by subsequent designation (Hartman 1959): 587–588, junior synonym of Terebella stellata Abildgaard, 1789. Diagnosis (from ten Hove & Kupriyanova 2009). Tube white, opaque, semi-circular to roughly triangular in crosssection, with up to five longitudinal keels; granular overlay absent. Operculum a very flat ampulla covered with chitinous disk bearing a column with several serrated disks alternating with circlets of spines proximally and closely applied to each disk. Peduncle flatly triangular in cross-section with broad latero-distal wings along its entire length; inserted to the left or right at the basis of the radiolar lobe; from the fact that the first and second radiole separated by the base of the peduncle, it is inferred that it is derived from the second normal radiole. Constriction absent. Pseudoperculum absent. Arrangement of radioles in (semi-)circles, up to 90 per lobe. Interradiolar membrane present. Radiolar eyes present. Stylodes absent. Mouth palps absent. Seven thoracic chaetigerous segments. Collar tri- to penta-lobed, well developed with an entire smooth margin. Tonguelets absent. Thoracic membranes short, ending just posterior to the second row of uncini (segment 3). Collar chaetae Spirobranchus - type, with basal pilose fin [= proximal boss] and distal blade, and limbate. Apomatus - type chaetae present. Thoracic uncini saw-shaped, with 9–13 teeth, anterior peg blunt. Thoracic tori meet ventrally in larger specimens; in juveniles the ventral space between thoracic tori narrowing towards last rows that almost fused, leaving a triangular depression. Abdominal chaetae flat narrow geniculate, with long blade. Abdominal uncini smaller than thoracic ones, with about eight teeth in profile, three teeth in a row. Achaetous anterior abdominal zone absent. Long posterior capillary chaetae absent, but posterior chaetae longer. Posterior glandular pad absent.
Published as part of Sánchez-Ovando, J. Pablo & Bastida-Zavala, J. Rolando, 2021, Redescription of Pomatostegus stellatus (Abildgaard, 1789) and P. kroyeri Mörch 1863 (Polychaeta: Serpulidae) from the Tropical American coasts, pp. 495-514 in Zootaxa 4970 (3) on page 497, DOI: 10.11646/zootaxa.4970.3.3, http://zenodo.org/record/4766736
{"references":["Schmarda, L. K. (1861) Neue Wirbellose Thiere beobachtet und gesammelt auf einer Reise um die Erde 1853 bis 1857. Turbellarien, Rotatorien und Anneliden. Verlag von Wilhelm Engelmann, Leipzig, 164 pp. https: // doi. org / 10.5962 / bhl. title. 85313","Hartman, O. (1959) Catalogue of the polychaetous annelids of the world. Part II. Occasional Paper Allan Hancock Foundation, 23 (2), 354 - 628. [http: // digitallibrary. usc. edu / cdm / ref / collection / p 15799 coll 82 / id / 19573]","Abildgaard, P. C. (1789) Beschreibung 1. Einer grossen Seeblase (Holothuria Priapus Linn.) 2. Zween Arten des Steinbohrers (Terebella Linn.) 3. Einer grossen Sandrohre (Sabella Linn.). Schriften der Gesellschaft Naturforschender Freunde, Berlin, 9, 133 - 146.","Hove, H. A. ten & Kupriyanova, E. K. (2009) Taxonomy of Serpulidae (Annelida, Polychaeta): the state of affairs. Zootaxa, 2036 (1), 1 - 126. [https: // www. mapress. com / zootaxa / 2009 / f / zt 02036 p 126. pdf] https: // doi. org / 10.11646 / zootaxa. 2036.1.1"]}