Hyalopomatus jirkovi Kupriyanova 1993

• Main Authors: Kupriyanova, Elena K., Bailey-Brock, Julie, Nishi, Eijiroh
• Format: Text
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Sabellida; Serpulidae; Hyalopomatus; Hyalopomatus jirkovi; Gulf of Alaska; Pacific; Kamchatka; Alaska
• Online Access: https://dx.doi.org/10.5281/zenodo.6189954; https://zenodo.org/record/6189954

Hyalopomatus jirkovi Kupriyanova, 1993 a (Fig. 5 A–B, H) Hyalopomatus jirkovi Kupriyanova, 1993 a: 147 –148, fig. 1. Material examined . Type material. SIO: R/V “ Vityaz ” Stn. 5593, 45 ° 38 ’N, 152 °02’E, 1050 m, 12 Aug 1966 (holotype and paratype). Newly examined material. SIO: R/V “ Vityaz ” Stn. 4131, 55 º47.6’N, 145 º19.7’W, 3949 m, trawl, 9 Nov 1958 (4 specs). Description. Tube : Tubes white, smooth, attached to the Cidaris throughout its length, circular in cross-section, some indication of interruptions in calcium carbonate secretion (see Sanfilippo 2009) along the tube. Branchial crown: 8–10 pairs of radioles, not joined by inter-radiolar membrane. Bases of branchial radioles short. Branchial eyes not visible in preserved material. Stylodes absent. Peduncle : inserted as 1 st dorsal radiole on left side of crown, thin, smooth, circular in cross-section. Constriction present. Pair of lateral wings proximal to opercular bulb and pseudoperculum absent. Operculum : semi-transparent elongated vesicle with slightly differentiated darker distal cap (Fig. 5 H). Collar and thoracic membranes : collar four-lobed, with ventral lobe additionally sub-divided into two round lobes by a deep incision; ventro-lateral lobes twice as long as latero-dorsal lobes (Fig. 5 A, B). Thoracic membranes reaching up to 3 rd chaetiger, of even width throughout (Fig. 5 A, B). Thorax : with six thoracic chaetigers, five of which uncinigerous (Fig. 5 A, B). Collar chaetae simple capillaries and special fin-and-blade chaetae, with wide blade continuing without a gap in proximal fin made of numerous small teeth. Remaining notochaetae with short wide distal limbate blade. Apomatus chaetae absent. Thoracic uncini rasp-shaped, with about 20 teeth in profile view, arranged in 3–4 transverse rows, and with elongated and flattened anterior peg (SEM details of peg structure not available). Abdomen : abdominal uncini similar to thoracic uncini but smaller with about 20 teeth in profile view. Straight, almost capillary (distal limbation very narrow) abdominal chaetae (SEM details not available). Colour : unknown. Remarks . This is the second record of this species previously known only from two specimens (the type material) collected from the Kurile-Kamchatka Trench. Hyalopomatus jirkovi clearly differs from all described species of Hyalopomatus by the structure of the collar with ventral lobe sub-divided into two lobes by deep incision at midline. Distribution . Kurile-Kamchatka Trench, Gulf of Alaska, 1050–3949 m. : Published as part of Kupriyanova, Elena K., Bailey-Brock, Julie & Nishi, Eijiroh, 2011, New records of Serpulidae (Annelida, Polychaeta) collected by R / V " Vityaz " from bathyal and abyssal depths of the Pacific Ocean, pp. 43-60 in Zootaxa 2871 on pages 56-57, DOI: 10.5281/zenodo.203385 : {"references": ["Kupriyanova, E. K. (1993 a) Deep-water Serpulidae (Annelida, Polychaeta) from the Kurile-Kamchatka Trench: 1. Genus Hyalopomatus. Zoologichesky Zhurnal, 72, 145 - 152. (In Russian).", "Sanfilippo, R. (2009) New species of Hyalopomatus Marenzeller, 1878 (Polychaeta, Serpulidae) from Recent Mediterranean deep-water coral mounds and comments on some congeners. Zoosystema, 31, 147 - 161."]}