Owenia collaris Hartman, 1955

Yanez-Rivera, Beatriz, Tovar-Hernandez, Maria Ana, Galvan-Villa, Cristian Moises & Rios-Jara, Eduardo, 2020, Tubicolous polychaete worms (Annelida) from Bahia de Chamela Islands Sanctuary, Mexico, with the description of a new bamboo worm, Biodiversity Data Journal 8, pp. 57572-57572 : 57572

Owenia collaris Hartman, 1955

Owenia fusiformis collaris in Hartman 1955: 46, pl. 2, figs. 6-7.- Hartman 1963: 70.

Owenia collaris Hartman 1969: 493-494, figs 1-4.- Kudenov 1975b: 225.-- Blake 2000: 120-121, fig. 5.9.

Materials

Type status: Other material. Occurrence: catalogNumber: LEMA-PO155 ; recordedBy: Beatriz Yáñez-Rivera; individualCount: 2; Taxon: phylum: Annelida; class: Polychaeta; order: Sabellida; family: Oweniidae; genus: Owenia; Location: higherGeographyID: Pacific Ocean; higherGeography: Tropical Eastern Pacific; continent: America; islandGroup: Islas de Chamela; island: Isla La Colorada; country: México; countryCode: MX; stateProvince: Jalisco; municipality: La Huerta; maximumDepthInMeters: 6; verbatimLatitude: 19°32 ’23’’ N; verbatimLongitude: 105°05 ’31’’ W; Identification: identifiedBy: María Ana Tovar-Hernández; Event: samplingProtocol: Dredge; eventDate: June 26, 2013; year: 2013; month: 6; day: 26; habitat: Sand; fieldNumber: Site 17; Record Level: language: Spanish; institutionID: Universidad de Guadalajara; collectionID: Colección Biológica del Laboratorio de Ecosistemas Marinos y Acuicultura, Universidad de Guadalajara, México; institutionCode: UDG; collectionCode: LEMA

Description

Entire worms with 14-18 segments, 12-14 mm length, 0.4-0.7 mm width, tentacular crown 0.4-0.7 mm length. Prostomium with a short tentacular crown consisting of 8-12 basal branched trunks (Fig. 5 A-E). Anterior border of peristomium with brownish spots (Fig. 5 D-E). Eyes absent. First three chaetigers of thorax with notochaetae only, chaetiger 3 reduced, with notochaetae shifted dorsally. Segment 5 longest (Fig. 5 G). Dorsal glandular ridges absent. Dorsal abdominal groove present. Abdominal segments birrameous with capillary notochaetae and neuropodial minute uncini that form into tight bands that nearly encircle the body. These uncini have long shafts with two long, curved teeth situated side by side (Fig. 5 F). Pygidium with anal opening positioned dorsally. The largest specimens have oocytes in chaetiger 4.

Distribution

Puerto Peñasco, Sonora ( Kudenov 1975b) and Chamela Bay (present study).

Taxon discussion

Described with ocular spots ( Hartman 1955), but considered as absent in the re-description provided by Blake (2000). These spots are present in specimens from Bahía de Chamela (Figs. 5D-E).

Figures

Figure 5. Owenia collaris Hartman, 1955. A) Worm partially inside its tube, B) anterior region and tentacular crown, ventral view, C) tentacular crown, lateral view, D-E) internal details of tentacular crown and pigmentation, F) neuropodial uncini, G) entire worm, removed tube. Scale bars: A) 2 mm, B-E, G) 0.5 mm, F) 1000 x magnification.