Tetreres Caullery, 1913

Chávez-López, Yessica, 2022, New species of sabellariids (Annelida: Sabellariidae) from the Caribbean Sea and the Gulf of Mexico, European Journal of Taxonomy 831, pp. 109-148 : 138-139

Genus Tetreres Caullery, 1913

Type species

Hermella varians Treadwell, 1901 ; by original designation.

Diagnosis

Operculum with lobes partially fused. Two rows of opercular paleae. Outer paleae arranged in semicircles, blades straight, flat. Few (4–5) cylindrical inner paleae in single short row on ventral side of operculum, with blades straight, flat. One pair of large nuchal hooks with tips pointing inwards towards the prostomium. Tentacular filaments arranged in single rows (simple). Median organ small, conical at dorsal junction of opercular lobes. Palps grooved, longer than operculum. Four parathoracic segments ( Kirtley 1994; Capa et al. 2012).

Key to species of Tetreres Caullery, 1913 from the Caribbean Sea

1. Outer paleae lanceolate, six times as long as wide, with long slender tip ( Fig. 18A–B ) ................... ........................................... T. israeli sp. nov. Northeast United States Virgin Islands, 4180 m depth

– Outer paleae oblong, three times as long as wide ( Fig. 21A–B ) ...................................................... 2

2. With about ten thin tentacular filaments on each opercular lobe ........................................................ ...................... T. varians (Treadwell, 1901) . Mayagüez, Harbor, Puerto Rico, 177.4–219. 5 m depth

– With five broad tentacular filaments on each opercular lobe ( Fig. 20D ) ............................................ ................................................ T. oscari sp. nov. Southeastern Key West, Florida, 288–378 m depth

Figures

Fig. 18. Tetreres israeli sp. nov., holotype (UMML-22.1195). A. Complete specimen, dorsal view. B. Anterior region, dorsal view. C. Anterior region, lateral right view. D. Anterior region, ventral view. E. Paratype (UMML-22.1196). F. Operculum of the paratype. Abbreviations: ip = inner paleae; nh = nuchal hooks; op = outer paleae. Numbers indicate the tentacular filaments. Scale bars: A, C–E = 2 mm; B = 1 mm; F = 0.5 mm.

Fig. 21. Tetreres oscarisp. nov., holotype (UMML-22.1197). A–B. Outer palea.C-D. Inner palea.E. Nuchal hook, lateral view. F. Nuchal hook, ventral view. G. Tip of nuchal hook. H. Parathoracic notochaetae. I. Abdominal parapodium.J. Uncini. K. Tube. Abbreviation: Li = limbation. Numbers indicate the rows of teeth. Scale bars: A, D, G–I = 100 µm; B = 50 µm; C, E–F = 200 µm; J = 20 µm; K = 2 mm.

Fig. 20. Tetreres oscari sp. nov., holotype (UMML-22.1197). A. Complete specimen, dorsal view. B. Anterior region, dorsal view. C. Anterior region, lateral right view. D. Anterior region, ventral view. E. Last abdominal segments. F. Opercular crown, upper view. Abbreviations: c2 = cirri 2nd thoracic segment; ip = inner paleae; mo = median organ; nh = nuchal hooks; opa = opercular papillae; op = outer paleae. Numbers indicate the tentacular filaments. Arrows indicate gametes. Scale bars: A = 1 mm; B–D = 0.5 mm; E–F = 0.2 mm.