Perkinsiana antarctica Kinberg 1867

• Main Authors: Tovar-Hernández, María Ana, León-González, Jesús Ángel De, Bybee, David R.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Sabellida; Sabellidae; Perkinsiana; Perkinsiana antarctica; Antarc*; Antarctica; Tierra del Fuego
• Online Access: https://doi.org/10.5281/zenodo.6048878; http://treatment.plazi.org/id/EE3E87C6FF88A36AFF7FDC70FC2E5DEB

Perkinsiana antarctica (Kinberg, 1867), redescription ( Figs 17, 18, 33 A) Laonome antarctica Kinberg, 1867: 354.— Johansson 1922. Perkinsiana antarctica .— Knight-Jones 1983: 277 –279, fig. 14.— Giangrande & Gambi 1997: 268, figs 1–2.— Rios et al. 2007: 94.— Bremec et al. 2000: 195.— Tovar-Hernández et al . 2012: 59 –60. Material examined. ARGENTINA, UANL 8075: Puerto de Ushuaia, Tierra del Fuego, 54°48’S, 68°17’W, 2 m depth, dock fouling, 19 September 2005, coll. E. Schwindt, 5 specimens. CHILE, UANL 8076: Bahía Laredo, Magellan Straits, 2 m depth, 17 October 1994, 4 specimens, donated by A. Giangrande from those reported in Giangrande & Gambi (1997). Redescription. Trunk length 10–14 mm; width 2–3 mm. Branchial crown length 4–9 mm, with 12–15 pairs of radioles. Five–8 thoracic and 27–48 abdominal segments. Radioles with irregular brown bands in pinnules (Fig. 17 G) along entire radiole length; radioles lacking pigmentation. Palmate membrane absent. Radioles with narrow flanges along entire lengths (Fig. 17 H). Longest pinnules at mid-radioles. Radioles with short tips, as long as equivalent space of one pinnule (Fig. 17 H). Dorsal lips subulate (Fig. 17 F), as long as 1/4 branchial crown length or length of seven thoracic segments, erect, with distinct radiolar appendage and very narrow lateral lamellae, 2–3 dorsal pinnular appendages. Ventral lips broadly rounded (Fig. 17 F) without ventral pinnular appendages. Parallel lamellae present. Ventral sacs visible above collar ventral lappets (Fig. 17 D, E). Dorsal collar margins not fused to faecal groove (Fig. 17 B). Anterior peristomial ring even dorsally, exposed (Fig. 17 B). Ventral collar lappets distally rounded, not overlapping when specimens are contracted (Fig. 17 D) or slightly overlapping when specimens were preserved inside tubes (Fig. 17 E). Lateral collar margins oblique, slightly higher ventrally, not covering junction between anterior peristomial ring and branchial lobes (Fig. 17 C). Ventral shield of chaetiger 1 divided transversely, ...