Ammotrypanella cirrosa Schüller, 2008, sp. nov.

• Main Author: Schüller, Myriam
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2008
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Opheliidae; Ammotrypanella; Ammotrypanella cirrosa; Antarc*; Antarctic; Antarctic Peninsula; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.5615900; http://treatment.plazi.org/id/03DB87D63B54E71BFF7DF9B230C3E53E

Ammotrypanella cirrosa sp. nov. (Fig. 3A–B) Holotype. ANDEEP I–II, Weddell Sea, Antarctic Peninsula, Sta. 131-3, 0 5 March 2002, 65°19.83’S, 51°31.62’W, 3049–3050 m, EBS, ZMH P- 24751. Paratypes. ANDEEP I–II; Weddell Sea, Antarctic Peninsula, Sta. 131-3, 0 5 March 2002, 65°19.83’S, 51°31.62’W, 3049–3050 m, EBS, 63 specimens, ZMH P- 24752. Additional material. 42-2 (4), 134-4 (2), 141-10 (1), 16-10 (6), 59-5 (2), 78-9 (2), 102-13 (4), 110-8 (1), 121-11 (40), 153-7 (4), 154-9 (1). Etymology. The name refers to the presence of numerous small cirri and a large ventral cirrus on the posterior margin of the anal tube. Diagnosis. The species can be recognized by the presence of a thick ventral cirrus and numerous small cirri on the posterior margin of the anal tube. Description. Holotype complete, body long and thin, 16 mm long and 1.5 mm wide for 40 chaetigers. A median species of 7–25 mm length and 0.5–2 mm width; number of chaetigers 37–42. Ventral groove present along whole length of body. Posterior body region bilaterally flattened. Color in alcohol white to a light tan. Prostomium conical ending in a short palpode. Peristomium indistinct, a thin ring around the lips. First subsequent segment without chaetae. Nuchal organs apparent as narrow grooves laterally, eyes absent (Fig. 3A). Anterior 7–8 parapodia button shaped, chaetae long, stiff, in bushy fascicles. Median parapodia embedded in lateral groove, becoming more distinct in posterior part of body; posterior chaetae long and straight. All chaetae simple. Branchiae flat with wide base, tapering to top; all of similar length; present in region from chaetigers 23– 31, exact number variable. Posterior chaetigers shorter, close to each other. Pygidium with anal tube; length of anal tube about that of last 5–8 chaetigers; posterior margin with few short cirri; ventral cirrus robust, about half the length of anal tube (Fig. 3B). Remarks. The species is most similar to Ammotrypanella arctica . The most apparent diagnostic difference is the presence of a robust ...