Spiophanes australis Meissner & Schwentner & Göưing & Fiege 2023, sp. nov.

• Main Authors: Meissner, Karin, Schwentner, Martin, Göưing, Miriam, Fiege, Thomas Knebelsberger and Dieter
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2023
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Spionida; Spionidae; Spiophanes; Spiophanes australis; South Atlantic Ocean
• Online Access: https://doi.org/10.5281/zenodo.10497566; http://treatment.plazi.org/id/743EE917FFEDFF90FCA126721FB4F952

Spiophanes australis sp. nov. Meissner, Göfling and Fiege (Figs 13, 16, 17; Table 6) Type material: Holotype. South Atlantic Ocean , Argentine Basin, M 79-1 (DIVA 3), stn 533-1 EBS, 4602 m, 15 Jul 2009, one af fragmented into two pieces (21 chaetigers, 3.1 mm long, width 0.6 mm), original fixation formalin, now in 70% EtOH (SMF 30647). Paratypes: SW Atlantic Ocean , Argentine Basin, M 79-1 (DIVA 3), stn 533-1 EBS, 4602 m, 15 Jul 2009, four af original fixation formalin, now in 70% EtOH (SMF 30634 incl. one af SEM 1334); stn 534-1 EBS, 4608 m, 16 Jul 2009, six af, original fixation formalin, now in 70% EtOH (SMF 30632 incl. one af SEM 1335); stn 534-1 EBS, 4608 m depth, 16 Jul 2009, one af, fixed in 96% EtOH, tissue sample (SMF 32277). Measurements for largest paratype (SMF 30632) af of about 19 chaetigers, length ~ 3 mm, width ~ 0.6 mm (chaetae omiưed); other paratypes all af max. 21 chaetigers, between 0.9–4.7 mm long, 0.3–0.6 mm wide. Description: Holotype anterior fragment with 21 chaetigers, 0.6 mm wide and 3.1 mm long. Specimens between 0.3–0.9 mm in width, and up to 4.7 mm long, all anterior fragments of max. 21 chaetigers. Body slender, subcylindrical. Prostomium bell-shaped with straight anterior margin extending into short rounded anterolateral projections (Fig. 16A–C), short papilliform occipital antenna present (Fig. 16A). Dorsal ciliated organs (suggested to represent nuchal organs) as dorsal ciliated grooves posterior to the prostomium (ciliation detectable with SEM), if viewed with LM appearing as thick straight double lines of ochre or yellow colour reaching the end of 2nd chaetiger (Fig. 16B, C), sometimes outer margins of ciliated grooves demarcated and then appearing U-shaped. Eyes absent. Peristomium moderately developed. First parapodium oriented dorsolaterally, second laterally to almost completely laterally, thereaħer orientation of parapodia lateral (Fig. 16A– D). Postchaetal lamellae of chaetigers 1–4 narrow subulate in notopodia (Figs 16A, B, 17A), longest in first two to three ...