Progoniada regularis Haartman 1965
Creators: name: Meissner, Karin
name: Schwentner, Martin
name: Göưing, Miriam
name: Fiege, Thomas Knebelsberger and Dieter
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Phyllodocida
Goniadidae
Progoniada
Progoniada regularis

description: Progoniada cf. regularis Hartman, 1965
(Fig. 11A–G)
Progoniada regularis Hartman, 1965. – Böggemann 2009: 312– 315, figs 46D (neuropodial chaeta), table 7, specimen ZMH-P 25157. – Böggemann 2016: 239–240, fig. 10B–I (anterior to posterior parapodia), specimen SMF 23791.
? Progoniada sp. Böggemann and Sobczyk in Gunton et al. 2021: 47, fig.11, B, D, E.
Material examined: Central Atlantic Ocean, Mid-Atlantic Ridge, East, SO 237 (VEMA Transit), station 4-8, 5737 m (ZMH-P 26694, bad condition). SW Atlantic Ocean, Brazil Basin N, M 79-1 (DIVA 3), station 605-1, 5189 m (SMF 23791, SEM 1339). SE Atlantic Ocean, Angola Basin, M 63-2 (DIVA 2), station 45-5, 5647 m (ZMH-P 25157a(SEM) + 25157b). – for details and additional specimens see the Supporting Information, Table S2.
Measurements largest specimen studied: Central Atlantic (SMF 23791): length 25 mm, width 0.6 mm, 84 chaetigers.
Description: (Based on specimen SMF 23791.) Prostomium with eight indistinct annulations (Fig. 11F). Tip with biarticulate appendages. Eyes absent. Proboscis with paired lateral rows of chevrons (15) (Fig. 11D) and doưed with several rows of small cordiform papillae (Fig. 11E). Macrognaths with three to four tips. Nine micrognaths arranged in dorsal arc as x-shaped or jointed H + w-shaped pieces and one to two larger jointed H + w-shaped pieces located ventrally (Fig. 11A–C).
Parapodia all uniramous (Fig. 11G). Prechaetal lobe long, digitiform; postchaetal lobe short, rounded. First segment apodous and with lateral cirri only. Dorsal and ventral cirri digitiform with pointed tip. Ventral cirri slightly longer than dorsal ones. Chaetae compound falcigers and spinigers with long blade (Fig. 11G).
Remarks: The specimen collected from the eastern central Atlantic (ZMH-P 26694) is in very bad condition, unsuitable for morphological description. However, the specimens listed here can be separated from specimens of P. regularis based on our genetic results. The specimens collected from Angola Basin (ZMH-P 25157) and Brazil Basin (SMF 23791, SEM stub 1339) were originally included in descriptions of Progoniada regularis Hartman, 1965 by Böggemann (2009, 2016)), respectively. Our molecular data strengthen the view of Böggemann (2009: 318, fig. 48) that P. regularis probably is a complex of cryptic or sibling species. Because our morphological studies of the specimens listed did not reveal significant differences to P. regularis, we refrain from describing a new species solely based on genetic differences.
Distribution: Eastern Central Atlantic (VEMA Fracture Zone) (5735 m, this study), SW (Brazil Basin) and SE Atlantic (Angola Basin) (5189 and 5647 m, respectively) (Böggemann 2009, 2016) (Fig. 3).
Magelonidae Cunningham & Ramage, 1888
description: Published as part of Meissner, Karin, Schwentner, Martin, Göưing, Miriam & Fiege, Thomas Knebelsberger and Dieter, 2023, Polychaetes distributed across oceans-examples of widely recorded species from abyssal depths of the Atlantic and Pacific Oceans, pp. 906-944 in Zoological Journal of the Linnean Society 199 on page 925, DOI: 10.1093/zoolinnean/zlad069, http://zenodo.org/record/10470369