Pseudoscalibregma Ashworth 1901
Creators: name: Mendes, Samuel Lucas Da Silva Delgado
name: Paiva, Paulo Cesar De
name: Rizzo, Alexandra E.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Opheliida
Scalibregmatidae
Pseudoscalibregma

description: Key to Pseudoscalibregma Ashworth (1901) species, with type localities of each species
1. Peristomium papillated.................................... P. hartmanae (Blake, 1981); Weddel Sea, Antarctica
- Peristomium without papillae........................................................................ 2
2(1). Nuchal crest present on prostomium posterior margin... P. bransfieldium (Hartman, 1967); Bransfield strait, Antarctica.
- Prostomial nuchal crest absent....................................................................... 3
3(2). Spinous chaetae absent................................. P. glandulopodia Blake, 2023; Australia, Pacific Ocean.
- Spinous chaetae present............................................................................ 4
4(3). Lyrate chaetae from chaetiger 2...................................................................... 5
- Lyrate chaetae from chaetiger 3...................................................................... 8
5(4). Interramal papillae absent..................... P. papilia Sch ̧ller, 2008; South Sandwich Islands, Southern Atlantic.
- Interramal papillae present.......................................................................... 6
6(5). Spinous chaetae with bifurcated tips..................... P. parvum (Hansen, 1879); Norwegian Sea, North Atlantic. Spinous chaetae with single pointed tips............................................................... 7
7(6). Rounded prostomium with short cylindrical horns; smooth proboscis; parapodial cirri initially rounded, progressively thinner and pointed on posterior chaetigers; chaetiger 1 biannulated, chaetigers 2-3 triannulated, then chaetigers quadriannulated........................................................ P. parapari sp. nov. South Atlantic
- Squared to trapezoidal prostomium with strong conical horns; papillated proboscis; all parapodial cirri digitate; all chaetigers biannulated................................. P. orientalis Imajima, 2009; Kashima Sea, Pacific Ocean.
8(4). Horns shorter than the half of prostomium width.............................. P. ermindae sp. nov. South Atlantic
- Horns longer than half prostomium width.............................................................. 9
9(8). Chaetiger 1 quadriannulated; parapodial cirri always smaller than parapodial lobes......................................................................................... P. usarpium Blake, 1981; Ross Sea, Antarctica.
- Chaetiger 1 triannulated or biannulated; parapodial cirri longer than parapodial lobes, at least on posterior chaetigers... ............................................................................................... 10
10(9). Squared prostomium; ocelli absent; chaetigers 1-3 biannulated, quadriannulated from chaetiger 4-16, then triannulated posteriorly................................................. P. palmeri Blake, 2015; East Antarctic Peninsula.
- Trapezoidal prostomium; ocelli present; chaetiger 1 biannulated, chaetigers quadriannulated from chaetiger 2 onwards..................................................................... P. magalhaesi sp. nov. South Atlantic
description: Published as part of Mendes, Samuel Lucas Da Silva Delgado, Paiva, Paulo Cesar De & Rizzo, Alexandra E., 2024, New species of Pseudoscalibregma Ashworth, 1901 (Annelida: Scalibregmatidae Malmgren, 1867) from Brazil, pp. 19-36 in Zootaxa 5399 (1) on pages 32-33, DOI: 10.11646/zootaxa.5399.1.2, http://zenodo.org/record/10494421