New species of Scalibregmatidae (Annelida) from slope and abyssal depths off eastern Australia

Scalibregmatidae Malmgren, 1867 is a relatively small family of annelids, with only two taxa reported to Brazil. In this work, we expand the scientific knowledge of this group by presenting two new Scalibregma Rathke, 1843 species. The new species S. lanai sp. nov. and S. cinthyae sp. nov. were collected during an expedition to the Campos and Santos oceanographic basins. Scalibregma cinthyae sp. nov. is unique among its congeners by the presence of two rows of paired lobes on the mouth’s upper and lower lips, whereas S. lanai sp. nov. is unique among its congeners by the presence of two rows of paired lobes on the mouth’s lower lip, branchiae from chaetigers 3–5, and lyrate chaetae with equal tynes. We provide an identification key to all Scalibregma species.

Unravelling the diversity of Scalibregma Rathke, 1843 (Annelida: ‘Polychaeta’: Scalibregmatidae) from southeast Brazilian coast

MENDES,

RIZZO,

PAIVA

2023

New species of Pseudoscalibregma Ashworth, 1901 (Annelida: Scalibregmatidae Malmgren, 1867) from Brazil

MENDES,

PAIVA,

RIZZO

2024

Pseudoscalibregma Ashworth, 1901 is a small genus of the family Scalibregmatidae Malmgren, 1867. Currently, a total of eight valid species are accepted. Of these, the majority are found at great depths. This work contains the first report of Pseudoscalibregma to the Brazilian coast, with the description of three new species: Pseuscalibregma ermindae sp. nov., P. magalhaesi sp. nov. and P. parapari sp. nov. The material was sampled from the Brazilian southeast region, on Campos and Santos sedimentary basins, during scientific expeditions called “Santos Project—Santos Basin Environmental Characterization” and “Ambes Project—Espírito Santo Basin Assessment Project”, both coordinated by PETROBRAS/CENPES. We also include an identification key to Pseudoscalibregma species.

First record of Oligobregma Kudenov & Blake, 1975 (Annelida: Polychaeta: Scalibregmatidae Malmgren, 1867) from Brazil with the description of three new species

MENDES,

PAIVA,

RIZZO

2024

Oligobregma represents the most speciose genus of Scalibregmatidae with 17 valid species. Most of them occur at great depths and are found living on soft bottoms. Here, we present the descriptions of O. nonatoi sp. nov., O. cruzae sp. nov., and O. bakkeni sp. nov., sampled from the Brazilian continental shelf and slope, and a key to all species of Oligobregma. O. nonatoi sp. nov. differs from its congeners by the presence of a triangular prostomium with short rounded horns, acicular spines on notopodia of chaetigers 1–4 and on neuropodia of chaetigers 1–3. Oligobregma cruzae sp. nov. can be distinguished by the presence of a quadrangular prostomium with two short, rounded horns, acicular spines on chaetigers 1–4, and lyrate chaetae from chaetiger 5. Finally, O. bakkeni sp. nov. is unique among its congeners by the presence of acicular spines with rounded tips. This is the first record of this genus along the Brazilian coast and the specimens were collected on Espírito Santo, Campos and Santos sedimentary basins, both located in Brazilian southeast region. The sampling campaigns were carried out in scientific expeditions related to two research projects: “Santos Project – Santos Basin Environmental Characterization” and “Ambes Project – Espírito Santo Basin Assessment Project”, both coordinated by CENPES/PETROBRAS.