Aberranta magnumlanai n. sp. (Annelida: Aberrantidae) a new species from Brazil and first occurrence of the genus in the Southern Hemisphere
Keywords:
Deep sea, Brazil, Errantia, Aciculata, incertae sedisAbstract
Aberrantidae is a small group of polychaetes morphologically homogenous and rarely collected. Adult individuals usually have a few millimeters and about 40 chaetigers. Living specimens are transparent, yellowish-brown with a dark alimentary channel and have reddish eyes. The few records of Aberranta, the only described genus in the family, are from mud, sand, sandy-mud, and coarse sand, from four to 3,250 m. All known species have been recorded from the eastern USA, Mediterranean, and China. The examined material is from three projects coordinated by CENPES/Petrobras, the Brazilian oil company. Samples were collected from continental shelf, canyons, and slope depths. Polychaetes and others benthic organisms were sieved from the sediment, fixed in a 4% formalin solution, conserved in 70% alcohol, and then identified. The sampling was carried out from 25 to 3000 m depth, but individuals were collected from 383 to 1312 m. The new species, Aberranta magnunlanai sp. nov., is characterized by the absence of eyes, branchiae from chaetiger 3, and by having three types of neurochaetae: a) thick and smooth capillaries, b) capillary of intermediary length and with long marginal serration, and c) lyriform chaetae with spinose shaft and distal projections of same length. This is the first record of the genus in the southern hemisphere.
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