New species of Monticellina and Chaetozone (Polychaeta: Cirratulidae) in the SW Atlantic, and a Review of Monticellina species.

ELIAS R; ORENSANZ, J,M.; RIVERO, M.S.

JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM

CAMBRIDGE UNIV PRESS

Lugar: Cambridge; Año: 2016

0025-3154

During quantitative surveys two new species of Cirratulidae from subtidal bottoms of the Atlantic coast of Argentina werecollected. They belong to the genera Monticellina and Chaetozone. Monticellina morae sp. nov. is characterized by the presenceof a long peristomium of smooth appearance, but triannulated at SEM, bearing the dorsal tentacles in the posterior part,with the first pair of branchiae posterolateral to the dorsal tentacles in chaetiger 1. The body is divided into three parts, ananterior region laterally expanded and with crowded segments, a middle region with beadlike chaetigers and an inflated andcrowded posterior region. Chaetozone larae sp. nov. is characterized by an inflated dorsally and laterally expanded anteriorcrowded region. Peristomium biannulated laterally, with a dorsal crest on the first and second annuli that occupy the entirewidth, and then a narrow crest in the following annulus (interpreted as an achaetous segment). Capillaries are lanceolate,short and long, with acicular spines curved, forming partial cinctures. In addition, a comparative table of all describedspecies of Monticellina is included and the distinctive characters are discussed.