Pycnogonida (Arthropoda) from Uruguayan waters (Southwest Atlantic): annotated checklist and biogeographic considerations

FABRIZIO SCARABINO; ANNA SOLER-MEMBRIVES; GUZMÁN LÓPEZ; RUDÁ AMORIM LUCENA; LEONARDO ORTEGA; JOSÉ MARÍA (LOBO) ORENSANZ; TOMAS MUNILLA; EVANGELINA SCHWINDT; MARTIN LIDSEY CHRISTOFFERSEN

ZOOTAXA

MAGNOLIA PRESS

Lugar: Auckland; Año: 2019 vol. 4550 p. 185 - 200

1175-5326

Records of pycnogonids from Uruguayan waters (south-western Atlantic) include 26 species cited from precise locations,and at least five other species based on unconfirmed records. Nearly half of the species in that fauna belong to the genusNymphon (12 spp.). Most species (22) come from deep-water and were recorded and described by C. A. Child. Of these,at least twelve species have an extended Antarctic and Subantarctic distribution, showing the influence of these cold watersin the area; three others have a wide deep-sea distribution pattern. Five species are known only from the lower slopeand abyssal basin off La plata river: Mimipallene Atlantis and four species of Nymphon. Records from coastal and shelfareas (four species) are poorly documented and should be the focus of future research. Of these, Colossendeis geoffroyi isconsidered endemic in the Southwest Atlantic between 34ºS and 40ºS, but presents clear Antarctic affinities. A small-sizedspecies living in shallow waters, Pycnogonum cessaci, is here considered as cryptogenic.