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Zootaxa

Publisher:
—
ISSN:
1175-5326
Category:
ZOOLOGY
Impact factor:
0.8
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<strong>Bryozoa collected by the R.V. <em>Falkor</em> (<em>too</em>) during the 2025 cruise to the Mar del Plata Submarine Canyon, Southwest Atlantic</strong>

2026-04-01

JUAN LÓPEZ-GAPPA, DIEGO URTEAGA

Fourteen bryozoan species were collected during the 2025 cruise of R.V. Falkor ( too ) to the Mar del Plata Submarine Canyon (37.883333° S, 53.933333° W), at depths ranging between 1018 and 2628 m. Six species are considered new to science: Buffonella plana sp. nov. , B . profunda sp. nov. , Fenestrulina crassa sp. nov. , Smittina amatista sp. nov. , Parasmittina symmetrica sp. nov. and Orthoporidra claviformis sp. nov. For comparison, Patagonian shelf material of Buffonella simplex , a poorly known species described in the 19 th century, is illustrated for the first time with scanning electron microscopy. The known geographic distributions of Microporella gappai and Smittoidea granulosa are expanded northwards. The bryozoan assemblage analysed in the present study has no species in common with the Magellanic bryozoan fauna inhabiting coastal and shelf areas of the Southwest Atlantic. On the contrary, the known distribution of most of these species is, so far, restricted to the continental slope off the Atlantic coast of southern South America. The bryozoan diversity of this Southwest Atlantic canyon is probably much higher than the assemblage documented in the present study.

<strong>Complementary description of <em>Oithona</em> (<em>Paroithona</em>) <em>parvula</em> (Farran, 1908), (Cyclopoida, Oithonidae) and its distribution in the Adriatic Sea, Mediterranean</strong>

2026-04-01

FRANO KRŠINIĆ

The female of the cyclopoid copepod Oithona ( Paroithona ) parvula (Farran, 1908) is complementary described, and the male is described for the first time from samples collected in the Adriatic Sea. The Adriatic specimens differ from the original description in several morphological characteristics, such as; number of antennule segments and setae, number of setae on second antennary segment, the maxillule endopodite, in the maxilla, the first maxilliped segment, leg 5 and the numbers of spines on the exopodal segment of leg 4. A key to identify males and females of Adriatic species of Oithona is herein provided. As a glacial relic, the species O. parvula is permanently present in the northern Adriatic depression, and in the Jabuka Pit from a depth of 50 m to the bottom, with the presence of North Adriatic Dense Water. This water mass is an important habitat for O. parvula and plays a key role in its transport and distribution along the western Adriatic and southern Adriatic Pit.