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Issue: Vol. 5507 No. 2: 12 Sept. 2024
Type: Article
Published: 2024-09-12
DOI: 10.11646/zootaxa.5507.2.2
Page range: 224-244
Abstract views: 77
PDF downloaded: 30

Description of new species of deep water Sthenolepis Willey, 1905 and Neoleanira Pettibone, 1970 (Annelida, Sigalionidae) from off Northern California, with the redescription of Sthenolepis spargens Fauchald, 1972

Departamento de Sistemática y Ecología Acuática; El Colegio de la Frontera Sur; Chetumal; Quintana Roo; Mexico
Aquatic Research & Consulting; 24 Hitty Tom Road; Duxbury; MA 02332; United States of America; Department of Invertebrate Zoology; Museum of Comparative Zoology; Harvard University; 26 Oxford Street; Cambridge; MA 02138 United States of America
Annelida Eastern Pacific deep-sea morphology scale worms

Abstract

Two new species of scale worms belonging to Sigalionidae are described from deep water off Northern California. Specimens were collected as part of long-term monitoring surveys at the San Francisco Deep-Ocean Dredged Material Disposal Site, and baseline studies by the U. S. Navy off Northern California. Specimens were dredged from the continental slope at depths of 2,350 to 3,221 m. Sthenolepis ruffi n. sp. is characterized by having long palps and tentacular cirri, upper neurochaetae group with long blades, and the lowest neurochaetae group with non-canaliculate blades. Due to the morphological and distribution similarities, Sthenolepis spargens from Mazatlán, México is redescribed and compared with the newly described S. ruffi n. sp. Further, Neoleanira solitaria n. sp. stands out among the members of the genus by having a simple fusiform supracicular neurochaeta in posterior segments. Comparative tables of both genera are included. Both new species represent new additions to the knowledge of these genera, more than 50 years after the last description.

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