Pseudexogone helmuti Salazar-Vallejo & Bailey-Brock & Dreyer 2007, n. sp.

• Main Authors: Salazar-Vallejo, Sergio I., Bailey-Brock, Julie H., Dreyer, Jennifer C.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Phyllodocida; Pilargidae; Pseudexogone; Pseudexogone helmuti; Indian; Saint-Paul; Saint-Paul Island
• Online Access: https://zenodo.org/record/4893381; https://doi.org/10.5281/zenodo.4893381

Pseudexogone helmuti n. sp. (Fig. 5) TYPE MATERIAL. — Southern Indian Ocean. Off Saint-Paul Island, Marion Dufresne, campagne MD50 JASUS, stn 20-DC 91, 38°47’67”S, 77°27’11”E, 17.VII. 1986, 975 m, very compacted fine sand, holotype (MNHN-1482); paratypes (12 in MNHN, 6 in ECOSUR, including SEM specimen). TYPE LOCALITY. — Off Saint-Paul Island, southern Indian Ocean, in deep water. ETYMOLOGY. — This species is named after Helmut Zibrowius, author of many important publications on serpulid polychaetes, and who participated in several cruises, including the one on which the specimens of this new species were collected. DISTRIBUTION. — Only known from the type locality, off the Saint-Paul Island, southern Indian Ocean, in about 1000 m depth. DESCRIPTION Holotype complete, transparent; body tapering posteriorly, 7.5 mm long, 0.25 mm wide, with 42 chaetigers. Prostomium subtriangular, about as long as wide, slightly narrower than peristomium (corrugated in SEM specimens). Three antennae, all cirriform of about the same size; laterals placed by the prostomial middle, median placed over the posterior prostomial margin. Eyes not visible. Palps tapering, separated distally, in SEM specimens distorted, free from each other (Fig. 5 A-C), each provided with a ventrolateral papilla (Fig. 5B, C), as long as antennae, placed about the half of the palp length. Tentacular cirri cirriform, dorsal cirri slightly longer; ciliary bundles eroded (Fig. 5B). Parapodia uniramous in chaetigers 1-6, thereafter biramous. Parapodial cirri cirriform throughout body. Anterior parapodia with two denticulate capil- laries, one pectinate, and one furcate neurochaetae (Fig. 5D). Notopodia with large sigmoid bidentate spines starting in chaetiger 7, continued to last chaetiger. Neuropodia includes furcates in anterior chaetigers, pectinates and denticulate capillaries, most broken.Furcates with unequal tines, longer tine with a flaring blade not reaching the blunt digitate smaller tine. Median chaetigers (Fig. 5E) with slightly emergent notospines, ...