Plotohelmis cf. capitata (Greeff, 1876) (Figs 1, 4, 7–8) Rhynchonerella capitata Greeff, 1876: 74, pl.5 Fig. 67–68 [original description, figures of head region and one of the tentacular cirri; Arrecife, Canary Islands] Rhynchonerella fulgens Greeff 1885: 450–453, Pl. XIII Figs, 27–32, Pl. XIV Figs. 33–36 [original description; Gulf of Guinea, tropical Atlantic].— Apstein 1900: 15, Pl. II Figs 19–22, Pl. V Fig. 51 [brief description and comparison with Rhynchonerella capitata Greeff, 1876; tropical and subtropical Atlantic].—Izuka 1914: 8–9, Pl. I Figs 11–12 [description; Pacific Ocean off Japan] — Fauvel 1923: 2010, Fig. 79 a–d [description; Atlantic, Mediterranean off Algiers and between the Balearic Islands and Sardinia] Plotohelmis capitata Støp-Bowitz 1948: 32 [description almost missing; synonymy and discussion of distribution based on Atlantic and Mediterranean records], 1992: 57 [description almost missing, discussion of synonymy; Atlantic ocean off central Africa].— Dales 1957: 126, 128 [comparison of three Plotohelmis species based on records published elsewhere].— Day 1967: 195, Fig. 7.5 J–L [description; southwest Indian Ocean].— Orensanz & Ramírez 1973: 47–49, Pl. IX [description; subtropical north Atlantic].— Hartman 1959: 171 [synonymy].— Fernández-Álamo 1983: 82–86, Fig. 20 [description; Pacific Ocean off Mexico and Central America] Material examined. Seven specimens: ZMMU WS20963, ZMMU WS20964, ZMMU WS20965, ZMMU WS20966 (FA, Et); ZMMU WS20967, ZMMU WS20968, ZMMU WS20969 (FA). Description (based on all our material). Material represented by fragments 2–3 mm long comprised by 13–20 chaetigers; width at 10 th chaetiger 0.4–0.5 mm. Prostomium projects in front of eyes. Frontal antennae tapering, subequal; median antenna hardly discernible, as round papilla (Fig. 7A). Eyes directed sideways and slightly forward. Proboscis short with 12 marginal papillae. Tentacular cirri arranged as; dorsal ones increasing in size caudally with D3 being almost equal to body width without parapodia; ventral cirri minute, V2

Published as part of KOLBASOVA, G. D., SYOMIN, V. L., SEMPERE-VALVERDE, J., TEIXEIRA, M. A. L. & CARVALHO, S., 2025, Holopelagic Annelida from the Red Sea off the Central Saudi Arabian coast, pp. 1-41 in Zootaxa 5632 (1) on pages 14-15, DOI: 10.11646/zootaxa.5632.1.1, http://zenodo.org/record/15371376