Polyophthalmus Quatrefages, 1850

Parapar, Julio, Al-Kandari, Manal, Candás, María & Moreira, Juan, 2021, A new species of Polyophthalmus (Annelida, Opheliidae) from the Arabian Gulf with an insight on internal anatomy and diversity of the genus, Zootaxa 5052 (4), pp. 501-528 : 503-504

Genus Polyophthalmus Quatrefages, 1850

Type species. Polyophthalmus pictus ( Dujardin, 1839)

Diagnosis. [modified from Magalhães et al. (2019)] Body elongated, not divided into distinct regions; ventral groove and two lateral grooves present. Segments indistinctly annulated. Prostomium broadly rounded; low palpode-like papilla absent/present (see Remarks); subdermal eyespots; a pair of large, eversible nuchal organs divided into a ventral and a dorsal region. Branchiae entirely absent. Segmental lateral eyes present between parapodia. Parapodial lobes reduced, notopodial and neuropodial capillaries emerging from body wall. Interramal ciliated sensory papilla and a dorsal and ventral cirrus maybe present in parapodia. Noto- and neuropodial lappets absent. Pygidium with short anal funnel bearing marginal papillae and sometimes a pair of basal papillae.

Remarks. The following modifications to diagnosis provided by Magalhães et al. (2019) were made: 1) a prostomial palpode-like papilla may be present (not ascertained yet in the other species of the genus), 2) presence of a parapodial dorsal cirrus, and 3) a pair of pygidial basal papillae is not always present.