Horst, 1924 : 187 Pseudonereis rottnestiana Hartmann-Schröder, 1979 : 119 Pseudonereis trimaculata Bakken 2007 : 166 Nereididae (Annelida: Phyllodocida) of the Persian Gulf and Gulf of Oman, including description of two new species and 11 new records Bonyadi-Naeini, Alieh Rastegar-Pouyani, Nasrullah Rastegar-Pouyani, Eskandar Glasby, Christopher J. Rahimian, Hassan Zootaxa 2017 4244 1 91 117 4P4ZB Horst, 1924 Horst 1924 [151,630,906,932] Polychaeta Nereididae Pseudonereis Animalia Phyllodocida 14 105 Annelida species trimaculata     Nereis( Pseudonereis) trimaculata  Horst, 1924: 187–188, pl. XXXVI, figs 8, 9.  Pseudonereis rottnestianaforma costatodentata.  Hartmann-Schröder, 1979: 119, figs 220–222.  Pseudonereis trimaculata.  Bakken 2007: 166, fig. 13.     Materialexamined. Iran, Gulf of Oman: Ramin, six specimens ( ZUTCAnn. 1104), Genaveh Jetty ( ZUTCAnn. 1166), Persian Gulf:  QeshmIsland West coastof Basaidu, ( ZUTCAnn. 1152), Bing Village( ZUTCAnn. 1176),  QeshmIsland-Tola village, eight specimens ( ZUTCAnn. 1190),  QeshmIsland- Kani( ZUTCAnn. 1191),  QeshmIsland- Simin Beach 12 specimens(  ZUTC6145), Djod, one specimen (  ZUTC6163), Djod, five specimens (  ZUTC6144), Abu Musa Island-Beach Park, six specimens (  ZUTC6146), Abu Musa Island-Meteorology station, four specimens (  ZUTC6147).   Description.Material examined 20–54 mmlong, 1.7–4.5mmwide at chaetiger 10 (including parapodia). Color in alcohol light brown, with darker brown pigment on dorsal surface of prostomium and anterior segments. Longest tentacular cirri extending to chaetiger 4–10. Paragnaths on maxillary and oral ring arranged as follows: I = 1 conical paragnath, II =p-bar paragnaths in 3–4 rows arranged in regular comb-like rows, III =p-bars in 3–4 rows arranged in comb-like rows, IV = p-bars and smooth bars (near jaws) in 3–5 rows. V = 1 conical paragnath with sharp tip, VI = 1 large shield-shaped paragnath, VII–VIII = 20–24 large conical paragnaths and two rows of p-bars. In anterior chaetigers, notopodia have two distally rounded ligules equal in length to neuropodial ligules. DC/DNL in anterior parapodia 2.9–6.0. Ventral neuropodial ligules distally rounded in all parapodia. Ventral cirrus similar in length to ventral ligule in anterior parapodia but shorter in posterior ones. Anterior neurochaetae are homogomph spinigers and heterogomph falcigers in dorsal fascicle and heterogomph falcigers in ventral fascicle and homogomph spinigers heterogomph falcigers in dorsal fascicle.   Remarks.Material described in the present study is very similar to the description of  P. trimaculatafrom Gulf of Omanby Yousefi et al. (2011)and material from Eastern Indonesiaand North-west Australiadescribed by Bakken (2007), but differs from both in certain pharyngeal and parapodial features: Bakken’s specimens have 51– 69 paragnaths in Area III while material in the present study has 24–56 paragnaths and those from Gulf of Omanhas 12–45; the number of paragnaths in Area VII–VIII is fewer (20–24) than in specimens studied from Gulf Oman(23–25) and same as the Persian Gulf (20–24) Also, they have only one paragnath in area V like Yousefi et al.’s specimens but they differ from Bakken’s material which has 1–3 paragnaths in Area V. The specimens in this study are smaller than the Omanspecimens and Bakken’s specimens. Bakken (2007)refers to the paragnaths in Area IV near the jaws as cones but those in the present specimens, and those from Gulf of Omancomprise P-bars and smooth parallel bars nearer to the jaws. Lastly, we investigated the correlation between body size (length and width) and paragnath numbers in Area III of specimens collected from the Persian Gulf, and found no correlation between the length/width of the body and the number of paragnaths in Area III (r=-0.107, p=0.628/r=0.233, p=0.284). Thus we conclude that the differences in Area III paragnath number between Bakken’s specimens and specimens from Persian Gulf and Gulf of Omanmay be taxonomically significant, but further character data, including molecular, are required before a new species can be described.   Distribution.Geser, Indonesia( typelocality); North-west Australia( Bakken 2007), Gulf of Oman. 1440674442 ZUTC Iran Material Ramin Gulf of Oman 14 105 1 1440674426 [389,1432,1140,1165] ZUTC Iran Bing Village Basaidu 14 105 1 West coast 1440674433 [151,875,1175,1200] ZUTC Iran Qeshm 14 105 1 1440674425 [888,1344,1175,1200] ZUTC Iran Kani 14 105 1 1440674432 ZUTC Iran Abu Musa Island-Meteorology station Simin Beach 14 105 ZUTC 6145, ZUTC 6163, ZUTC 6144, ZUTC 6146, ZUTC 6147 12