Three new species of Nautilus Linnaeus, 1758 (Mollusca, Cephalopoda) from the Coral Sea and South Pacific Author Barord, Gregory J. https://orcid.org/0000-0002-4482-8016 Department of Marine Science, Central Campus, Des Moines, Iowa, USA gjbarord@gmail.com Author Combosch, David J. Marine Laboratory, University of Guam, Mangilao, Guam, USA & Museum of Comparative Zoology & Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA Author Giribet, Gonzalo https://orcid.org/0000-0002-5467-8429 Museum of Comparative Zoology & Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA Author Landman, Neil https://orcid.org/0000-0003-0038-8079 Division of Paleontology, American Museum of Natural History, New York, NY, USA Author Lemer, Sarah Marine Laboratory, University of Guam, Mangilao, Guam, USA & Museum of Comparative Zoology & Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA Author Veloso, Job Biology Department, University of Washington, Seattle, WA, USA Author Ward, Peter D. Biology Department, University of Washington, Seattle, WA, USA text ZooKeys 2023 2023-01-25 1143 51 69 http://dx.doi.org/10.3897/zookeys.1143.84427 journal article http://dx.doi.org/10.3897/zookeys.1143.84427 1313-2970-1143-51 A98491CAFA8F45E1BBD433C6628693A8 A64DE90CD4495F72837F67059A1AC528 Nautilus vitiensis sp. nov. Fig. 4 Type material. Holotype : accessioned at University of South Pacific Marine Station (USPMS) #12232 (Fig. 4 ). Collected from Suva Harbour, Fiji, 18°07'10.2"S , 178°24'45.0"E , at depths between 250 and 300 m on 30 Jul. 2018. Figure 4. Lateral view of Nautilus vitiensis sp. nov., holotype USPMS #12232. Diagnosis. The following characteristics distinguish Nautilus vitiensis sp. nov. from other species within the genus Nautilus : 15-30% pigment coloration on shell, more than in N. pompilius and less than in the other species described here; two color pattern morphs present, with both full (stripes from venter to umbilicus) and "umbilical white patch" variety, where stripes flowing down from venter stop short of umbilical region; shell color patterns composed of simple stripes beginning at venter and then extending down the side of shell; these are large and unbranched and are among the simplest of all nautilus shell coloration patterns. The largest specimens of the new species are smaller than the smallest mature N. pompilius , and this species is in general smaller than the other two new species described here, but there is certain overlap. Description. Nautiliconic, shell with umbilical plug, whorl higher than broad at maturity. Periostracum entirely absent in mature and near mature specimens; shell surface ornamented with growth lines parallel to apertural shape; no cross-hatching or ornament perpendicular to growth lines; low rugae. Hood morphology consists of low, elliptical white protuberances barely projecting above hood surface on either side of two long, raised, parallel white stripes running centrally down hood from shell whorl to aperture. White protuberances found between stripes on the entire central section (see hood details on Suppl. material 1: video 1; Fig. 7 ). Mean diameter of adult shell 149.3 mm, s.d. 7.548 (see range of measured specimens in Table 1 ). Table 1. Descriptive statistics of mature shell diameters measured of each of the three new species described as well as N. pompilius from the type locality at Ambon, Indonesia.

-	N. pompilius	N. vitiensis sp. nov.	N. samoaensis sp. nov.	N. vanuatuensis sp. nov.
N	28	35	10	18
Minimum (mm)	187	137	162	150
Maximum (mm)	207	165	177	163
Range (mm)	20	28	15	13
Mean	195.6	149.3	181.2	156.6
Std. deviation	5.144	7.548	5.029	5.237
Std. error	0.9721	1.276	1.590	1.234

Etymology. The specific epithet, an adjective, refers to the type locality, the island of Viti Levu, Fiji, where the type specimen plus additional released specimens sampled for genetic work were collected. Habitat and distribution. Nautilus vitiensis sp. nov. inhabits areas along the coast of Viti Levu, Fiji at Suva Harbour and Pacific Harbour. Specimens were collected and filmed (Suppl. material 1: video 1) at depths between 200-400 m ( Tajika et al. 2022 ).