Frenulina sanguinolenta

Frenulina sanguinolenta (Gmelin, 1791) (Fig. 4A) 2014 Frenulina sanguinolenta (Gmelin) —Bitner, pp. 250, 252–253, fig. 8A–E (cum syn.). 2015 Frenulina sanguinolenta (Gmelin) —Bitner, p. 41, fig. 4F–G. 2016 Frenulina sanguinolenta (Gmelin) —Bitner & Logan, p. 24, fig. 13A. 2016 Frenulina sanguinolenta (Gmelin) —Álvarez, pp. 63–65, pls. 25K–BB, 26A–O (cum syn.). 2018 Frenulina sanguinolenta (Gmelin) —Bitner & Romanin, pp. 558–559, fig. 6O, P. 2019 Frenulina sanguinolenta (Gmelin) —Bitner, pp. 594–595, fig. 5A, B. Material examined. NW Australia, Kimberley, 13°56’S, 125°38’E, September 2017, coll. C.W. Bryce, H. Morrision—one complete specimen (WAM Z99088); Kimberley, Adele Island, stn 06/K09, 15°26’40.56”S, 123°10’14.877”E, 15 October 2009 —one complete specimen (WAM Z99092). Depth range. 12 m. Measurements. Length 8.1 mm, width 8.2 mm, thickness 4.5 mm. Remarks. Frenulina sangiunolenta is very rare in the material examined but has been already reported from NW Australia (Richardson 1973b; Bryce & Sampey 2017). Its smooth surface with red dashes makes this species easily distinguishable. The shell is of small size, biconvex, slightly unisulcate with a large, circular foramen. It is one of the most widespread species. It is recorded in the Western Indian Ocean (Bitner & Logan 2016), while in the Western Pacific it is known from Japan, Australia and New Caledonia to Fiji, Tonga, French Polynesia and Hawaii (Thomson 1918; Hatai 1940; Richardson 1973 a, 1973b; Emig 1987; Laurin 1997; Bitner 2006 a, 2006b, 2008, 2009, 2010, 2014, 2015; Simon & Hoffmann 2013; Álvarez 2016; Simon et al. 2016, 2018; Bitner & Romanin 2018).