Integrative taxonomy of Gymnobela and Pontiothauma (Conoidea: Raphitomidae) from Australian waters provides more evidence of transoceanic distribution in deep-sea gastropods Author Criscione, Francesco Author Hallan, Anders text Journal of Natural History 2024 2024-08-29 58 37 - 40 1429 1459 http://dx.doi.org/10.1080/00222933.2024.2383786 journal article 303337 10.1080/00222933.2024.2383786 3a1c0bd8-e182-4f3b-8a74-c15e58037ff0 1464-5262 13758516 6C859E86-240D-4DB2-BD64-1F22AD48AF0C Gymnobela agassizi (Verrill and Smith , 1880) (PSH G1) ( Figures 3 A-B, 6A) Pleurotoma ( Pleurotomella ) agassizi Verrill and Smith , 1880 – Verrill 1880: 394; Verrilll 1882: 454, pl. 57, Fig. 3–3a Pleurotoma ( Pleurotomella ) brychia Watson, 1881 – Watson 1881: 451 ; 1886: 335 , pl. 19, fig. 4 Pleurotomella vitrea Verrill, 1885 – Verrill 1885: 414 , pl. 44, fig. 6 Pleurotomella agassizi var. permagna Dall, 1890 – Dall 1890: 308 Material examined Australia , New South Wales , Jervis CMR (− 35.333°S , 151.258°E ), IN2017_ V03 _056, 2650– 2636 m , AMS C .519355. Distribution North Atlantic and Jervis CMR off the coast of NSW. Remarks This species was previously known from its shell only and some minor details of the external anatomy of the animal ( Bouchet and Warén 1980 , p. 50). We provide below some further anatomical details. Animal white. Penis large, coiling clockwise, cylindrical to slightly tapering distally. Cephalic tentacles short, somewhat cylindrical, tip blunt; eyes minute. Venom apparatus: proboscis extremely long, coiled; venom gland convoluted, long; muscular bulb elongated, pearlescent. Radula of hypodermic teeth, relatively straight, tightly rolled; approximately 150 µm in length; barbs absent; adapical opening long; ventral side forming blade approximately 1/6 of length of tooth; base wide, angular, with lateral process; texture rugose; basal opening large, subcircular. Ligament long, rather broad. Apart from its slightly more rounded whorl profile and its weaker ribs, the shell of this species is very similar to that of G. engonia and G. verecunda – from which, however, it can be easily distinguished by its dark orange-stained columella.