Notocalyptogena neozelandica, Amano & Saether & Little & Campbell, 2014

Amano, Kazutaka, Saether, Kristian P., Little, Crispin T. S. & Campbell, Kathleen A., 2014, Fossil vesicomyid bivalves from Miocene hydrocarbon seep sites, North Island, New Zealand, Acta Palaeontologica Polonica 59 (2), pp. 421-428 : 425-426

publication ID	https://doi.org/ 10.4202/app.2012.0070
publication LSID	lsid:zoobank.org:pub:A3DEF67E-16DD-4549-8E90-28E4FCF146A2
persistent identifier	https://treatment.plazi.org/id/E15871C4-A691-4C9B-87B3-75F3BF9BE932
taxon LSID	lsid:zoobank.org:act:E15871C4-A691-4C9B-87B3-75F3BF9BE932
treatment provided by	Felipe
scientific name	Notocalyptogena neozelandica
status	sp. nov.

Treatment

Notocalyptogena neozelandica View in CoL sp. nov.

Figs. 3A–D View Fig , 4A–G View Fig .

Etymology: Named for the country of origin.

Type material: Holotype UOA L4591 View Materials ( Fig. 4D View Fig ) . Paratypes: UOA L4592 View Materials ( Fig. 4G View Fig ) , UOA L4593 View Materials ( Fig. 3D View Fig ) , UOA L4594 View Materials ( Fig. 4F View Fig ) , UOA L4595 View Materials ( Fig. 4C View Fig ) from locality U23/f267, collection AU19983 ; UOA L4596 View Materials ( Fig. 3C View Fig ) from locality U23/f266, collection AU19664 .

Type horizon: Ihungia Limestone , Lower Miocene .

Type locality: Ugly Hill , North Island, New Zealand .

Material.—11 poorly to well preserved specimens from Uglly Hill: U23/f267, AU19983. Among them, the specimens catalogued as UOA L4606 ( Fig. 3A View Fig ), UOA L4605 ( Fig. 3B View Fig ), UOA L4607 ( Fig. 4A View Fig ), UOA L4600 ( Fig. 4E View Fig ) show the internal structure of shell. The specimen as UOA L4603 ( Fig. 4B View Fig ) shows the surface of left valve.

Dimensions.—See Table 3.

Diagnosis.—As for the genus. Description. —Shell medium size (L up to 51.7 mm), rather thick, moderately inflated, elongate-ovate (H/L = 0.43–0.59), equivalve and inequilateral. Antero-dorsal margin broadly curved into narrowly rounded anterior margin; postero-dorsal margin nearly straight, steeply sloping into oblique posterior margin at obtuse angle; posterior end acutely rounded; ventral margin slightly convex. Blunt external ridge running from beak to posterior corner. Internal radial ridge also prominent from beak to just behind posterior adductor muscle scar, making deep groove on internal moulds. Beak prominent, swollen, prosogyrate and located at anterior one-fifth to onethird of shell length (at 20–37% of shell length from anterior margin). Nymph long, occupying about half of shell length. Lunule and lunular incision absent. Ligament strong, occupying about 60% of postero-dorsal length. Shell surface with numerous growth lines. Hinge of right valve with three cardinal teeth; anterior tooth (3a) thin, disposed along antero-dorsal margin; middle tooth (1) strong, oblique anteriorly; posterior tooth (3b) thin, vertical or slightly anteriorly inclined; deeply depressed or flat area behind posterior cardinal tooth. Hinge of left valve with three cardinal teeth; anterior tooth (2a) long and thin, connecting with middle stout tooth (2b); posterior tooth (4b) also rather stout. Pallial line entire.Anterior adductor scar ovate; posterior adductor scar pyriform.

Discussion. —The modern vesicomyid, Calyptogena sp. A by Lewis and Marshall (1996) and Calyptogena sp. by Campbell et al. (2010), collected from the Hikurangi margin, can be distinguished from the new species by having a broad posterior tooth (3b) connecting with anterior tooth (3a), no depressed area behind 3b tooth, and no distinct inner ridge running from beak to postero-ventral corner.

Stratigraphic and geographic range. —Lower Miocene, Ihungia Limestone, Ugly Hill, Wanstead and Haunui; Lower to Middle Miocene, Bexhaven Limestone, Bexhaven, Moonlight North, and Rocky Knob.