Nuculana anakena Raines &amp; Huber 2012, sp. nov.
Creators: name: Raines, Bret
name: Huber, Markus
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Bivalvia
Nuculanida
Nuculanidae
Nuculana
Nuculana anakena

description: <i>Nuculana</i> (s.l.) <i>anakena</i> sp. nov. Figures 3 A–E <b>Type Material.</b> Holotype: LACM 3148, 1 articulated specimen, 2.2 mm. Paratypes 1–3: LACM 3149, 3 single valves, 2.3–3.9 mm. <b>Type Locality.</b> Along the base of cliffs in sand and rubble at 20 m off Punta Rosalia, east side of Anakena, Easter Island, 27 o 04’18” S, 109 o 19’45” W. <b>Description.</b> A small, semi-translucent white <i>Nuculana</i> species, with raised subcentral umbones. Shell small (up to 4 mm in length), not very fragile, subtriangular, only slightly inflated, equivalve. Umbones raised, nearly centrally located. Prodissoconch, P1 round, smooth, boundary often weakly defined, ca. 247 µm length by 186 µm height, P2 not present. Anterior and posterior margins of adult valves subequal, with posterior margin shorter. Exterior surface smooth with commarginal growth lines, increasing in strength towards ventral margin. No posterior sulcus. Interior non-nacreous, lacks deep pallial sinus. Hinge line highly arched, consisting of split dentition with central resilifer; anterior with 7–9 teeth, posterior with 4–6 teeth. Color white. <b>Comparative diagnosis.</b> A non-nacreous interior together with the shape excludes the genus <i>Ennucula</i> (= <i>Leionucula</i> auctt.). The shape, lack of a deep pallial sinus, and solid structure excludes the genera <i>Yoldiella</i> Verrill &amp; Bush, 1897, and <i>Scissileda</i> Kilburn, 1994. The presence of a resilifer rules out all malletiids including <i>Neilonella</i> Dall, 1881. The lack of a sulcus combined with a rather shallow depth rules out the genus <i>Ledella</i> Verrill &amp; Bush, 1897. The lack of a very thin hinge with few weak teeth and distinct shape exclude all Sareptidae Stoliczka, 1870. <b>Remarks.</b> Although the shape and weak commarginal sculpture do not match typical <i>Jupiteria</i> very well, the closest species appears to be <i>Nuculana</i> (<i>Jupiteria</i>) <i>manawatawhia</i> Powell, 1937, from New Zealand. More and better material is needed to determine, if a new genus is warranted. <b>Distribution.</b> <i>Nuculana</i> (s.l.) <i>anakena</i> is occasionally found at several locations around <i>EI</i>, in sand or rubble, from 10–100 m — <b>E1</b>. <b>Etymology.</b> Named after the type locality.
description: Published as part of <i>Raines, Bret &amp; Huber, Markus, 2012, 3217, pp. 1-106 in Zootaxa 3217</i> on page 10
description: {"references": ["Verrill, A. E. &amp; Bush, K. J. (1897). Revision of the genera of Ledidae and Nuculidae of the Atlantic coast of the United States. American Journal of Science, 4 (3), 51 - 63.", "Kilburn, R. N. (1994) The protobranch genera Jupiteria, Ledella, Yoldiella and Neilo in South Africa, with the description of a new genus. Annals of the Natal Museum, 35, 157 - 175.", "Dall, W. H. (1881) Preliminary report on the Mollusca. In: Reports on the results of dredgings under the supervision of Alexan- der Agassiz, in the Gulf of Mexico, and in the Carribean Sea, 1877 - 79, by the United States Coast Survey Steamer ' Blake', Lieutenant-Commander C. D. Sigsbee, USN, and Commander J. R. Barlett, USN, commanding. Bulletin of the Museum of Comparative Zoology at Harvard College, 9 (2), 33 - 144.", "Stoliczka, F. (1870 - 1871) Cretaceous fauna of southern India, Vol. 3, The Pelecypoda, with a review of all known genera of this class, fossil and Recent. Memoirs of the Geological Survey of India, Palaeontologia Indica 6, 1 - 537.", "Powell, A. W. B. (1937) New species of marine Mollusca from New Zealand. Discovery Reports, 15, 153 - 222."]}