Nanaphora sp. 1, Laseron, 1958
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publication ID |
https://doi.org/ 10.5852/ejt.2020.665 |
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publication LSID |
lsid:zoobank.org:pub:836C9171-0849-4F4D-BC8D-90C2D9E8B9D1 |
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persistent identifier |
https://treatment.plazi.org/id/03E58799-FFA1-AF6A-FD70-FE36FDADFB16 |
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treatment provided by |
Valdenar |
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scientific name |
Nanaphora sp. 1 |
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Figs 12 View Fig , 23S View Fig , 60 View Fig
Material examined
BRAZIL – Rio Grande do Norte • 1 spec.; 04º41′20″ S, 36º34′45″ W; depth 145 m; 22 May 2011; MNRJ 35177 View Materials GoogleMaps *.
Description
Shell sinistral, inflated, biconical/ovoid, convex profile, 2.9 mm long, 1.2 mm wide, length/width ratio 2.5. Protoconch multispiral, conical/columnar, 0.40 mm long, 0.36 mm wide, four convex whorls; embryonic shell dome-shaped, eroded; larval shell with two spiral cords, situated at ~41% and ~66% of penultimate whorl height, the adapical cord disappears in the last whorl; ~28 nearly rectilinear axial ribs. Teleoconch with 6.5 whorls; two spiral cords (adapical and abapical) at beginning, abapical one continuous to that of protoconch; median spiral cord emerges in fourth whorl, reaching same size of other cords after 1.5 whorl; on body whorl, spiral cords are as wide as distance between them; 24 nearly orthocline axial ribs in sixth whorl; rounded nodules of medium size; distinct suture, with very small sutural cord; wavy subperipheral cord, two nearly smooth basal cords; no supranumerical cords; elliptical aperture, 0.69 mm long, 0.44 mm wide, length/width ratio 1.5; anterior canal curved backwards/ downwards, short, partially open, 0.11 mm long, 0.22 mm wide, length/width ratio 0.5; posterior canal as small sinus, 0.08 mm long. Shell beige, nodules of teleoconch slightly clearer than internodular spaces.
Remarks
The most similar species to Nanaphora sp. 1 is Triphora turtlebayensis Rolán & Lee, 2008 , both sharing a distinct ovoid shell shape. However, T. turtlebayensis has a paucispiral protoconch and is restricted to Bermuda. Nanaphora sp. 1 is also superficially similar to the western Atlantic species Nanaphora verbernei ( Moolenbeek & Faber, 1989) , but mainly distinguished by an earlier emergence of the median spiral cord of the teleoconch ( Fig. 12B View Fig ) and by the smoothness of the subperipheral and basal cords ( Fig. 12D View Fig ). Nanaphora sp. 1 is herein regarded as belonging to this genus especially owing to its shell shape and to the small size of its protoconch, although this species has smaller nodules of the teleoconch when compared to typical species of Nanaphora , and its embryonic shell sculpture remains unknown due to erosion.
Geographical records
Brazil: Rio Grande do Norte.
Bathymetric distribution
Only known from 145 m depth.
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