Simulamerelina tuamotu, Amati & Giulio & Oliverio, 2023
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publication ID |
https://doi.org/ 10.5252/zoosystema2023v45a25 |
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publication LSID |
lsid:zoobank.org:pub:054D312B-C54B-459D-8A47-AC9CB681D7D4 |
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DOI |
https://doi.org/10.5281/zenodo.10455643 |
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persistent identifier |
https://treatment.plazi.org/id/9CFA60AC-901A-421E-92D2-428F9B62CE43 |
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taxon LSID |
lsid:zoobank.org:act:9CFA60AC-901A-421E-92D2-428F9B62CE43 |
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treatment provided by |
Plazi |
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scientific name |
Simulamerelina tuamotu |
| status |
sp. nov. |
Simulamerelina tuamotu n. sp.
( Figs 44 View FIG ; 45 View FIG ; 52C View FIG ; 53T View FIG ; Tables 7 View TABLE ; 8 View TABLE ; 9 View TABLE )
urn:lsid:zoobank.org:act:9CFA60AC-901A-421E-92D2-428F9B62CE43
Simulamerelina sp. 5 – Boutet et al. 2020: 240.
TYPE MATERIAL. — Holotype. Tuamotu • dd (height 1.57 mm, width 0.90 mm, Figs 44 View FIG A-C; 45; 53T); Makemo , Passe Arikitamiro , Nake ; 16°37’1”S, 143°33’43”W; <1 m; reef flat; MNHN-IM-2000-38730 . GoogleMaps
Paratypes. Tuamotu • 10 dd ( Fig. 44D, E View FIG ); same locality data as holotype; MNHN-IM-2000-38731 GoogleMaps .
TYPE LOCALITY. — Tuamotu: Makemo, Passe Arikitamiro, Nake; 16°37’1”S, 143°33’43”W; <1 m.
OTHER MATERIAL EXAMINED. — Tuamotu • 9 dd; Makemo, Passe Arikitamiro; 16°37’15”S, 143°33’50”W; 45-54 m; coll. JL (8), coll. MB (1). GoogleMaps
DISTRIBUTION AND SYMPATRY. — Simulamerelina tuamotu n. sp. is known only for the Tuamotu (Makemo) ( Fig. 52C View FIG ).
No congener collected sympatrically.
ETYMOLOGY. — From the type locality, Tuamotu, used as a noun in apposition.
DIAGNOSIS. — Simulamerelina with shell small for the genus (<2 mm), slender,turriculated, robust.Protoconch paucispiral with markedly twisted nucleus; outline turriculate-pagodiform, with deep canaliculated suture; axials and spirals forming at their intersection, spiny tubercles. Central cordlet larger and protruding. Axial ribs not reaching the base. Start of 3 spiral cordlets, the subsutural weaker, after protoconch-teleoconch boundary. Entire surface covered by distributed spiral threads, more spaced in the interspaces of spiral cordlets. Colouration uniform white.
DESCRIPTION OF HOLOTYPE
Shell ( Figs 44 View FIG A-C; 45A; 53T)
Small for the genus, height 1.57 mm, width 0.90 mm height/ width ratio 1.74, turriculate-pagodiform, elongate ovate.
Protoconch ( Fig. 45B View FIG )
Paucispiral with slightly twisted nucleus, of 1.25 convex whorls, height 0.300 mm, nucleus diameter 0.070 mm, first half whorl diameter 0.167 mm, maximum diameter 0.275 mm. Sculpture of one strong adapical spiral keel, and minute granules over the entire surface. Protoconch-teleoconch boundary well marked.
Teleoconch
Of 3.25 convex whorls, suture canaliculated. Axial sculpture on the last whorl of 10 orthocline ribs, thinner than the interspaces and sharply interrupted at the base. Spiral cordlets of same thickness as axials: 2 on the first whorl, three on the next whorls and 3 above the aperture, 8 on the last whorl; cord I weaker, cord II larger and more protruding; 5 basal cords thinner and more closely spaced. Spiny tubercles at intersections; interspaces quadrangular.
Microsculpture ( Fig. 45C View FIG ) of dense spiral threads, more spaced in the interspaces of the spirals. Umbilical fissure absent. Aperture oval, height 0.53 mm, height/aperture height ratio 2.96, peristome duplicated, internally smooth, externally thickened by a strong prosocline varix.
Colour
Colouration uniform white.
Operculum and soft parts
Unknown.
VARIABILITY
Height ranging 1.25-1.65 mm. Outer lip orthocline, slightly prosocline or slightly opisthocline (seeTable 8 and Appendix 21).
REMARKS
Simulamerelina wanawana ( Kay, 1979) View in CoL , from Barbers Point, Oahu, Hawaii ( Kay 1979: 82, pl. 28, fig. A, B) differs from S. tuamotu n. sp. in its larger size (height 1.75 in the holotype vs height 1.25-1.65 mm in S. tuamotu n. sp.) and the higher height/width ratio (2.33 vs 1.56-1.77 in S. tuamotu n. sp.); in the spiral sculpture of two cords of equal thickness above the aperture vs three cords, of which the subsutural weaker and the median (II) larger and more protruding; the protoconch of 1.5 whorls vs 1.2-1.25 whorls in S. tuamotu n. sp.
Simulamerelina longinqua ( Rehder, 1980) View in CoL , from Easter Island ( Rehder 1980: 29, pl. 5, fig. 10), differs from S. tuamotu n. sp. in its larger size (height 1.8-2.01 mm vs 1.25-1.65 mm in S. tuamotu ); the colouration yellowish white vs uniform white in S. tuamotu n. sp.; the protoconch with two or three spiral cords vs one strong adapical spiral keel, and minute granules over the entire surface in S. tuamotu n. sp.; the fewer spiral cordlets on the base (3 vs 4-5 in S. tuamotu ); the spiral cordlets above aperture all of the same thickness vs three cords, of which the subsutural weaker and the median (II) larger and more protruding in S. tuamotu n. sp.
Merelina lacunosa ( Powell, 1940) View in CoL from Tom Bowling Bay, northern New Zealand ( Powell 1940: 227, pl. 30, fig. 9), recalls S. tuamotu n. sp., in its teleoconch sculpture initially consisting, in both species, of two spiral cordlets of which the central more protruding and the lower, suprasubsutural progressively weaker; it can however be easily distinguished by the apical sculpture typical of the genus Merelina Iredale, 1915 View in CoL , with spiral cordlets vs with one strong spiral adapical keel, and minute granules over the entire surface in S. tuamotu n. sp.; the larger size (height> 2 mm vs height <2 mm in S. tuamotu n. sp.) and higher height/width ratio (2.10 vs 1.56- 1.77 S . tuamotu n. sp.); and for the different colouration (uniform brown vs uniform white in S. tuamotu n. sp.).
See under Simulamerelina micrometrica n. sp. for detailed comparisons.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Simulamerelina tuamotu
| Amati, Bruno, Giulio, Andrea Di & Oliverio, Marco 2023 |
Simulamerelina sp. 5
| BOUTET M. & GOURGUET R. & LETOURNEUX J. 2020: 240 |