Benthonellania tuamotu, Amati & Giulio & Oliverio, 2022
publication ID |
https://doi.org/ 10.5252/zoosystema2022v44a12 |
publication LSID |
urn:lsid:zoobank.org:pub:ECBC345E-3870-4935-B430-744969F3DFD4 |
DOI |
https://doi.org/10.5281/zenodo.6798930 |
persistent identifier |
https://treatment.plazi.org/id/49FA642C-D59A-49E5-9B73-0A544D048F6A |
taxon LSID |
lsid:zoobank.org:act:49FA642C-D59A-49E5-9B73-0A544D048F6A |
treatment provided by |
Felipe |
scientific name |
Benthonellania tuamotu |
status |
sp. nov. |
Benthonellania tuamotu View in CoL n. sp.
( Figs 20 View FIG A-K; 22A-D; 25H; 26M; Tables 1 View TABLE ; 2)
urn:lsid:zoobank.org:act:49FA642C-D59A-49E5-9B73-0A544D048F6A
TYPE MATERIAL. — Holotype. Tuamotu • 1 dd (height 4.42 mm, width 2.5 mm, Figs 20 View FIG A-C; 22A-D); Tikehau , TARASOC Stn DW 3388; 14°56’S, 148°14’W; 6.X.2009; 820-835 m depth; MNHN- IM-2000-37697. GoogleMaps
Paratypes • 3 dd; same locality data as holotype • 2 dd; MNHN- IM-2000-37699; Tikehau , Stn DW 3389; 14°55’S, 148°15’W; 6.X.2009; 889 m depth; MNHN-IM-2000-37698 GoogleMaps • 1 dd; Tikehau , Stn DW 3387; 14°57’S, 148°16’W; 6.X.2009; 550-600 m depth; MNHN-IM-2000-37700 GoogleMaps .
TYPE LOCALITY. — Tuamotu, Tikehau, TARASOC Stn DW3388; 14°56’S, 148°14’W; 820-835 m depth.
OTHER MATERIAL EXAMINED. — Tuamotu • 3 dd; SW Kaukura, TARASOC Stn DW3359; 15°57’S, 147°08’W; 1.X.2009; 462-980 m depth; MNHN GoogleMaps • 5 dd, 1 lv; Kaukura, TARASOC Stn DW 3373; 15°41’S, 146°54’W; 4.X.2009; 507-607 m depth; MNHN GoogleMaps • 8 dd; between Tikehau and Rangiroa, TARASOC Stn DW 3349; 15°05’S, 148°03’W; 30.IX.2009; 976-997 m depth; MNHN GoogleMaps .
Society Islands • 1 dd; Maupiti, TARASOC Stn DW 3407; 16°32’S, 152°31’W; 12.X.2009; 445-645 m depth; MNHN GoogleMaps • 1 dd; Raiatea, TARASOC Stn DW 3451; 16°53’S, 151°21’W; 18.X.2009; 440- 490 m depth; MNHN GoogleMaps .
Tarava Seamounts • 1 dd; Mont Punu Taipu, TARASOC Stn DW 3308; 19°16’S, 151°01’W; 23.IX.2009; 592-632 m depth; MNHN GoogleMaps • 1 dd; Mont ‘ Otaha, TARASOC Stn DW 3327; 18°45’S, 152°16’W; 26.IX.2009; 747-836 m depth; MNHN GoogleMaps • 2 dd; Mont ‘ Otaha, TARASOC Stn DW 3333; 18°45’S, 152°18’W; 26.IX.2009; 795-975 m depth; MNHN GoogleMaps .
Australes • 1 dd; Rimatara, BENTHAUS Stn DW 2021; 22°37’S, 152°49W; 25.XI.2002; 1200-1226 m depth; MNHN GoogleMaps • 2 dd; Rimatara, BENTHAUS Stn DW 2020; 22°37’S, 152°49’W; 25.XI.2002; 920- 930 m depth; MNHN GoogleMaps • 3 dd; South coast of Rurutu, BENTHAUS Stn DW 2010; 22°32’S, 151°21’W; 25.XI.2002; 520-950 m depth; MNHN GoogleMaps • 1 dd; Récif Neilson, BENTHAUS Stn DW 1925; 27°00’S, 146°05’W; 12.XI.2002; 560-790 m depth; MNHN GoogleMaps .
DISTRIBUTION AND SYMPATRY. — The species is at present known from the South Pacific Ocean, at Tarava Seamounts (Mont ‘Otaha, Mont Punu Taipu), Society Islands (Maupiti, Raiatea), Tuamotu (SW Kaukura, between Tikehau and Rangiroa, Tikehau, Kaukura) and Australes (Rimatara, South coast of Rurutu, Récif Neilson), with empty shells collected in 440-997 m depth, and a single live collected specimen, from Tuamotu, Kaukura,TARASOC Stn DW3373 507-607 m 15°41’S, 146°54’W ( Fig. 25H View FIG ).
Benthonellania tuamotu n. sp. is sympatric with Benthonella boucheti n. sp. at the Tarava Seamounts (Mont ‘Otaha), Australes (Rimatara, South coast of Rurutu, Récif Neilson); with Benthonella basistriata n. sp. at the Tuamotu (Tikehau, Kaukura); with Benthonellania maestratii n. sp. at the Australes (Récif Neilson, South coast of Rurutu); with Benthonella communis n. sp. at the Tarava Seamounts (Mont Punu Taipu), Society Islands (Maupiti, Raiatea), Tuamotu (WS Kaukura, Kaukura between Tikehau and Rangiroa, Tikeha), Australes (Rimatara, South coast of Rurutu, Récif Neilson); with Benthonellania bouteti n. sp. at the Tarava Seamounts (Mont ‘Otaha, Mont Punu Taipu), Tuamotu (SW Kaukura, Kaukura, between Tikehau and Rangiroa, Tikehau), Society Islands (Maupiti, Raiatea), Australes (Rimatara, South coast of Rurutu, Récif Neilson); with Benthonellania tarava n. sp. at the Tarava Seamounts (Mont ‘Otaha), Tuamotu (SW Kaukura, Kaukura, between Tikehau and Rangiroa, Tikehau), Australes (Rimatara, South coast of Rurutu); with Benthonellania alis n. sp. at the Tarava Seamounts (Mont ‘Otaha, Mont Punu Taipu), Australes (Rimatara, South coast of Rurutu) ( Table 2).
ETYMOLOGY. — After the name of the area of the type locality (Tuamotu Islands), used as a noun in apposition.
DESCRIPTION OF HOLOTYPE
Shell ( Figs 20 View FIG ; 22 View FIG A-D)
Large for the genus, height 4.42 mm, width 2.5 mm. height/width ratio 1.77, not very solid, ovate-conical, rather slender, with slightly stepped outline, broad base and large aperture.
Protoconch ( Fig. 22B, D View FIG )
Multispiral, acute of 2.30 whorls, height 0.40 mm, nucleus diameter 0.10 mm, first half whorl diameter 0.187 mm, maximum diameter 0.475 mm; (protoconch I in poor condition) protoconch II with two spiral cordlets with a wavy-zigzag pattern in the upper area, two fine spiral keels in the lower half; in the interspaces oblique microstructures ( Fig. 22B View FIG ). Protoconch-teleoconch boundary marked, prosocline, sinuous.
Teleoconch
Of 4.5 whorls, almost flat adapically, the last ones convex, suture canaliculate, crowned by large tubercles at tips of axial ribs, highlighted by a subsutural spiral groove. Height last whorl 2.9 mm, height/height last whorl ratio 1.524. Axial sculpture of 20 slightly curved, barely acute and prosocline ribs on last whorl, almost orthocline on first whorls, slightly narrower than interspaces, abruptly interrupted before the base. Spiral sculpture of 4 fine cordlets only on the base on last whorl. Microsculpture only growth striae ( Fig. 22C View FIG ). Umbilical chink absent. Aperture pyriform, small, height 1.85 mm, height/height aperture ratio 2.391, peristome continuous, outer lip (broken) internally smooth. Columella arcuate, slightly angular, simple.
Colour
Coloration of teleoconch translucent white, protoconch orange.
Operculum and soft parts
Unknown.
VARIABILITY
Species not very variable (See Table 1 View TABLE and Appendix 12). The only adult specimen (Tuamotu, Kaukura 507-607 m depth) with soft parts and operculum inside the shell, has the intact outer lip without varix.
REMARKS
Benthonellania charope ( Melvill & Standen, 1901) from the Gulf of Oman (c. 374 m depth), and Benthonellania profundior ( Hedley, 1907) n. comb. from 33 miles east of Sydney (c. 1458 m depth), are very similar to each other, and to Benthonella tuamotu n. sp. for their outline with stepped whorls. However, both have paucispiral vs multispiral protoconch in B. tuamotu n. sp., are smaller (height 1.75 mm B. charope and 2.95 mm B. profundior n. comb. mm vs 3.60-4.95 mm in B. tuamotu n. sp.), have lower height/width ratios (1.476 -1.596 in B. charope and 1.478 -1.609 in B. profundior vs 1.625 -1.787 in B. tuamotu n. sp.) and more pronounced spiral sculptures (see Melvill & Standen 1901: 365, pl. XXII, fig. 8; Hedley 1907: 358, pl. LXVII, fig. 15).
See under Benthonellania lozoueti n. sp. for diagnostic comparison.
MNHN |
Museum National d'Histoire Naturelle |
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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SubClass |
Caenogastropoda |
Order |
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SuperFamily |
Rissooidea |
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