Talassia flexisculpta, Hoffman & Freiwald, 2022
publication ID |
https://doi.org/ 10.5852/ejt.2022.819.1785 |
publication LSID |
lsid:zoobank.org:pub:1BED4F4B-ED7A-43CB-ABC5-0173D7F93C41 |
DOI |
https://doi.org/10.5281/zenodo.6564587 |
persistent identifier |
https://treatment.plazi.org/id/E296DB40-9DC8-4EF4-A17B-B49046CAA209 |
taxon LSID |
lsid:zoobank.org:act:E296DB40-9DC8-4EF4-A17B-B49046CAA209 |
treatment provided by |
Felipe |
scientific name |
Talassia flexisculpta |
status |
sp. nov. |
Talassia flexisculpta View in CoL sp. nov.
urn:lsid:zoobank.org:act:E296DB40-9DC8-4EF4-A17B-B49046CAA209
Figs 44–50 View Figs 44–50
Etymology
The specific epithet refers to the flexuous axial sculpture.
Type material
Holotype MAURITANIA – Arguin South 3 Canyon • 1 shell ( Fig. 49 View Figs 44–50 ); 19.7381° N, 17.1465° W; depth 483 m; 7 Nov. 2010; van Veen grab; in silty mud; MSM16/3-GeoB14858 ; SMF358970 About SMF . GoogleMaps
Paratypes MAURITANIA – Arguin South 3 Canyon • 2 shells ( Figs 46–48, 50 View Figs 44–50 ); same collection data as for holotype; SMF358971 About SMF GoogleMaps • 1 shell same collection data as for holotype; SMF358972 About SMF GoogleMaps .
Other material examined
MAURITANIA • 1 shell; Tanôudêrt Canyon ; 20.2429° N, 17.6681° W; depth 490 m; 3 Nov. 2010; box core in coral rubble with silty mud; MSM16/3-GeoB14799 ; SaM79754 GoogleMaps • 1 shell ( Figs 44–45 View Figs 44–50 ); Timiris deep coral mound chain ; 18.9634° N, 16.8688° W; depth 498 m; 11 Nov. 2010; box core in coral rubble with silty mud; MSM16/3-GeoB14877 ; SaM79756 GoogleMaps • 1 shell; Banda Mounds ; 17.6794° N, 16.6684° W; depth 450 m; 8 Jan. 2007; box core in coral rubble with mud; POS346-GeoB11579 ; SaM79753 GoogleMaps • 3 shells; Banda Mounds ; 17.6699° N, 16.6736° W; depth 505 m; 14 Nov. 2010; bottom grab in silty mud; MSM16/3-GeoB14898 ; SaM81473 GoogleMaps .
Description
Elevated shell with rounded whorls, regular axial sculpture of raised flexuous ribs, flexuous lip and smooth protoconch, cream white. Holotype dimensions: height 2.5 mm, width 1.2 mm, apical angle 38°.
PROTOCONCH. Elevated paucispiral shell with globular nucleus and 1¼ whorls ( Figs 45, 47, 50 View Figs 44–50 ); first whorl smooth, last ¼ whorl with weak broad spiral bands; lip straight, slightly thickened ( Fig. 50 View Figs 44–50 ); width 0.44 mm.
TELEOCONCH. Elevated spire with 3 rounded whorls and deep suture ( Figs 44, 46, 49 View Figs 44–50 ). Axial sculpture with regularly spaced flexuous ribs and numerous growth lines. Many regularly-spaced spiral lines composed of closely-aligned raised dots ( Fig. 48 View Figs 44–50 of paratype). Narrow, deep, elongated umbilicus at base body whorl partly covered by parietal lip ( Figs 46, 49 View Figs 44–50 ).
APERTURE. Oval outline, flattened on parietal side; smooth inside ( Figs 44, 46, 49 View Figs 44–50 ). Parietal and columellar lip sharp; external lip not thickened, blunt, flexuous with notches above periphery and at base. Aperture height 1.0 mm in holotype.
VARIABILITY. Sculpture of the teleoconch shows variability in strength of axial ribs. In a subadult shell ( Fig. 44 View Figs 44–50 ), the umbilical slit is nearly closed. Observed range of adult height 2.4–2.5 mm.
Distribution
NE Atlantic Ocean, Mauritania, latitude 17.6– 20.3° N, known depth range 450– 505 m.
Remarks
The radula and the soft parts of the new species are unknown; only empty shells were found in or near coral debris with silty or muddy sand. Talassia flexisculpta sp. nov. was found sympatrically with T. laevapex sp. nov.
Differential diagnosis
Talassia dagueneti has a similar teleoconch sculpture but its whorls are more inflated, its spire is more elevated with a smaller apical angle and its protoconch has a strong spiral sculpture ( Warén & Bouchet 1988; Figs 4–6 View Figs 1–11 ) whereas T. flexisculpta sp. nov. has a more conical outline ( Fig. 48 View Figs 44–50 ) and a largely smooth protoconch ( Figs 45, 47, 50 View Figs 44–50 ). Talassia mexicana sp. nov. also has a similar teleoconch sculpture and a smooth protoconch; however, this species is taller and it has fine spiral cordlets on the teleoconch ( Figs 22, 25, 29–30 View Figs 22–30 ) which are absent in T. flexisculpta sp. nov. A comparison with other known species is given under T. laevapex sp. nov.
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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