Voluta melodica, Simone, 2024
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publication ID |
https://doi.org/10.11606/1807-0205/2024.64.031 |
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persistent identifier |
https://treatment.plazi.org/id/4008878E-FFD3-A83F-890E-DFF6FF4BFBE1 |
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treatment provided by |
Felipe |
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scientific name |
Voluta melodica |
| status |
sp. nov. |
Voluta melodica View in CoL new species
( Fig. 16 View Figure 16 ) https://zoobank.org/ 83FC8475-C98E-4F50-9EFB-D8FBBE6CA435
Type: Holotype MZSP 135516 View Materials ♀.
Type locality: BRAZIL. Amapá ; off Amazon river mouth, 1.43°N 47.88″W, 46 m [M. Muniz leg., o.t., 01.iii.2017] .
Diagnosis: N Brazilian deepwater species with shape conic; color mosaic of V. ebraea model. Protoconch highly protruded, rather cylindric, of ~3.5 whorls. Spire with plane whorls profile.
Description: Shell about 120 mm, outline rather conic; ~twice longer than wide. Basic color beige, with mosaic of interrupted, not-aligned spiral lines, with narrow spiral areas of absence, and wide spiral irregular areas of coalescence in 2 equidistant areas in last whorl ( Fig. 16B, C View Figure 16 ) ( V. ebraea model). Periostracum dark brown, particularly thick near outer lip and in ventral region of last whorl ( Fig. 16A, B View Figure 16 ), translucent in other areas. Protoconch highly protruded, rather cylindric, of ~3.5 whorls, length ~ 8 mm, maximum width ~ 5 mm ( Fig. 16D, E View Figure 16 ), apex rounded, remaining whorls of similar size; occupying ~6.5% of shell length, ~8% of shell width; transition with teleoconch unclear. Spire ~30% of shell length.Teleoconch of ~5 whorls; 3 first whorls with plane profile, bearing regular axial threads; penultimate whorl with narrow shoulder, sculptured by 10 regular axial undulations bearing small beak in apex of shoulder. Last whorl also with 10 narrow axial undulations bearing small beak in apex of shoulder; beak located preceding superior ¼ of last whorl length. Aperture narrow, ~4-times longer than wide, occupying ~63% of shell length, ~23 of shell width,slightly broader anteriorly than posteriorly. Peristome glossy, pale beige. Outer lip very thick,simple,slightly projected outside,with 7 pairs of equidistant, transverse, dark spots. Inner lip straight, plane callus extending little beyond aperture; inferior ⅔ with 6 well-developed, oblique columellar folds ( Fig. 16A,F View Figure 16 ), penultimate fold as broader, taller fold; superior fold as lowest, double,as inferior end of series of low,weak parallel folds in superior ⅓;folds ending at some distance from callus edge, forming smooth, pointed right peri-siphonal edge. Peristome superior region dorsally arched as weak anal canal ( Fig. 16B View Figure 16 ). Canal short, strongly turned to right ( Fig. 16C View Figure 16 ), ~12% of shell length, ~30% of shell width. No umbilicus.
Head-foot ( Fig. 16G, H View Figure 16 ) of almost 1 whorl; color beige, pigmented by mosaic of irregular, brown lines, like random scribbles in exposed areas, except for foot sole. Head (he) long, flap-like, ~¼ of foot width; pair of flattened cephalic tentacles (te) in each side. Foot (ft) very wide, with marks of shell columellar folds (cm). Operculum (op) small, almost vestigial, elliptical, ~twice longer than wide, rather deformed, nucleus subterminal.
Pallial cavity of ~1-whorl, wide, triangular. Mantle edge (mb) simple, thick, unpigmented. Siphon (si) well-developed, with similar pigment as foot; its base flanked by pair of siphonal flaps (sf). Gill (gi) low and wide. Pallial oviduct (ov) very wide, solid.
Etymology: The specific epithet is derived from the Latin word melodiam, meaning melody, in allusion to the shell and head-foot pigmentation, looking like musical scores.
Distribution: Only known from type locality.
Habitat: Collected in sandy-mud, 46 m, o.t., off Amazon River mouth.
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.