Mitromorpha sama, Simone & Cunha, 2012
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publication ID |
https://doi.org/ 10.5252/z2012n4a6 |
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publication LSID |
lsid:zoobank.org:pub:857CAD31-66E1-4CEE-AB4D-CCD64541D0EF |
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DOI |
https://doi.org/10.5281/zenodo.5173231 |
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persistent identifier |
https://treatment.plazi.org/id/03AA8317-C651-0D4C-FCB0-99A8CE72090F |
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treatment provided by |
Felipe |
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scientific name |
Mitromorpha sama |
| status |
sp. nov. |
Mitromorpha sama View in CoL n. sp.
( Fig. 9 View FIG A-F)
TYPE MATERIAL. — Holotype: Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°00, 37°48’W, 607-620 m depth, MNHN 25224 ( Fig. 9A, B View FIG ) ( MD 55, stn DC 73, Bouchet, Leal & Métivier coll., 27. V.1987). Paratypes: same data as holotype, MNHN 25225, 6 shells, MZSP 102973, 2 shells ( Fig. 9 View FIG C-F). — Off Regência, 19°40’S, 37°48’W, 790-940 m depth, MNHN 25226, 1 shell (stn CB 77).
TYPE LOCALITY. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 19°00, 37°48’W, 607-620 m depth ( MD 55, stn DC 73).
DISTRIBUTION. — Off Espírito Santo, Abrolhos continental slope.
ETYMOLOGY. — The specific epithet is derived from the Tupi-Guarani word “sama”, meaning cord, line; an allusion to the aligned fashion of the axial sculpture.
DIAGNOSIS. — Shell length c. 7 mm, biconic; protoconch paucispiral; sculpture delicate reticulate, with axial cords somewhat aligned along whorls.Aperture elongated; outer lip lyrate within, preceded by slope and axial thread; inner lip with pair of columellar folds.
DESCRIPTION
Shell: length up to 6.6 mm, outline biconic ( Fig. 9 View FIG A-D); width c. ½ length. Colour uniform pale beige. Protoconch whitish, of 1.5 whorls, mammillate ( Fig. 9E View FIG ); comprising c. 5% of length and c. 18% of shell width; surface smooth, glossy; transition with teleoconch clear, orthocline. Spire conic, comprising c. ½ of shell length; spire angle c. 55°. Teleoconch of about five whorls, profile straight, suture plane. Sculptured by series of pustules, aligned both axially and spirally, forming uniform reticulation; c. 20 axial and four spiral lines of pustules in penultimate whorl ( Fig. 9B, D View FIG ); c. 20 spiral lines in initial region of body whorl ( Fig. 9A, C View FIG ); axial lines somewhat continuous with neighbour whorls; subsutural line slightly larger in c. ½ of specimens. Differentiable slope, preceded by axial, low thread, located c. ∕₅ whorl preceding outer lip ( Fig. 9D View FIG ); outer lip thicker on thread, becoming thinner towards edge, with outer surface weakly sculptured. Aperture elliptic, c. ½ of shell length and c. ¼ shell width ( Fig. 9A, D View FIG ); c. 3 times longer than wide; weakly oblique related to longitudinal shell axis. Outer lip internally lyrate, with 4-5 spiral inner, weak cords, being upper cord larger, becoming gradually narrower in peri-siphonal region ( Fig. 9C View FIG ). Inner lip slightly concave, possessing pair of low, middle folds, being uppermost fold slightly larger than inferior fold ( Fig. 9F View FIG ). Siphonal canal short, slightly rostrate, projected forwards and dorsally ( Fig. 9D View FIG ). No broad callus or umbilicus.
MEASUREMENTS (inmm). — Holotype: 6.6 × 3.2; paratype MZSP 102973 View Materials (1): 5.6 × 2.6.
HABITAT. — Sandy-mud bottoms, 607-940 m depth.
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.