Nototriphora decorata (C.B. Adams, 1850)

Fernandes, Maurício Romulo & Pimenta, Alexandre Dias, 2019, Basic anatomy of species of Triphoridae (Gastropoda, Triphoroidea) from Brazil, European Journal of Taxonomy 517, pp. 1-60 : 33-37

publication ID 10.5852/ejt.2019.517

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Nototriphora decorata (C.B. Adams, 1850)


Nototriphora decorata (C.B. Adams, 1850) View in CoL View at ENA

Figs 2H View Fig , 21–23 View Fig View Fig View Fig

Material examined

BRAZIL – Rio de Janeiro State • [1] spec.; Campos Basin ; 22°42´S, 40°40´W; MNRJ 33137 View Materials GoogleMaps [5, 3 d] specs; Ilha do Aleijado , Angra dos Reis; MNRJ 32763 View Materials [2, 1 d] specs; Ilha Cunhambebe Grande, Angra dos Reis ; 22°58´04″ S, 44°24´52″ W; intertidal; 29 Sep. 2008; A. Breves leg.; MNRJ 19785 View Materials GoogleMaps [4, 1 d] specs; Ilha da Gipóia , Angra dos Reis; 2003; MNRJ 28854 View Materials . – São Paulo State • [9, most juvs, 2 d] specs; Ilhabela ; 29 Mar. 2007; P. Longo leg.; in Sargassum sp.; ZUEC-GAS 1803-1811 . – Santa Catarina State • [7, 2 d] specs; Praia da Sepultura, Bombinhas ; 27°08´31″ S, 48°28´40″ W; 20 Dec. 2016; M.R. Fernandes leg.; MNRJ 28941 View Materials GoogleMaps [1] spec.; Praia da Tainha, Bombinhas ; 27°12´59″ S, 48°30´40″ W; 21 Dec. 2016; M.R. Fernandes leg.; MNRJ 28957 View Materials GoogleMaps .

Description of basic anatomy

OPERCULUM. Rounded to slightly elliptical, thick, slightly opaque, yellowish, corneous, multispiral, up to 4.75 distinct whorls, nucleus subcentral, dislocated 21–27% from center toward margin; diameter of operculum exceeds diameter of opercular pouch in ~20%.

JAW. Wing-shaped; outer side with scales boomerang-shaped, rectangular, rhombus-shaped, puzzleshaped or X-shaped; scales of outer side 9.1–9.9 µm long, 3.0–4.0 µm wide, ratio length/width 2.5–3.2 (boomerang-shaped), 10.2–10.9 µm long, 4.3–4.9 µm wide, ratio length/width 2.1–2.5 (rectangular), 14.1–15.7 µm long, 5.5–6.4 µm wide, ratio length/width 2.4–2.6 (rhombus-shaped), 11.3–12.8 µm long,

1.9–2.2 µm wide, ratio length/width 5.6–6.4; scales with micro-pores up to 500 nm in diameter; inner side with smooth lanceolate scales, 12.4–15.9 µm long, 3.9–5.8 µm wide, ratio length/width 2.7–3.8.

RADULA. Formula 18-1-1-1 -18; central tooth claw-like, with three nearly similar cusps, median cusp thinner, outer cusps more prominent and broader in the middle of its length, assuming a somewhat rhombus-shape; lateral teeth comb-like, with five similar cusps, but outer ones (cusps 1 and 5) slightly broader and more prominent, cusp 2 often slightly more reduced; M1 with four cusps, inner ones (cusps 2 and 3) much thinner and elongated (1.5–2.7× longer than cusps 1 and 4), resembling malleable filaments, cusps 1 and 4 curved, somewhat similar to outer cusps of central and lateral teeth; remaining marginal teeth similar to M1, but with three cusps, median one much elongated (1.5–2.5× longer than outer cusps); central tooth 3.1–4.1 µm wide, lateral teeth 3.4–4.7 µm wide, marginal teeth between 1.8 µm (outer teeth) to 3.7 µm wide (M1).


García & Luque (1986) cited the existence of red spots on the flanks, near the operculum, of Caribbean specimens of N. decorata , which was not observed in specimens from Cuba studied by Rolán & Fernández-Garcés (1994) nor herein. Specimens analyzed by García & Luque (1986) could actually be wrongly identified as N. decorata , because a red pigmentation can be seen in other genera, such as Monophorus and Nanaphora .

Although briefly described by Rolán & Fernández-Garcés (1994), the thick and yellowish operculum of N. decorata is herein illustrated for the first time ( Fig. 21 View Fig C–E), superficially resembling those previously described for the genus, despite the operculum of N. decorata having fewer whorls and not being so tall as in the type species N. aupouria ( Marshall 1983) .

The radula herein described is identical to the Caribbean one described by Rolán & Fernández-Garcés (1994).Another similar radula is that of the eastern Atlantic species Nototriphora canarica (Nordsieck & Talavera, 1979) , with 17 marginal teeth ( Bouchet 1997). Both species also share a remarkably similar shell, being considered in the past as a single species (for detailed comparisons, see Bouchet 1985), and they have probably diverged recently.

Bouchet (1997) compared the radula of N. canarica with that of type species N. aupouria ( Marshall 1983) , finding discrete differences such as the latter species with four cusps in lateral teeth (instead of five), four cusps in M2 and M3 (instead of three), and a reduced number of marginal teeth (only nine). Such differences also apply to N. decorata , which has a similar radula to N. canarica . Even with the evident closer relationship of the two Atlantic species, their radula cannot be seen as diverging in a generic level to the type species owing to a very similar tooth morphology, except by the species-level differences listed above.

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