Similiphora intermedia (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: 39-43

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Similiphora intermedia (C.B. Adams, 1850)


Similiphora intermedia (C.B. Adams, 1850) 

Figs 2JView Fig, 25–27View FigView FigView Fig

Material examined

BRAZIL – Ceará State • [1] spec.; Praia da Pedra Rachada, Paracuru ; 16 May 2003; L.R. Simone leg.; MZSP 36450  . – Alagoas State • [1] spec.; Praia da Ponta Verde, Maceió ; 09°40´05″ S, 35°41´35″ W; 1 m depth; M.D. Correia leg.; MZSP 102113GoogleMaps  . – Bahia State • [1] spec.; Forte Santa Maria, Salvador ; 13°00´15″ S, 38°32´03″ W, 0–10 m depth; 18 Feb. 2016; M.R. Fernandes leg.; MNRJ 35062View MaterialsGoogleMaps  . – Espírito Santo State • [1] spec.; Ilha Escalvada, Guarapari ; 20°42´00″ S, 40°24´28″ W; 10–15 m depth; 12 Oct. 2014; M.R. Fernandes and L.S. Souza leg.; MNRJ 33983View MaterialsGoogleMaps  . – Rio de Janeiro State • [4, 3 d] specs; Campos Basin; 22°42´ S, 40°40´ W; 12 m depth; 22 Mar. 2004; MNRJ 30854GoogleMaps  [22, 2 d] specs; Campos Basin ; 22°42´ S, 40°40´ W; 2006; MNRJ 18751View MaterialsGoogleMaps  [3] specs; Campos Basin ; 22°42´ S, 40°40´ W, 5–10 m depth; 2007; MNRJ 15402View MaterialsGoogleMaps  [65, 1 d] specs; same data as for preceding; MNRJ 29763View MaterialsGoogleMaps  [1] spec.; same data as for preceding; MNRJ 32962View MaterialsGoogleMaps  [4] specs; same data as for preceding; MNRJ 33136View MaterialsGoogleMaps  [2, 2 d] specs; Prainha, Arraial do Cabo ; 14 Mar. 2015; M.R. Fernandes and L.S. Souza leg.; MNRJ 26840View Materials  [1] spec.; Praia do Forno, Arraial do Cabo ; 14 Mar. 2015; M.R. Fernandes and L.S. Souza leg.; MNRJ 26830View Materials  [2, 2 d] specs; Enseada do Cardeiro, Arraial do Cabo ; 6 m depth; 12 Sep. 2015; M.R. Fernandes and L.S. Souza leg.; MNRJ 34616View Materials  [1] spec.; Ilhas Maricás, Maricá ; 8 m depth; 12 Feb. 2015; M.R. Fernandes and L.S. Souza leg.; MNRJ 34242View Materials  .

Description of basic anatomy

EXTERNAL MORPHOLOGY. Body white, head and anterior/lateral portions of foot mainly black, cephalic tentacles and ventral part of the foot entirely white; pedal slit covering 65–80% of foot length.

OPERCULUM. Ovate, thin, semi-transparent, membranous, multispiral, ~4.25 whorls, nucleus subcentral, dislocated 22–26% from center toward margin.

JAW. Wing-shaped; outer side with scales rectangular/squared, rectangular-bilobed (resembling tiles), bone-shaped or occasionally acute-lanceolate; scales with micro-pores up to 400 nm in diameter; inner side with scales oblong-lanceolate or hexagonal/gem-like, surface smooth; scales of outer side 10.0– 13.2 µm long, 3.4–6.2 µm wide, ratio length/width 2.0–3.0 (rectangular scales), 10.0– 11.5 µm long, 2.7–6.0 µm wide, ratio length/width 1.9–3.8 (rectangular-bilobed), 11.5–12.7 µm long, 3.4–3.8 µm wide, ratio length/width 3.2–3.4 (bone-shaped); scales of inner side usually 12.4–15.3 µm long, 5.4–7.1 µm wide, ratio length/width 2.1–2.6 (oblong-lanceolate scales), 12.5–13.0 µm long, 7.0– 7.4 µm wide, ratio length/width 1.7–1.8 (hexagonal).

RADULA. Formula 14-1-1-1 -14; central and lateral teeth with three cusps similarly sized, with a parrotbeak appearance, outer cusps slightly oriented outwards and slightly broader and more prominent than median cusp; a very small process may appear on the side of cusp 1 of lateral teeth; marginal teeth with three cusps, median one much thinner and elongated (1.6–2.9× longer than outer cusps), resembling a malleable filament, outer cusps curved in inner teeth (somewhat similar to outer cusps of central and lateral teeth, but not oriented outwards as the latter) but more triangular and elongated in outer teeth; median cusp of marginal teeth develops in the lower half of tooth, outer cusps develop in the top of tooth; base of marginal teeth more developed than that of central and lateral teeth; central tooth 3.5–5.7 µm wide, lateral teeth 3.1–5.4 µm wide, inner marginal teeth 2.0– 3.9 µm wide, outer marginal teeth 1.6–3.4 µm wide.


Despite being one of the commonest triphorids in the western Atlantic, S. intermedia  has its external morphology, operculum, jaw and radula firstly illustrated in the present study. Just like its congeneric species from the eastern Atlantic, the anterior portion of the animal has a dark pigmentation even after stored in ethanol ( Fig. 25View Fig A–B). The operculum of S. intermedia  , with a subcentral nucleus ( Fig. 25View Fig C–E), is similar to that of S. triclotae Bouchet, 1997  ( Bouchet 1997: fig. 9A). The tooth morphology of S. intermedia  is also very similar to those of S. similior ( Bouchet & Guillemot, 1978)  and S. triclotae  , with all teeth bearing three cusps but the marginal teeth showing a median cusp much elongated, 1.6–2.9× longer than outer cusps in S. intermedia  (two times longer in S. triclotae  ; two to four times longer in S. similior  ). The number of marginal teeth is also slight conservative in the genus, with 14 in S. intermedia  , 15 in S. triclotae  and 13–16 in S. similior  .


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