Inella harryleei, Rolan & Fernandez-Garces, 2008

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 : 46

“Inella” harryleei Rolán & Fernández-Garcés, 2008

Figs 2L , 30–32

Material examined USA – Florida State • [1, d] spec.; off Saint Petersburg ; 28°26´56″ N, 84°40´37″ W; 63 m depth;

24 May 2012; G. Paulay leg.; FLMNH 450495 .

Description of basic anatomy

OPERCULUM. Yellowish, ovate, flat, moderately thin but rigid, semi-transparent, 3.25 distinct whorls, nucleus slightly eccentric, dislocated ~37% from center toward margin; diameter of operculum does not exceed diameter of opercular pouch.

JAW. Wing-shaped; outer side with ~30 rows of scales, each scale often rhombus-shaped/squared, occasionally puzzle-shaped, rectangular or irregular; micro-pores in the posterior region, up to 380 nm in diameter; inner side with scales gem-like or leaf-shaped, surface smooth; scales of outer side 10.9– 16.5 µm long, 9.1–11.0 µm wide, ratio length/width 1.0–1.6 (rhombus-shaped/squared), 7.9–11.8 µm long, 4.5–6.1 µm wide, ratio length/width 1.3–2.6 (puzzle-shaped), 8.0– 9.9 µm long, 2.9–4.3 µm wide, ratio length/width 2.1–3.3 (rectangular); scales of inner side 11.8–19.4 µm long, 4.5–7.4 µm wide, ratio length/width 2.3–2.9 (gem-like), 15.1–17.7 µm long, 4.2–6.6 µm wide, ratio length/width 2.3–4.2 (leafshaped).

RADULA. Up to 37 overcrowded and undifferentiated teeth per row, comb-like and usually with five elongated cusps, but occasionally four or six/seven cusps, outermost cusps 39–77% of length of inner cusps; last marginal teeth with four to five triangular and pointed cusps, outer ones and median cusp (cusps 1, 3 and 5, when five cusps present) usually 53–74% of length of larger cusps; teeth with four cusps 4.4–4.7 µm wide, teeth with five cusps 3.7–5.5 µm wide (teeth in the center of row slightly wider than marginal teeth), teeth with six/seven cusps 6.0– 6.6 µm wide, last marginal teeth 3.0– 4.2 µm wide.

Remarks

“ Inella ” harryleei has a different radular morphology when compared to Inella obliqua (May, 1915) , which is the single species with illustrated soft parts of Inella s.s. ( Marshall 1983). The operculum of “ I ”. harryleei is slightly eccentric ( Fig. 30C ), similarly to I. obliqua and S. gaesona .

The undifferentiated and overcrowded teeth of “ I ”. harryleei resemble those of Monophorus olivaceus ( Figs 17–18 ) and M. erythrosoma , with a typical tooth bearing five comb-like cusps, in spite of slight variations in the number of cusps. Just like M. olivaceus , the last marginal teeth of “ I ”. harryleei are considerably reduced in size. Species of Monophorus are usually sampled at mid-low depths of the continental shelf ( Fernandes & Pimenta 2017a), considering that “ I ”. harryleei similarly inhabits depths of 63–90 m ( Rolán & Fernández-Garcés 2008; present study). However, “ I ”. harryleei shows significant differences in the shell (e.g., abapical spiral cord of teleoconch much developed) and operculum (with an ovoid shape, almost elliptical, and nucleus more eccentric) compared to Monophorus . Although it seems premature to reallocate “ I ”. harryleei in Monophorus , “ I ”. harryleei is certainly related to the informal “ Inella group” ( Marshall 1983).

Figures

Fig. 2. Specimens studied. A. Metaxia excelsa Faber & Moolenbeek, 1991 (MZSP 122353). B. Metaxia rugulosa (C.B. Adams, 1850) (BMSM 56034). C. Cosmotriphora melanura (C.B. Adams, 1850) (MNRJ 33980). D. Iniforis pseudothomae Rolán & Fernández-Garcés, 1993 (MZSP 100957). E. Latitriphora albida (A. Adams, 1854) (BMSM 55442). F. Monophorus olivaceus (Dall, 1889) (MNRJ 34615). G. Nanaphora verbernei (Moolenbeek & Faber, 1989) (MZSP 85022). H. Nototriphora decorata (C.B. Adams, 1850) (MNRJ 28941). I. Sagenotriphora osclausum (Rolán & Fernández-Garcés, 1995) (MNRJ 35061). J. Similiphora intermedia (C.B. Adams, 1850) (MNRJ 29763). K. Strobiligera gaesona (Dall, 1927) (MZSP 53685). L. “Inella” harryleei Rolán & Fernández-Garcés, 2008 (FLMNH 450495). Scale bars: 1 mm.

Fig. 30. “Inella” harryleei Rolán & Fernández-Garcés, 2008. A–G. FLMNH 450495. A–B. External morphology. C. Operculum. D–G. Radula. Scale bars: A–B = 1 mm; C = 200 µm; D–F = 10 µm; G = 2 µm.

Fig. 31. “Inella” harryleei Rolán & Fernández-Garcés, 2008, radula. A–F. FLMNH 450495. Scale bars: A, C–E = 10 µm; B, F = 5 µm.

Fig. 32. “Inella” harryleei Rolán & Fernández-Garcés, 2008. A–H. FLMNH 450495. A–H. Jaw, inner (B, F) and outer (C–E, G–H) sides. Scale bars: A = 100 µm; B, H = 10 µm; C–F = 20 µm; G = 5 µm.

Fig. 17. Monophorus olivaceus (Dall, 1889), radula. A. MNRJ 35075. B–F. MNRJ 34240. Scale bars: A, D = 10 µm; B–C, E–F = 5 µm.

Fig. 18. Monophorus olivaceus (Dall, 1889), radula. A–B. MNRJ 35075. C–F. MNRJ 34028. Scale bars: A, E = 10 µm; B = 2 µm; C = 20 µm; D, F = 5 µm.