Goniofusus strigatus ( Philippi, 1850 )

Goniofusus strigatus ( Philippi, 1850) View in CoL ( Figs. 27-30 View Figure 27 View Figure 28 View Figure 29 View Figure 30 )

Fusus strigatus Philippi, 1850: 116-117 View in CoL (pl. 5, fig. 3); Lyons & Snyder, 2019: 15-17, 34.

Fusinus brasiliensis View in CoL : Morretes, 1949: 100; Rios, 2009: 249 (fig.); Couto & Simone, 2019: 43-44 (figs. 1F, 9C, 11B, 1 3B, 30C, 31C) (non Grabau, 1904).

Fusinus strigatus View in CoL : Rios, 1970: 97 (pl. 29), 1975: 105 (pl. 30, fig.447),1985:108(pl.37,fig.478),2009:251(fig.); Petuch & Berschauer,2016:262; Lyons & Snyder,2019: 20.

Fusinus marmoratus View in CoL : Petuch & Berschauer, 2016: 262 (non Philippi, 1851).

Goniofusus strigatus View in CoL : Vermeij & Snyder, 2018: 62-63; MolluscaBase, 2023.

Type: Unknown.

Type locality: Not stated.

Diagnosis: Shell usually of ~ 70 mm. Spire narrow, ~40°; axial sculpture reaching last whorl in same intensity as in spire. Specimens with angulated whorls, rounded whorls, and intermediary whorls in approximately in same records. Sculpture more intense and uniform.

Differential redescription: Shell about 70 mm. Elongat- ed, ~3 times longer than wide; spire~41% of total length,

last whorl ~56% of total length. Spire angle ~40°. Spire up to 9 convex whorls; suture well-marked, with angle ~90°. Protoconch ( Fig. 27 View Figure 27 G-H) of 2 whorls, first whorl smooth, bulged, second whorl with same size as preceding whorl, with gradual appearing of axial riblets in last half whorl, each riblets interspaced by equivalent width as their width, interspaces fulfilled by minute spiral striae. Transition protoconch-teleoconch abrupt, orthocline ( Fig. 27H View Figure 27 ). Sculpture 9-10 low spiral cords, of rounded profile, interspaces equivalent to half their width; additionally strong, wide axial undulations (10 in penultimate whorl), being taller at middle, in which spiral cords may be rounded ( Fig. 27 View Figure 27 D-E), up to forming blunt beaks ( Fig. 27 View Figure 27 A-C), with some intermediary specimens ( Fig. 27F View Figure 27 ); axial undulations persisting up to aperture. Last whorl with ~12 spiral cords similar to those of preceding whorls; same sculpture along siphon, as oblique cords ( Fig. 27C, E View Figure 27 ); associated 9-10 string axial undulations similar to those of spire. Aperture elliptic, ~1.6 limes longer than wide; anal notch almost absent. Canal relatively cylindric, straight, with 30% of shell length, and ~30% of last whorl width in its base. Outer lip simply arched or angular, weakly sinuous because of spiral sculpture; inner lip weakly concave, callus narrow, thin, not exceeding apertural limit. Umbilicus very narrow in siphon base.

Operculum ( Fig. 27K, L View Figure 27 ): Similar to preceding species. Differing in being lighter brown ( Fig. 27D, F View Figure 27 ). Nucleus more centrally positioned. Concentric lines in scar more numerous ( Fig. 27L View Figure 27 ).

Head ~half of head-foot width ( Fig. 28A View Figure 28 ); cephalic tentacles (te) more elongated. Head flap-like ( Fig. 29A View Figure 29 ). Females with more widely opened cement gland ( Fig. 27B View Figure 27 : cg). Siphon stubby, very muscular ( Fig. 28C View Figure 28 : si), with strong elongated base anterior to gill. Gill ( Fig. 28C View Figure 28 : gi) slightly broader than osphradium (os), ~40% longer, with right-triangle-shaped filament ( Fig. 28D View Figure 28 ). Osphradium symmetric ( Fig. 28D View Figure 28 : os), with pointed filaments. Proboscis long, slightly broad- er ( Fig. 29A, B, D View Figure 29 : pb). Rhynchostome as small pore ( Fig. 29A View Figure 29 : ry). Odontophore elongated, similar to preceding species ( Fig. 29A, B View Figure 29 ), except for bifurcation of m11 being in its middle level ( Fig. 30B View Figure 30 : m11), and longer exposition of radular sac along m2a ( Fig. 30A View Figure 30 ).

Radula ( Fig. 27I,J View Figure 27 ) similar to that of G.phoenix , distinctions following. Rachidian having 3 terminal,larger, more spaced cusps, and narrower basal reinforcement. Lateral teeth slightly more arched, having less – 11 – cusps, being middle cusps more elongated.

Mid esophagus with valve of Leiblein proportionally smaller ( Fig. 29B View Figure 29 ). Pair of salivary gland ducts running attached to esophageal wall short distance anterior to valve ( Fig. 29B, C, F View Figure 29 : sd). Salivary aperture much more anteriorized in dorsal surface of buccal cavity ( Fig. 29E View Figure 29 : sa). Gland of Leiblein ( Fig. 29B View Figure 29 : gl) of medium size, broad anteriorly, abruptly filiform posteriorly; its duct (ld) broader. Penis relatively small ( Fig.28A View Figure 28 :pe), with base wide, tapering gradually up to pointed tip ( Fig. 30C View Figure 30 ), lacking terminal papilla; penis duct (pd) totally closed (tubular). Nerve ring ( Fig. 29B View Figure 29 : nr) similar to preceding species.

Distribution: Alagoas to north Rio de Janeiro coasts.