Dolabrifera edmundsi, Valdés & Breslau & Padula & Schrödl & Camacho & Malaquias & Alexander & Bottomley & Vital & Hooker & Gosliner, 2018

DOLABRIFERA EDMUNDSI View in CoL SP. NOV.

( FIGS 10E–F, 20–22)

Type material

Holotype at ZSM Mol 20160193, Porto Moniz, Madeira, September 2014, 18 mm preserved length.

Material examined

Porto Moniz , Madeira, September 2014, one specimen 17 mm preserved length, leg. P. Wirtz ( ZSM Mol 20160194), one specimen 19 mm preserved length, leg. P. Wirtz ( ZSM Mol 20160195), one specimen 20 mm preserved length, leg. P. Wirtz ( ZSM Mol 20160196), one specimen 20 mm preserved length, leg. P. Wirtz ( ZSM Mol 20160197). Ilhéu Bombom, Ilha do Príncipe, São Tomé and Príncipe, 20 January 2009, one specimen 11 mm preserved length ( CASIZ 179395 ) . South of Terrebonne Bay , LA, USA (28°5.57′N, 91°1.34′W), 56–58 m depth, 4 June 2005, four specimens 12–14 mm preserved length, leg. E. Garcia ( LACM 179615 About LACM ) GoogleMaps . Marsh Island , LA, USA (27°98.34′N, 92°22.42′W), 68–86 m depth, 22 June 2005, two specimens 11–16 mm preserved length, leg. E. Garcia ( LACM 179619 About LACM ) .

Description

External morphology: Body up to 80 mm long, oval to elongate, flattened, broader posteriorly, narrowing gradually towards head. Dorsum covered with small, rounded, scattered tubercles, each with retractile, highly ramified, papilla on apex ( Fig. 10E, F); tubercles typically surrounded by large areas of smooth tissue. Rhinophores enrolled, elongated. Oral tentacles wide, short, enrolled, with narrower bases. Parapodia fused together except for short region in posterior midline, forming two small flaps. Flaps partially overlapping in middle (right parapodium partially covers left one), allowing enough space anteriorly for inhalant opening and posteriorly for exhalant siphon to protrude. External sperm groove clearly visible on right side of animal, between mantle cavity and base of right oral tentacle.

External coloration: Background colour variable, typically greenish-grey or brown, sometimes red, with spots and/or irregular patches of different colours. Mantle margin with same general colour as rest of body.

Digestive system: Radular formula: 40 × 70.1.71 (ZSM Mol 20160195); 38 × 71.1.72 (ZSM Mol 20160196); radulae symmetrical, with just about same number teeth in both half-rows. Rachidian teeth with robust central cusp, two large denticles on each side ( Fig. 20A, D), all similar in size; cusp with or without denticles on both sides; rachidian teeth wider at base, both upper and lower ends of teeth convex. Some rachidian teeth with small extensions on apical ends. Lateral teeth elongate, with long bases ( Fig. 20B, E); each cusp with basal, narrow, inner denticle, apex bifurcated into two blunt denticles equal in length. Outer teeth very elongate, with or without secondary denticle, apex bifurcated ( Fig. 20C, F). Jaws with simple denticles ( Fig. 20J). Post-radular armature with numerous spines with elongate bases and triangular cusps ( Fig. 20K). Gizzard plates variable in shape, typically irregular, with numerous striations ( Fig. 20G–I).

Shell: Shell flat, well calcified, oval to elongate ( Fig. 21); nucleus conspicuous, formed by single lobe ( Fig. 20L–O). On apertural view with nucleus on upper end, left side of shell either concave or straight. Right side of shell convex, narrower near nucleus, widening slightly towards mid-length. Widest portion of shell mid-length. Sculpture of conspicuous growth lines.

Male reproductive system: Penial canal large, muscular, with two proximal retractor muscles, on each side of opening into body wall ( Fig. 22B–D). Penial canal widens gradually into oval penial sheath, containing penial papilla. Distal end of penial sheath connects to thick and strong retractor muscle attaching to ventral side of body wall internally. Penial papilla elongate, triangular, with longitudinal groove ( Fig. 22A).