Lutraria angustior Philippi, 1844
Mactroidea : Mactridae
Inequilateral, beaks to anterior.
Elongate ovate, beaks one third the way along the dorsal margin. Anterior dorsal margin relatively short, slightly curved to anterior margin which is broadly rounded. Posterior dorsal margin twice the length of anterior leading to rounded (more narrowly than anterior) posterior margin. Dorsal margin straight at beaks. Ventral margin curves down slightly one third of the way along ventral margin to mirror the beaks.
Large posterior and narrow anterior gape so that the valves only meet at the hinge and a small region of the ventral margin. Animal is able to use hinge to narrow the posterior gape and open the anterior slightly by rocking the hinge.
Sculpture: Concentric lines and ridges. Margin: Smooth. Ligament: External small, dark brown and deep. Internal part on a large spoon-shaped chondrophore, the top is just under the beaks and the bottom angled to the bottom left of the valve. Hinge: LV two cardinals in inverted v-shape anterior to ligament pit (and a single thin cardinal behind these just in front of the ligament pit). A single long, thin, anterior lateral exists, which frequently breaks off. RV two cardinals, the anterior, consisting of two overlapping teeth, curves downwards diverging the posterior at 60°-80°, one single posterior lateral. Pallial Musculature: Deep pallial sinus to beaks, pallial sinus runs almost parallel to pallial line and they are confluent for part of the distance. This distance varys from specimen to specimen, but the sinus touches the line unlike L. lutraria which is not at all confluent and a v-shape is formed where the two are joined. Periostracum: Thin, pale brown. Colour: White.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Mactroidea : Mactridae
Listed are literature citing Lutraria angustior Philippi, 1844. Reference containing the species Type Description is highlighted.
Holme N.A. 1959. The British Species of Lutraria (Lamellibranchia), with a description of L. angustior Philippi. Journal of the Marine Biological Association of the United Kingdom. 38: 557-568.
Philippi R A 1844. Enumeratio molluscorum Siciliae cum viventium tum in tellure tertiaria fossilium, quae in itinere suo observavit. Vol. 2 303pp. Eduard Anton, Halle. pls 13-28.
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