Dallina

Small to large, triangular to subquadrangular in outline; rectimarginate to paraplicate; beak erect, without beak ridges; foramen small to large, mesothyrid, attrite, symphytium concave. Hinge teeth small, weak; pedicle collar very short. Cardinalia lamellar with excavate inner and outer hinge plates separated by narrow crural bases; inner hinge plates converging on median septum to form V-shaped septalium; cardinal process not differentiated; median septum low anteriorly, extending beyond midvalve; adult loop teloform. File:Dallina septigera brachial.jpg|Dallina septigera, brachial valve, 24mm long, near the Philippines File:Dallina septigera pedicle valve.jpg|pedicle valve File:Dallina septigera anterior.jpg|anterior view File:Dallina septigera internal 2.jpg|interior view File:Dallina septigera lateral.jpg|lateral view == Taxonomy ==

Nine extant species are recognized (though one has recently been synonymized), these are listed below: • Dallina septigera (Lovén, 1845), Type species of genus, from northeastern Atlantic. • Dallina elongata Hatai, 1940, recorded from Sea of Japan. • Dallina profundis Konjukova, 1957 (junior synonym of Glaciarcula spitzbergensis) • Dallina raphaelis (Dall, 1970), recorded from off Japan. • Dallina tasmaniaensis Verhoeff, 2023, southeastern Australia. • Dallina triangularis Yabe & Hatai, 1934, recorded from off Japan and possibly Lau Ridge. == References ==