Manaria hadorni n. sp.
TYPE LOCALITY - Solomon Islands, east of Rendova Island.
DISTRIBUTION- Western Pacific, known from the Solomon Islands and the continental slope around New Caledonia; alive in 406-720 m, 470-509 m. Syntopic with M. fluentisona n. sp. in New Caledonia (BATHUS 1 stn CP698; BATHUS 4 stn CP948) and with M. explicibilis n. sp. in the Solomons (SALOMON 2 stn CP2291).
DESCRIPTION - Shell of medium size, up to 39.9 mm, rather thick, solid, white. Shape slender with elongate spire, base elongate, siphonal canal moderately short. Apex eroded (holotype), protoconch of paratype MNHN IM-2000- 27031 slightly more than 1.5 smooth, glossy whorls. First whorl inclined relative to coiling axis by -30°. Transition to teleoconch abrupt, marked by fine, slightly flared larval lip. Teleoconch of roughly nine weakly convex whorls. Suture distinct, shallow. First and second teleoconch whorls with six fine spiral cords, interspaces each twice as wide as one cord. From third whorl, seven narrow spiral cords, two subsutural spiral cords finer; interspaces wide, of equal width. Spiral cords remaining fine on subsequent whorls, slightly wider when crossing axial ribs on few specimens. Penultimate whorl with eight spiral cords. Few specimens with additional, fine, subsutural cord or single, fine secondary spiral cord at mid-whorl (paratypes MNHN IM-2000-27031 and MNHN IM-200027032). Last whorl with ca. 20 spiral cords, ten on whorl of which two subsutural cords finer, ca. ten on base and siphonal canal. Spiral cords on base roughly same width as on whorl but slightly less pronounced. All spiral interspaces with dense sculpture of fine, sharp growth lines. Upper spire whorls with 10-11 sharp axial ribs, interspaces rather wide. Penultimate and last whorls each with 12 axial ribs. Aperture semi-ovate. Columella slightly impressed, smooth. Outer lip thick, with 11 internal lirae, edge sharp. Siphonal canal short, rather wide, open. Aperture and siphonal canal together slightly more than two-fifths of total shell height. Periostracum unknown.
REMARKS-Manaria hadorni n. sp. is characterized by its slender shape and tall spire, rather convex whorls, fine, equally spaced spiral cords with wide interspaces, narrow axial ribs, the presence of a single secondary spiral cord in two or three spiral interspaces around the periphery of the penultimate and last whorls, the presence of two to four subsutural spiral cords that remain fine while the other cords gradually become coarser, and the rough periostracum. Manaria explicibilis n. sp. differs from M. hadorni n. sp. in its sharply shouldered axial ribs giving the whorls an angulated appearance, the finer and fewer primary spiral cords (three to four in a few specimens, on the spire whorls), the wider, smooth spiral interspaces (a few specimens, may have one or more interspaces with a fine secondary spiral cord) and the slightly smaller adult size. Manaria corporosis n. sp. differs from M. hadorni n. sp. in its slightly shouldered axial ribs on the upper spire whorls giving the early whorls a weakly angulated appearance, the broader whorls and the wider primary spiral cords with narrower interspaces. Manaria jonkeri possesses similar sculpture to that of M. hadorni n. sp. but differs in the shouldered axial ribs forming a shoulder on the upper spire whorls, the more convex penultimate and last whorls, the more constricted base, the narrower spiral interspaces and the smaller adult size.
Manaria loculosa n. sp. also possesses similar sculpture to that of M. hadorni n. sp., also occasionally with a fine secondary spiral cord in the interspaces, but differs in the broader shape with a shorter siphonal canal, the more strongly convex whorls, the typically slightly finer spiral cords with narrower interspaces, and the two finer subsutural spiral cords. ETYMOLOGY-Manaria hadorni n. sp. is superficially similar to some Fusinus species and, therefore, we name this species to honour Roland Hadorn from Switzerland, for the many years of friendship and collaboration while studying deep water Buccinidae and, especially, Fasciolariidae. His vast knowledge of the Fusininae has already resulted in a multitude of publications that are a great contribution to malacology.