Horaiclavus ordinei , Bonfitto, Antonio & Morassi, Mauro, 2014

Bonfitto, Antonio & Morassi, Mauro, 2014, Two new Horaiclavus (Horaiclavidae, Conoidea) species from the Indo-Pacific region, Zootaxa 3821 (1), pp. 146-150: 149

publication ID

http://dx.doi.org/10.11646/zootaxa.3821.1.12

publication LSID

lsid:zoobank.org:pub:9AE05BFB-F276-4F9E-B20E-413447E47BCE

persistent identifier

http://treatment.plazi.org/id/03FA87FE-FFC6-465E-FF51-FE18FB012577

treatment provided by

Plazi

scientific name

Horaiclavus ordinei
status

sp. nov.

Horaiclavus ordinei  sp. nov.

Figures 1 View Figure M– T

Type material. Holotype ( MZBAbout MZB 60081) and paratype ( MZBAbout MZB 60082).

Type locality. Balicasag Island, Philippines trawled by local fishermen at about 200 m.

Material examined. 2 dd from the type locality.

Description. Shell broadly claviform (b/l 0.53–0.57; a/l 0.41–0.44) ( Fig. 1 View Figure .M–P) with a moderately high orthoconoid spire and a short, contracted and quite strongly tapering base. Protoconch papilliform of about 1 ½ smooth whorls ( Fig. 1 View Figure S–T). Maximum protoconch diameter 0.57 mm. Teleoconch of up to about five whorls with deeply impressed, strongly wavy suture. Whorls strongly convex with an angled periphery just below mid-whorl height on earlier whorls, at middle on last two whorls. Subsutural ramp narrow, shallowly concave. Axial sculpture of strong, slightly arcuate and weakly opisthocline folds, extending from suture to suture, slightly weakening on subsutural ramp and extending on base but not on rostrum. Axial ribs of rounded triangular cross-section, interspaces concave, slightly broader to about the same width as ribs. There are nine axial folds on last two teleoconch whorls. Spiral sculpture commencing with a peripheral cord forming shoulder angle, joined on second whorl by a closely-spaced weaker cord below periphery, and a third cord near abapical suture on last two whorls ( Fig. 1 View Figure Q); in the paratype of fourth rather weak spiral cord in the interspace between the two adapical cords and cord bordering abapical suture. Last whorl has three spiral threads on base and five threads on rostrum. Aperture oval, with a distinct, narrow, proportionally long (for genus) siphonal canal. Inner lip has a relatively thick callus forming a weak parietal tubercle. Fasciole is strong; a shallow but distinct false umbilicus is present. Outer lip has with heavy varicoid-rib behind thin lip edge. Anal sinus shallow but distinct. Shell pale buff colored. Dimensions: Holotype: 5.8 x 3.1 mm, aperture height 2.4 mm. Paratype: 4.9 x 2.8 mm, aperture height 2.2 mm.

Etymology. Named after Professor Nuccio Ordine of the University of Calabria, Italy.

Remarks. Horaiclavus ordinei  sp. nov. is a rather peculiar species morphologically and is characterized by its small dimensions, relatively low spire, strong fasciole, relatively long siphonal canal and presence of few but distinct spiral cords. The southwestern Pacific species Horaiclavus phaeocercus Sysoev  in Fedosov & Kantor, 2008 and H. anaimus Sysoev  in Fedosov & Kantor, 2008 are superficially similar to the new species in proportions but attain a larger size (up to about 6 mm in length vs ca. 12 mm) and lack spiral sculpture on spire whorls. Among Horaiclavus  species, H. multicostatus ( Schepman, 1913)  from Indonesia has a distinct spiral cord forming a peripheral angulation on spire whorls, but otherwise spiral sculpture in restricted to base and rostrum. Shuto proposed the monotypic subgenus Anguloclavus Shuto, 1983  for H. multicostatus ( Schepman, 1913)  but the status of this latter taxon, as well as of the two species here described, will remain uncertain until anatomical and/or molecular features become known.

MZB

Museum Zoologicum Bogoriense