Type material: Holotype (176.5mm long x 81.2mm wide) deposited at Paris National Museum of Natural History, France with Registration No MNHN-IM-2000-38160.
Other material: Paratype 1 (192.2mm) in Dr Thach collection and Paratype 2 (207.0mm) in J.Abbas collection. All types from type locality.
Type locality: Ly Son Island, Quang Ngai Province,Vietnam.
Habitat: near coral reef at 5-15m.
Diagnosis: The new species is characterized by very long digitations, orange and elongate aperture, moderately thick outer lip and pointed knobs at dorsal side. Description: Shell large (with length range 176.5-207.0mm), elongate-ovate in outline with ten long digitations (including siphonal canal). Shell width 49.7% of length and shell height 28.0% of length (see Table 29). Spire low with distinct sutures at dorsal side and well separated from the remaining shell by deep groove at ventral side. Sculpture consists at ventral side of many long, diverging ribs inside aperture and many elevated, widely-spaced spiral ribs at parietal wall; dorsal side sculptured with very elevated, axially elongate knobs and many broad, distant spiral ridges with various ribs and riblets in interspaces. Aperture subrectangular in outline with moderately thick outer lip which is oblique to shell axis and rather rectilinear. Stromboid notch wide and not deep. Siphonal canal long, not curved dorsally, posteriorly widely open and anteriorly angulate. Color dorsally yellowish white, ventrally white with purple parietal wall whitish ribs and orange aperture

The new species differs mainly from Lambis arachnoides Shikama, 1971 as follows: (1) digitations longer and more numerous, 10 versus 9 digitations, (2) outer lip more inflated, more rectilinear at median part with conspicuous grooves at base of each digitation, (3) spire shorter, not calloused at ventral side with stronger nodules, (4) different shape of stromboid notch, (5) siphonal canal longer and more widely-open, (6) first digitation more curved at base, (7) second digitation straighter, (8) seventh digitation more hooked, (9) different color, (10) different localities, Vietnam versus Taiwan.

The new species is distinguished mainly from Lambis millepeda (Linnaeus, 1758) in (1) less robust shell, (2) larger adult size, (3) posterior digitations longer and more slender, (4) aperture less rectangular in outline with orange, not purple color, (5) different shape of stromboid notch, (6) outer lip not convex at posterior part, (7) more numerous shoulder knobs at dorsal side, (8) spiral ribs less prominent at dorsal side, (9) different spire shape at dorsal side Etymology: The new species is named in honor of Nguyen Ngoc Hung Anh from Vietnam for providing the type material.