Janthina globosa
Swainson, 1822
Description:
Dimensions range from 12 mm - 38.5 mm high and 10 mm - 22 mm wide.
Width to height ratio: 0.83:1 ~ 0.57:1
Shell: globose; lightweight; small to moderately small. Exterior colour reddish to dark violet or purple, with diffuse, narrow pale violet band below suture, base or upper whorls sometimes a bit darker. About 4 whorls, rounded, often slightly shouldered . Suture narrowly canalised. Umbilicate: closed, or very narrow, partially covered by a thin columellar callus. Intercostal spaces sculptured by weak, irregular V-shaped growth lines. Base slightly convex with a few weak spiral lines. Columella slightly bent, smooth, long, often forming with the lower part of outer lip an open canal. Aperture oval, longer than broad,more than half of shell length, extended anteriorly in some specimens; outer lip thin, indented in the centre.
Distribution:
World-wide, in tropical and temperate seas; Cocos Keeling Islands [Maes, 1967:117]; Andaman Sea and Gulf of Thailand [Wells et al., 2021:128]; available Australian specimens range from southern Queensland southwards to Bermagui, NSW [Beechey, 2008]; Northern Territory, Qld, NSW, Tasmania, New Zealand, Hokkaido to Honshu Japan [Beu, 2017: 184]; entire Gulf of Mexico, North Carolina to Brazil [Rosenberg et al., 2009:643]; Panamic province [Keen, 1958:280]
Habitat:
Pelagic, found washed up on beaches
Etymology:
from globosus [latin] = spherical or globular
Type Material:
none mentioned in source material for Janthina globosa Swainson, 1822. []
Swainson, W. (1822). Plate 85. Fig. 2.
Distribution
as listed in source literature
Blainville, H. M. D. de (1822).
Shown in text as Janthina prolongata Blainville, 1822
pp: 155.
original description Janthina prolongata Blainville, 1822
Swainson, W. (1822).
Plate 85. Fig. 2.
Plate 85. Fig. 3.
pp: 16.
Original description
Orbigny, A. D. d' (1841).
Shown in text as Janthina prolongata Blainville, 1822
pp: 414.
Reeve, L. A. (1858).
Shown in text as Ianthina iricolor Reeve, 1858
Plate V. Fig. 23b.
Plate V. Fig. 23a.
Shell somewhat globose, very thin, with an obtusely conical spire, more or less immersed; whorls rather narrow, rounded, concentrically and irregularly plicate-striate, with the striae sinuated at mid-whorl; purplish-violet, translucent and iridescent; columella scarcely reflexed, somewhat twisted; aperture wide open, with the base somewhat channeled.
Reeve, L. A. (1858).
Shown in text as Ianthina decollata P. P. Carpenter, 1857
Plate IV. Fig. 19a.
Plate IV. Fig. 19b.
Shell globose, with a short, slightly immersed spire; whorls impressed at the sutures, then rounded, finely decussately striated throughout; whitish, purplish-violet at the spire and base; columella slightly reflexed, pressed against the upper part, then prolonged; aperture somewhat broad, slightly sinuate in the middle, with a channel at the base.
Reeve, L. A. (1858).
Plate IV. Fig. 18b.
Plate IV. Fig. 18a.
Shell globose, thin, inflated, with a short, slightly immersed spire; whorls impressed at the sutures, then rounded, finely decussately striated throughout; whitish, purplish-violet at the spire and base; columella slightly reflexed, elongated; aperture broad, open, slightly sinuate in the middle, with a channel at the base.
Tryon, G.W. (1887).
Plate 10. Fig. 11.
Plate 10. Fig. 12.
pp: 37.
Note: in the text, listed as a synonym of Var. pallida, figure 16 Ianthina striolata A. Adams & Reeve, 1850 is now recognised as Janthina pallida W. Thompson, 1840. See Janthina pallida W. Thompson, 1840 for details
Keen, A. M. (1958).
Shown in text as Janthina prolongata Blainville, 1822
pp: 281. Fig. 170.
Beechey, D. (2008).
Shown in text as Janthina prolongata Blainville, 1822
pp: Janthina prolonga. Fig. 1.
South coast of NSW (DLB4296)
pp: Janthina prolonga. Fig. 2.
South coast of NSW (DLB4296)
Beu, A. G. (2017).
pp: 123. Plate 2. Fig. G.
Janthina globosa (Swainson); G, GNS WM15254, beach, Mauritius, Indian Ocean;
pp: 123. Plate 2. Fig. H-I.
Janthina globosa (Swainson); H
pp: 123. Plate 2. Fig. J.
Janthina globosa (Swainson); H
Alf, A., Brenzinger, B., Haszprunar, G., Schrödl, M. & Schwabe, E. (2020).
