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Species / Lambis Lambis X Sowerbyi

Lambis Lambis X Sowerbyi

Stromboidea


2013

Description by Ricardo Villar, 1/2013:

  • Family Strombidae
  • Lambis sowerbyi x lambis

This may be a new species or form. It appears to be a hybrid of Lambis sowerbyi Mörch, 1872, and L. lambis (Linnaeus, 1758), as it shows features common to both species, in an intermediate degree.

As in the majority of strombids, the shell has a roughly biconical shape, with the body whorl slightly swollen, with convex sides, and with the outer lip expanded and thickened. There are six large spines on the outer lip and an additional one as an extension of the siphonal canal.

Two specimens were examined, with lengths from 211 mm and 220 mm respectively. Both came from the vicinity of Palawan Island, Philippines. As all Lambis species have pelagic larvae, long lived and with good dispersal possibilities, there is a probability that both specimens may be related.

The shell has a general shape rather similar to that of Lambis sowerbyi and L. lambis, with the following differences from each of these.

The shell is wider relative to its length compared with L. sowerbyi. The threads which form the sculpture on the body whorl are proportionally similar or weaker than those in L. sowerbyi and stronger than those in L. lambis. The shell is thicker and heavier than the average L. lambis of the same age and this is readily observable at the forward part of the lip, between the stromboid notch and the siphonal canal. Inside the aperture, near the siphonal canal at the anterior end and near the anal canal, there are very subtle plications, similar to those found rarely in some L. sowerbyi and normally in L. lambis.

The spire has nodules along the shoulders, not as large as those in L. sowerbyi but larger than in L. lambis. The apical end of the spire is pointed, not completely truncated, as in L. sebae, so the angle formed by it sides with the axis is larger than in the main part. The nodules on the dorsal part of the body whorl are of a size intermediate between those in L. sowerbyi and L. lambis.

The spines of the smaller specimen are similar to those in male L. lambis found in the Philippines and Indonesia comparatively smaller than those of the female and arranged horizontally when the animal is in its normal position, aperture down. The spines of the larger specimen are longer, slightly curved upwards, but not so long as those of female L. lambis from the same area. These spines are rather similar to those of L. sowerbyi.

The outer lip callus protrudes out of the initial lip along its edge and has tapering extensions underneath the spines, as in many specimens of L. sowerbyi.

The external colour may be white or creamy white with brown marks. Inside the aperture is of a reddish or orange colour, with the outer lip and collumellar callus greyish brown.

This species differs from Lambis arachnoides Shikama, 1971 in the following features:

  • The shell is not so long compared to its width.
  • The outer lip has only six spines, without even incipient ones and these are longer than in L. arachnoides.
  • The nodules on the first spiral row on the back of the body whorl are very small, nearly obsolete, unlike those in L. arachnoides which are roughly equal to those of the second row.
  • The spire nodules are not as big as in L. arachnoides.
  • It lacks the black spiral line along the spire suture, which is unique to L. arachnoides and L. millepeda.

Lambis arachnoides is generally considered to be a hybrid of L. truncata and L. millepeda. Is has in common with these two species the longish body whorl and the large nodules on the spire.

ADDITIONAL NOTES. The Specimen 1 was purchased from Tony Shells and the Specimen 2 was purchased from Conchology, Inc.

The plate shows four views of each specimen, from the dorsal , ventral, right and left sides respectively.

Should any formal publication decide to publish this description, I would like the give the new species or form the name Lambis lilikae, after my wife Lilik Villar.

At Chiclana, Spain 3rd of January 2013.

Ricardo Villar

Lambis lambis x sowerbyi; hybrids forms; Philippines Islands; Coll. Ricardo Villar


History and Synonymy

2012

Thach, 2012:

  • p. 13: "Hybrid shells of Vietnam: F35*: Hybrid between Lambis truncata s.l. & Lambis lambis, 235 mm"
  • p. 84: "Vietn. Name: Oc be que lai. Description: Shell large, fully developed, close to Lambis lambis (Linnaeus, 1758) in color of dorsum, structure of knobs on dorsum but also close to Lambis truncata s.l. in large size and long digitations. However, it differs from Lambis truncata s.l. in taller spire, higher knobs on shoulder of body whorl., less smooth transition from outer lip to aperture and lacking plicae in anterior aperture. It also differs from Lambis lambis in havier weight, not angled transition from outer lip to aperture (G. Kronenberg, personal comments 2011). Size: 235.5mm. Habitat: coral reef at 10-30m. Distribution: Binh Thuan. Occurence: rare in Vietnam."

2016

Villar described Lambis lilikae


Specimens from private collections

Lambis lambis x sowerbyi; Coron Island, Palawan Province, Mimaropa Region, Philippines; dived in 10-20 m; 221 mm; 1/2017; Coll. Ulrich Wieneke


References

  • N.N. Thach, 2012. New Records of Molluscs from Vietnam; 48HrBooks Company, Akron, pp. 1-276, pls. 1-151.
  • Villar R. (2016). Description of a new species of Lambis from Palawan, Philippines (Gastropoda, Strombidae). Xenophora Taxonomy. 10: 25-30.

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