Liotipoma magna, Mclean, 2012

Mclean, James Hamilton, 2012, New species and genera of colloniids from Indo-Pacific coral reefs, with the definition of a new subfamily Liotipomatinae n. subfam. (Turbinoidea, Colloniidae), Zoosystema 34 (2), pp. 343-376 : 358-362

publication ID

https://doi.org/ 10.5252/z2012n2a10

persistent identifier

https://treatment.plazi.org/id/6C26A814-FF8B-147C-DA04-7DAA69B4F469

treatment provided by

Felipe

scientific name

Liotipoma magna
status

sp. nov.

Liotipoma magna View in CoL n. sp.

( Figs 8 View FIG ; 9 View FIG )

TYPE MATERIAL. — Holotype: SANTO 2006, stn DS103, Vanuatu, SE Santo, off Tutuba Island , 15°34.1’S, 167°16.0’E, 70-80 m, diving team, ♂ shell, H 3.6, D 6.8 mm ( MNHN 24766 View Materials , Fig. 8 View FIG A-D). GoogleMaps

Paratypes: SANTO 2006, stn DS104, W Tutuba Island , 15°34.1’S, 167°16.0’E, ♂ shell, H 3.4, D 5.3 ( MNHN 24767 View Materials , Fig. 8 View FIG E-H). — SANTO 2006, stn DS105, NW Tutuba Island, 15°33’S, 167°16.7’E, 92 m, 2 ♀♀ shells ( MNHN 24768 View Materials , Fig. 9 View FIG A-D, H 3.6, D 5.7 mm; MNHN 24769 View Materials , Fig. 9 View FIG E-H, H 3.4, D 5.3 mm) GoogleMaps .

TYPE LOCALITY. — Vanuatu, Espiritu Santo.

ETYMOLOGY. — Latin, “magnus”, large, befitting for the largest known species of Liotipoma .

DISTRIBUTION. — Known only off Espiritu Santo, Vanuatu.

DESCRIPTION

Male shell ( Fig. 8 View FIG )

Whorls 3.0; profile moderately high for genus; peripheral angulation at mid-whorl, shoulder ramp slightly convex above, profile below peripheral angulation evenly rounded. Axial sculpture of strong ribs, 32 on last whorl; spinose and projecting in early whorls, spinosity much diminished in final third whorl and axials more closely spaced in final whorl. Spiral sculpture of three low cords on shoulder; base with strong subtending cord, and two cords of nearly equal strength between peripheral cord and subtending cord; umbilicus bordered by broad, angular emergent cord, overridden by narrow axial ribs. Umbilicus partially open, partially obstructed by emergent tongue of lip; tip of tongue directed toward coiling axis. Final lip massive, extending for ⅓ of final quarter whorl, showing about twenty successively decreasing layers of deposition, lip conforming to spiral sculpture; tongue extending half the diameter of aperture on previous whorl, showing similar layers of deposition decreasing in extent. H 3.6, D 6.8 mm (holotype); H 3.4, D 5.3 mm (MNHN 24767, stn DS104).

Female shell ( Fig. 9 View FIG )

Two specimens from Espiritu Santo have holes in the shell in the apical area but are determined as females of this species for their large size and matching sculpture. Both have short tongues that serve to increase the volume of the umbilical cavity. The specimen in Figure 9 View FIG A-D lacks a projecting tongue; that of Figure 9 View FIG E-H is higher in profile and has a very narrow extension of the lip that extends to the umbilical edge. Both specimens show a larger volume for the umbilical cavity than the male shells in the tilted views. H 3.4, D 5.3 mm ( Fig. 9 View FIG E-H).

Operculum and radula

Unknown.

REMARKS

This is the largest known species of Liotipoma . The closest comparison is with L. splendida n. sp. ( Fig. 13 View FIG A-D), which is smaller in diameter by 1.5 mm, and has a comparable number of axial ribs. Liotipoma magna n. sp. differs in having a short, triangular apertural tongue directed toward the coiling axis, rather than the broad, stubby tongue directed in advance of the aperture of L. splendida n. sp. The two male shells differ in detail of the umbilical cavity, as do the female shells. The differences are considered to be intraspecific.

This species is unusual for Liotipoma in differing from the general observation that female shells are larger than male shells because the first illustrated male shell ( Fig. 8 View FIG A-D) is greater in diameter by more than 1 mm than both female shells. The female shell of Figure 9 View FIG E-H has the high profile expected in a female shell.

This is the only species so far known from Vanuatu.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Trochida

Family

Colloniidae

Genus

Liotipoma

Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF