Conus garrisoni (Hendricks, 2015)

 

 

Description (1)

 

Shell size. Shell moderately small (largest observed specimen, PRI 67197, is 27.2 mm). Last whorl. Conical (RD 0.66–0.67, μ = 0.66; PMD 0.87–0.92, μ = 0.89; n = 3); outline convex, except at anterior third, which is slightly concave. Shoulder angulate to subangulate, nearly smooth in mature specimens. Widest part of shell at or just below shoulder. Aperture uniform in width from base to shoulder. Siphonal notch absent. Fine spiral threads extending from base to shoulder in smaller specimens, restricted to anterior quarter in larger specimens. Spire whorls. Spire height moderate (RSH 0.15–0.22; n = 3); outline straight to slightly sigmoidal. Protoconch multispiral, diameter 0.8 mm (based on PRI 66166). Tubercles present on

first 6 postnuclear whorls, diminishing thereafter. Sutural ramp slightly sigmoidal in early whorls, convex in later whorls, ornamentation absent. Subsutural flexure symmetrical, depth about equal to width (1).

 

Coloration pattern. Two noninteracting patterns present. The primary (base) pattern consists of irregularly shaped and sometimes branching axial blotches that span the last whorl. The secondary pattern consists of two broad spiral bands that cover a majority of the last whorl, but not the center region. The two patterns differ in the color of emitted light. Axial markings associated with the primary pattern extend onto the sutural ramp(1).

 

Etymology

Named in honor of American abolitionist and suffragist William Lloyd Garrison (1805–1879) (1).

 

Remarks

Conus garrisoni is not similar to co-occurring fossil species, but is very similar in shell morphology and coloration pattern to the extant, and highly variable, western Atlantic species Conus cardinalis Hwass in Bruguière, 1792. An important difference appears to be the protoconch, which is multispiral in C. garrisoni, but paucispiral in C. cardinalis (Kohn reported C. cardinalis to have 1.25–2 protoconch whorls). Tucker and Tenorio (2009) assigned C. cardinalis to the genus Purpuriconus da Motta, 1991, which Puillandre et al. [2] recognized as synonymous with the subgenus Dauciconus. While the phylogenetic context of C. cardinalis has not yet been formally explored, the strong similarity between C. garrisoni and C. cardinalis supports the assignment of the fossil species to this subgenus (1).

 

 

 

 

Fig 24. Conus (Dauciconus) garrisoni Hendricks sp. nov.

All specimens are from locality station TU 1422 (Cercado Fm.).

(A-F) PRI 66166 (holotype), SL 19.8 mm;

(G-H) PRI 67197 (paratype), SL 27.2 mm; (I-J) PRI 67194 (paratype), SL 14.2 mm;

(K) PRI 67196 (paratype), SL 20.8 mm.

 

 

 

 

 

 

 

Bibliografia Consultata

 

·         (1) - Hendricks (2015) “Glowing Seashells: Diversity of Fossilized Coloration Patterns on Coral Reef-Associated Cone Snail (Gastropoda: Conidae) Shells from the Neogene of the Dominican Republic”