Paraliotipoma sirenkoi, 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 : 372

Paraliotipoma sirenkoi n. sp.

( Fig. 15 D-F)

TYPE MATERIAL. — Holotype: First Tropical Expedition of the Institute of Marine Biology 1974-1975, R/ V Kallisto, dredge stn 3, Bank Chiametan, also known as Sea Horse Shoal, South China Sea, 10°48’N, 117°45’E, 10-320 m, 17.II.1974, Boris Sirenko, H 2.7, D 4.2 mm ( ZISP 61624 /1), slightly worn specimen.

TYPE LOCALITY. — Bank Chiametan (Sea Horse Shoal), South China Sea.

DISTRIBUTION. — Known only from type locality, Chiametan Bank (Sea Horse Shoal), South China Sea, west of Palawan, Philippines.

ETYMOLOGY. — After the collector, Boris Sirenko, of Zoological Institute, St. Petersburg, Russiathe (ZISP).

DESCRIPTION

Shell ( Fig. 15 D-F)

Of about three whorls, height moderate, angulate at periphery; periphery slightly higher than midwhorl; profile below angulation evenly rounded; axial sculpture of strong primary ribs, 20 on final whorl in either spire or basal view; spinose and projecting in early whorls, less spinose in final quarter whorl; short stage preceding final lip lacking axial rib, but with imbricate sculpture of rest of shell. Axial sculpture of strong imbrications, about three lamellae between each major axial rib. Spiral sculpture of single low cord on shoulder; base with moderately strong subtending cord, and one cord of nearly equal strength between peripheral cord and subtending cord, and one cord serving as weakly indicated periumbilical cord. Umbilicus bordered by broad periumbilical cored, umbilical slope overridden by narrow axial ribs; umbilicus open, of moderate width, only partially obstructed by projecting extension of axial ribs across base of final half-whorl; umbilical wall with finely spinose angulation, becoming thickened and connecting to final lip. Final lip massive, extending for ⅓ of final quarter whorl, with successively decreasing layers of deposition, with only weak indentations conforming to spiral sculpture. Aperture nearly radial, plan of aperture only slightly outside of coiling axis.

Figures

FIG. 15.— A-C, Rhombipoma rowleyana n. gen, n. sp. holotype (AMS C.212474,ex LACM stn 86-250),N end of Mermaid Reef, Rowley Shoals,off northern Western Australia,18-20 m,H 1.5,D 3.2 mm (base of shell broken and filled with agglutinated sand);D-F, Paraliotipoma sirenkoi n. gen., n. sp. holotype (ZISP 61624/1), Sea Horse Shoal, South China Sea, 10-320 m, H. 2.7, D 4.2 mm. Scale bars: 1 mm.