Oliveragemmula kieneri


Oliveragemmula kieneri is a species of sea snail, a marine gastropod mollusk in the family Turridae, the turrids.
Its mineralized tissue is made up of calcium carbonate. One may find it in a water depth of 50m to 346m.
;Subspecies:
  • † Gemmula kieneri ryuktjuensis MacNeil, 1960
  • † Gemmula kieneri woodwardi
Oliveragemmula kieneri is a species of predatory sea snail, a marine gastropod mollusk belonging to the family Turridae, commonly known as the turrids . It was formally described by Emile Doumet in 1840 as Pleurotoma kieneri . This species is a significant member of the genus Oliveragemmula, a group of deep-water snails primarily found in tropical waters .

Description

The shell of Oliveragemmula kieneri is robust and fusiform, with its length varying considerably between 26.2 mm and 73 mm . This range indicates that it can grow to a moderately large size for a turrid snail.
Key features of the shell, also common to the genus Gemmula to which it originally belonged, often include:High Spire: The shell typically has a tall, pointed spire .Whorls: It possesses multiple whorls, often numbering around 10 or more .Sculpture: The surface ornamentation is characteristic of the genus, featuring strong spiral cords and axial ribs or nodules. A prominent subsutural fold, often composed of two closely spaced gemmate cords, is a common trait. Below this, there are typically two major cords between the peripheral carina and the lower suture, with finer threads in the interspaces . The sculpture often creates a nodular or beaded appearance, particularly on the shoulder of the whorls .Anal Sinus: A distinctive feature of turrids is the anal sinus, a deep notch or slit on the outer lip of the aperture, located near the suture. In Gemmula, this sinus is typically well-defined and often U-shaped .Siphonal Canal: The shell possesses a relatively long, narrow anterior canal .Coloration: While descriptions of specific color patterns are not always detailed, Gemmula species can exhibit variations in shades of white, cream, and light brown, sometimes with subtle banding .
A.W.B. Powell, a significant authority on Turridae, noted the close morphological similarity between O. kieneri and Oliveragemmula speciosa, another well-known species in the genus . The exact nuances distinguishing them often require careful examination of sculptural details and anatomical features.

Distribution

Oliveragemmula kieneri is a widespread marine species found across the Indo-Pacific biogeographic region . Its recorded distribution includes:
This extensive distribution highlights its adaptation to the warm, tropical waters of the Indo-Pacific.

Habitat and Ecology

Oliveragemmula kieneri is a benthic species, meaning it lives on or near the seabed . It is typically found in deeper tropical waters, with recorded depths ranging from 20 meters to 346 meters . Studies on Gemmula species in the Philippines have collected specimens from depths between 50 and 100 meters, often as by-catch from commercial fish trawlers . Other collection methods, such as tangle nets, have yielded specimens from even greater depths, up to 600 meters for the genus overall, indicating a preference for sublittoral to bathyal zones .
The preferred substrate for O. kieneri is typically sand or muddy sand . Like other members of the superfamily Conoidea, these species are predatory marine snails. Research suggests that species within the genus Gemmula are specialized worm-hunters, primarily preying on Terebellidae . Their feeding behavior and detailed ecology are still being studied, partly due to the inaccessibility of their deep-water habitats and their often nocturnal and burrowing habits .

Taxonomy and Synonyms

The original binomial name was Pleurotoma kieneri Doumet, 1840 .
Synonyms of Oliveragemmula kieneri include :Pleurotoma carinata Reeve, 1843 Pleurotoma kieneri Doumet, 1840
It is important to note that a recent taxonomic revision has proposed a new genus, Oliveragemmula Kantor, Bouchet, Fedosov, Puillandre & Zaharias, 2024, and Gemmula kieneri has been assigned to this new genus as Oliveragemmula kieneri . This reclassification reflects ongoing efforts to refine the systematics of the complex Turridae family based on comprehensive morphological and molecular data . However, the original Gemmula kieneri name is still widely recognized in many sources.