Palliolum tigerinum (Müller, 1776)Pectinoidea : Pectinidae
To size: To 30mm. Shell Structure: Thin but strong. Equivalve: LV a little more convex than RV. Outline: Suboval, ventral disc almost circular, dorsal part with straight to slightly concave (posterior) margins (umbonal angle ca. 85°). Ears very unequal, anterior at least 3x longer than posterior, posterior ears small, indistinct. Contour: Small byssal notch in RV, ctenolium well-developed.
Sculpture: Macrosculpture smooth to finely ribbed, occasionally plicate. If ribbed up to 50 in number rather fine and low. If plicate margins often inturned. Microsculpture antimarginal on both valves. Ears with radial ribs, 4-5 anterior, 5-8 posterior. Margin: Finely crenulate if ribbed. Colour: Variable most often shades of reddish to purplish brown, also cream, yellow, brown , patterned mottled, blotched or rayed.
Distribution & Ecology
On a variety of coarse sediments from the lowest intertidal and across the shelf. Widespread but scarce or absent from the southern North Sea.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
The three species of Palliolum can be confused, especially when young.
Anterior ear sculpture - strongly cancellate
Posterior ear - disproportionately short
Height distinctly greater than length
Riblets not carrying scales
Listed are literature citing Palliolum tigerinum (Müller, 1776). Reference containing the species Type Description is highlighted.
Dijkstra H, Warén A & Gudmunsson G 2009. Pectinoidea (Mollusca: Bivalvia) from Iceland. Marine Biology Research. 5: 207-243.
Janssen AW & Dijkstra HH 1996. Morphological differences between two species of Palliolum (Bivalvia, Pectinidae). Basteria. 59: 107-113.
Müller O F 1776. Zoologiae Danicae Prodromus, seu Animalium Daniae et Norvegiae Indigenarum, characteres, nomina, et synonyma imprimis popularum Havniae (Copenhagen): Typis Hallageriis. 281pp.
Wagner H.P. 1991. Review of the European Pectinidae (Mollusca: Bivalvia). Vita Marina. 41 (1): 3-48.
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