Update: 2016.03.03




This website is a taxonomic synopsis of worldwide living scallops, glass-scallops and micro-scallops (Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae).

It contains the following items:

1. Introduction

2. Higher taxa

3. Genera & species (alphabetical catalogue)

4. Genera & species (chronological catalogue)

5. Species (systematical catalogue)

6. New taxa and nomina nova described by Henk H. Dijkstra

7. Publications of Henk H. Dijkstra

8. Terminology

9. Acronyms of institutions and museums



Red dot = type locality; blue dot(s) = distribution




Among conchologists scallops are a popular group of bivalves due to their different shape, size, sculpture and above all its richness of colour. Nearly 500 species are occurring in polar, temperate and tropical regions and are living in shallow waters (mainly pectinids) and deep-water (bathyally and abyssally: generally propeamussiids). Some species are of commercial interest and are aquacultured (Shumway, 1991).

In the past several authors worked on pectinoids (Smith, Dall, Bavay, Hertlein, Grau, and others) and more recently Waller (higher taxa) and Dijkstra (lower taxa). Recently an iconography of the family Pectinidae is published by Raines & Poppe (2006). An annotated catalogue of the families Propeamussiidae and Cyclochlamydidae will be published by Dijkstra in the near future.




PROPEAMUSSIIDAE Abbott, 1954 (glass-scallops)

Free or weakly byssate Pectinoidea with outer foliated calcitic layer on left valve and prismatic calcitic layer on main part of right valve disc. Inner layer crossed-lamellar aragonite beyond pallial line, in some species nearly to distal margins. Byssal notch without ctenolium.



Soft parts of Propeamussiidae - after Mikkelsen & Bieler (2008)



CYCLOCHLAMYDIDAE Dijkstra & Maestrati, 2012 (micro-scallops)

Very small Pectinoidea (c. 1.2 up to 6 mm in height) with a smooth or variously sculptured left valve with a flat, weakly or strongly inflated or even conical and pointed sculptured prodissoconch, in some species bordered by a strong flange-like commarginal lamella or rim. Right valve with a flattened sculptured prodissoconch, and commonly smooth or rarely antimarginally sculptured, with a simple outer prismatic layer of longitudinally hexagonal microstructure. Internal riblets lacking.


PECTINIDAE Rafinesque, 1815 (macro-scallops)

Byssate, cemented, or free living Pectinoidea with outer prismatic calcitic layer on right valve. Crossed-lamellar aragonite inside pallial line or entirely absent. Byssal notch with ctenolium, at least in early ontogeny.




Soft parts of Pectinidae - after Mikkelsen & Bieler (2008)

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