« 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. » – H. K. Dijkstra: scallop.nl.
 

Shells inequivalve, wider than high, equilateral; valves gaping. Left valve more convex than right valve. Sculpture of fine radial folds (like in Pecten) and striae, crossed by weaker growth-lines; intervals between radials crenulated.
 

« Inequivalve, small, fragile, almost circular camptonectinine, valves almost equal convex, sculptured with commarginal rows of scales or vesicles, spinose radial ridges and/or fine antimarginal striae; byssal notch well developed; ctenolium prominent. » – H. H. Dijkstra: “Pectinoidea from the Panglao region, Philippine Islands”, Vita Malacologica 10, 2013, p.24.
 

Shells that « at first glance resemble the Peplum at all, whereas they are closer to the Aequipecten. Their most marked character lies in the inequality of costal ornamentation in the two valves. » – F. Sacco: I molluschi dei terreni terziarii del Piemonte e della Liguria part.24, Torino 1897, p.39-40. This group is « easy to separate from the other Pecten by their strong smooth ribs without imbrications and by the variability of their resplendent colours » (Monterosato, 1899).
 

Shell « rather delicate. Valves inequilateral, left valve more convex than the right one. Pronounced (primary) ribs of left valve single and hollow, hiding riblets formed by rows of small tubercles, that become visible when the ribs are damaged. Secondary ribs also consist of rows of small tubercles which, however, are not hidden. In between primary and secondary ribs fine grooves may be observed. All ribs of right valve equally pronounced, but clustered on broad plicae that coincide with the interspaces between the pronounced ribs of the left valve. Ribs appear gradually at equal distances from the apex. Anterior auricles twice as large as posterior, with a reticulate structure carrying tubercles at each crossing-point. In between this structure fine grooves are visible. Posterior auricles with tuberculous ribs only. » – H. P. Wagner: “The status of four scallop species with description of a new genus.”, Basteria vol. LII, p.41-42. The genus is named after « Mr. Cor Karnekamp, founder and promotor of the Malacologische Contactgroep Amsterdam. »
 

« I cannot find any subgeneric term that could exactly suit this magnificent group of Pecten. The idea came to me to name it after the vulgar name of “Pettini a mmanu” (hand-shaped comb) which is given to P. pes-felis by the fishermen of Palermo, because of the resemblance of its ribs and its general shape with the fingers and the elongated shape of the hand. » – T. A. di. Monterosato: “Coquilles marines marocaines”, Journal de Conchyliologie vol. XXXVII (1), p.21.
 

« The valves are both convex, but the left valve is more convex than the right, the auricles are unequal, the posterior being much smaller than the anterior. The byssal gape is deep and very strong, pectinidial teeth are present, a deeply furrowed fasciole occurring. The sculpture consists of closely scaled numerous radials flanked with subsidiary more delicate riblets, a deep gutter intervening between each group, which becomes filled up with such riblets as maturity is reached. The prodissoconch is smooth, with concentric growth lines, the succeeding sculpture being plain riblets with scratched intervals, the scales developing later. The sculpture on the two valves does not differ appreciably in design. » – T. Iredale: “Mollusca from the continental shelf of eastern Australia”, Records of the Australian Museum vol. XVII (4), p.163.
 

« Small species, pellucid, smooth or slightly imbricate with the interior devoid of radials. Generally included in Pseudamussium, Klein. » – T. A. di. Monterosato: Nomenclatura generica e specifica di alcune conchiglie mediterranee, Palermo 1884, p.5.
 

« Shell inequivalve, orbicular to oblique, usually small to circa 20mm, laterally compressed, lateral gape absent; left valve usually strongly sculptured with radial and/or concentric riblets or striae, right valve with concentric lamellae; auricles unequal; byssal notch well-developed, no ctenolium; internal lirae extend to submarginal or marginal region. » – H. H. Dijkstra: “Bathyal Pectinoidea from New Caledonia and adjacent areas”, Mémoires du Muséum national d’histoire naturelle vol.167, Paris 1995, p.25.
 

Shell often large, strong, « orbicular, nearly equilateral » (A. Rombouts: Guidebook to Pecten shells, Oegstgeest 1991), with a left valve flat or slightly concave. Ears large, of almost equal size.
 

Listed as a new genus by Mörch in his Catalogus conchyliorum fasc.2, Copenhagen 1853, p.59. The name, with two “s”, is based on a work by J. T. Klein, who described the genus Pseud-Amusium, with one “s”, as follows: « Bivalves with flat auricles, smoother than the Pectens, neither ribbed nor grooved, but with the most subtle radial striae. » – Tentamen methodi ostracologicae… Leiden 1753, §345. Large radial folds only. Synonym Peplum Bucquoy, Dautzenberg & Dollfus, 1889, who notice « The very small size of the auricles ». – Mollusques marins du Roussillon vol. II p.67.
 

Like Mimachlamys but « apparently never growing to a large size and being always less convex, with a more suppressed sculpture. » – T. Iredale: “Mollusca from the continental shelf of eastern Australia”, Records of the Australian Museum vol. XVII (4), p.164.
 

Shell medium-sized, flat, inequivalve, inequilateral, rounded to subtriangular. « Byssal notch rectangular. Left anterior auricle with 11-19 radial ribs; posterior auricle with 5-11 radial ribs. Disc sculptured with 8-14 paired plicae on right valve and 7-23 simple plicae on left valve, with numerous ribs and riblets bearing prominent scales. » – Santelli & del Río: “Neogene Pectinidae (Bivalvia) of tribe Chlamydini Teppner, 1922 in Patagonia (Argentina): Zygochlamys Ihering, 1907 and three new genera”, Journal of Paleontology vol.93(2), Cambridge 2018, p.5.