1990): Les Pectinidae
du Burdigalien terminal-Langhien de Tunisie: Donnees paleobiologiques et paleogeographiques.
Among other Pectinidae
species, the presence of a low frequency number of hermaphrodite scallops has been reported before, for example, for Placopeeten magellanicus (Gmelin, 1791) by Merrill and Burch (1960) and Worms and Davidson (1986), for Patinopecten yessoensis (Jay, 1857) by Yamamoto (1964, cited by Silina 2016) and Osanai (1975), for Patinopecten caurinus (Gould, 1850) by Hennick (1971), and for Chlamys nobilis (Reeve, 1852) by Komaru and Wada (1988).
Table 1 Summary of gill developmental sequence in Mytilus edulis and comparison with previous studies on bivalve gill development Family Mytilidae Pectinidae
Species Mytilus edulis Pecten maximus (a) (b) Gill type Primary condition Final condition homorhabdic Gill development Type Initial process First gill bud(s) < 0.
Rubber-like properties of the inner hinge-ligament of Pectinidae
We have showed that the prisms of the eupteriomorph families Pectinidae
, Propeamussiidae, Anomiidae, and Ostreidae are constituted internally by laths with arrow-pointed endings, which are morphologically indistinguishable from those of the foliated layer.
, energy can be obtained from an exogenous food supply, endogenous provision of stored reserves, or a combination of both strategies (Gabbot 1975, Bayne 1976, Barber & Blake 1991, 2006).
The earliest representative of Pectinidae
appeared in the Triassic period about 230 million years ago, but most groups did not emerge until the early Paleocene, or 65 million years ago (Waller, 1991).
For the functional hermaphrodite Pectinidae
, Barber and Blake (2006) reviewed macro- and microscopic indices of gonad maturity.
In the Bivalvia, the digestive and reproductive systems are closely situated and often intertwined, either within the visceral mass (the majority of bivalves), or more distinctly separated from the visceral mass, as in the Pectinidae
(Galtsoff, 1964; Morales-Alamo and Mann, 1989; Beninger and Le Pennec, 1991; Morse and Zardus, 1997).
These data make it possible to confirm that the homeodomain of the Gbx family was highly conserved among five distinct families of bivalve molluscs (Solenidae, Pectinidae
, Veneridae, Ostreidae, and Mytilidae), and the presence of Gbx genes in Mollusca, Annelida, Echiura, Echinodermata, and Arthropoda supports the idea that Gbx genes were already present in the last common ancestor of the deuterostomes and protostomes.
Rubber-like properties of the inner hingeligament of Pectinidae
The tree topologies based on 18S rDNA sequences [ILLUSTRATION FOR FIGURE 1-2 OMITTED] are consistent with the morphological taxonomy of Mytilidae, Pectinidae
, and Mactridae (Morton, 1996).
edulis), and approximately 10 times higher than larvae from the families Mytilidae, Veneridae, and Pectinidae
nodosus, es la especie de mayor tamano entre los representantes de la familia pectinidae
en el Caribe, alcanzando tallas normalmente comprendidas entre 120 y 150 mm, se encuentra frecuentemente en fondos arenosos con substratos duros, entre 5 y 15 m de profundidad.
edulis, which respectively represent the Pectinidae
and Mytilidae families of bivalves, suggest that the distribution of catecholamine-containing neurons may be generalized more widely across this taxon.