Parvamussium fenestratum (Forbes, 1844)
FORBES, E. 1844. Report on the Mollusca and Radiata of the Aegean Sea, and on their distribution, considered as bearing on Geology. Report of the thisteenth meeting of the British Association for the Advancment of Science; held at Cork in August 1883, p.130-193. John Murray, London. [p. 192]
1844 Pecten fenestratus Forbes, 1844
1844 Pecten concentricus Forbes, 1844
1855 Pecten philippii Acton, 1855
1856 Pecten inaequisculptus Tiberi, 1856
1856 Pecten actoni Martens, 1856
1885 Pecten gallimus Gregorio, 1885
1898 Amussium [sic] fenestratum var. depressa Locard, 1898
1844 Pecten concentricus Forbes, 1844
1855 Pecten philippii Acton, 1855
1856 Pecten inaequisculptus Tiberi, 1856
1856 Pecten actoni Martens, 1856
1885 Pecten gallimus Gregorio, 1885
1898 Amussium [sic] fenestratum var. depressa Locard, 1898
Parvamussium fenestratum (Forbes, 1844); H. H. Dijkstra & S. Gofas, 2004, Pectinoidea (Bivalvia: Propeamussiidae and Pectinidae) from some northeastern Atlantic seamounts, figures 4A-4H.
|
«P. testâ minutâ (aequivalvi), orbiculari, costis (5) longitudinalibus, striis (10—15) transversis, interstitiis minutissimè longitudinaliter striatis; auriculis aequalibus, magnis, longitudinaliter striatis.
Lat. O2/12. Region VIII. Cyclades, Asia Minor.» EDWARD FORBES, 1844
|
«Stratigraphic range and geographic distribution. – Early Miocene to Recent; previous fossil records are restricted to the Mediterranean. This extraordinarily rare species has been reported in the Lower Miocene only from Burdigalian strata, at Sciolze, Italy (Sacco, 1897). Its occurrence in the Pliocene has been confirmed in the Estapona Basin, Spain by Vera-Peláez et al. (1995) and Lozano-Francisco (1997, 1998). It is note worthy that through the Mediterranean the present-day P. fenestratum seems to be scarce (Smriglio and Mariottini, 1990; Poppe and Goto, 1993). Recently, living specimens have been found only in a few localities on the muddy bottoms around the scleractinian coral banks at 530 m depth in the Ionian Sea off Apulia, Italy (Mastrototaro et al., 2010) and its presence off Capo Corso in the Corsica from 300 m depth was com municated to the senior author by B. Dell’Angelo in 2011. On the other hand, modern P. fenestratum is wide spread through out the northeastern Atlantic and is distributed from Iceland along the British Isles, on the Galician Bank, on the Lusitanian seamounts, south to Portugal, the Azores, Madeira, Canary Islands and the Cape Verde Islands (Poppe and Goto, 1993; Dijkstra and Goud, 2002; Dijkstra and Gofas, 2004; Dijkstra et al., 2009)
STUDENCKA, B., V. A. PRYSYAZHNYUK & S.A. LJUL’EVA. 2012. First record of the bivalve species Parvamussium fenestratum (Forbes, 1844) from the Middel Miocene of the Paratethys. Geological Quarterly, 56 (3): 513-528, figs. 1-5. [p. 518]
|
Parvamussium fenestratum (Forbes, 1844); B. Studencka, V. A. Prysyazhnyuk & S.A. Ljul’eva, 2012, First record of the bivalve species Parvamussium fenestratum (Forbes, 1844) from the Middel Miocene of the Paratethys, figure 3.
|
«Distribution.— Temperate to tropical eastern Atlantic (50"N-14'N), bathymetric range from 99 m (present data) to 1193 m (Schein, 1989: 87). Depth range of present material 99-1085 m. One sample from Madeira ( L.D47) was collected by scuba-diving at 0-20 m. Shells of P. fenestratum from this depth are probably transported and distributed by an upwelling current.
Description.— Shell up to c. 7 mm in height, fragile, semitransparent, subcircular, inequivalve, nearly equilateral. Auricles unequal in size. Prodissoconch c. 180-200 m. Left valve sculptured with irregularly spaced, radial lirae and prominent overrunning commarginal lamellae. Auricles more weakly sculptured and somewhat reticulated. Right valve with closely spaced, regularly arranged commarginal lamellae or lirae; marginal apron pressed to the left valve. Auricles weakly sculptured with radial and commarginal striae. Hinge line straight; dorsal margin weakly denticulated. Internally 14-20 radial ribs, commencing in late growth stage and extending to semiventral margin. Byssal notch well developed; no ctenolium. Left valve creamy and maculated with white and brown dots, sometimes more monochrome milky white. Right valve less maculated and more opaque.
Remarks.— The sculpture of the left valve and the internal ribs (length and number) are rather variable in the present species. Sometimes the reticulated sculpture of the Ieft valve is absent on the central part of the disc. Juvenile specimens are lacking the internal ribs.
Previous records of P. fenestratum, from the tropical western Atlantic are Parvamussium thalassinum (Dall, 1886). Records of P. lucidum from Capraia Islands (Terreni, 1980; 1981) are probably weak sculptured specimens of P. fenestratum. Conchological characters of Cyclopecten brundisiensis Smriglio & Mariottini, 1990 from off Brindisi (S Adriatic Sea) are somewhat similar to those of juvenile P. fenestratum. The present species is placed by previous authors in different genera of Pectinidae, but P. fenestratum is in all aspects a propeamussiid. Morphological characters of P. fenestratum (unequal auricles, byssal notch well developed, internal ribs commence in late ontogeny, no ctenolium) justify placement in Parvamussium.» DIJKSTRA, H. H. & J. GOUD. 2002. Pectinoidea (Bivalvia, Propeamusidae & Pectinidae) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern region of the North Atlantic Ocean. CANCAP-Project contribution Nº 127. Basteria, 66: 31-81, figs. 1-77. [p. 36-38]
|
Parvamussium fenestratum (Forbes, 1844); H. H. Dijkstra & J. Goud, 2002, Pectinoidea collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern region of the North Atlantic Ocean, figures 5-10.
|