To title page of Tertiary Marine Pelecypods of California and Baja California
[Please cite as follows: Moore, E.J., 2002, Family Mesodesmatidae, in Tertiary marine pelecypods of California and Baja California, Chapter F: http://www.cmug.comt/~chintimp/Mesodesmatidae.htm, 2 p., 1 pl.]
Family MESODESMATIDAE
Genus MYADESMA Clark, 1922
"Posterior end short, beaks opisthogyrate; resilifers directed anteriorly, large in LV, sunken in RV; pallial sinus small, broad." (Moore, 1969, p. N610)
Geographic range.--Western North America.
Geologic range.--Eocene to Miocene.
Comments.--In The Treatise (Moore, 1969, p. N610) this genus is cited as ?Myadesma.
Genus MYADESMA?
Myadesma? eocenica Clark
Plate 12, figure 8; Plate 12; Plate 12 caption
Myadesma eocenica Clark, 1938, p. 698-699, pl. 1, figs. 14, 26, 27, 29.
Original description.--"Shell elongate, subtrapezoidal in outline; beaks inconspicuous, near the posterior end which is bluntly rounded; anterior end broadly and regularly rounded; a well-developed ridge reaches from the beaks to the ventral side of the short, rounded posterior end; the surface between this ridge and the posterior edge slopes abruptly away from the main surface; surface smooth except for the somewhat irregular lines of growth. Hinge plate of left valve with a spatulate chondrophore, the upper surface of which is concave; posterior to this is a bluntly rounded, heavy, fairly long cardinal tooth."
Holotype .--UCMP 30836. According to Keen and Bentson (1944, p. 71) the holotype is missing. Paratypes: UCMP 30837, 30838.
Type locality.--UC A-1297. Solano County, Calif. Markley Formation, Eocene.
Occurrence in California.--Eocene: Markley Formation (Clark, 1938).
Myadesma? pacifica (Hall and Ambrose)
Mesodesma pacifica Hall and Ambrose, 1916, p. 79.
Myadesma pacifica (Hall and Ambrose). Clark, 1922, p. 118, pl. 13, fig. 5.
Original description.--"Right valve. Cast. Shell subtrigonal, inequilateral. Beak small. Posterior end truncate, at extremity making angle of 133 [degrees] at beak between posterior dorsal margin and anterior dorsal margin, anterior margin straight, abruptly truncated at end, deep furrow cutting at angle of 25 [degrees] to anterior dorsal margin from beak, gradually disappearing until obscure at center of valve."
Holotype.--CAS/SU 513.
Type locality.--SU C-209. Pleasanton Quad., Alameda County, Calif. Briones Sandstone, San Pablo Group, Miocene.
Occurrence in California.--Miocene: Briones Sandstone, San Pablo Group (Keen and Bentson, 1944) and Monterey Formation (Clark, 1922).
[Last updated June 26, 2002.]
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