WebApr 11, 2024 · Anterior margin strongly unisulcate forming prominent flat-topped tongue. Ribs strong and rounded, simple with rare bifurcations and expanding towards anterior, numbering between 14–20, but usually 16–18. Fine growth lamellae on well-preserved specimens cover the shell. Ventral umbo strongly curved featuring prominent apical … WebUmbo A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvæ of echinoderms or in the tympanic membrane of the ear.; Umbo (Zoöl) One of the lateral prominences just above the hinge of a bivalve shell. Umbo The boss of a shield, at or near the middle, and usually projecting, …
What is the function of the umbo in clams? – ElegantQuestion.com
Web1 day ago · Combing the strandline in autumn often delivers a pocketful of cockles and other clam shells with a neat hole close to where the hinge would have been, in a thickened region of the shell called the umbo. The hole is a precision job – rounded, smooth and chamfered, with the size (up to 3mm) relating to that of the perpetrator. WebJan 26, 2001 · A bivalve is characterized by possessing two shells secreted by a mantle that extends in a sheet on either side of the body. The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell. The two shells are joined at the dorsal end by a region ... terence clifton prison
Experimental tests of bivalve shell shape reveal potential tradeoffs …
WebMay 31, 2024 · The shell grows comarginally around the post‑larval shell, which remains as a beak somewhere along the dorsal margin. The area surrounding the beak is known as … WebThe umbo (plural umbones or umbos) is the vaguely defined, often most prominent, highest part of each valve of the shell of a bivalve or univalve mollusc.It usually contains the valve's beak, the oldest point of the valve, and its degree of prominence and position relative to the hinge line are sometimes helpful in distinguishing bivalve taxa.The umbo forms while the … WebRising above the hinge line on each valve is a swelling called the umbo, the oldest part of the shell. The freshwater mussel Mytilopsis leucophaeata showing the incurrent and … triborough organic espresso blend