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25-43580. GNIS feature ID. 0618304. Website. www .nahant .org. Nahant ( / nəˈhɑːnt /) is a town in Essex County, Massachusetts, United States. The population was 3,334 at the 2020 census, which makes it the smallest municipality by population in Essex County. [1] With just 1.0 square mile (2.7 km 2) of land area, it is also the smallest ...
Hypostome (trilobite) A partially complete, forked, conterminant hypostome of the trilobite Isotelus ( Ordovician of southern Ohio). The hypostome is the hard mouthpart of trilobites found on the ventral side of the cephalon (head). The hypostome can be classified into three types based on whether they are permanently attached to the rostrum or ...
t. e. Buoyancy ( / ˈbɔɪənsi, ˈbuːjənsi / ), [ 1][ 2] or upthrust, is a gravitational force, a net upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus, the pressure at the bottom of a ...
Natantia. Natantia (Boas, 1880) is an obsolete taxon of decapod crustaceans, comprising those families that move predominantly by swimming – the shrimp (comprising Caridea and Procarididea ), prawns ( Dendrobranchiata) and boxer shrimp. The remaining Decapoda were placed in the Reptantia, and consisted of crabs, lobsters and other large ...
Librostoma. † Phacopida? [a] Librostoma is a subclass of trilobites defined by having a natant hypostome, which is a hypostome (mineralized trilobite mouthpart) that is free from the anterior doublure and aligned with the anterior of the glabella, [4] this is unlike a conterminant hypostome, which is attached to the exoskeleton.
Nekton. Nekton or necton (from the Greek: νηκτόν, translit. nekton, lit. "to swim") is an aquatic organism that can actively and persistently propel itself by swimming through a water column. Neckton, such as whales, squid and pelagic fish like tuna, can generally swim strongly enough to counter ocean currents .
In heraldry, the term attitudedescribes the positionin which a figure (animal or human) is emblazoned as a charge, a supporter, or as a crest. The attitude of a heraldic figure always precedes any reference to the tinctureof the figure and its parts. Some attitudes apply only to predatory beasts, exemplified by the beast most usual to heraldry ...
Salviniales are all aquatic and differ from all other ferns in being heterosporous, meaning that they produce two different types of spore (megaspores and microspores) that develop into two different types of gametophyte (female and male gametophytes, respectively), and in that their gametophytes are endosporic, meaning that they never grow ...