Entry Category: Science and Technology - Starting with S

Salmonids

aka: Trout
aka: Salmon
Salmonids include chars, graylings, salmon, trout, and freshwater whitefishes, all of which belong to the superorder Protacanthopterygii, order Salmoniformes, family Salmonidae, three lineages or subfamilies (Coregoninae, Thymallinae, and Salmoninae), eleven extant genera, and about 120 species. There are thirty-nine species known in North America. The family is widely distributed, with various species found north of the equator in Asia, Europe, and North America. Some important North American genera include Coregonus, Oncorhynchus, Prosopium, Salmo, Salvelinus, and Thymallus. Although no members are native to Arkansas, salmonids have been introduced, primarily for purposes of sports fishing. The family initially appears in the fossil record in the middle Eocene (48 to 38 million years ago) from fossils found in central British Columbia, Canada. A …

Schilberg, Richard

Richard Schilberg was an aviation pioneer whose early efforts in Stuttgart (Arkansas County) made him Arkansas’s first acknowledged aircraft manufacturer. Richard Schilberg was born on September 28, 1887, at Canada, Kansas, the son of Gottlieb Schilberg and Juliana Heidt Schilberg. He moved to Stuttgart in 1909 and opened a welding shop, initially specializing in agricultural machinery. He married Gladys Fricker on January 28, 1913. They divorced in 1926 and he married Mable Stilzen in 1927. The couple took their first airplane rides in June 1913, when one of Arkansas’s first aerial exhibitions came to the town. Increasingly interested in flying, he began building aircraft in Stuttgart by 1914, becoming the first major promoter of aviation in the Grand Prairie region. …

Science and Technology

Arkansas has had a rather conflicted relationship with science and technology throughout its history. On the one hand, the state existed for a long time on the American frontier, separated from the intellectual and academic centers of the rest of the nation; hence, its residents have been popularly perceived throughout history as possessing an anti-intellectual strain, an image on occasion reified during, for example, controversies regarding the place of evolutionary theory in public education. On the other hand, political leaders, and the people themselves, fairly readily support scientific research that promises to have an immediate economic benefit for the state of Arkansas. Given Arkansas’s place as a largely agricultural state, it is no surprise that much of this research has been …

Scorpionflies

aka: Mecopterans
Scorpionflies belong to the Phylum Arthropoda, Class Insecta, Superorder Endopterygota, and Order Mecoptera. There are about 605 species within thirty-four genera and nine families worldwide. There are also 400 known fossil species in about eighty-seven genera, which are more diverse than even the extant members of the order. Sixteen species representing three families of scorpionflies occur in Arkansas. Most mecopterans live in moist environments, although adults of a few species are found in hotter semi-desert habitats and may be active and noticeable only for short intervals of the year. Those in the family Panorpidae generally inhabit broad-leaf woodlands with abundant damp leaf litter. Snow scorpionflies (family Boreidae) appear in winter and are often seen on snowfields and on moss; the …

Sculpins

aka: Cottids
Sculpins belong to the order Scorpaeniformes and superfamily Cottoidea. There are about 11 families, 149 genera, and 756 species. They reach their maximum diversity in the northern Pacific Ocean. The family Cottidae is the largest family, with approximately 258 species; the second-largest family is the Agonidae (marine poachers), with 47 species. The most speciose genus, Cottus (freshwater sculpins), is confined to North America and Eurasia. It includes about 68 taxa that are native to the Northern Hemisphere (Palearctic and Nearctic realms). There is fossil material similar to Cottus that dates to at least the Miocene Epoch (23 to 5.3 million years ago). Most sculpins are generally less than 15 centimeters (6 inches) in length, although a few species can reach …

Shrews

Shrews are very small, secretive, mouse-like mammals that inhabit moist, shady woodland areas. Generally, they have long, flexible, pointed snouts and very small eyes and ears. Their fur is soft and dense, and most species have prominent scent glands. All shrews belong to the Family Soricidae (subfamilies Soricinae, Crocidurinae, Myosoricinae) and Order Eulipotyphia, which also includes moles, shrew-like moles, desmans, gymnures, hedgehogs, and solenodons. True shrews, talpids, and solenodons were formerly grouped in the clade Soricomorpha; however, Soricomorpha has been found to be paraphyletic (descended from a common evolutionary ancestor or ancestral group, but not including all descendant groups). Members of this order are nearly cosmopolitan in distribution, with the exception of Australia, New Zealand, Antarctica, extreme southern South America, …

Shrimps

aka: Prawns
Arkansas shrimps belong in the cosmopolitan Family Palaemonidae (subfamily Palaemoninae) and Order Decapoda, which also contains the crayfishes. Taxonomically, shrimps are differentiated from crayfishes by their first pair of legs with chelae and the abdomen laterally compressed, while crayfishes have the first three pairs of legs with chelae and their abdomens dorsoventrally flattened. The Palaemonidae is a large family (950 species within 137 genera) and is distributed on all the continents except in the deep oceans, in temperate and tropical regions, and having representatives in marine, brackish, and fresh water. Representatives of this family are mainly carnivores that feed on small invertebrates. The most prominent genus in the family is Macrobrachium, with over 240 species that include commercially fished species; …

Shrubs

In 2016, a total of 436 kinds of woody plants were known to occur in the wild in Arkansas, comprising 419 species plus another seventeen varieties and subspecies. Of these, 185 can be considered trees, 189 are best described as shrubs, and sixty-two are woody vines. In some cases it is difficult to draw a hard line between these categories, and various references differ in their criteria for each. For the purposes of this entry, however, each category is defined as follows: Trees are defined as perennial, often single- or relatively few–stemmed woody plants typically greater than five meters (sixteen feet) in height at maturity. Shrubs are defined as perennial, often multi-stemmed woody or semi-woody plants usually less than five …

Silitch, Mary Frances

Mary Frances Files Silitch is the first woman to be editor-in-chief of a national aviation magazine. A licensed pilot, she has flown 250 kinds of aircraft and logged 5,000 hours of flight. Mary Frances Files was born on November 9, 1935, in Little Rock (Pulaski County) to William Thomas Files and Johnnie Caldwell Files of Parkdale (Ashley County); she has two sisters. Her first flight was in an open-cockpit crop-duster airplane over the family farm at the age of four. She attended schools in Parkdale and Wilmot (Ashley County) but graduated from All Saints Episcopal School in Vicksburg, Mississippi. She attended Southwestern at Memphis (now Rhodes College), where she began her journalism career as the managing editor of the Sou’wester, …

Silverfish

aka: Bristletails
Silverfish are small, wingless insects in the order Zygentoma (formerly Thysanura). There are four families: Lepidotrichidae (single species), Lepismatidae (about 200 species), Maindroniidae (three species), and Nicoletiidae (about twenty species). In the late twentieth century, it was recognized that the two suborders were not sister taxa; therefore Thysanura was paraphyletic, and the two suborders were each elevated to the status of an independent monophyletic order, with Archaeognatha the sister taxon to the Dicondylia, including the Zygentoma (fishmoths, firebrats, and silverfish). A nicoletiid, Speleonycta ozarkensis, occurs in eight different cave systems in Arkansas in Benton and Newton counties and in Oklahoma in Adair, Cherokee, and Delaware counties. In concert with jumping bristletails (Order Microcoryphia), the predecessors of silverfish are considered the …

Slime Molds

Slime molds are among the more interesting yet relatively little known organisms found in Arkansas. They do not have a particularly attractive name, but some examples produce fruiting bodies that are miniature objects of considerable beauty. The organisms commonly referred to as slime molds actually belong to two different taxonomic groups—the myxomycetes and the dictyostelids. Members of both groups are common-to-abundant organisms in forests throughout Arkansas, but only the myxomycetes (also called plasmodial slime molds) can be observed directly in nature. As a result, the myxomycetes are by far the better known group, and to most people (including many biologists), they are the only “slime molds” of which they are aware. However, the dictyostelids (also known as cellular slime molds) …

Smelts

aka: Osmerids
Smelts belong to the family Osmeridae and order Salmoniformes. There are seven genera and about eleven species. Fishes of the genus Osmerus, to which the rainbow smelt (O. mordax) belongs, include the following: a North Pacific and Arctic species, O. dentex; the European smelt (O. eperlanus) of the Eastern North Atlantic; and the landlocked pygmy smelt (O. spectrum) of eastern Canada and New England, which some authorities suggest is not a valid species. In general, smelts are north circumpolar in geographic distribution, and they occur in marine and freshwater habitats in Asia, Europe, and North America. They date to the Paleocene Epoch (over 55 million years ago). The closest relatives are galaxioid (Protacanthopterygiid) fishes, and the marine argentinoid fishes are …

Snake Fungal Disease

aka: Ophidiomycosis
Snake fungal disease (ophidiomycosis) is an emerging infectious disease of numerous species of snakes caused by the fungus Ophidiomyces ophiodiicola within the family Onygenacea. Formerly, Ophidiomyces was classified as the Chrysoporium anamorph of Nannizziopsis vriesii species complex (CANV species complex), a group of fungi that are frequently associated with emerging infections in various groups of reptiles. However, recent phylogenetic analyses have demonstrated that CANV represents a species complex that also includes fungi of the genera Nannizziopsis and Paranannizziopsis and that Ophidiomyces is known to occur only on both colubrid and viperid snakes. It was first definitively identified in 2006 in a population of timber rattlesnakes (Crotalus horridus) in New Hampshire. However, although identification has not been conclusively proven because cultures …

Sneed Tornado of 1929

aka: Tornado Outbreak of April 10, 1929
The only F5 tornado ever recorded in Arkansas destroyed the Sneed and Pleasant Valley communities in Jackson County on April 10, 1929, one of a series of twisters on that day that claimed at least fifty-four lives in the state. At least eight tornadoes hit northeastern Arkansas on April 10, 1929. The most powerful, with wind speeds of 261 to 318 miles per hour, formed near Batesville (Independence County) and traveled northeast, entering Jackson County at about 6:15 p.m., with a half-mile-wide path. As it approached Pleasant Valley (also known as Possum Trot) north of Swifton (Jackson County), people sought shelter in homes that were quickly destroyed by the tornado “dipping down into the farm communities as if a gigantic …

Solar Eclipse of 1834

A total solar eclipse is a phenomenon in which the moon totally obscures the bright light of the sun, leaving only the faint corona visible. Some residents of Arkansas Territory and some states in the South could see such an eclipse on November 30, 1834. The Arkansas Gazette announced the impending event in December 1833 by running an excerpt from the American Almanac stating that “the most remarkable of the phenomena that this year will happen, is the eclipse of the sun on Sunday, the 30th of November,” being total “in a small part of the territory of Arkansas” and in the states of Mississippi, Alabama, Georgia, and South Carolina. The article noted that “a great depression of the thermometer, …

Solar Eclipse of 1918

The second of two recorded total solar eclipses—in which the moon totally obscures the sun, leaving only the corona visible—that could be seen in Arkansas occurred on June 8, 1918. While the first, in 1834, was clearly observed as a “magnificent phenomenon of nature in all its sublimity,” the 1918 event was reported as “somewhat of a disappointment.” On January 3, 1918, the Arkansas Gazette announced that June 8, 1918, would be “a gala day for astronomers,” as a total solar eclipse would cross the United States, beginning in northern Oregon and traveling to northern Florida “at a speed of something like 1,000 miles an hour.” The Hot Springs New Era noted a few weeks later that Mount Ida (Montgomery …

Southern Cavefish

aka: Typhlichthys subterraneus
The southern cavefish (Typhlichthys subterraneus) is one of the two species of blind cave fishes found in Arkansas. The other is the Ozark cavefish. The southern cavefish is found in the subterranean waters of two major non-overlapping ranges separated by the Mississippi River: in the Ozark Plateau of central and southeastern Missouri and northeastern Arkansas and in the Cumberland and Interior Low plateaus of northwest Alabama, northwest Georgia, central Tennessee, and Kentucky. They are usually found at considerable depths (mostly between 175 and 240 meters below the land surface). This species, which can grow as long as ninety millimeters, has a large, broad head. The caudal fin has from zero to two rows of sensory papillae (one on the upper …

Speckled Pocketbook

aka: Lampsilis streckeri
The speckled pocketbook is a bivalve mollusk belonging to the family Unionidae, commonly referred to as freshwater mussels, naiads, or clams. Each freshwater mussel is composed to two halves (valves) of a hard outer shell with the living animal (soft tissues) residing securely inside. The speckled pocketbook, scientific name Lampsilis streckeri, was described as a species new to science in 1927 by Lorraine Screven Frierson, a naturalist and landowner/merchant/planter residing south of Shreveport in the company town of Frierson, Louisiana. Frierson named the species in honor of his friend, colleague, and fellow naturalist John K. Strecker of Waco, Texas. Adults may reach a length of slightly more than 3.5 inches (or more than 90 millimeters), with a maximum life expectancy …

Sponges

The phylum Porifera, which contains the sponges, is a highly successful group of metazoan animals that includes about 8,600 living species of marine and freshwater forms as well as some that inhabit brackish waters. The majority are marine, but there are about 150 species of freshwater sponges, including twenty-seven to thirty species found in North America north of Mexico. The family Spongillidae is the most speciose and widespread group of freshwater sponges and includes twenty-two genera and more than 130 species from a wide variety of habitats. Seven species of freshwater sponges have been documented in Arkansas. Sponges are an ancient group of asymmetrical invertebrates with a fossil record preceding the early Cambrian period (541 million years ago), and even …

Stern’s Medlar

aka: Crataegus × Canescens
aka: Mespilus canescens
Stern’s medlar (Mespilus canescens or Crataegus × canescens) is a rare shrub in the rose family known in the wild from about twenty-five individual plants at a single site near Slovak (Prairie County). It was first discovered in 1969 by Jane Stern but was not named until 1990, when it was formally described (as Mespilus canescens) by Dr. James Phipps of the University of Western Ontario. Its origin, taxonomic placement, and proper scientific name are a matter of debate among botanists and represent one of the most curious and persistent mysteries in North American botany. Stern’s medlar is a showy species with a number of desirable ornamental properties including dense groupings of quarter-sized white flowers, multiple trunks, arching branches, patchy …