Wednesday, March 18, 2020

The 13 Forms of Insect Antennae

The 13 Forms of Insect Antennae Antennae are movable sensory organs located on the head of most arthropods. All insects have a pair of antennae, but spiders have none. Insect antennae are segmented, and usually located above or between the eyes. How Do Insects Use Antennae? Antennae serve different sensory functions for different insects. In general, the antennae might be used to detect odors and tastes, wind speed and direction, heat and moisture, and even touch. A few insects have auditory insects on their antennae, so theyre involved in hearing.  In some insects, the antennae may even serve a non-sensory function, such as grasping prey. 13 Different Shapes Because antennae serve different functions, their forms vary greatly within the insect world. In all, there are about 13 different antennae shapes, and the form of an insects antennae may be an important key to its identification. Learn to differentiate the forms of insect antennae, and it will help you improve your insect identification skills. Aristate Are Pouch-Like Aristate antennae are pouch-like, with a lateral bristle. Aristate antennae are most notably found in the Diptera (true flies). Capitate Have a Prominent Club or Knob at Their Ends Capitate antennae have a prominent club or knob at their ends. The term capitate derives from the Latin caput, meaning head. Butterflies (Lepidoptera)  often have capitate form antennae. Clavate Have a Gradual Club or Knob The term clavate comes from the Latin  clava, meaning club. Clavate antennae terminate in a gradual club or knob (unlike the capitate antennae, which end with an abrupt, pronounced knob). This antennae form is found most often in beetles, such as in carrion beetles. Filiform Are Slender and Thread-Like The term filiform comes from the Latin filum, meaning thread. Filiform antennae are slender and thread-like in form. Because the segments are of uniform widths, there is no taper to filiform antennae. Examples of insects with filiform antennae include: rock crawlers (order Grylloblattodea)gladiators (order Mantophasmatodea)angel insects (order Zoraptera)cockroaches (order Blattodea) Flabellate Look Like a Folding Paper Fan Flabellate  comes from the Latin flabellum, meaning fan. In flabellate antennae, the terminal segments extend laterally, with long, parallel lobes that lie flat against one another. This feature looks like a folding paper fan. Flabellate (or flabelliform) antennae are found in several insect groups within the Coleoptera, the Hymenoptera, and the Lepidoptera. Geniculate Are Bent or Hinged Sharply Geniculate antennae are bent or hinged sharply, almost like a knee or elbow joint. The term geniculate derives from the Latin genu, meaning knee. Geniculate antennae are found mainly in ants or bees. Lamellate Are Flattened and Nested The term lamellate comes from the Latin lamella, meaning a thin plate or scale. In lamellate antennae, the segments at the tip are flattened and nested, so they look like a folding fan. To see an example of lamellate antennae, look at a scarab beetle. Monofiliform Look Like Strings of Beads Monofiliform comes from the Latin monile, meaning necklace. Moniliform antennae look like strings of beads. The segments are usually spherical, and uniform in size. The termites (order Isoptera) are a good example of insects with moniliform antennae. Pectinate Have a Comb-Like Shape The segments of pectinate antennae are longer on one side, giving each antennae a comb-like shape. Bipectinate antennae look like two-sided combs. The term pectinate derives from the Latin pectin, meaning comb. Pectinate antennae are found mainly in some beetles and sawflies. Plumose Have  a Feathery Appearance The segments of plumose antennae have fine branches, giving them a feathery appearance. The term plumose derives from the Latin pluma, meaning feather. Insects with plumose antennae include some of the true flies, such as mosquitoes, and moths. Serrate Look Like a Saw Blade The segments of serrate antennae are notched or angled on one side, making the antennae look like a saw blade. The term serrate derives from the Latin serra, meaning saw. Serrate antennae are found in some beetles. Setaceous Are Bristle-Shaped The term setaceous comes from the Latin seta, meaning bristle. Setaceous antennae are bristles of insects with setaceous antennae include mayflies (order Ephemeroptera) and dragonflies and damselflies (order Odonata). Stylate Terminate in a Long, Slender Point Stylate  comes from the Latin  stylus, meaning pointed instrument. In stylate antennae, the final segment terminates in a long, slender point, called a style. The style may be hairlike but will extend from the end and never from the side. Stylate antennae are found most notably in certain true flies of the suborder Brachycera (such as robber flies, snipe flies, and bee flies). Source: Triplehorn, Charles A. and Johnson, Norman F. Borror and DeLongs Introduction to the Study of Insects. 7th Edition

Sunday, March 1, 2020

African American History and Women Timeline

African American History and Women Timeline What have African American women contributed to American history? How have they been affected by historical events? Find out in the timeline, which includes these: events featuring African American womenbirth and death dates for many notable African American womengeneral African American events which had significant impact on African American women and families as well as menevents involving key women whose work influenced African American history, for instance the involvement of many European American women in anti-slavery workbirth and death dates for key women whose work was important in African American history, for instance in anti-slavery or civil rights work Start with the timeline period youre most interested in: [1492-1699]  [1700-1799] [1800-1859] [1860-1869] [1870-1899] [1900-1919] [1920-1929] [1930-1939] [1940-1949] [1950-1959] [1960-1969] [1970-1979] [1980-1989] [1990-1999] [2000-] Women and African American History: 1492-1699 1492 Columbus discovered America, from the perspective of Europeans. Queen Isabella of Spain declared all indigenous peoples her subjects, in the lands claimed by Columbus for Spain, preventing the Spanish conquerors from enslaving the Native Americans. The Spanish thus looked elsewhere for the labor they needed to take advantage of the New Worlds economic opportunities. 1501 Spain permitted African slaves to be sent to the Americas 1511 first African slaves arrived in Hispaniola 1598 Isabel de Olvero, part of the Juan Guerra de Pesa Expedition, helped to colonize what has since become New Mexico 1619 (August 20) 20 men and women from Africa arrived on a slave ship and were sold in the first North American slave auction by British and international custom, Africans could be held in servitude for life, though white Christian indentured servants could only be held for a limited term 1622 Anthony Johnson, son of an African mother, arrived in Virginia. He lived with his wife, Mary Johnson, in Accomack on Virginias Eastern Shore, the first free Negroes in Virginia (Anthony taking his last name from his original master). Anthony and Mary Johnson eventually founded the first free black community in North America, and themselves held servants for life. 1624 Virginia census lists 23 Negroes including some women; ten have no names listed and the rest only first names, likely indicating lifetime servitude none of the women are listed as married 1625 Virginia census lists twelve black men and eleven black women; most have no names and do not have the dates of arrival that most white servants in the census have listed only one of the black men and women has a full name listed 1641 Massachusetts legalized slavery, specifying that a child inherited its status from the mother, rather than the father, reversing English common law about 1648 Tituba born (Salem witch trials figure; probably of Carib not African heritage) 1656 Elizabeth Key, whose mother was a slave and father was a white planter, sued for her freedom, claiming her fathers free status and her baptism as grounds and the courts upheld her claim 1657 A daughter of a free Negro Anthony Johnson, Jone Johnson, was given 100 acres of land by Debeada, an Indian ruler. 1661 Maryland  passed a law making every person of African descent in the colony a slave, including all children of African descent at birth whatever the free or enslaved status of the childs parents. 1662 Virginia House of Burgesses passed a law that a childs status followed the mothers, if the mother was not white, contrary to English common law in which the fathers status determined the childs 1663 Maryland passed a law under which free white women would lose their freedom if they married a black slave, and under which the children of white women and black men became slaves 1664 Maryland became the first of the future states to pass a law making it illegal for free English women to marry Negro slaves 1667 Virginia passed a law stating that baptism  could not free slaves by birth 1668 Virginia legislature declared that free black women were to be taxed, but not white women servants or other white women; that negro women, though permitted to enjoy their freedome could not have the rights of the English. 1670 Virginia passed a law that Negroes or Indians, even those free and baptized, could not purchase any Christians, but could purchase any of their owne nation [race] (i.e. free Africans could buy Africans and Indians could buy Indians) 1688 Aphra Behn (1640-1689, England) published the anti-slavery Oroonoka, or the History of the Royal Slave, first novel in English by a woman 1691 The term white is first used, rather than specific terms like English or Dutchman, in a law referring to English or other white women. 1692 Tituba disappeared from history (Salem witch trials figure; probably of Carib not African heritage) [Next] [1492-1699] [1700-1799] [1800-1859] [1860-1869] [1870-1899] [1900-1919] [1920-1929] [1930-1939] [1940-1949] [1950-1959] [1960-1969] [1970-1979] [1980-1989] [1990-1999] [2000-]