Jumping Spider - Hentzia palmarum
Class: Arachnida / Order: Araneae (Spiders) / Family: Salticidae (Jumping Spiders)

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Jumping Spider - Hentzia palmarum

Genus Hentzia is named for Nicholas Hentz (1797-1856), a French-born entomologist, engraver, and miniature painter, who spoke several languages and studied medicine in Paris and at Harvard. He also authored several school textbooks, a treatise on the American alligator, novels, and numerous articles. His posthumous Spiders of the United States, a collection of scholarly articles, paintings, and drawings on the subject, long remained a standard in the field of arachnology. [3]

Born in Versaille, France, Hentz fled with his family in 1816. He eventually settled in Philadelphia, where he became a member of The American Academy of Natural Sciences and remained one until his death in Florida in 1856. He illustrated numerous articles published in their Journal, and he named over 100 different species of spiders, mostly in Salticidae. [3]

Being one of the first scientists to study and illustrate spiders, Hentz was a friend of Charles Alexandre Lesueur (1778-1846), president of the Academy of Natural Sciences of Philadelphia, and of the American Geological Society. Hentz also developed a productive collaboration and lasting friendship with Thomas Say (1787-1834), the putative father of American entomology. Say was a taxonomist, as were most of the early entomologists, and he described considerably more than 1,000 new species of beetles and over 400 insects of other orders, including species in every important insect order. [4]

Say hoped Hentz would assist him in illustrating his own 3-volume American Entomology, or Descriptions of the Insects of North America, but distance prevented the successful conclusion of that project. [4]

There are only four Hentzia species in eastern North America, and outside of Florida and Southeastern Georgia, there are only two [1]: mitrata and palmarum:
H. mitrataH. palmarum
H. mitrata           Those long front legs are characteristic in the genus.        H. palmarum

Jumping Spider - Hentzia palmarum


 Jumping spider vision David Hill
Note: the function of the posterior medial eyes is unknown [2]

Jumping spiders are easily distinguished from other spiders by their four big eyes on the face and four smaller eyes on top of the head. The diagram above shows how the different focal lengths among the different eyes provide almost 360 degrees of coverage, while still allowing a field of very acute vision directly in front (like most predators). This explains why it is so difficult to sneak up on a jumping spider from behind; almost invariably, they will spot you and turn immediately in your direction.

References
  1. Bugguide.net, Jumping Spider - Hentzia palmarum
  2. Jumping Spider Vision David Edwin Hill, licensed under the Creative Commons Attribution 3.0 Unported license.

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