[Elizabeth_Zeibig]_Clinical_Parasitology__A_Practi(z-lib.org)

CHAPTER 13 The Arthropods
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is not readily available and treatment primarily
consists of palliative care, pain management, and
general wound care until the site heals. Occasionally,
surgical intervention may be needed for
débridement of necrotic tissue. Bites by the hobo
spider usually only require simple wound care to
prevent secondary bacterial infections.
Prevention and Control
Prevention of venomous spider bites is a matter
of minimizing places where they can hide and
breed, as well as exercising caution when dealing
with potential exposure locations (e.g., wood
piles). Pesticides can be used around dwellings
but are not always effective. Sealing holes in
exterior walls where plumbing pipes and electrical
wires enter a home is essential for preventing
their access to inside living spaces. Minimizing
clutter outside but adjacent to the home will
minimize their tendency to build webs close by.
Quick Quiz! 13-10
Which type of spider is noted for its tendency to
remain out of plain sight? (Objective 13-5)
A. Brown recluse
B. Hobo
C. Black widow
Quick Quiz! 13-11
The most venomous spider in North America is which
of the following? (Objective 13-5)
A. Brown recluse
B. Hobo
C. Black widow
Quick Quiz! 13-12
Antivenin is a possible treatment for older adults
who have encountered which of these spider(s)?
(Objective 13-10)
A. Brown recluse
B. Hobo
C. Black widow
D. More than one: __________ (specify)
TABLE 13-4
Parameter
Body
Legs
Scorpions
Morphology
Scorpions have a distinctive body shape, with a
combined cephalothorax and an elongated abdominal
section that ends in an up-curved tail (Fig.
13-7; Table 13-4). Adults may reach 4 inches in
length. The final segment in the tail contains a
stinger and venom sac. Like all arachnids, scorpions
have four pairs of legs, but their first set is
enlarged, with clawlike pincers to hold prey.
Life Cycle notes
FIGURE 13-7 Adult scorpion.
Adult Scorpions: Typical
Features at a Glance
Description
Combined cephalothorax and
elongated abdominal section that
ends in up-curved tail
Final segment in tail contains stinger
and venom sac
Four pairs; first set is enlarged, with
clawlike pincers to hold prey
Like spiders, young scorpions are simply smaller
versions of the adult. Young develop in the
female’s ovariuterus. After birth, the brood rides
on the mother’s back until the first molting, at
approximately 2 weeks of age. They do not
change morphology but undergo six moltings,
increasing in size with each molt. The life span
varies by species from 4 to 25 years.