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Lab Twelve: Phylum Arthropoda

(please see previous labs below)

*in all Lab photos: 1 unit = 1 µm (unless otherwise indicated)

Phthirus pubis (= crab or pubic louse) is a parasitic insect (O. Anoplura) infecting humans.

Pediculus humanus corporis (left) and Pediculus humanus capitis (right) are parasitic insects (O. Anoplura) infecting humans.

Amblyomma americanum, the lonestar tick, is a parasitic arachnid (O. Ixiodida) that transmits Rocky Mountain Spotted fever.

Dermacentor variabilis, the American dog tick, is a parasitic arachnid (O. Ixiodida) that transmits Rocky Mountain Spotted fever.

Pulex irritans, the human flea, is a parasitic insect (O. Siphonaptera) that transmits plague.
Sarcoptes scabiei, the itch mite, is a parasitic arachnid (O. Astigmata) that causes sarcoptic mange, or scabies.


Flea Key
Tick Key
Lab Ten: Phylum Nematoda

*in all Lab photos: 1 unit = 1 µm (unless otherwise indicated)

Ascaris lumbricoides egg
Enterobius vermicularis egg

Trichuris trichiura egg
Necator americanus egg

Necator americanus anterior end, and close-ups of the mouth with characteristic broad cutting plates (left).
Female (top, right) posterior end. Male bursa (bottom) with fused spicules.

Ancylostoma duodenale mouth with ventral teeth (left, top), and male copulatory bursa with spicules (left, bottom).

Enterobius vermicularis adult female whole mount (left); with details of anterior (top center) and posterior (bottom center).
Enterobius vermicularis adult male whole mount (top right); with detail of posterior (bottom right).

Ascaris sp. anterior end with lips (left), Ascaris sp. (center), and Trichurus trichuria whole mount female (right).
Lab Nine: Class Cestoidea - Tapeworms

Diphillobothrium latum egg entire, and with opened operculum (left). Taenia saginata egg (right), both from human fecal smears.

A pseudophyllidean Tapeworm: Taenia pisiformis whole mount.

A pseudophyllidean Tapeworm: Diphyllobothrium latum scolex (top) and mature proglottids (below) from a whole mount.

A cyclophyllidean Tapeworm: Hymenolepis diminuta adult tapeworm from a rat (left) and cysterceroid life stage from a beetle (right).
Detail of proglottid with reproductive structures

Echinococcus granulosus scolex (top) and whole mount of the adult tapeworm with a single mature proglottid (bottom).
Faith is taking the first step even when you don't see the whole staircase. Martin Luther King, Jr
Alaine Knipes : PhD Candidate : School of Biological Sciences : University of Nebraska-Lincoln, NE 68588
Phone: (402) 472-2754 email