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Table 11
Differential
Morphology of the Diagnostic Stages of Helminths Found in
Humans: Tapeworm Scoleces
Species |
Size |
Shape |
Suckers No. |
Appearance |
Other |
| Taenia solium | Approximately 1 mm in diameter. | Globular or rounded. | 4 |
Cup-like. |
Double row of 25-30 large and small brown chitinous hooks arranged around a rostellum (small projection) at the top of the scolex. |
| Taenia saginata | 1 to 2 mm in diameter. | Rounded or slightly pyriform. | 4 |
Cup-like. |
Does not have a rostellum or hooks. |
| Diphyllobothrium latum | 2 to 3 mm in length × 1 mm wide. | Almond-shaped or spatulate. | 2 |
Grooves. |
Does not have a rostellum or hooks. Deep grooves (suckers) are located dorsally and centrally on the scolex, but often appear to be lateral. |
| Dipylidium caninum | 0.35 × 0.37 mm. | Rhomboid or rounded. | 4 |
Oval, cup-like. |
Prominent conical or ovoid rostellum with 30-150 small thorn-shaped hooks arranged in several rows (1-7 rows). Rostellum may be retracted into a depression at the upper margin of the scolex. |
| Hymenolepis nana | 0.3 mm in diameter. | Globular. | 4 |
Cup-like. |
Retractile rostellum with a single row of 20 to 30 hooks. |
| Hymenolepis diminuta | 0.2-0.4 mm in diameter. | Globular or club-shaped. | 4 |
Cup-like. |
Rudimentary apical rostellum without hooks. |
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