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Animals—Living, Invertebrates, continued
Planaria
The common freshwater representative of the phylum Platyhelminthes—
the flatworms.
The phylum also includes the medically important parasitic tapeworms and
flukes. The flatworms are of anatomical interest for two primary reasons—the development
of three distinct germ layers (ectoderm, endoderm, and mesoderm), and
as examples of the acoelomates (animals lacking a body cavity). Planaria has been
widely studied for its regenerative capacity, its response to basic stimuli, and for
simple learning experiments. A state permit is required to ship to Alaska and Hawaii.
★MAINTENANCE: Maintain Planaria in dim, diffuse light at 20 to 22 °C, in a shallow tray or culture
dish. Culture in filtered pond or spring water. Feed once a week with pea-sized portions (one piece per
50 Planarians) of fresh beef liver or hard-boiled egg yolk. Remove uneaten food after one or two hours.
Catalog No. Description Pkg. Size Price/Pkg.
LM1094 Brown Planaria (Dugesia tigrina). Hardier and more
durable. This is the species for any manipulative study—
regenerational or behavioral.
30 $10.35
LM1095 100 32.05
LM1096 Black Planaria (Dugesia dorotocephala). Offered for interspecific
comparison with its brown congener. Large and
30 15.00
LM1097 100 40.70
LM1098 Mixed Planaria. A single culture of both species. A convenient
option if comparative studies will be performed.
30 15.40
ANIMALS continued on next page.
© T.E. Adams/Visuals Unlimited
Rotifers
LM1099, etc.
darkly pigmented.
Rotifers
Also known as “wheel animalcules” because of the ring of cilia surrounding the
mouth. Common inhabitants of fresh water from lakes, ditches and puddles.
Transparent, so that internal anatomy can be examined in the living organism,
several species have rings in their outer body covering giving the false impression
of being segmented. Hardy and active, they are fascinating to observe.
★MAINTENANCE: Maintain Rotifers in culture dishes, in moderate light at room temperature.
Culture in wheat seed infusion medium which has been prepared and left uncovered 48–72 hours.
Supplement with a green algae, such as Chlorella or Chlamydomonas.
Catalog No. Description Pkg. Size Price/Pkg.
LM1099 Mixed Rotifers. Several freshwater species
in a single culture.
30 $10.30
LM1100 100 28.40
Planaria
LM1094, etc.
© Neo Sci
Hydra
This widely distributed genus can be used to demonstrate several important
concepts and processes as well as its own intriguing habits. A freshwater cnidarian,
Hydra is by far the most easily cultured and studied member of the phylum. Daphnia
can be used as food to observe the prey capture behavior of Hydra which uses its
nematocyst-laden tentacles to ensnare the prey and sting it into submission. Hydra
reproduces both sexually, and asexually by budding—a process which is often ongoing
in the cultures we supply.
★MAINTENANCE: Keep Hydra in a small aquarium or large culture dish, in dim light at approximately
21 °C. Green Hydra requires 8–10 hours of light per day. Feed Hydra once a day on small Daphnia
or brine shrimp.
Catalog No. Description Pkg. Size Price/Pkg.
LM1089 Brown Hydra (Hydra sp.). The larger and more durable of
the types commonly available. This would be the choice
for behavioral studies and predator/prey studies with
Daphnia.
30 $10.35
LM1090 100 27.65
LM1091 Green Hydra (Chlorohydra viridissima). Smaller and more
delicate than brown hydra. Their green color is imparted
by symbiotic green algae (usually Chlorella).
30 14.45
LM1092 100 42.55
LM1093 Mixed Hydra—Brown and Green. Both types in a single
container. Useful to illustrate variation between species.
30 12.75
© Neo Sci
Hydra
LM1089, etc.
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