Kamis, 17 Desember 2009
| 1 |  | Batrachobdella sp. (probably) picta (Verrill) - a freshwater leech Batrachobdella, another proboscis leech (Rhynchobdellida), is not common in Alberta. In other regions of North America, Batrachobdella picta specimens have been reported taking their blood meal f... |
| 2 |  | Dina sp. or Mooreobdella sp. - a worm leech Two additional genera of worm leeches in Alberta are Dina and Mooreobdella. The two genera have three or four pair of eyes. Non-specialists can find them difficult to tell apart, especially prese... |
| 3 |  | Erpobdella punctata (Leidy) - a worm leech Erpobdella punctata is another worm leech. Adults are about the same size as adult Nephelopsis, but Erpobdella’s pigmentation, with two or four longitudinal rows of dark spots (in fresh spe... |
| 4 |  | Glossiphonia complanata (Linnaeus) - a freshwater leech Glossiphonia complanata is probably the most collected leech by pond-net sampling in Alberta. Specimens have three pairs of eyes and characteristic pigmentation. The photo specimen is about 20 mm... |
| 5 |  | Helobdella fusca (Castle) - a freshwater leech This is the blotched form of Helobdella fusca. The photo specimen is about 12 mm in length. Helobdellids’ one pair of eyes are sufficiently separated to distinguish both eyes. Photograp... |
| 6 |  | Helobdella fusca (Castle) - a freshwater leech Helobdella fusca, another rhynchobdellid, has different color forms. This is a striped form. Helobdella fusca specimens parasitize aquatic gastropods. The photo specimen is about 12 mm in length.... |
| 7 |  | Helobdella stagnalis (Linnaeus) - a freshwater leech Helobdella stagnalis is one of most common leeches in Alberta. A small but conspicuous plate (scute), often red, on the anterior end of the dorsum will separate stagnalis from other leeches in Al... |
| 8 |  | Lumbriculus sp. or Stylodrilus sp. - aquatic earthworms Finally one that looks like an earthworm. The photo specimen is about 35 mm in length. A conspicuous reproductive feature of terrestrial earthworms, for example Lumbricus, is the clitellum, a per... |
| 9 |  | Mollibdella grandis (Verrill); also called Haemopis grandis - a jawed leech The other common jawed leech of Alberta is Mollibdella grandis. At one time both grandis and marmorata were in the genus Haemopis. The photo specimen is about 200 mm in length. Although neither P... |
| 10 |  | Nephelopsis obscura (Verrill) - a worm leech Another order of leeches found in Alberta is Pharyngobdellida. There is only one family, Erpobdellidae. Whereas rhynchobdellids usually have a small mouth through which a proboscis protrudes duri... |
| 11 |  | Percymoorensis marmorata (Say); also called Haemopis - jawed leech marmorata The third order of leeches is Gnathobdellida, sometimes called the jawed leeches. There is only one family in Alberta, Hirudinidae. Like pharyngobdellids, they also have a large mouth in the ante... |
| 12 |  | Piscicola milneri (Verrill) - a fish leech Most fish leeches are readily distinguished by their large anterior sucker (most also have a large posterior sucker), and of course usually being attached to fish. After taking a blood meal, the ... |
| 13 |  | Piscicola punctata - a fish leech, on Brook trout Piscicola punctata on a Brook trout, Salvelinus fontinalis from the Tay River, Alberta. Photograph: Wayne Roberts |
| 14 |  | Placobdella ornata (Verill) - a freshwater leech This large, leaf-like rhynchobdellid is parasitic on turtles, but can sometimes be collected by pond net sampling when the leech is not attached to the host. The photo specimen is about 28 mm in ... |
| 15 |  | Placobdella papillifera (Verrill) - a freshwater leech This placobdellid is also a parasite of turtles, but can also be free-living. The photo specimen is about 15 mm in length. Note the one pair of eyes, very close together. Placobdella papillifera ... |
| 16 |  | Rhynchelmis elrodi Smith and Dickey - an aquatic earthworm Rhynchelmis is a larger aquatic earthworm. Note the conspicuous proboscis Photograph: Randy Mandryk |
| 17 |  | Specaria josinae (Vejdovsky) - a freshwater oligochaete Freshwater oligochaetes, the aquatic earthworms, are found in all types of aquatic habitats. Some oligochaetes, for example, the red worm Tubifex and relatives, when they occur in large numbers... |
| 18 |  | Theromyzon sp. - an aquatic leech There are both aquatic and terrestrial leeches. Only aquatic leeches occur in Alberta. They are related to oligochaetes but lack setae and have suckers on the anterior and posterior regions of th... |
| 19 |  | Coho Salmon - Oncorhynchus kisutch Coho salmon (jack) head with leeches |
| 20 |  | Tubifex Worm Tubifex worms are aquatic oligochaet annelids. They are good indicators of near anaerobic or polluted conditions. They live in mud burrows with their heads down in the mud and their posteriors st... |
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