Download e-book for kindle: Waterbug Book: A Guide to the Freshwater Macroinvertebrates by John Gooderham

Download e-book for kindle: Waterbug Book: A Guide to the Freshwater Macroinvertebrates by John Gooderham

By John Gooderham

I have had this publication for many years now and each time i have opened it truly is pages it hardly ever disappoints. A convenient connection with take with you at the box (waterproofing no longer integrated) or a brief advisor to envision in ahead of diving into an intensive dicot key. A beneficial purchase!

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Extra resources for Waterbug Book: A Guide to the Freshwater Macroinvertebrates of Temperate Australia

Example text

Thiaridae (p. 58) shell without sculpturing, or with less complicated sculpturing . . . . . . . . . 10 9 10(9) animal found in salt, or coastal lakes, high spired . . . . . Pomatiopsidae (p. 57) 10 animal found in freshwater, or at the estuarine end of rivers . . . . . . . . . . 11 11(10) operculum with spiral pattern, typically smaller than 10 mm 11 ........................ . . . . . . . . . . . . . . .

Tubificid worms burrow head first into the mud. Pristina sp. has a characteristic anterior proboscis. Environmental significance Natural history Oligochaetes are probably the only freshwater invertebrates that can occur in totally degraded habitats such as sewage outlets and degraded urban streams. They seem to survive in streams with nutrient and pollution levels many times greater than the accepted level. Some worms can live in waters with an oxygen concentration close to zero. Most freshwater worms are hermaphrodites, possessing both male and female reproductive organs.

Class: Gastropoda, Families: Bithyniidae and Viviparidae Distinguishing characteristics The snails from both these families have squat, dextrally coiled shells (opening to the right) and an operculum patterned with concentric rings. They are also both anonymously cream–brown coloured. The bithyniids are slightly smaller when fully grown, reaching a maximum of 12 mm, while the viviparids can be twice this size. The two families also differ in that the middle concentric ring on the operculum of the Viviparidae is slightly off-centre.

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