Macrochelodina rugosa (Ogilby, 1890)
Northern Snake-Necked Turtle
 (includes former Chelodina siebenrocki)

Macrochelodina rugosa is distributed in Northern Australia (Northern Territory and Queensland). It also occurs in southern New Guinea west of the Fly river and on certain islands in the Torres strait and in the neighbouring southern part of Irian Jaya.

The oblong carapace is dark brown or almost black. The turtle reaches almost 30cm and has a yellow to light brown Plastron. Head and neck are grey to brown on top and cream-colored on the bottom.
The typical habitat of Macrochelodina rugosa are tidal areas of small streams, swamps, marshes and offshore islands.
Macrochelodina rugosa is a species that is known to deposit the eggs under water (underwater nesting)
 
 
Siebenrocki2
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Net-like head pattern of M. rugosa
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Adult male
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Plastron of adult female
 
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M. rugosa egg
Typical size 36 mm x 26 mm
Weight 14 g
 
 
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Hatchling has opened the top of the egg and is about to emerge
 
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New born hatchling of M. rugosa
 
 
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Plastron view of new born hatchling
Still folded and with yolk sack


Hatchlings appear after 100 days if incubated at 29-30 degrees.
Both of my M. rugosa females accept normal humidity nesting conditions as prefered by most other Chelodina species.
However it has been reported several times by various persons that some M. rugosa prefers to nest into absolute wet (saturated) substrate or even lay their eggs under water.
Those eggs start to develop as soon as the substrate dries out. Therefore the developing time may extend up to 6 month or longer for those clutches. This behavior is also known from other Macrochelodinas.
 
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