The Cambridge natural history, Vol. 08 (of 10)Gadow, Hans
Science
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
Animals
_T. viridescens_ is common throughout the Northern and Eastern parts of the
United States. Large females are about 11 cm. long, the males 1 cm. less.
The general colour above is brown, with a tinge of green; on each side of
the trunk, with a row of bright vermilion spots; the under parts are
orange, studded with small black dots. Half-grown specimens are brownish
red, with the same lateral red spots as the adult. According to Jordan,[61]
this voracious species lives chiefly on the larvae of insects, on small
molluscs such as _Cyclas_ and _Planorbis_, on earthworms and on small
Crustacea. It is eminently aquatic in the adult stage. The eggs are laid
from April to June, the period lasting for one individual four to six
weeks, or even longer. One female laid 108 eggs in all from 20th April to
30th May. After having selected a suitable plant, for instance an
_Anacharis_ or a bunch of _Fontinalis_ leaflets, she bestrides the plant
and gathers in the surrounding shoots with her hind-limbs, {129}pressing
the leaves closely around the cloaca. She next turns on her side, or
occasionally on her back; with fore-limbs outstretched and rigid, with
hind-limbs and leaves completely hiding the cloaca, she remains perfectly
motionless for six to eight minutes. Then she slowly leaves the "nest,"
which now holds an egg well protected by a tangle of shoots glued together
by the gelatinous secretion poured out of the cloaca. Jordan concludes,
from the fact that he never found spermatozoa in the oviducts, that the
eggs are fertilised just before they are expelled, when passing the
receptaculum seminis.
The metamorphosed young pass their life on land under stones and logs as
the so-called red variety, which is merely a stage in the life-history of
the species. It seems to take them several years to reach maturity, and to
become again typically aquatic. Young, red individuals which I have myself
kept, have behaved for more than a year like the young of other newts,
spending their time under moss and bark without going into the water.
The change from the red-spotted stage has been exhaustively studied by
Gage.[62] He remarks that this species is very common near Ithaca, in an
upland forest and along the head-waters of the Susquehannah. The
transformation takes place either in the autumn or in the spring, either
while the newt is still on land, or after entering the water.
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