4. THE LARVAE
127
TABLE 11. RANGE IN LENGTH (MM) OR MEAN LENGTH OF DIFFERENT LARVAE
Nyctiphanes australis (Sheard, 1953), Thysanoissa raschii (Mauchline, 1965a),
AND Meganyctiphanes norvegica (Mauchlime, 1959)
Nyctiphanes
Thysanoessa Meganyctiphanes
australis
raschii
norvegica
Calyptopis I
I1
I11
Furcilia
I
I
I
I
I
I
I1
II
I1
I1
I1
I1
I1
I1
I1
IT
I1
I1
I1
I1
I11
I11
C I
c I1
CIII
ON
1N
2N
3N
4N
5N
1s 1N
I S 2N
IS 3N
1s 4N
2 s
25 1N
2 s 2N
2s 3N
3 s
35 1N
3s 2N
4s
4s 1N
5s 7sp
65 7sp
5s 6sp
5s 5sp
5 s 4sp
6s 3sp
5s 2sp
5s lsp
0.80-1.40
1.40-1.90
1.60-2.40
1.90-2.60
2.10-2.80
2.15-3.00
2.05-3.00
2-60-3.30
2.90-3.00
2.75-2.90
2.70-2.80
2'90-3.05
2.90-3'00
2.80-2.85
2.90-3.20
3.00-3.60
3.00-3.50
3.00-3.05
2.90-3.20
3.00-3'60
3.40-3.45
3.00-4.00
3.40-4.00
3.60-4.35
3.60-4.80
4.10-4.60
4.30-6.00
0.70-1.04
1.03
1.20-1.70
1.59
1.70-2.60
2.40
2.10-3.30
2.76
2.70-3.40
2.85
2.50-3.50
2.85
2.70-3'80
3.35
3.00-4.10
2.70-3'20
3.20-3.60
3.00-3.85
3.65
3.16-3.50
3.16-4.16
3.70
3.10-4.30
4.00
3'27-4.80
4.50
5.70
6.00
6.80
7.70
7.50
Adolescent
5.25-7-50
twentieth station, where he caught 619 larvae, there was an unusually
large number of variant forms and the dominant pathway of development was different (Fig. 49). Similar local variation is present in the
development of Meganyctiphanes norvegica and, as previously mentioned, in that of Nyctiphanes australis (Fig. 49). Not only can the
relative numbers of variant (minority) forms be different in different
places and times but the dominant forms can also be different. Consequently, sampling requires to be extensive geographically and in time
5
'