1. |
Eyes oviform, close together (e.g. Fig. 2A). |
2. |
Carapace with ventral margins convex, without supraorbital spines (Fig. 2D). |
3. |
Inner flagellum of antennule in the form of a stout rod (e.g. Fig. 2A) or of many segments (Fig. 2I). |
4. |
Antennal exopod not distally segmented (except in early larvae of
Pontocaris lacazei (Fig. 2I). |
5. |
Exopod of maxilla without proximal extension (Fig. 2C, cf. Figs. 3K, 4I). |
6. |
Pereiopod 1 with rudimentary subchela in late larvae, propodus broad (Fig. 2D). |
Key to larvae of New Zealand Crangonidae
A. |
Larvae with all appendages present except the uropods, or uropods present but endopod rudimentary; in latter case pleopod buds large, i.e. abbreviated development |
Sclerocrangon Prionocrangon Fam. Glyphocrangonidae |
|
Larvae with unabbreviated development |
B |
B. |
Abdomen less than twice length of carapace, without dorsomedial spine on somite 3 (although this somite may have paired postero-lateral spines); posterior margin of telson weakly concave or straight |
C
|
|
Abdomen more than twice length of carapace, with dorsomedial spine on somite 3; posterior margin of telson strongly concave |
D |
C. |
Base of rostrum with concave lateral margins (Fig. 2A); exopods of maxillipeds 2-3 and pereiopods 1-2 with no more than six setae (Fig. 2D); posterior margin of telson straight from zoea 4 onward |
Pontophilus australis P. chiltoni P. hamiltoni P. pilosoides (other
Pontophilus spp.?) |
|
Base of rostrum with convex lateral margins (Fig. 2B); exopods of maxillipeds 2-3 and pereiopods 1-2 with more than six setae; posterior margin of telson weakly concave in ll larvae |
'Pontophilus-group B' |
D. |
Abdominal somite 5 with strong posterolateral spines; inner flagellum of antennule horter than carapace (Fig. 2H). |
'Pontophilus-group A' (? Including P. indicus & P. challengeri from group 1 of Kemp 1916) |
|
Abdominal somite 5 without posterolateral spines; inner flagellum of antennule longer than carapace, of many segments from zoea 2 onward (Fig. 2I) |
Pontocaris lacazei
|