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Zoology Publications from Victoria University of Wellington—Nos. 78, 79 and 80

Crangonid larval characters

Crangonid larval characters

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 Cpage 7
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