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The final instar larva of Heliaeschna idae Brauer is described and figured for the first time based on the exuvia from an advanced female larva collected in Sarawak, Borneo (East Malaysia). It is compared with the known larvae of the genus and is concluded to be most closely allied to Heliaeschna simplicia Karsch, with which it shares a unique stru...

Contexts in source publication

Context 1
... ratio of segments 1-7 as follows: 1.0 : 1.1 : 1.7 : 1.1 : 1.3 : 1.0 : 1.0. Head with rather low profile ( Figure 3a); vertex scarcely rising above level of eyes; frons slightly convex anteriorly but with median transverse groove; ante-and postclypeus broad and well defined but almost in same plane, labrum slanted sharply downward. Labium (Figure 2b, c, d, e) with prementum long and robust, the distal third expanded laterally with a rounded margin bearing a row of 30+ strong, dark, recurved spines. ...
Context 2
... Seen in profile upper side of head strongly raised, culminating in a slightly swollen summit immediately behind ocelli (Figure 3b). This area bears a tuft of long thick setae. ...
Context 3
... main differences between H. idae and H. simplicia are: the cerci are relatively much longer in H. idae; the shape of the supracoxal processes differs, especially the posterior process which is subquadrate in H. idae rather than triangular as in H. simplicia; seen dorsally the head is more robust in H. idae with the postocular lobes better developed; the mask is generally slightly more sturdy, with the fixed hooks on the labial palps blunter and heavier, with very much coarser serrations on their inner margin, suggestive of a different diet; the mandibles are quite similar in their outer profile, the outer angle being only a little more acute in H. simplicia, but the internal dentition is quite different, with H. idae having shorter incisor and molar processes, the latter being bifid rather than a single long spine as in H. simplicia. The most obvious difference between the two species is the presence in H. simplicia of a strongly elevated area of the vertex surmounted by a tuft of long setae (Figure 3c). In H. idae this area is reduced to a low, slightly swollen convexity and bears only a modest tuft of short dark setae. ...

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Citations

... There is an additional complication in that H. idae was described from a female but H. crassa from a male, so it is at least possible that H. crassa is a junior synonym of H. idae and that the species referred to as H. idae here is actually unnamed. I can find no reliable means to separate females of these taxa at present, and for this reason the female Heliaeschna reared from a larva described as that of H. idae in Orr, Ngiam & Dow (2013) is regarded as of uncertain status here. Note 53. ...
... Note 53. Orr, Ngiam & Dow (2013), on the basis of larval characteristics, questioned the inclusion of this species in Heliaeschna. This is an issue that is only likely to be resolved through molecular analysis. ...
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The first checklist of the Odonata (dragonflies and damselflies) of the state of Sarawak in Malaysian Borneo is presented. 303 species are included in the list. Records are given to district level. For each species, a reference to the first record from each district in which it occurs is given, except where this paper represents the first published district record, in which case this is indicated. Additionally all references for the species containing original records from Sarawak, or significant discussion of material from or relevant to Sarawak, are given. Known taxonomic issues are discussed in notes. The number of records from each district and division is summarised.