Figure 6. A in The feeding mechanisms of Lynceus (Crustacea: Branchiopoda: Laevicaudata), with special reference to L. simiaefacies Harding

Figure 6. A, endopodite of trunk limb 5 (En5) and adjacent scraper-bearing elements. Anterior (to the left) of it are scrapers of the endopodite and endite 5 of trunk limb 4. The endopodite of trunk limb 5 overlies endite 5 of the same limb. The latter bears a row of scrapers distally: more proximally can be seen some of its armature of often pointed spines. More posteriorly, the posterior margin of the endopodite of trunk limb 6 can just be seen. Note the arrangement of scrapers on the endopodite of trunk limb 5. Proximally they are short. More distally they become progressively longer. Most are stout, but the three distalmost, which are the longest, are finely toothed and over-reach and sweep up material dislodged by their shorter, more robust companions. The distalmost spine in the series is smooth. The short, finely toothed proximal scrapers are suitably located to sweep material brought within reach by distal scrapers of the assemblage in front during the previous cycle. Scale bar 100 Mm. B, details of the posterior region of a gnathobase typical of the middle of the series, showing, posteriorly, one of the stout denticulate spines that sweep material forward, i.e. to the left, along the food groove. Near its base is a sensilla. Between the other two conspicuous elements can just be seen the basal portion of the second stout denticulate spine. This lies more laterally, i.e. nearer to the food groove wall, at a deeper level of focus in the darkness of the food groove. Anterior to the posterior denticulate spine is a smooth spine and, anterior to that, a robust sweeping spine with a reflexed distal portion that bears long spinules. The flexure is probably not an artefact (cf. trunk limb 9, Fig. 5B). The distal part of this spine is partly obscured by the long setules of an adjacent sweeping seta (cf. trunk limb 9, Fig. 5B). Scale bar 20 Mm.