Fortuynia shibai Aoki, 1974

Fortuynia shibai Aoki, 1974 View in CoL

Larva

(N = 4): length 200–234 µm (mean 224 µm).

Prodorsum ( Figure 1 View Figure 1 (a)). Interlamellar seta only alveolar, exobothridial seta minute.

Gastronotic region ( Figure 1 View Figure 1 (a,c)). Eleven pairs of long notogastral setae (length 31–35 µm), c 1-3, da, dm, dp, la, lm, lp, h 1-2, all distally slightly serrate, except for h2. Transversal ridge on centrodorsal plate passing posterior line of setae lm and dm.

Podosoma and venter ( Figure 1 View Figure 1 (b)). Epimeral setation 2-1-2, all setae short (approx. 8 µm) and spiniform. Claparède’s organ globular, nearly completely covered by epimeral cuticle. Aggenital, genital, adanal and anal setae not developed.

Legs ( Figure 2 View Figure 2 ). Femora I and II with large triangular porous areas on paraxial side. Two slender paraxial longitudinal porous areas on femur III, one dorsally the other ventrally. Setation and solenidia see Table 1.

Protonymph

(N = 10): length 277–313 (mean 292 µm).

Gastronotic region ( Figure 3 (a,c)). Fifteen pairs of notogastral setae; c 1-3, da, dm, dp, la, lm, lp, h 1-3, p 1-3. Seta c 1, da, dm, la, lm, h 2 long (43–62 µm) and distally slightly barbed, c 2, c 3, lp spiniform normal (22–31 µm), dp, h 3 short (ca. 8 µm) and h 1 very short (ca. 4 µm). Setae p 1-3 spiniform, normal length (20–30 µm).

Podosoma and venter ( Figure 3 (b)). Epimeral setation 3-1-2-1, all setae spiniform and approx. same length (6–9 µm). Seta 1 c and 4a added in this stage. One pair of short genital setae g 1. Adanal and anal setae not developed. Cupule of lyrifissure ip anterior of anal opening.

Legs ( Figure 4 View Figure 4 ). Porous areas on legs I–III same as in larva. Femur IV with two paraxial longitudinal porous areas, one dorsally, one ventrally. Setation and solenidia are shown in Table 1.

Deutonymph

(N = 14): length 344–406 µm (mean 364 µm).

Gastronotic region ( Figure 5 (a)). Fifteen pairs of notogastral setae, same positions and shapes as in protonymph, except for p 1-3 positioned more laterally, p 1 longest (102–114 µm), p 2-3 short (11–13 µm).

Podosoma and venter ( Figure 5 (b)). Epimeral setation 3-1-2-2, seta 4b added in this stage. Two pairs of short genital setae g 1-2. One pair of aggenital setae. Three pairs of adanal setae flanking anal orifice. Two pairs of vestigial anal setae. Cupule of lyrifissure iad anterior of anal opening.

Legs ( Figure 6 View Figure 6 ). Porous areas same as in protonymph. Setation and solenidia see Table 1.

Tritonymph

(N = 4): length 400–463 µm (mean 429 µm).

Gastronotic region ( Figure 5 (c)). Fifteen pairs of notogastral setae (12–115 µm), no difference to deutonymph.

Podosoma and venter ( Figure 5 (d)). Epimeral setation 3-1-3-2, seta 3 c added in this stage, close to trochanter III. Four pairs of genital setae g 1-4. Three pairs of adanal setae; ad 2-3 short (ca. 9 µm), ad 1 at least twice as long (ca. 40 µm). Two pairs of short anal setae (9–11 µm), fully developed in this stage.

Legs. Setation and solenidia are shown in Table 1.

Remarks

The barbulation of notogastral setae shown in the adults of F. shibai is already present in the larval stage and remains constant throughout the development. Fortuynia shibai adults also show porous areas on all femora and trochanters III and IV. The femoral porous areas are already present in all juvenile stages but porous areas on trochanters could not be confirmed in any ontogenetic stage (either they are difficult to trace or they are only developed in the adult stage).