Table 2 Similarities and differences between postlarval instar 1 of the pallenopsids studied
Instar 1 (hatching stage) | Species | ||
|---|---|---|---|
P. villosa | P. hodgsoni | P. vanhoeffeni | |
Nutrition | lecithotrophic | lecithotrophic | lecithotrophic |
Size (a-p axis in mm) | ≥ 1.5 | 1.0–1.2 | ? |
Ocular tubercle | not yet elevated | not yet elevated | ? |
Eyes | anlagen present | anlagen present | ? |
Proboscis | barrel-shaped | bullet-shaped | ? |
Cheliphore | 3-articled | 3-articled | ? |
Chela fingers | evenly curved toward tip | proximal part +/− straight, then curving toward tip | ? |
Attachment gland process | multiple & short | single & short | ? |
Palpal larval limb | 3-articled; >ovigeral limb | 3-articled > > ovigeral limb | ? |
Ovigeral larval limb | “3-articled” → articles 1&2 not well-defined | “3-articled” → articles 1&2 not well-defined | ? |
Walking leg 1 | externally 8-articled; internally propodus & tarsus not yet separated | externally 8-articled; internally propodus and tarsus distinctly separated | elongate – structural details unknown |
Walking leg 2 | elongate limb bud; internally 8 articles defined | elongate limb bud; internally 9 articles defined | elongate – structural details unknown |
Walking leg 3 | tiny elevation w/ compressed internal tissue | tiny elevation w/ compressed internal tissue | tiny elevation w/ compressed internal tissue |
Walking leg 4 | internal primordium; externally not recognizable | internal primordium; externally not recognizable | ? |
Anal tubercle | w/ slit-shaped proctodeum; anus not open yet | w/ slit-shaped proctodeum; anus not open yet | anus not open yet |
Ventral side of trunk | w/ intersegmental folds | ? | ? |
Dorsal side of trunk | no signs of segmentation | no signs of segmentation | no signs of segmentation |
Central nervous system | all ventral ganglion anlagen present ; distinct a-p gradient | all ventral ganglion anlagen present ; distinct a-p gradient | ? |