On the Larval Development of Some Hermit Crabs from Hokkaido, Japan, Reared Under Laboratory Conditions (Decapoda: Anomura) (With 33 Text-figures and 7 Tables)

With 33 Text- figures and 7 Tables) FIRST ZOEA C.L. 1.45 mm (range = 1.43-1.47 mm) Carapace (Figs 2A, a).Frontal spine (=rostrum) distally pointed, moderately long, reaching to tip of antennules.Anterolateral margins with 1 tiny spine; posterolateral margins rounded.Surface glabrous.Anterior half of carapace with a middorsal carina, moderately developed.Antennule (Fig. 3A).Uniramous, elongate, bearing terminally 3 aesthetascs and 3 setulose setae; 1 seta sub terminally, reaching approximately to tips of aesthetascs.Antenna (Fig. 4A).Endopod slightly less than 1/2 length of scale, bearing 3 terminal setae, each profusely setulose, one of which is shorter than others.Exopod ( = scale) almost straight along outer margin, distolaterally pointed; inner margin moderately rounded, fringed with 10 setae, each profusely setulose.Distal seta as long as the distal spine of the scale.A stout spine, finely serrate along both margins emerges distally from the peduncle.Mandible (Figs 5A; 15A).Slightly asymmetrical.Incisor process acute, strong.Molar process with numerous small denticles and marginal teeth.No palp present at this stage.Maxillule (Fig. 6A).Endopod 3-segmented, with 1 short seta on the proximal segment, 1 long seta on the mid segment and 3 on the distal segment.Basial endite with 2 strong, rigid spines, not articulated, each with spinules on distal half, and 2 additional seta.Coxal endite with 7 seta.