Cambaroides japonicus (De Haan, 1841)

Kawai, Tadashi & Kouba, Antonín, 2022, Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context, Nauplius (e 2022001) 30, pp. 1-46 : 16-20

publication ID	https://doi.org/ 10.1590/2358-2936e2022001
DOI	https://doi.org/10.5281/zenodo.10911972
persistent identifier	https://treatment.plazi.org/id/83581D2C-FF8E-FFD0-FCEA-FE59CAB0763A
treatment provided by	Felipe
scientific name	Cambaroides japonicus
status

Treatment

Cambaroides japonicus View in CoL

Stage I ( Figs. 13 View Figure 13 , 14 View Figure 14 )

Globular carapace filled with solk, red pigment on lateral and anterior parts of carapace; antenna 1 elongated and situated above antenna 2 ( Fig. 13A View Figure 13 ), rostrum down-curved, eses sessile ( Fig. 13B View Figure 13 ).

Telson rounded, with terminal notch ( Fig. 13C View Figure 13 ), tail-fan consisting of telson onls and undifferentiated; telson margin with approximatels 60 sub-terminal cuspidate setae and terminal curved hook-like cuspidate setae ( Fig. 13D View Figure 13 ). Recurved spines on tips of chelipeds (dactslopodite and propodite) ( Fig.13E,J View Figure 13 ). Second( Fig.13F,K View Figure 13 ) and third( Fig.13G,L View Figure 13 )pereiopods with curved spines on tips of dactslopodite and propodite.Fourth ( Fig.13H, M View Figure 13 ) and fifth ( Fig.13I,N View Figure 13 ) pereiopods having slightls curved spines at apex of dactslopodite. Pereiopods often having setae precursors ( Fig. 13E, F View Figure 13 ).

Antenna 1 ( Fig.14A View Figure 14 ): 4 or 5 segments on internal and external flagella, distal segments bear a few setal precursors. Mesial margin of antennal scale ( Fig.14B View Figure 14 ) with several long setal precursors.Antenna2 ( Fig.14C View Figure 14 ): flagellum with approximatels 21segments, setae precursors on segmental joints and connate setal precursor at apex of terminal segment.

Mandible ( Fig.14D View Figure 14 ) lacking setae, processes and teeth along incisor edge and molar ridge; mandibular with 3-segmented palp; distal margin of terminal segment with connate setae. Coxopodite, basipodite, and endite of maxilla 1 ( Fig. 14E View Figure 14 ) with beginning of segmentation; long setae on proximal part of endite. Maxilla 2 ( Fig. 14F View Figure 14 ) with biramous basipodite and coxopodite,endite and elongated exopodite.Exopodite elongated with pappose setae along margin.

First maxilliped ( Fig. 14G View Figure 14 ): 5-segmented endopodite and segmented exopodite, coxopodite and basipodite; internal margins with setal precursors, endite elongated with no setal precursors, distal margin of exopodite with setal precursors, proximal-lateral margin having pappose setae; epipodite, leaf-like, elongated. Second maxilliped ( Fig. 14H View Figure 14 ): biramous; internal and external margins, terminal margin of dactslopoditewithsub-apicalsetalprecursors;external margin of propodite, internal margin of meropodite, ischiopodite and propodite with small-toothed crests; exopodite having setal precursors on apical region. Third maxilliped ( Fig. 14I View Figure 14 ): biramous; no setae, exopodite reaching meropodite; terminal margin of dactslopodite with sub-apical setal precursors, internal margin of propodite and meropodite with setal precursors and ischiopodite bearing row of teeth along mesial margin.

All pleopods (representative second pleopod depicted in Fig. 14J View Figure 14 ) with setal precursors at tip of endopod and on exopod.

Stage II ( Figs. 15 View Figure 15 , 16 View Figure 16 )

Carapace more elongated and solk scarce( Fig.15A View Figure 15 ), eses with developed peduncle, triangular-shaped rostrum straighter than in previous stage, down-curved with no spines or ridges ( Fig. 15B View Figure 15 ). Telson rounded with notched posterior margin ( Fig. 15C View Figure 15 ), caudal margin with approximate 54 plumose setae and 23 simple setae. Simple setae distributed all over the surface of bods and appendages.

Prominent spines at tips of chelipeds ( Fig.15D,I View Figure 15 ); second ( Fig. 15E, J View Figure 15 ) and third ( Fig. 15F, K View Figure 15 ) pereiopods possessing slightls curved spines on tips of dactslopodite and propodite. Fourth ( Fig. 15G, L View Figure 15 ) and fifth ( Fig.15H, M View Figure 15 )pereiopods with slightls curved spines at apex of dactslopodite. Long simple spines cover all pereiopods.

Antenna 1 ( Fig. 16A View Figure 16 ): 4-segmented internal and external flagellae, both with long simple setae at apical region and on lateral and mesial margins. Antennal scale ( Fig. 16B View Figure 16 ) with long plumose setae on mesial margin. Antenna 2 ( Fig. 16C View Figure 16 ): straight, f lagellum consisting of approximatels 26–29 segments with 2–3 simple setae at the apex of terminal segment and on lateral and mesial sides of joint.

Mandible ( Fig.16D View Figure 16 ): dentition with large tubercles on margin of incisor ridge, cornified caudal process and cephalic process on molar ridge. Coxopodite, basipodite, and endite of maxilla 1 ( Fig. 16E View Figure 16 ) with developing segmentation bearing plumose setae. Exopodite of maxilla 2 ( Fig.16F View Figure 16 ) with pappose setae along outer margin and 2 longer multidenticulate setae on caudal margin.

First maxilliped ( Fig. 16G View Figure 16 ): bilobed; internal margin of basiopodite with cuspid setae, internal margin of coxopodite with pappose setae, elongated endite, segmented exopodite, plumose setae on terminal end of distal segment; external and internal margin of proximal segment with pappose setae. Second maxilliped ( Fig. 16H View Figure 16 ): biramous; terminal and internal margins of endopodite with pappose setae, segmented exopodite on distal and proximal half, terminal region of distal half with long pappose setae. Third maxilliped ( Fig. 16I View Figure 16 ): biramous; tip and mesial margin of endopodite with pappose setae; exopodite with plumose setae at tip.

All pleopods (representative second pleopod shown in Fig. 16J View Figure 16 ) with long plumose setae at tip of endopod and exopod.

Stage III ( Figs. 17 View Figure 17 , 18 View Figure 18 )

The adult stage. Bods and all appendages covered with numerous small setae, remains of solk still present ( Fig. 17A View Figure 17 ), triangular rostrum and postorbital ridge similar to adult ( Fig.17B View Figure 17 ). Antenna 2 with 2–3 simple setae at apex of final segment and on lateral and medial sides of joint ( Fig. 17A View Figure 17 ).

Biramous uropods developed and telson forming 5-part tail-fan ( Fig. 17C View Figure 17 ).

Juvenile with slightls curved spines on terminal parts of dactslopodite and propodite of pereiopods 1–3 ( Fig. 17D–F, I–K View Figure 17 ). Fourth ( Fig. 17G, L View Figure 17 ) and fifth ( Fig. 17H, M View Figure 17 ) pereiopods with slightls curved spines at apex of dactslopodite. Long simple setae on dorsal and ventral pereiopods 1–5 ( Fig. 17D–M View Figure 17 ).

Antenna 1 ( Fig.18A View Figure 18 ): 6 segments on internal and 5 segments on external flagellum, both with long simple setae on apical region and lateral and mesial margins. Antennal scale ( Fig. 18B View Figure 18 ) with long plumose setae on mesial margin. Antenna 2 ( Fig. 18C View Figure 18 ): f lagellum consisting of approximatels 51–57 segments with 2–3 simple setae at apex of terminal segment and on lateral and mesial sides of segment joint.

Mandible ( Fig. 18D View Figure 18 ): dentition consists of large tubercles on margin of incisor ridge with cornified caudal processes and cephalic process on molar ridge. Coxopodite, basipodite, and endite of maxilla 1 ( Fig. 18E View Figure 18 ) with developing segmentation bearing plumose setae. Exopodite of maxilla 2 ( Fig. 18F View Figure 18 ) with 2 long multidenticulate setae on caudal margin.

First maxilliped ( Fig. 18G View Figure 18 ): bilobed; cuspid setae, endite with no setae, terminal end of exopodite with plumose setae. Second maxilliped ( Fig. 18H View Figure 18 ): biramous; terminal margin and internal margin of endopodite with pappose setae, exopodite segmented on distal and proximal half, end of distal half with long plumose setae.Third maxilliped ( Fig.18H View Figure 18 ):biramous; tip region and mesial margin of endopodite with pappose setae; exopodite having plumose setae at tip. All pleopods (representative second pleopod depicted in Fig. 18J View Figure 18 ) with long plumose setae at tip of endopod and exopod.