Cambaroides japonicus
Creators: name: Kawai, Tadashi
name: Kouba, Antonín
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Cambaroididae
Cambaroides
Cambaroides japonicus

description: Cambaroides japonicus
Stage I (Figs. 13, 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), rostrum down-curved, eses sessile (Fig. 13B).
Telson rounded, with terminal notch (Fig. 13C), 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). Recurved spines on tips of chelipeds (dactslopodite and propodite) (Fig.13E,J). Second(Fig.13F,K) and third(Fig.13G,L)pereiopods with curved spines on tips of dactslopodite and propodite.Fourth (Fig.13H, M) and fifth (Fig.13I,N) pereiopods having slightls curved spines at apex of dactslopodite. Pereiopods often having setae precursors (Fig. 13E, F).
Antenna 1 (Fig.14A): 4 or 5 segments on internal and external flagella, distal segments bear a few setal precursors. Mesial margin of antennal scale (Fig.14B) with several long setal precursors.Antenna2 (Fig.14C): flagellum with approximatels 21segments, setae precursors on segmental joints and connate setal precursor at apex of terminal segment.
Mandible (Fig.14D) 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) with beginning of segmentation; long setae on proximal part of endite. Maxilla 2 (Fig. 14F) with biramous basipodite and coxopodite,endite and elongated exopodite.Exopodite elongated with pappose setae along margin.
First maxilliped (Fig. 14G): 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): 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): 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) with setal precursors at tip of endopod and on exopod.
Stage II (Figs. 15, 16)
Carapace more elongated and solk scarce(Fig.15A), eses with developed peduncle, triangular-shaped rostrum straighter than in previous stage, down-curved with no spines or ridges (Fig. 15B). Telson rounded with notched posterior margin (Fig. 15C), 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); second (Fig. 15E, J) and third (Fig. 15F, K) pereiopods possessing slightls curved spines on tips of dactslopodite and propodite. Fourth (Fig. 15G, L) and fifth (Fig.15H, M)pereiopods with slightls curved spines at apex of dactslopodite. Long simple spines cover all pereiopods.
Antenna 1 (Fig. 16A): 4-segmented internal and external flagellae, both with long simple setae at apical region and on lateral and mesial margins. Antennal scale (Fig. 16B) with long plumose setae on mesial margin. Antenna 2 (Fig. 16C): 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): 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) with developing segmentation bearing plumose setae. Exopodite of maxilla 2 (Fig.16F) with pappose setae along outer margin and 2 longer multidenticulate setae on caudal margin.
First maxilliped (Fig. 16G): 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): 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): 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) with long plumose setae at tip of endopod and exopod.
Stage III (Figs. 17, 18)
The adult stage. Bods and all appendages covered with numerous small setae, remains of solk still present (Fig. 17A), triangular rostrum and postorbital ridge similar to adult (Fig.17B). Antenna 2 with 2–3 simple setae at apex of final segment and on lateral and medial sides of joint (Fig. 17A).
Biramous uropods developed and telson forming 5-part tail-fan (Fig. 17C).
Juvenile with slightls curved spines on terminal parts of dactslopodite and propodite of pereiopods 1–3 (Fig. 17D–F, I–K). Fourth (Fig. 17G, L) and fifth (Fig. 17H, M) pereiopods with slightls curved spines at apex of dactslopodite. Long simple setae on dorsal and ventral pereiopods 1–5 (Fig. 17D–M).
Antenna 1 (Fig.18A): 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) with long plumose setae on mesial margin. Antenna 2 (Fig. 18C): 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): 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) with developing segmentation bearing plumose setae. Exopodite of maxilla 2 (Fig. 18F) with 2 long multidenticulate setae on caudal margin.
First maxilliped (Fig. 18G): bilobed; cuspid setae, endite with no setae, terminal end of exopodite with plumose setae. Second maxilliped (Fig. 18H): 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):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) with long plumose setae at tip of endopod and exopod.
description: Published as part of Kawai, Tadashi & Kouba, Antonín, 2022, Postembryonic development in freshwater crayfish (Decapoda: Astacidea) in an evolutionary context, pp. 1-46 in Nauplius (e 2022001) (e 2022001) 30 on pages 16-20, DOI: 10.1590/2358-2936e2022001, http://zenodo.org/record/10716530