Camposcia retusa
Creators: name: Xu, Tian
name: Zeng, Chaoshu
name: Hutson, Kate S.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Inachidae
Camposcia
Camposcia retusa

description: Description
Zoea I
Size: RDL = 1.94 ± 0.10 mm; CL = 1.18 ± 0.09 mm. (Number of examined specimens: 12).
Carapace (Fig.1A). With 1 short curved dorsal spine, 1 straight rostral spine, and 1 lateral spine on each side of the carapace; each lateroventral margin with 1 densely plumose ‘anterior seta’, which is defined as ‘majid seta’ (Clark et al., 1998), and followed by 5 sparsely plumose setae; eyes sessile.
Antennule (Fig.1B). Unsegmented, smooth, conical; 3 aesthetascs present at the terminal end; endopod absent.
Antenna (Fig. 1C). Biramous; protopod long and pointed, with 2 rows of tiny spinules; endopod bud presents; exopod unsegmented, with spiny distal processes; 2 plumose setae present about half-way from the tip.
Mandible (Fig. 1D). Asymmetric; with median toothed molar and lateral incisor processes, areas between incisor and molars have serrulate processes; palp absent.
Maxillule (Fig. 1E). Coxal endite bearing 6 plumodenticulate setae; basial endite with 7 plumodenticulate setae; endopod bi-segmented, with 1 and 6 plumodenticulate setae on proximal and distal segment, respectively.
Maxilla (Fig. 1F). Coxal endite bilobed, with 4 and 5 plumodenticulate setae on the proximal and distal lobe, respectively; basial endite bilobed, with 5 and 4 plumodenticulate setae on the proximal and distal lobe, respectively; endopod unsegmented, bearing 8 plumodenticulate setae; exopod (scaphognathite) with 17–18 plumose setae distribute around the margin, plus 1 stout distal process.
Maxilliped I (Fig. 1G). Coxa naked; basis bearing 9 plumodenticulate setae arranged at 2 + 2 + 2 + 3; endopod five-segmented and the segments from proximal to distal with 3, 2, 1, 2, 5 plumodenticulate setae, respectively; exopod incompletely bi-segmented, proximal segment naked and distal segment with 4 long plumose terminal natatory setae.
Maxilliped II (Fig. 1H). Coxa naked; basis bearing 3 plumodenticulate setae arranged at 1 + 1 + 1; endopod three-segmented and the segments from proximal to distal with 0, 1, 4 plumodenticulate setae, respectively; exopod incompletely bi-segmented, bearing 4 long plumose terminal natatory setae on the distal end.
Maxilliped III (Fig. 1I). Undeveloped, present as a small biramous bud.
Pereiopods (Fig. 1J). Undeveloped, present as small buds. The first pereiopod bilobed, appears in a shape of chela.
Pleon (Fig. 1K). From somites 1 to 5, there are 4, 2, 2, 2, 2 simple setae on dorsal surface of each somite, respectively; somites 2–5 with pleopod buds.
Pleopods. Absent.
Telson (Fig. 1K). Bifurcated with a U-shape cleft; 3 pairs of serrulate setae on the middle of posterior margin; 1 pair of lateral acicular spines and 2 pairs of dorsolateral spinules present on the base of furcal shaft; furcal shafts covered with rows of spines from proximal to terminal.
Zoea II
Size: RDL = 2.24 ± 0.06 mm; CL = 1.42 ± 0.05 mm. (Number of examined specimens: 12).
Carapace (Fig. 2A). Lateroventral margin with 1 densely plumose ‘anterior seta’ plus 6 sparsely plumose setae; eyes stalked.
Antennule (Fig. 2B). Presents 2 terminal buds, coxa and basis are not differentiated, exopod with 8 aesthetascs present on the distal end.
Antenna (Fig. 2C). Endopod bud enlarged.
Mandible (Fig. 2D). Palp presents, naked, unsegmented.
Maxillule (Fig. 2E). Coxal endite bearing 7 plumodenticulate setae; basial endite bearing 9 plumodenticulate setae, with 1 plumose seta present on external margin; endopod bi-segmented, with 1 and 6 plumodenticulate setae on proximal and distal segment, respectively.
Maxilla (Fig. 2F). Coxal endite bilobed, with 4 and 3 plumodenticulate setae on the proximal and distal lobe, respectively; basial endite bilobed, with 4 and 5 plumodenticulate setae on the proximal and distal lobe, respectively; endopod unchanged; scaphognathite marginally with 32–34 plumose setae, including one distal stout process.
Maxilliped I (Fig. 2G). Coxa, basis and endopod unchanged, except endopod distal segment now with 6 plumodenticulate setae; exopod distal segment with 6 terminal plumose natatory setae.
Maxilliped II (Fig. 2H). Exopod distal segment with 6 terminal plumose natatory setae; other parts largely unchanged.
Maxilliped III (Fig. 2I). Developing, a triple-lobed bud present.
Pereiopods (Fig. 2J). Developing, longer. A distinct but non-functional cheliped present.
Pleon (Fig. 2K). 6 somites; from somites 1 to 6, there are 5, 4, 4, 2, 2, 0 simple setae on dorsal surface of each somite, respectively; somites 2–5 with pleopod buds.
Pleopods (Fig. 2A). Present as small biramous buds.
Telson (Fig. 2K). Unchanged except 1 pair of simple setae present on the U-shape cleft.
Megalopa
Size: CL = 1.45 ± 0.15 mm; CW = 0.95 ± 0.09 mm. (Number of examined specimens: 8).
Carapace (Fig. 3A). More crab-like; length longer than width, dorsoventrally compressed; dorsal surface covered sparsely with simple setae; one posterior median process present, and two anterolateral processes present on the dorsal surface; anterolateral margin has 2 simple setae; one process mid-posterior margin; posterior margin with 3 pairs of simple setae.
Antennule (Fig. 3B). Peduncle with three segments and the segments from proximal to distal with 0, 0, 2 simple setae, respectively; endopod developed, with 3 simple setae; exopod two-segmented, the proximal segment bearing 3–4 long aesthetascs, and the distal segment with 4 aesthetases plus 1 simple setae.
Antenna (Fig. 3C). Segments 1–7, progressing proximally to distally, each with 1, 2, 4 (2+2), 0, 0, 5 (2 short and 3 long, terminally), 4 (1 short and 3 long, terminally) simple setae, respectively; exopod peduncle present on basis.
Mandible (Fig. 3D). Asymmetrical; the left has wedge-shape blade with cutting edge; the right blade rounded with cutting edge; both mandibles with incompletely two-segmented palp, distal segment with 6 terminal plumodenticulate setae.
Maxillule (Fig. 3E). Coxal endite with 8 apical plumodenticulate setae; basial endite with 16 mostly plumodenticulate setae distally; endopod partly bi-segmented and reduced, lacking setae.
Maxilla (Fig. 3F). Coxal endite with 5 + 3 plumodenticulate setae; basial endite with 6 + 6 plumodenticulate setae; endopod naked and reduced; scaphognathite bearing 33–35 marginal plumose setae and 2 plumodenticulate setae on the blade.
Maxilliped I (Fig. 3G). Coxa and basis with 7 and 9 plumodenticulate setae, respectively; endopod unsegmented and naked; exopod bi-segmented, proximal segment with 0–1 plumodenticulate seta, and distal segment with 4 long plumose setae; epipod triangular and naked.
Maxilliped II (Fig. 3H). Coxa and basis without seta and are not clearly differentiated; endopod with an indistinct basis and subsequent four segments, from proximal to distal, each segment bearing 0, 1, 2, and 5 plumodenticulate setae, respectively; exopod with a naked proximal segment, and distal segment with 4 long plumose setae; epipod absent.
Maxilliped III (Fig. 3I). Coxa and basis are not clearly differentiated, with 10 plumodenticulate setae; endopod with 5 segments and the segments from proximal to distal with 15, 7, 5, 6, and 5 plumodenticulate setae, respectively; ischium margin shows crista dentate, and distal margin with one acicular process; exopod with two segments, proximal segment naked, distal segment bearing 4 long plumose setae; epipod prolonged into branchial chamber, with 5 long grooming setae.
Thoracic sternum (Fig. 4F). Somites 1–3 fused and form a single plate, with a spade-shape anterior margin and 2 pairs of simple setae on the plate; segment 4 with 3 pairs of simple setae on the anterior margin; subsequent segments naked; posterior margin convex forward.
Pereiopods (Fig. 4 A–E). All pereiopods covered with dense simple setae. Cheliped (pereiopod 1) welldeveloped, dactylus bearing three acicular processes; pereiopod 2 with one acicular process on anterior margin of propodus; pereiopod 3 with one small rounded process on anterior margin of carpus; pereiopod 4 has one lateral acicular process on merus; pereiopod 5 has one small process on anterior margin of carpus and one acicular process on anterior margin of merus.
Pleon (Fig. 4K). With six somites plus telson, dorsal surface of somites 1–6 with 4, 6, 6, 6, 6, and 2 simple setae, respectively; somites 2–5 with functional natatory setose pleopods, and the last somite bearing one pair of uropods.
Pleopods (Fig. 4 G–K). Five pairs, present on somites 2–5 of the pleon; endopod of pleopod 1–4 bearing 3–4 cincinnuli each; exopod of pleopod 1–4 with 13–15, 13, 12–13, and 10–11 long plumose natatory setae, respectively; pleopod 5 (i.e. uropod) reduced, segments fused, with 6 plumose natatory setae in terminal end.
Telson (Fig. 4K). Rectangular, round posteriorly, 1 pair of simple setae dorsally, forming tail fan with uropods.
Crab I
Size: CL = 2.05 ± 0.20 mm; CW = 1.32 ± 0.12 mm. (Number of examined specimens: 5).
Carapace (Fig. 5A). Length longer than width, narrowing anteriorly; two triangular processes posterior to eyes; one rounded tubercle on the middle of dorsal surface; two knob-like protuberances near the border of gastric area; the border of cardiac region and posterolateral margin slightly elevated; surface covered with numerous long simple setae and hooked setae.
Antennule (Fig. 5B). Peduncle three-segmented with 5, 2, 2 plumose setae, respectively; endopod bisegmented, proximal segment naked and distal segment with 3 + 1 setae; exopod bi-segmented, proximal segment bearing 4 aesthetascs and distal segment with 3 aesthetascs plus 1 simple seta.
Antenna (Fig. 5C). Segments 1–8 from proximal to distal has 4, 8, 5, 0, 0, 1, 4, and 3 setae, respectively, all setae are plumose except that 2, 1, 1, and 3 setae on the second, sixth, seventh and last segments are simple.
Mandible (Fig. 5D). Asymmetric; blades are the same as for megalopa except that size has increased; palp bisegmented with 0 and 6 plumodenticulate setae.
Maxillule (Fig. 5E). Basial endite with 14 plumodenticulate setae; endopod unsegmented and naked.
Maxilla (Fig. 5F). Both proximal and distal lobe of basial endite have 5 plumodenticulate setae; Endopod naked and reduced; scaphognathite bearing 41 plumose marginal setae, and 5 plumose setae on the blade.
Maxilliped I (Fig. 5G). Coxa bearing 14 plumodenticulate setae; basis with 18 plumodenticulate setae; endopod reduced, with 2–3 short plumodenticulate setae; exopod bi-segmented, proximal segment naked; distal segment with 5 setae, 1 short, plumodenticulate and 4 long, plumose; epipod triangular and prolonged, with 14 long grooming setae.
Maxilliped II (Fig. 5H). Coxa and basis naked and not differentiated; endopod five-segmented, from proximal to distal, each segment with 0, 1, 1, 5, 6 plumodenticulate setae, respectively, one process presents on the margin of the first segment; exopod with two segments, the proximal segment without setae, and the distal segment bearing 4 long terminal plumose setae; epipod absent.
Maxilliped III (Fig. 6A). Coxa and basis not differentiated, bearing 12 plumodenticulate setae; endopod fivesegmented and from proximal to distal, each segment with 23, 12, 10, 8, 7 plumodenticulate setae, respectively, with crista dentate on the margin of ischium; exopod bi-segmented, the proximal segment with 2 plumodenticulate setae and the distal segment with 4 plumose setae; epipod bearing 3 long simple setae.
Pereiopods (Fig. 5 C–G). Covered with curved simple setae and hooked setae, both density and length of setae increased compared to megalopa; no process present on segments.
Thoracic sternum (Fig. 5B). Somites 1–3 fused and forming a plate, with 10 pairs of simple setae; subsequent segments from proximal to distal bearing 1, 1, 1, and 0 pairs of simple setae, respectively.
Pleon (Fig. 5I). With five somites; from proximal to distal each somite with 6, 8, 8, 2, and 16 simple setae, respectively.
Pleopods (Fig. 5H). Five pairs; reduced and no seta presents.
Telson (Fig. 5I). Triangular, with a rounded posterior margin, bearing 4 simple setae.
description: Published as part of Xu, Tian, Zeng, Chaoshu & Hutson, Kate S., 2019, Morphological descriptions of the larval and first juvenile stages of the decorator crab Camposcia retusa (Latreille, 1829) from laboratory-reared material, pp. 295-315 in Zootaxa 4577 (2) on pages 297-305, DOI: 10.11646/zootaxa.4577.2.4, http://zenodo.org/record/3993570