Ozius guttatus H. Milne Edwards, 1834

Clark, Paul F. & Ng, Peter K. L., 2025, The abbreviated larval development of Ozius guttatus H. Milne Edwards, 1834 (Crustacea: Brachyura: Eriphioidea: Oziidae), Zootaxa 5575 (1), pp. 57-86 : 59-75

publication ID	https://doi.org/10.11646/zootaxa.5575.1.2
publication LSID	lsid:zoobank.org:pub:0FA08737-48A9-4EA9-A63A-A0BDDD7D6485
DOI	https://doi.org/10.5281/zenodo.14746502
persistent identifier	https://treatment.plazi.org/id/A71687B0-2F3C-FFDA-FF74-FB5AFE0FF8DD
treatment provided by	Plazi
scientific name	Ozius guttatus H. Milne Edwards, 1834
status

Treatment

Ozius guttatus H. Milne Edwards, 1834 View in CoL

( Figs. 1–17 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURE 11 View FIGURE 12 View FIGURE 13 View FIGURE 14 View FIGURE 15 View FIGURE 16 View FIGURE 17 )

ZOEA I

CEPHALON

CARAPACE ( Figs. 1 View FIGURE 1 , 4a View FIGURE 4 ): dorsal spine curved distally, longer than rostral spine; rostral spine much longer than antennal protopod and without distal spinulation; lateral spines curved ventrally and without spinulation on dorsal margin; 1 pair of anterodorsal setae; 1 pair of posterodorsal setae; ventral margin with 2 anterior plumose setae (soie antérieure) and ca. 9 posterior setae.

EYES ( Fig. 1 View FIGURE 1 ): sessile.

ANTENNULE ( Figs. 1 View FIGURE 1 , 4c View FIGURE 4 ): undifferentiated, primary flagellum represented by 4 (2 broad, 2 slender) terminal aesthetascs of unequal length plus 1 terminal seta; accessory flagellum absent.

ANTENNA ( Figs. 1 View FIGURE 1 , 5a View FIGURE 5 ): biramous; protopodal process almost reaching tip of rostral spine; endopod present, more than 50% length of protopod and shorter that exopod; exopod present ca. 50% length of protopod, possessing 3 (1 long subterminal+2 terminal of unequal length) setae.

MANDIBLE: palp absent.

MAXILLULE ( Fig. 6a View FIGURE 6 ): biramous; epipod seta absent; coxal endite with 10 setae; basial endite with 6 setal processes and 2 small setal buds; endopod comprising 2 articles, proximal article with 1 seta; distal article with 6 (2 subterminal+4 terminal) setae; exopod seta present.

MAXILLA ( Fig. 7a View FIGURE 7 ): biramous; coxal endite bilobed with 7+4 setae; basial endite bilobed with 5+4 setae; endopod bilobed, with 3+5 (2 subterminal+3 terminal) setae; exopod (scaphognathite) with ca. 14 marginal setae and 1 long distal stout process.

PEREION

FIRST MAXILLIPED ( Fig. 8a View FIGURE 8 ): biramous; coxa with 2 setae, epipod present with developing podobranch gill; basis with 10 (2+2+3+3) setae; endopod comprising 5 articles with 3,2,1,2,5 (1 subterminal+4 terminal) setae respectively; exopod comprising 2 articles, distal article with 4 long terminal plumose natatory setae.

SECOND MAXILLIPED ( Fig. 9a View FIGURE 9 ): biramous; coxa with 1 seta, epipod present; basis with 4 (1+1+1+1) setae; endopod comprising 3 articles, with 1,1,6 (3 subterminal+3 terminal) setae respectively; exopod comprising 2 articles, distal article with 4 long terminal plumose natatory setae.

THIRD MAXILLIPED: ( Fig. 10a View FIGURE 10 ): biramous; endopod longer than exopod, articles not differentiated; exopod present and not differentiated; epipod present.

PEREIOPODS: ( Fig. 11c View FIGURE 11 ): present; chela bilobed; gill buds present on first 4 pereiopods.

PLEON ( Fig. 13a View FIGURE 13 , 14a View FIGURE 14 ): 5 pleomeres; pleomere 2 with 1 pair of dorsolateral processes directed anteriorly; pleomere 3–5 with 1 pair of dorsolateral processes directed posteriorly; pleomere 1 with median dorsal process and 5 dorsomedial setae; pleomeres 1–2 each with rounded posterolateral processes and 3–5 each with short posterolateral spine; pleomeres 2–5 each with 1 pair of posterodorsal setae; pleopod buds present, on pleomeres 2–5, undifferentiated, with endopods absent.

TELSON ( Figs. 13a View FIGURE 13 , 14a View FIGURE 14 , 17a View FIGURE 17 ): each fork long, gradually curved distally and not spinulate with 1 large and 1 small lateral spine, dorsomedial spine present; posterior margin with 3 pairs of stout spinulate setae 1 pair of small medial setae, sometime with 3 medial setae.

ZOEA II

CEPHALON

CARAPACE ( Figs. 2 View FIGURE 2 , 4b View FIGURE 4 ): 2 pairs of anterodorsal setae; otherwise unchanged.

EYES ( Fig. 2 View FIGURE 2 ): now stalked.

ANTENNULE ( Figs. 2 View FIGURE 2 , 4d View FIGURE 4 ): primary flagellum with 2 medial marginal setae, 6 proximal subterminal aesthetascs; 5 medial subterminal aesthetascs; 11 (7 broad, 4 slender) terminal aesthetascs of unequal length plus 1 terminal seta; accessory flagellum now present as a bud.

ANTENNA ( Figs. 2 View FIGURE 2 , 5b View FIGURE 5 ): endopod more developed and extended to just shorter than length of protopod, but longer than exopod; otherwise unchanged.

MANDIBLE ( Fig. 11a View FIGURE 11 ): palp now present.

MAXILLULE ( Fig. 6b View FIGURE 6 ): epipod seta now present; coxal endite with 11 setae; basial endite with 12 setal processes; exopod now with 2 setae present; otherwise unchanged.

MAXILLA ( Fig. 7b View FIGURE 7 ): coxal endite bilobed with 8+4 setae; basial endite bilobed with 5+7 setae; exopod (scaphognathite) with ca. 34 marginal setae now all the same length.

PEREION

FIRST MAXILLIPED ( Fig. 8b View FIGURE 8 ): coxal epipod podobranchial gill more developed; endopod terminal article 5 now with 6 (2 subterminal+4 terminal) setae; exopod distal article with 6 long terminal plumose natatory setae; otherwise unchanged.

SECOND MAXILLIPED ( Fig. 9b View FIGURE 9 ): coxal epipod propodal gill more developed; exopod distal article with 6 long terminal plumose natatory setae; otherwise unchanged.

THIRD MAXILLIPED: ( Fig. 10b View FIGURE 10 ): endopod differentiated into 5 articles; exopod rudimentary differentiated into 2 articles, distal article with 2 terminal spines; epipod more developed with podobranchial gill bud developed.

PEREIOPODS: ( Fig. 11d View FIGURE 11 ): pereiopods now articlated.

PLEON ( Fig. 13b View FIGURE 13 , 14b View FIGURE 14 , 16a, c, e, g, i View FIGURE 16 ): 6 pleomeres; pleomere 6 without setation; pleopods present on pleomeres 2–5, protopod undifferentiated, endopods present; exopod with 1 article, pleomere 6 with an undifferentiated uropod article; otherwise unchanged.

TELSON ( Figs. 13b View FIGURE 13 , 14b View FIGURE 14 , 17b View FIGURE 17 ): posterior margin now with 2 pairs of small medial setae, sometimes 5 medial setae; otherwise unchanged.

MEGALOP

CEPHALON

CARAPACE ( Figs. 3 View FIGURE 3 ): rostrum absent; setation as illustrated.

EYES ( Fig. 3 View FIGURE 3 ): stalked.

ANTENNULE ( Fig. 4e View FIGURE 4 ): peduncle comprising 3 articles with 5,3,0 setae respectively; primary flagellum 4 articles, proximal with 2 rows of aesthetascs, 3+5; article 2 with 5 aesthetascs; article 3 with 3 aesthetascs; distal article with long terminal seta; accessory flagellum with 2 subterminal and 2 terminal setae.

ANTENNA ( Fig. 5c View FIGURE 5 ): uniramous; coxa with a distal process and 2 setae, basis with 1 distal seta, endopod: ischium with 2 distal setae, merus annulated with 0+2 setae respectively, carpus annulated with 0+5 setae respectively, propodus with 3 distal setae and dactylus with 5 distal setae.

MANDIBLE ( Fig. 11b View FIGURE 11 ): palp now with 3 articles comprising a basis from which originates endopod with 2 articles, proximal article without setae, distal article with 10 marginal setae.

MAXILLULE ( Fig. 6b View FIGURE 6 ): coxal endite with 17 setae; basial endite with 18 setal processes; endopod comprising 2 articles, proximal article with 1 distal setae, distal article with 1 subterminal and 1 terminal seta; exopod now with 1 seta present.

MAXILLA ( Fig. 7b View FIGURE 7 ): coxal endite bilobed with 14+7 setae; basial endite bilobed with 7+8 setae; endopod reduced with 2 basal setae; exopod (scaphognathite) margin with ca. 53 setae and 3 pairs of lateral setae.

PEREION

FIRST MAXILLIPED ( Fig. 8c View FIGURE 8 ): protopod not differentiated into coxa and basis with 1 distal seta, epipod well developed with 6 long distal setae and podobranchial gill well developed; endopod comprising 5 articles with 2,5,2,6,3 setae respectively, terminal article with additional 5 marginal spinulated spines; exopod comprising 2 articles, distal article with 4 long plumose setae.

SECOND MAXILLIPED ( Fig. 9c View FIGURE 9 ): protopod undifferentiated into coxa and basis; coxal endite with 13 setae, epipod well developed with 4 long setae; basial endite with 20 setae; endopod undifferentiated with 1 proximal seta and 3 terminal setae; exopod comprising 2 articles, proximal article with 1+3 setae, distal article with 4 long plumose setae.

THIRD MAXILLIPED: ( Fig. 10c View FIGURE 10 ): protopod undifferentiated into coxa and basis, with ca. 25 setae, epipod well developed with podobranchial gill and 17 long setae; endopod differentiated into 5 articles, ischium with ca. 23 setae and 5 marginal teeth, merus with 15 setae, carpus with 12 setae, propodus with 10 setae, dactylus with 7 setae; exopod comprising 2 articles, proximal article with 4 marginal setae, distal article with 4 long plumose setae.

PEREIOPODS: ( Fig. 12a–e View FIGURE 12 ): presence of gills only in chela and pereiopod 2; 3 long setae on dactylus of pereiopod 5; setation as figured.

PLEON ( Fig. 15a, b View FIGURE 15 , 16b, d, f, h, j View FIGURE 16 ): 6 pleomeres; pleomere 1 with 6 medial setae and 3 setae on each lateral margin; pleomere 2 with 2 medial setae, 6 posterior marginal setae and 2 setae on each lateral margin; pleomere 3 with 2 pairs of medial setae, 6 posterior marginal setae and 2 setae on each lateral margin; pleomere 4 with 2 pairs of medial setae, 6 posterior marginal setae and 2 setae on each lateral margin; pleomere 5 with 2 pairs of medial setae, 6 posterior marginal setae and 2 setae on each lateral margin; pleomere 6 with 4 posterior marginal setae and 2 setae on each lateral margin; pleopods present on pleomeres 2–5, protopod undifferentiated into coxa and basis, endopod present; exopod with 1 article, exopod of pleopod 2 endopod with 3 inner cincinuli, exopod with 1 inner proximal seta and 18 marginal plumose natatory setae, pleopod 3 endopod with 4 inner cincinuli, exopod with 1 inner proximal seta and 18 marginal plumose natatory setae, pleopod 4 endopod with 3 inner cincinuli, exopod with 2 proximal seta and 14 marginal plumose natatory setae, pleopod 5 endopod with 3 inner cincinuli, exopod with 2 proximal seta and 12 marginal plumose natatory setae; pleomere 6, pleopod (uropod) present, protopod undifferentiated into coxa and basis, with 1 outer medial seta; endopod absent, exopod with 1 article and 9 marginal plumose natatory setae.

TELSON ( Figs. 15a, b View FIGURE 15 , 17c, d View FIGURE 17 ): without forks, 1 pair of lateral marginal setae, 1 pair of dorsal and ventral setae, 6 posterior marginal setae.