Libinia rhomboidea Streets, 1870
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publication ID |
https://doi.org/10.1590/2358-2936e2020032 |
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persistent identifier |
https://treatment.plazi.org/id/03D48794-FF9C-FFED-BB49-9041FAFEFE92 |
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treatment provided by |
Felipe |
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scientific name |
Libinia rhomboidea Streets, 1870 |
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Libinia rhomboidea Streets, 1870 View in CoL Synonymy. Libinia inflata Streets, 1870
First zoea ( Figs. 1 View Figure 1 , 2 View Figure 2 )
Size. TL= 2.71 ± 0.02 mm; CL = 0.83 ± 0.02 mm; CW 0.70 ± 0.01 mm; DL = 0.50 ± 0.01 mm; RL = 0.10 ± 0.01 mm; RDL = 1.45 ± 0.01 mm.
Cephalothorax ( Fig. 1A, B View Figure 1 ). Spherical, dorsal spine well developed, rostral spine length shorter than the length of the antenna curved towards the ventral margin, without lateral spines. One pair of setae between the dorsal spine and the eyes. A pair of plumose setae at the antero-ventral margin and three setae at the postero-ventral margin. Eyes sessile.
Pleon ( Fig. 1A, C View Figure 1 ). Five pleonites; pleonite 2, with dorsolateral processes; pleonites 3 –5 with short lateral processes; pleonites 2 – 5 with a pair of posterodorsal setae. Telson bifurcated, posterior margin with 3 pairs of serrulate setae. Furcae only with lateral spines.
Pleopods ( Fig. 1C View Figure 1 ). Absent.
Antennule ( Figs. 1A, D View Figure 1 ). Uniramous. Endopod absent. Exopod unsegmented with 4 terminal aesthetascs (2 long and 2 smaller) and 1 short simple terminal seta.
Antenna ( Fig. 1A, E View Figure 1 ). Biramous. Protopod well developed, spinous process armed with strong spines arranged in two lines. Endopod bud medially on protopod. Exopod bud elongated and tapering to a point, 2 subterminal spines shorter than protopod.
Mandible ( Fig. 1F View Figure 1 ). Antero-ventral margin with 5 teeth; 1 tooth on postero-median margin. Palp absent.
Maxillule ( Fig. 2A View Figure 2 ). Coxal endite with seven (five terminal and two subterminal) sparsely plumose setae. Basial endite with 5 sparsely plumose terminal setae and 2 plumodenticulate subterminal setae. Endopod 2-segmented, proximal segment with one sparsely plumose seta, distal segment with 5 sparsely plumose terminal setae.
Maxilla ( Fig. 2B View Figure 2 ). Coxal endite bilobed with 4 + 3 plumose setae. Basial endite bilobed with 5 + 4 sparsely plumose setae. Endopod unsegmented, with 4 sparsely plumose terminal setae and microtrichia on external margins. Scaphognathite with 9 plumose marginal setae and a plumose apical tip.
First maxilliped ( Fig. 2C View Figure 2 ). Coxa without setae. Basis with 9 mesial sparsely plumose setae arranged 2+2+3+3 (proximal to distal). Endopod 5-segmented with 3, 2, 1, 2, 5 sparsely plumose setae. Exopod 2-segmented, distal segment 4 long plumose, natatory, terminal setae.
Second maxilliped ( Fig. 2D View Figure 2 ). Coxa without setae. Basis 3 long sparsely plumose setae arranged 1+1+1. Endopod 3-segmented, 0, 1, 4 sparsely plumose setae. Exopod 2-segmented, 4 long plumose, natatory, terminal setae.
Third maxilliped ( Fig. 1A View Figure 1 ). Rudimentary.
Pereiopods ( Fig. 1A View Figure 1 ). Rudimentary.
Second zoea ( Figs. 3 View Figure 3 , 4 View Figure 4 )
Size: TL = 2.92 ± 0.09 mm; CL = 1.07 ± 0.05 mm; CW = 0.93 ± 0.05 mm; DL = 0.53 ± 0.02 mm; RL 0.27 ± 0.02 mm; RDL = 1.61 ± 0.05 mm.
Cephalothorax ( Fig. 3A, B View Figure 3 ). Size similar to that of former stage; 3 plumose setae at the antero-ventral margin and 3 plumose setae at the postero-ventral margin. Eyes stalked.
Pleon ( Fig. 3A, C View Figure 3 ). Six somites. Somite 2 with pair of dorsolateral processes. Somites 2 – 5 with 2 pleopod buds ventrally.Abdominal somite 6 separated from telson and without postero-lateral spines. Telson bifurcated, posterior margin with 3 pairs of spinulate setae. Furcae with only lateral spines.
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