Tetraxanthus rathbunae Chace, 1939
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publication ID |
https://doi.org/ 10.11646/zootaxa.5174.1.3 |
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publication LSID |
lsid:zoobank.org:pub:FF3FE465-77E3-491D-9632-8C101BAF2A5B |
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DOI |
https://doi.org/10.5281/zenodo.6973118 |
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persistent identifier |
https://treatment.plazi.org/id/022B87BF-7621-FFC4-D795-F9712492FB93 |
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treatment provided by |
Plazi |
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scientific name |
Tetraxanthus rathbunae Chace, 1939 |
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Tetraxanthus rathbunae Chace, 1939 View in CoL
( Fig. 1 View FIGURE 1 )
Measurements of larvae: CL, 0.45 ± 0.03 mm; n = 10.
Carapace ( Fig. 1a View FIGURE 1 ): globose; dorsal spine long, lightly curved backward, without setae; rostral spines shorter than antennal protopod; lateral spines short; anterodorsal and posterodorsal sensory dorsal organs (SDO); 1 pair of posterodorsal, distally simple, setae; sessile eyes.
Antennule ( Fig. 1c View FIGURE 1 ): not articled, with 2 long and 2 shorter and thinner terminal aesthetascs, 1 simple seta; accessory flagellum absent.
Antenna ( Fig. 1d, e View FIGURE 1 ): uniramous; long, well-developed multispinulate protopod; endopod spine present; not articled exopod, with 5 unequal terminal simple setae and 1 lateral simple seta on outer side.
Mandible ( Fig. 1f View FIGURE 1 ): with medial dentate molar process and enlarged lateral incisor process; palp absent.
Maxillule ( Fig. 1g View FIGURE 1 ): coxal endite with 7 (3 subterminal + 4 terminal) plumodenticulate setae; basial endite with 5 plumodenticulate setae; 2-articled endopod, with 1 plumodenticulate seta on proximal articled and 6 (2 subterminal + 4 terminal) plumodenticulate setae.
Maxilla ( Fig. 1h View FIGURE 1 ): coxal endite bilobed, with 4 (3 plumose + 1 plumodenticulate) + 4 (2 plumose + 2 plumodenticulate) setae; bilobed basal endite, with 5 + 4 plumodenticulate setae; bilobed endopod, with 3 plumodenticulate + 5 (4 plumodenticulate + 1 sparsely plumose) setae; scaphognathite with 4 marginal plumose setae and 1 stout posterior process.
First maxilliped ( Fig. 1i View FIGURE 1 ): coxa with 1 simple seta; basis with 10 sparsely plumose setae arranged in 2+2+3+3; 5-articled endopod, with 3 (1 simple seta + 2 sparsely plumose) setae, 2 (1 simple + 1 sparsely plumose) setae, 1 sparsely plumose seta, 2 sparsely plumose setae, and 5 (1 simple + 4 terminal plumodenticulate) setae; 2-articled exopod, with 4 terminal natatory plumose setae.
Second maxilliped ( Fig. 1j View FIGURE 1 ): coxa without setae; basis with 4 medial sparsely plumose setae arranged in 1+1+1+1; 3-articled endopod, with 1 simple seta, 1 plumodenticulate seta, and 6 (2 long and 1 short sparsely plumose + 2 simple + 1 plumodenticulate) setae; not articled exopod with 4 terminal natatory plumose setae.
Third maxilliped: absent.
Pereiopods: absent.
Pleon ( Fig. 1b View FIGURE 1 ): with 5 segments; somites 2–5 with pair of posteromedian simple setae; somites 3–5 with posterolateral processes; somites 2–3 with dorsolateral processes; sixth somite merged with telson; pleopods absent.
Telson ( Fig. 1k View FIGURE 1 ): bifurcated; each furca with 3 lateral spines and 2 simple setae; median shorter than others; inner margins with 3 + 3 stout spinulate setae separated by medial sinus.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.