Tethygonium quadricuspis, Just, Jean & Wilson, George D. F., 2007

Just, Jean & Wilson, George D. F., 2007, Revision of Austrosignum Hodgson and Munnogonium George & Strömberg (Paramunnidae) with descriptions of eight new genera and two new species, (Crustacea: Isopoda: Asellota), Zootaxa 1515, pp. 1-29 : 23-24

publication ID	https://doi.org/ 10.5281/zenodo.177291
DOI	https://doi.org/10.5281/zenodo.5684115
persistent identifier	https://treatment.plazi.org/id/03A6878F-FF97-5A4C-FF4A-FBA7FCEFFE13
treatment provided by	Plazi
scientific name	Tethygonium quadricuspis
status	sp. nov.

Treatment

Tethygonium quadricuspis View in CoL sp. nov.

Figs 9–11 View FIGURE 9 View FIGURE 10 View FIGURE 11

Type fixation. Holotype, Ψ, NMV J 20118 View Materials . —Here designated.

Material examined. Holotype. Ψ, 1.0 mm (+ 3 slides), SE Australia, Bass Strait, S of Pt. Hicks, 38°21.90'S 149°20.0'E, 1000 m, WHOI epibenthic sled, G.C.B. Poore et al., 23 July 1986, RV Franklin, stn SLOPE 32, NMV J20118 View Materials .

Description (female). Body width 0.50 length, widest at pereonite 3. Head length 0.62 width; length posterior to eyestalks 1.6 anterior length. Frontal margin without angular lateral margins adjacent to antennae, broadly rounded. Eyestalks vestigial, shaft before apex rounded bump, long axis angling forward at approximately 30° (ocelli not observed).

Pereonites lateral margin 1–3 angular with anterolaterally projecting spine, 4 rounded with small anterior spine, 5–7 rounded; coxae 4-7 visible in dorsal view. Pereonite 1 sagittal length 3.0 pereonites midline length. Pereonite lateral margins 5–7 smooth.

Pleon length 1.40 width in female. Pleonite 1 width 0.75 distance between uropods, length 0.3 width. Pleotelson laterally rounded, lacking inflection between lateral and proximal margins; length in ventral view proximal to pleopod insertion 0.35 total pleotelson length; lateral margin convex, denticulate, with 10–11 denticles per side. Pleotelson posterior margin in female forming 60° angle, set apart from lateral margins by concavity at level of uropods.

Antennula article 1 longer than 2, width subequal to 2, tubular; 3–6 all of subequal length. Antenna article 3 in ventral view tubular, width 0.36 length, distomedial margin with blunt projection, 4 with distolateral anteriorly curved spine, 5 only slightly longer than article 4; flagellum with 7 articles, proximal article subequal to more distal articles.

Pereopod I basis with single spine on lateral margin, length 3.7 width; ischium with 1 posterior and 1 lateral spines; carpus oval, posterior margin with 3 subequal, curved robust setae; propodus narrowing distally to insertion of dactylus. Pereopod VII coxa with single denticle.

Female operculum distal part tapering with concave distolateral margins, width 0.68 length.

Uropods dorsal and directly adjacent to lateral margin of pleotelson.

Size. Single female, 1.0 mm.

Distribution. Bass Strait, south-eastern Australia. 1000m.