Diuplax, L. & Castro & Rodríguez & Moreno, 2024
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publication ID |
https://doi.org/ 10.5252/zoosystema2024v46a29 |
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publication LSID |
lsid:zoobank.org:pub:B8FB5A89-4811-4DB1-819B-442067652F3E |
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persistent identifier |
https://treatment.plazi.org/id/03D287C2-7D5F-9C15-2A38-FDA4FA1DF812 |
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treatment provided by |
Plazi |
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scientific name |
Diuplax |
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gen. nov. |
Diuplax n. gen.
urn:lsid:zoobank.org:act:B7C74C46-F929-42E0-9F15-EE160D5266CC
TYPE SPECIES. — Frevillea sigsbei A. Milne-Edwards, 1880 , by present designation.
ETYMOLOGY. — The name is derived from the Latin diutius for “a long time,” in arbitrary combination with “- plax ”, the ending for many goneplacid taxa, alluding to the long time it took to discover the true generic affinities of F. sigsbei . The gender is feminine.
DIAGNOSIS. — Carapace broadly trapezoidal ( Fig. 5A, B, D, F, G View FIG ); anterolateral tooth adjacent to pronounced external orbital tooth, separated by deep cleft ( Figs 5A, B, D, F, G View FIG ; 6A, B View FIG ); posterior margin of epistome relatively wide transversely, margin almost straight ( Fig. 6A, B View FIG ); ocular peduncle relatively short, c. 2 times length of cornea ( Figs 5A, B, D, F, G View FIG ; 6A, B View FIG ); male thoracic sternites 1-4 relatively wide ( Fig. 5E View FIG ); male thoracic sternite 8 visible as triangular plate when pleon closed; pleonal somite 1 reaching coxa of fourth ambulatory leg; episternite 7 partially overlaps episternite 8 in ventral view, penis visible in oblique view, between narrow channel between episternites 7 and 8 ( Fig. 6 View FIG C-E); male pleon relatively narrower transversely, especially somites 3-6 ( Fig. 5E View FIG ); adult male cheliped short, relatively stout ( Fig. 5D, E View FIG ); fourth ambulatory dactylus spatuliform ( Fig. 5A, B, D View FIG ); G1 relatively short, broadly C-shaped, evenly distally tapering gradually to sharp tip, opening subdistal, large ( Fig. 6F, G View FIG ); G2 longer than G1; flagellum long, longer than basal article, distal part strongly recurved ( Fig. 6H, I View FIG ).
REMARKS
The differences between Diuplax n. gen. and Goneplax s. str. are pronounced (see Table 1). Secondary differences observed between Diuplax n. gen. and Goneplax s. str. that may be of generic value are: the cheliped merus of the former is short, stout, dorsal margin of merus possessing a low submedian tubercle ( Fig. 5B View FIG ) (elongated, slender, with a distinct short submedian spine on dorsal margin in Goneplax , Fig. 7F View FIG ); and the dorsal margin of the meri of the ambulatory legs have each show a subdistal angle but is not spiniform ( Fig. 5A, B, D View FIG ) (with a distinct subdistal spine in Goneplax s. str.; Fig. 7G View FIG ).
COMPARATIVE MATERIAL. — Goneplax rhomboides ( Linnaeus, 1758) • 3 ♂ (largest 36.5 × 22.6 mm); Kames Bay, Isle of Cumbray, Scotland; coll. S. De Grave; 2.VI.2005; ZRC 2010.0069 • 1♂ (22.0 × 35.8 mm); Grand Bassam, Abidjan, Ivory Coast, trawl; 250 m; coll. Le Loeuff & Intès; 23.XII.1966 (det. Goneplax angulata ) MNHN- IU-2024-5374 (= MNHN-B19812). Goneplax clevai Guinot & Castro, 2007 • 1♂ (21.3 × 35.3 mm); Port Elizabeth, South Africa; coll. S. Fennessy, from local trawlers; 1.XII.2003; ZRC 2004.0700.
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.