Lophoplax sordida, Ng & Rahayu, 2023

Ng, Peter K. L. & Rahayu, Dwi Listyo, 2023, Review of the pilumnid crab genus Lophoplax Tesch, 1918 from the western Pacific, with descriptions of two new species, and the clarification of the identity of Pseudocryptocoeloma parvus Ward, 1936 (Crustacea: Brachyura), Zootaxa 5244 (5), pp. 428-454 : 436-437

publication ID	https://doi.org/ 10.11646/zootaxa.5244.5.2
publication LSID	lsid:zoobank.org:pub:B55396DA-15DB-4CDF-81FD-78686A0EC3A2
DOI	https://doi.org/10.5281/zenodo.7663758
persistent identifier	https://treatment.plazi.org/id/039087CD-7E0D-7321-47C6-FC17F256FE2F
treatment provided by	Plazi
scientific name	Lophoplax sordida
status	sp. nov.

Treatment

Lophoplax sordida View in CoL n. sp.

( Figs. 1C View FIGURE 1 , 2C, D View FIGURE 2 , 3D–F View FIGURE 3 , 5C, I View FIGURE 5 , 6C View FIGURE 6 , 7C, I View FIGURE 7 , 9E View FIGURE 9 , 10F–J View FIGURE 10 )

Type material. Holotype: male (8.2 × 6.5 mm) ( MZB Cru 5449), Kecinan, Lombok, Indonesia, coll. D.L. Rahayu, 9 June 2009 . Paratypes: 2 males (4.2 × 3.3 mm, 6.1 × 4.8 mm) ( ZRC 2022.91 View Materials ), Nara , Lombok, Indonesia, coll. D.L. Rahayu, 14 June 2007 ; 1 male (7.0 × 6.1 mm) ( ZRC 2022.718 View Materials ), Tanjung Aan , Kuta, Lombok, Indonesia, coll. D.L. Rahayu, 15 May 2014 ; 1 male (6.5 × 5.6 mm) ( MZB Cru 5450), Teluk Nara, Lombok, Indonesia, coll. D.L. Rahayu, 14 June 2007 . Others : 1 male (7.0 × 6.2 mm) ( ZRC 2022.720 View Materials ), Tanjung Merah , Bitung, North Sulawesi, Indonesia, coll. La Pay, 30 March 2003 .

Diagnosis. Carapace subquadrate ( Fig. 3D–E View FIGURE 3 ); epigastric, hepatic, cardiac and intestinal areolets glabrous, prominent, smooth or almost so; epigastric areolets relatively wide, ovate, not fused with protogastric areolets ( Fig. 3D–E View FIGURE 3 ); protogastric areolet relatively lower, sometimes covered with setae ( Fig. 3D–E View FIGURE 3 ); cardiac areolet transverse in position ( Fig. 3D–E View FIGURE 3 ); hepatic areolet swollen, prominent, proportionately short, reaching only to base of first anterolateral tooth ( Fig. 3D–E View FIGURE 3 ); external orbital tooth triangular with sharp tip, relatively wide ( Fig. 3D–E View FIGURE 3 ); tips of anterolateral teeth sharply pointed ( Fig. 3C, D View FIGURE 3 ); junction between antero- and posterolateral margins demarcated by low sharply pointed or rounded tooth, with low lobe just posterior to it ( Figs. 3D–E View FIGURE 3 ); epistome relatively wider longitudinally ( Fig. 5C View FIGURE 5 ); median lobe of posterior margin of the epistome broadly triangular, with lateral margins deeply concave ( Fig. 5C View FIGURE 5 ). Third maxilliped with merus quadrate, ischium subrectangular ( Fig. 5I View FIGURE 5 ). Dorsal and lateral surfaces of cheliped carpus with 5 distinct smooth tubercles ( Fig. 6C View FIGURE 6 ); cheliped fingers not distinctly bent, pollex subparallel with ventral margin of palm ( Fig. 7C View FIGURE 7 ). P2–P5 not elongate ( Figs. 2C, D View FIGURE 2 , 7I View FIGURE 7 ); outer surface of P3–P5 merus, carpus and propodus relatively smooth to slightly rugose, and with median longitudinal swelling ( Fig. 7I View FIGURE 7 ). Male pleonal somites 4–6 transversely narrow, telson wider than long, semicircular in shape ( Figs. 9E View FIGURE 9 , 10F View FIGURE 10 ). G1 strongly sinuous, distal part relatively shorter, distinctly hooked ( Fig. 10G–I View FIGURE 10 ).

Colour in life. Carapace and pereopods mostly white, but covered with brown setae; epigastric areolets pale red; protogastric and hepatic areolets pale orange ( Fig. 1C View FIGURE 1 ).

Etymology. The name is derived from the Latin “sordidus” for dirty, alluding to the general appearance of the species, even after cleaning.

Remarks. Lophoplax sordida n. sp. differs from L. scuplta in that the protogastric areolet is distinctly ovate, relatively lower and can be covered with setae ( Fig. 3D–E View FIGURE 3 ) (versus more prominent, clearly defined, glabrous and ovate to subcrescentic in shape; Fig. 3A–C View FIGURE 3 ); the external orbital tooth is relatively wider ( Fig. 3D–E View FIGURE 3 ) (versus narrower; Fig. 3A–C View FIGURE 3 ); the junction between the antero- and posterolateral margins of the carapace is demarcated by a low sharply pointed or rounded tooth, with a low lobe posterior to it ( Fig. 3D–E View FIGURE 3 ) (versus junction with two large rounded to subtruncate tubercles with the tips rounded to flattened, often with median depression; Figs. 3A–C View FIGURE 3 , 9A View FIGURE 9 ); the male telson is relatively shorter, being wider than long and more semicircular in shape ( Fig. 10F View FIGURE 10 ) (versus telson longer and more triangular; Fig. 10A View FIGURE 10 ); and the G1 distal part is shorter and distinctly hooked ( Fig. 10G–I View FIGURE 10 ) (versus distal part longer and gently curved; Fig. 10B–D View FIGURE 10 ).

Two of the paratype males are smaller than the holotype male, differing mainly in having the areolets slightly less prominent, and the setae on the carapace and pereopods being less dense, the setae being longer and simpler, not appearing spongy ( Fig. 3D View FIGURE 3 ). The armature of the various body parts, however, is the same.

Habitat. All the specimens were collected from intertidal reef habitats under rocks.

Distribution. Known from the type locality (Lombok Island), and Bitung, North Sulawesi, Indonesia.