Metacrangon clevai Komai, 2012

Komai, Tomoyuki & Chan, Tin-Yam, 2020, New records of the crangonid shrimp genus Metacrangon Zarenkov, 1965 (Decapoda: Caridea), from the south of Java, eastern Indian Ocean, with description of a new species, Raffles Bulletin of Zoology 68, pp. 326-333 : 330

Metacrangon clevai Komai, 2012

( Figs. 3 , 4B )

Metacrangon clevai Komai, 2012: 34 , figs. 16–18, 43 (type locality: Solomon Islands, 1,001–1,012 m).

Material examined. 1 female (cl 7.4 mm), SJADES, stn DW 32, S of Java, 07°42.58′S, 107°34.54′E to 07°42.56′S, 107°35.93′E, 977– 805 m, 29 March 2018, dredge, ZRC 2019.1872 .

Colouration in life. Body generally maroon; cornea reflective; antennular and antennal peduncles also brownish; maxilliped 3 antepenultimate article brownish, distal two articles paler; pereopod 1 generally pale brown, darker at subdistal part of palm; pereopods 2–5 generally semitransparent, with tinge of brown on ischium and merus of pereopod 4. Pleopods also semitransparent with tinge of brown on protopods.

Distribution. Previously only known from the Solomon Islands and Vanuatu, at depths of 777–1,040 m. Newly recorded from south of Java, Indonesia, at depths of 805– 977 m.

Remarks. The present specimen from the south of Java generally agrees with the description of Metacrangon clevai in the following diagnostic features (see Komai, 2012): (1) the carapace has two middorsal spines, the anterior one located in an epigastric position; (2) there are no submedian spines on the gastric region of the carapace; and (3) the pleomeres 2–4 possess an obsolescent middorsal carina. Only minor differences are observed between this Java specimen and the type material: (1) the anterior middorsal spine on the carapace is relatively longer and narrower in the present specimen than in the type specimens ( Fig. 3A ; Komai, 2012: figs. 16B, 18A); and (2) the posterior middorsal spine arises slightly anterior to the midlength in the newly collected specimen ( Fig. 3A ), whereas in the type specimens, it rises at the midlength or slightly posterior to it ( Komai, 2012: figs. 16B, 18A).

Figures

Fig. 3. Metacrangon clevai Komai, 2012, female (cl 7.4 mm), ZRC 2019.1872. A, carapace, lateral view; B, carapace and cephalic appendages, dorsal view.

Fig. 4. Habitus in lateral view, showing colouration in life. A, Metacrangon latirostris, new species, holotype, female (cl 9.4 mm), MZB Cru 5054; B, M. clevai Komai, 2012, female (cl 7.4 mm), ZRC 2019.1872; C, M. punctata Komai, 2012, ovigerous female (cl 12.9 mm), ZRC 2019.1873; D, same species, ovigerous female (cl 12.5 mm), ZRC 2019.1874; E, same species, male (cl 7.5 mm), ZRC 2019.1874.