Pseudopontophilus serratus Komai, 2004

Komai, Tomoyuki, Ohtsuka, Susumu, Yamaguchi, Shuhei & Nakaguchi, Kazumitsu, 2018, New records of six deep-sea caridean shrimps (Crustacea: Decapoda) from the Ryukyu Islands and its adjacent waters, southwestern Japan, Zootaxa 4457 (1), pp. 114-128: 116-117

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Pseudopontophilus serratus Komai, 2004


Pseudopontophilus serratus Komai, 2004 

[New Japanese name: Nokogiri-shinkai-ebi-jyako]

Figs. 2 View Figure , 3 View Figure

Pseudopontophilus serratus Komai, 2004: 76  , figs. 1–6 [type locality: New Caledonia, 510 m].— De Grave & Fransen 2011: 465.

Material examined. T/RV “Toyoshio-maru”, 2009-3 cruise, stn 11, W of Amami-oshima Island, 28°23.93’N, 129°13.55’E, 623–635 m, 23 May 2009, sledge net, coll. T. Komai, 2 males (cl 4.1, 5.8 mm), 7 females (cl 4.0– 4.9 mm), CBM-ZC 11092.

Colouration in fresh condition ( Fig. 2 View Figure ). Body covered with orange-brown chromatophores, more numerous on carapace, much fewer on pleon. Corneas grayish. Antennal scale mottled with white and orange-brown. Pereopod 1 generally semi-transparent, distally orange-brown on palm. Pereopods 4 semi-transparent, with tinge of red proximally on merus and ischium. Pereopod 5 entirely semi-transparent. Telson and uropods with scattered orange-brown spots on transparent background.

Distribution. Previously known from New Caledonia, Vanuatu, Fiji and Tonga, at depths of 235–650 m ( Komai, 2004). The present specimens greatly extend the geographical range of this species to the west and north.

Remarks. The genus Pseudopontophilus Komai, 2004  is represented only by its type species, P. serratus Komai, 2004  , which is known from the South-West Pacific localities, including New Caledonia, Vanuatu, Fiji and Tonga. Diagnostic characters of Pseudopontophilus  include the pair of lateral teeth on the rostrum ( Fig. 3B View Figure ), one to four spines on the dorsal midline of the carapace aligned with the epigastric spine ( Fig. 3A, B View Figure ), a longitudinal row of three spines on the postorbital ridge on the carapace ( Fig. 3A, B View Figure ), one or two spines posterior to the hepatic spine ( Fig. 3A, B View Figure ), dorsally rounded pleomeres 1–6 ( Fig. 2B View Figure ) and short, but chelate pereopod 2 with fingers distinctly longer than the palm ( Fig. 3C View Figure ) ( Komai, 2004). The present specimens agree well with the type description of the species (cf. Komai, 2004) and represent the second record of the species since the original description.

One of the female specimens (cl 4.9 mm) carries an unidentified bopyrid isopod under the pleomeres 1 and 2.














Pseudopontophilus serratus Komai, 2004

Komai, Tomoyuki, Ohtsuka, Susumu, Yamaguchi, Shuhei & Nakaguchi, Kazumitsu 2018


Pseudopontophilus serratus

: 76 : 465