Parapontophilus psyllus, Komai, 2008
|
publication ID |
https://doi.org/ 10.5281/zenodo.5393746 |
|
publication LSID |
lsid:zoobank.org:pub:64CFDA2E-D606-4B3D-9A5B-E2FDF9B6974E |
|
persistent identifier |
https://treatment.plazi.org/id/03AEC142-5702-FF81-48BD-FC2124138E05 |
|
treatment provided by |
Marcus |
|
scientific name |
Parapontophilus psyllus |
| status |
sp. nov. |
Parapontophilus psyllus n. sp.
( Figs 28 View FIG ; 29 View FIG )
TYPE MATERIAL. — Holotype: Japan. TV Toyoshiomaru, 2005-04 cruise, stn 6, off Nago, Okinawa Island , Ryukyu Islands , 26°32.90’N, 127°43.94’E, 396-407 m, 22.V.2005, beam trawl, coll. T. Komai, ovig. ♀ 4.6 mm ( CBM-ZC 8762 ). GoogleMaps
Paratypes: Japan. TV Toyoshio-maru, 2002-05 cruise,stn 11, off Nago Bay, Okinawa Island, Ryukyu Islands, 26°32.18’N, 127°43.96’E, 404- 394 m, 27. V.2002, coll. H. Komatsu, 5 ♂♂ 3.7-3.8 mm, 11 ovig. ♀♀ 3.7-4.0 mm ( CBM-ZC 8028). — Same data as holotype, 7 ♂♂ 3.7-3.9 mm, 6 ovig. ♀♀ 3.7-4.2 mm ( CBM-ZC 8763).
Taiwan. TAIWAN 2001, stn CC 63, 24°55.05’N, 122°03.20’E, 240-350 m, 5. V.2001, 1 ♀ 4.2 mm ( NTOU).
OTHER MATERIAL EXAMINED. — Philippines. MUSORSTOM 1, stn CP 20, 13°59.2’S, 120°20,3’E, 208-222 m, 21.III.1976, 1 ovig. ♀ 4.2 mm (MNHN-Na 16075).
Solomon Islands. SALOMON 1, stn CP 1860, 09°22’S, 160°31’E, 620 m, 7.X.2001, 1 ♂ 3.9 mm (MNHN-Na 16079).
ETYMOLOGY. — From the Greek psyllus , flea, in reference to the small size of this new species. The name is considered as a substantive in apposition.
DISTRIBUTION. — Ryukyu Islands, Taiwan, the Philippines and Solomon Islands ( Fig. 36 View FIG ), 208- 620 m.
DESCRIPTION
Rostrum ( Fig. 28 View FIG A-C) narrow triangular in dorsal view, 0.15-0.18 of carapace length, directed forward, straight, slightly falling short of distal margins of corneas, but slightly overreaching tips of antennal teeth; lateral margins always armed with 1 pair of small to tiny teeth arising at about midlength of rostrum. Carapace ( Fig. 28A, B, D View FIG ) 1.30-1.40 times longer than wide; anterior epigastric tooth greatly reduced to minute denticle or absent; posterior epigastric tooth small, supported by blunt middorsal ridge reaching beyond midlength of carapace; cardiac tooth absent; postorbital tooth reduced to minute tubercle or absent; epibranchial tooth absent; epibranchial ridge obsolete or absent; branchiostegal tooth small, not reaching dorsodistal margin of antennal basicerite.
Third pleonal somite ( Fig. 28E View FIG ) with moderately convex tergum and with moderately produced posterodorsal margin. Fifth somite ( Fig. 28E, F View FIG ) round- ed dorsally. Sixth somite ( Fig. 28E, F View FIG ) 2.90-3.00 times longer than wide, 2.20-2.50 times longer than deep, 2.00-2.20 length of fifth somite; dorsal surface rounded.
Ophthalmic appendage ( Fig. 28A View FIG ) subpyriform; cornea pigmented with light brown or gray in preservative; corneal surface distinctly faceted with moderately small lenses; maximal diameter of cornea 0.15-0.17 of carapace length; eye-stalk constricted near base; mesial face without papilla-like projection. Antennular peduncle ( Fig. 28A View FIG ) reaching midlength of antennal scale. Antennal scale ( Fig. 28A View FIG ) about 0.60-0.65 of carapace length and 2.72-2.90 times longer than wide; lateral margin nearly straight or slightly concave, lamella strongly produced, distinctly overreaching distolateral tooth.
Palm of first pereopod ( Fig. 29A, B View FIG ) 3.10-3.40 times longer than wide; pollex moderately produced, width including tip of pollex about 1.30 of width of palm proper; cutting edge moderately oblique; merus with relatively weak dorsodistal tooth. Second pereopod ( Fig. 29C View FIG ) relatively long for genus, overreaching midlength of merus of first
D
A pereopod. Fourth pereopod ( Fig. 29E View FIG ) overreaching distal margin of antennal scale by half to full length of dactylus; dactylus elongate, subspatulate, 0.80-0.95 of propodal length; carpus 0.50-0.65 of propodal length. Fifth pereopod similar to fourth, slightly falling short of distal margin of antennal scale. Appendix masculina of male second pleopod ( Fig. 29F View FIG ) 0.85-0.90 length of appendix interna.
Coloration in life
Body entirely light reddish-brown; corneas dark gray (based on field note by the author).
Size
Males CL 3.7-3.9 mm; females CL 3.7-4.6 mm, ovigerous females CL 3.7-4.6 mm.
REMARKS
In P. psyllus n. sp., the size of the branchiostegal tooth of the carapace seems to be different between male and female. In males, this tooth nearly reaches the dorsodistal margin of the antennal basicerite, whereas in females, it falls short of that.
This new species is characteristic within the species group in the possession of only one pair of lateral teeth on the rostrum, rather than two pairs in the other species of the group ( Table 2). Furthermore, in P. psyllus n. sp., the anterior epigastric tooth is absent or rudimentary and the postorbital tooth is absent. In the other species of the group, the anterior epigastric and postorbital teeth are conspicuous, although the sizes of these teeth are different according to species.
| TV |
Centro de Estratigrafia e Paleobiologia da Universidade Nova de Lisboa |
| T |
Tavera, Department of Geology and Geophysics |
| V |
Royal British Columbia Museum - Herbarium |
| CC |
CSIRO Canberra Rhizobium Collection |
| NTOU |
Institute of Marine Biology, National Taiwan Ocean University |
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.