Lissosabinea unispinosa, Komai, 2006
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publication ID |
https://doi.org/ 10.5281/zenodo.5753861 |
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persistent identifier |
https://treatment.plazi.org/id/D35B0625-FFA4-0D6C-FF2A-FD24DE50FA19 |
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treatment provided by |
Marcus |
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scientific name |
Lissosabinea unispinosa |
| status |
sp. nov. |
Lissosabinea unispinosa View in CoL n. sp.
( Figs 13-16 View FIG View FIG View FIG View FIG )
HOLOTYPE. — MUSORSTOM 4, stn 195, 18°54.8’S, 163°22.2’E, 465 m, 19.IX.1985, ovigerous ♀ cl 4.5 mm (MNHN-Na 15161).
PARATYPES. — New Caledonia. MUSORSTOM 4, stn DW 162, 18°35.0’S, 163°10.3’E, 525 m, 16.IX.1985, 1 ovigerous ♀ cl 4.8 mm (MNHN-Na 15162). — Stn CP 170, 18°57.0’S, 163°12.6’E, 480 m, 17.IX.1985, 1 ovigerous ♀ cl 4.6 mm (MNHN-Na 15163). — Stn CP 180, 18°56.8’S, 163°17.7’E, 440 m, 18.IX.1985, 1 ♂ cl 4.3 mm (MNHN-Na 15164). — Stn 195, 18°54.8’S, 163°22.2’E, 465 m, 19.IX.1985, 2 ovigerous ♀♀ cl 4.6, 5.0 mm, 1 cephalothorax cl 5.1 mm (sex could not be determined) (MNHN-Na 15165). — Stn DW 196, 18°55.0’S, 163°23.7’E, 450 m, 20.IX.1985, 1 ovigerous ♀ cl 4.4 mm (MNHN-Na 15166). — Stn DW 222, 22°57.6’S, 167°33.0’E, 410-440 m, 30.IX.1985, 1 ovigerous ♀ cl 4.1 mm (MNHN-Na 15167).
BIOCAL, stn DW 44, 22°47’S, 167°14’E, 440-450 m, 30.VIII.1985, 1 ♀ cl 5.0 mm (MNHN-Na 15168). — Stn CP 45, 22°47’S, 167°15’E, 430-465 m, 30.VIII.1985, 1 ♂ cl 4.1 mm, 2 ovigerous ♀♀ cl 4.3, 4.5 mm (CBM- ZC 8341). — Stn CP 78, 22°16’S, 167°15’E, 445- 450 m, 5.IX.1985, 1 ♀ cl 4.3 mm, 2 ovigerous ♀♀ cl 4.7 mm, crushed (MNHN-Na 15169). — Stn DW 81, 20°29’S, 166°47’E, 430-470 m, 5.IX.1985, 1 ♀ cl 2.9 mm (MNHN-Na 15170).
MUSORSTOM 5, stn DW 301, 22°06.90’S, 159°24.60’E, 487-610 m, 12.X.1986, 1 ♂ cl 3.8 mm, 1 ♀ cl 4.0 mm (MNHN-Na 15171). — Stn DW 305, 22°09.27’S, 159°24.42’E, 430-440 m, 12.X.1986, 1 ovigerous ♀ cl 4.0 mm (MNHN-Na 15172).
MUSORSTOM 6, stn DW 478, 21°08.96’S, 167°54.28’E, 400 m, 22.II.1989, 1 ovigerous ♀ cl 3.7 mm (MNHN- Na 15173).
BATHUS 4, stn DW 929, 18°51.55’S, 163°23.27’E, 502-516 m, 7.VIII.1994, 1 ♂ cl 3.8 mm (MNHN-Na 15174).
Tonga. BORDAU 2, stn CP 1527, Eua, 21°16’S, 174°59’W, 483-509 m, 3.VI.2000, 1 ovigerous ♀ cl 4.5 mm (MNHN-Na 15175).
DISTRIBUTION. — So far known only from New Caledonia and Tonga, 410- 610 m.
SIZE. — Females cl 3.7-5.0 mm, ovigerous females cl 3.7-5.0 mm; males cl 3.8-4.3 mm.
ETYMOLOGY. — From the Latin uni - (one) and spinosa (spined), and indicating the presence of only one median tooth on the carapace.
DESCRIPTION
Rostrum ( Fig. 14A, B View FIG ) slightly ascending, straight, narrow, distal part slightly compressed laterally, falling slightly short of or slightly overreaching distal margin of first segment of antennular peduncle; dorsal surface rounded in anterior part and flattened in posterior part, bearing few short setae in proximal 0.40; lateral tooth weak, arising from 0.40-0.50 of rostrum; lateral face slightly concave at base, without lateral carina; ventral margin devoid of blade, but occasionally with one small tooth or trace of tooth subdistally.
Carapace ( Figs 13 View FIG ; 14A, B View FIG ) 1.10-1.20 times as long as wide. Middorsal carina low, extending to midlength of carapace, terminating anteriorly in small epigastric tooth at anterior 0.10-0.11 of carapace, otherwise unarmed on midline of carapace. Dorsal surface with transverse row of long plumose setae across midlength, interrupted medially. Antennal tooth small, reaching midlength of cornea of eye. Branchiostegal tooth directed forward, falling short of anterior margin of antennal basicerite. Pterygostomial tooth tiny. Lateral surface of carapace with relatively small hepatic tooth, but epibranchial tooth absent; epibranchial carina absent.
Sternal tooth on fifth thoracic somite absent in spawning female ( Fig. 14C View FIG ).
Second abdominal somite ( Fig.13 View FIG ) dorsally round- ed. Third somite ( Figs 13 View FIG ; 14D, E View FIG ) with tergum weakly elevated posteriorly, forming broad, rather inconspicuous middorsal carina; posterodorsal margin of somite produced posteriorly. Sixth somite about two times as long as height; dorsal surface rounded.
Komai T.
Telson ( Fig. 14F View FIG ) with two pairs of small dorsolateral spines; lateral margin with trace of lobe subproximally; three pairs of spines present on posterolateral corner, of them two mesial pairs very slender, subequal in length; terminal process acutely pointed.
Cornea of eye ( Fig. 14A, B View FIG ) very large, somewhat flattened dorsoventrally, maximum diameter 0.30- 0.35 of carapace length.
Antennular peduncle ( Fig. 14A, B View FIG ) reaching 0.45- 0.50 of antennal scale; stylocerite reaching distal margin of first segment, slightly compressed laterally; lateral flagellum composed of about eight to 10 articles in females, 20-25 articles in males; mesial flagellum composed of about 11-15 articles in females, 20-25 articles in males. Antennal scale ( Fig. 14A, H View FIG ) 0.65-0.70 of carapace length and 3.30-3.50 times longer than wide, lateral margin slightly concave, distal blade slightly rounded; basicerite ( Fig. 14A, B View FIG ) with small ventrolateral spine; carpocerite slightly overreaching midlength of antennal scale.
Third maxilliped ( Fig. 16A View FIG ) overreaching antennal scale by distal 0.15-0.20 of ultimate segment; ultimate segment slightly longer than carpus (= penultimate segment); antepenultimate segment moderately slender, not foliaceus.
First pereopod ( Fig. 16B, C View FIG ) with palm about 3.40-3.50 times longer than wide; cutting edge of palm strongly oblique; pollex relatively large, broadly triangular, slightly recurved; carpus armed with two moderately large spines on distolateral margin; merus with strong dorsodistal spine not reaching distal margin of anteriorly extended carpus, distolateral spine long, slender; ventral carina of merus distinct but not lamelliform, terminating distally in sharp tooth. Second pereopod ( Fig. 16D View FIG ) far falling short of midlength of merus of first pereopod; dactylus 0.25-0.30 of propodus length; propodus not widened distally. Third pereopod ( Fig. 16E View FIG ) very slender; ischium 2.50-2.60 of merus length. Fourth pereopod ( Fig. 16F View FIG ) relatively stout, overreaching antennal scale by length of dactylus; dactylus ( Fig. 16G View FIG ) 0.35-0.40 of propodus length, subconical, slightly curved, terminating in acute unguis; propodus with distal tuft of setae ( Fig. 16G View FIG ); carpus 0.60-0.70 of propodus length; merus about 8.0-8.5 longer than wide, unarmed on dorsodistal margin; ischium 0.45-0.50 times of merus length. Fifth pereopod ( Fig. 16H View FIG ) similar to fourth, reaching antennal scale by tip of dactylus; ischium 0.44-0.47 of merus length.
Endopod of first pleopod of male ( Fig. 14J View FIG ) sinuous, spatulate; female endopod ( Fig. 14I View FIG ) slender tapering distally. Appendix masculina on second pleopod distinctly longer than appendix internae ( Fig. 14K View FIG ), bearing moderately long bristles on dorsal surface to terminal to subterminal parts.
Coloration
Unknown.
REMARKS
This new species is unique within the genus in having only one small middorsal tooth (= epigastric tooth) on the carapace. Other characteristics of L. unispinosa n. sp. include: the eye is somewhat depressed dorsoventrally and its size is very large, maximum diameter is 0.30-0.35 of the carapace length; the subchela has a strongly oblique cutting edge and relatively large, recurved pollex; and the dactyli of the fourth and fifth pereopods are subconical, neither dorsoventrally nor laterally compressed. In comparison with L. ecarina n. sp., L. indica and L. tridentata , the fourth and fifth pereopods are relatively stout, but being less stout than in L. armata n. sp.
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.