Quasiparalamprops chathamensis, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 176-181

Quasiparalamprops chathamensis n. sp.

( Figs 70–72 )

Type material. Holotype: ovigerous female, dissected, NIWA 45701 , TAN0705 /99, 44.6°S, 178.5°W, 1076–1103 m, Chatham Rise , New Zealand, April 4, 2007 . Paratype: adult male, dissected, NIWA 45702 , collected with holotype .

Diagnosis. Female. Carapace with 3 pairs of ridges, 1 long pair dorsomedially, 2 short pairs, 1 posterolaterally and 1 mid–laterally; marginal carina serrate; dorsal midline serrate from midpoint to end of eyelobe; pseudorostral lobes with dorsal serrate line, parallel to medial suture, anterior of eyelobe. Male. Carapace with 2 pairs of ridges, 1 long pair dorsomedially, 1 shorter pair laterally, ventral to the long ridge; marginal carina entire, dorsal midline without serrations.

Description. Holotype subadult female, NIWA 45701.

Subadult female, 6.5 mm. Carapace dorsoventrally flattened, with large dorsal ridge on posterior 0.5 of carapace, 1 short posterior ridge and 1 short mid–body ridge between dorsal ridge and marginal carina, marginal carina serrate, anterior dorsal crest with teeth; pseudorostral lobes 0.4 carapace length, with row of spines parallel to suture; eyelobe 0.07 carapace length, no lenses; carapace 1.5 length of pereonites together; pereonites 3–5 with dorsal tubercles; pleonites 1–6 with paired serrate lateral ridges ( Fig. 70A, B ).

Antennule peduncle article 1 longer than articles 2 and 3 together, distal margin serrate, unarmed; article 2 0.6 article 1 length, distal margin serrate, article scaled, 1 plumose seta; article 3 0.7 article 2 length, with 3 simple setae; main flagellum of 4 articles, with simple setae and 2 aesthetascs terminally; accessory flagellum of 4 articles, 0.8 length of main flagellum, with simple setae ( Fig. 70C ).

Antenna of 4 articles; article 1 with 1 pappose seta; article 2 with 1 pappose seta; article 3 unarmed; article 4 1.7 article 3 length, with 3 simple setae and 2 pedunculate setae terminally ( Fig. 70D ).

Pereopod 3 basis 1.4 all other articles together, with 2 simple setae and 1 tooth distally; ischium 0.08 basis length, unarmed; merus 3.0 ischium length, with 1 simple seta; carpus 0.8 merus length, with 1 simple and 1 annulate seta; propodus 0.6 carpus length, with 1 annulate seta; dactylus 0.7 propodus length, with 3 simple setae terminally; exopod rudimentary, 0.1 basis length, of 2 articles with simple setae ( Fig. 70E ).

Pereopod 5 basis equal to next three articles together, with 1 simple seta; ischium 0.2 basis length, unarmed; merus 1.75 ischium length, with 1 simple seta; carpus equal to merus length, unarmed; propodus 0.7 carpus length, with 1 simple and 1 annulate setae; dactylus 0.6 propodus length, with 2 simple setae terminally ( Fig. 70F ).

Telson 3.3 length of pleonite 6, with 3 microserrate lateral setae, 3 microserrate terminal setae, longer than lateral setae ( Fig. 70G ).

Uropods broken.

Paratype adult male, NIWA 45702 . Adult male, broken. Carapace dorsoventrally flattened, with large dorsal carina on posterior 0.5 of carapace, 1 mid lateral carina between dorsal carina and marginal carina, marginal carina entire, in comparison to the female the posterior mid–lateral carina is missing ( Fig. 71A, B ) .

Antennule peduncle article 1 subequal to article 2, unarmed; article 2 margin with 1 tooth, 7 simple setae; article 3 0.6 article 2 length, with 3 simple setae; main flagellum of 5 articles, first article expanded with many slender aesthetascs, with simple setae and 2 aesthetascs terminally; accessory flagellum of 3 articles, equal to main flagellum length, with simple setae ( Fig. 71C ).

Antenna peduncle of 5 articles; article 1 unarmed; article 2 with 2 plumose setae; article 3 shortest, unarmed; articles 4 and 5 with encircling rows of setae; flagellum of short articles, each article encircled with row of setae, extending to posterior border of pleonite 4 ( Fig. 71D ).

Mandible with 10 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 71E ).

Maxillule with 2 endites; outer endite with 11 simple setae; inner endite with 4 simple and 1 dentate setae; palp present, no setae ( Fig. 71F ).

Maxilla with 3 endites; broad endite distal margin with simple setae, 1 pappose seta at medial corner, medial margin with row of simple setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites just past distal margin of broad endite ( Fig. 71G ).

Maxilliped 1 basis produced distally as broad lobe, distal margin of lobe with pappose and dentate setae, medial margin with row of pappose setae; ischium absent; merus with 1 plumose seta laterally; carpus 1.7 merus length, medial face with pappose and comb setae, 1 plumose seta laterally; propodus 0.75 carpus length, with simple and plumose setae; dactylus 0.5 propodus length, with3 simple setae terminally ( Fig. 72A ).

Maxilliped 2 basis as long as all other articles together, with 4 plumose setae distally; ischium 0.1 basis length, with 1 plumose seta; merus 0.75 ischium length, with 2 plumose setae; carpus 4.0 merus length, with 5 plumose setae medially, 1 plumose seta laterally; propodus 0.8 carpus length, with simple and plumose setae; dactylus 0.5 propodus length, with 3 simple setae terminally ( Fig. 72B ).

Maxilliped 3 basis longer than all other articles together, with plumose setae, row of teeth mid–article, not expanded distally; ischium 0.02 basis length, unarmed; merus 5.0 ischium length, with 2 plumose setae medially, 1 plumose seta laterally; carpus 2.6 merus length, with 9 plumose setae; propodus 0.8 carpus length, with 5 plumose setae; dactylus 0.5 propodus length, with 2 simple setae terminally; exopod longer than basis, flagellum with plumo-annulate setae ( Fig. 72C ).

Pereopod 1 basis equal to next 4 articles together, margins serrate, with plumose setae; ischium 0.05 basis length, unarmed; merus 4.0 ischium length, with 2 plumose and 2 simple setae; carpus 2.1 merus length, with 1 plumose and 5 simple setae; propodus 0.8 carpus length, with 3 simple setae; dactylus 0.8 propodus length, with 6 simple setae and 2 simple setae terminally; exopod shorter than basis, basal article with 5 plumose setae, flagellum with plumo-annulate setae ( Fig. 72D ).

Pereopod 2 broken, not illustrated.

Pereopod 3 basis 1.9 all other articles together, with 1 simple and 3 pappose setae; ischium 0.06 basis length, with 1 simple seta; merus 2.3 ischium length, with 1 plumose seta; carpus equal to merus length, with 4 simple and 2 annulate setae; propodus 0.7 carpus length, with 1 annulate seta; dactylus 0.6 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 4 plumose setae, flagellum with plumo-annulate setae ( Fig. 72E ).

Pereopod 4 basis 1.5 all other articles together, with 2 pappose and 6 plumose setae; ischium 0.07 basis length, with 1 annulate seta; merus 2.7 ischium length, with 1 annulate seta; carpus 1.1 merus length, with 3 simple and 2 annulate setae; propodus 0.6 carpus length, with 1 annulate seta; dactylus 0.8 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 2 plumose setae, flagellum with plumo-annulate setae ( Fig. 72F ).

Pereopod 5 basis 1.2 all other articles together, with 1 pappose, 1 simple and 2 plumose setae; ischium 0.1 basis length, with 1 annulate seta; merus 2.3 ischium length, with 1 annulate seta; carpus 1.4 merus length, with 1 simple and 3 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.4 propodus length, with 3 simple setae terminally ( Fig. 72G ).

Pleopod 1 biramous, basal article with 4 plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 72H ).

Pleopod 2 biramous, basal article with 5 plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 72I ).

Pleopod 3 biramous, basal article with 4 plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 72J ).

Telson and uropods missing.

Etymology. The species is named chathamensis for the place of collection, Chatham Rise.

Depth. 1076–1103 m.

Distribution. Chatham Rise, New Zealand, 44.6°S, 176.5°W.

Remarks. Quasiparalamprops chathamensis n. sp. can be distinguished from species of Paralamprops and Platytyphlops by the maxillule palp without setae. Both maxillules in the adult male were observed, and neither setae nor setal bases were present.

Figures

FIGURE 70. Quasiparalamprops chathamensis n. sp. Holotype subadult female NIWA 45701 A, side view; B, dorsal view; C, antennule; D, antenna; E, pereopod 4; G, pereopod 5; H, telson. Scale bars full body 1.0 mm, all others 0.1 mm.

FIGURE 71. Quasiparalamprops chathamensis n. sp. Paratypte adult male NIWA 45702 A, side view; B, dorsal view; C, antennule; D, antenna; E, mandible; F, maxillule; G, maxilla. Scale bars full body 1.0 mm, all others 0.1 mm.

FIGURE 72. Quasiparalamprops chathamensis n. sp. Paratype adult male NIWA 45702 A, maxilliped 1; B, maxilliped 2; C, maxilliped 3; D, pereopod 1; E, pereopod 2; F, pereopod 3; G, pereopod 5; H, pleopod 1; I, pleopod 2; J, pleopod 3. Scale bars 0.1 mm.