Farragolamprops spinacristatus, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 60-64

Farragolamprops spinacristatus n. sp.

( Figs 21–22 )

Type material. Holotype: subadult female, NIWA 45703 , 45.99°W, 178.99°E, 530 m, Chatham Rise, 24 April 2007 . Paratype: ovigerous female, dissected, NIWA 45704 , 40.88°S, 170.85°E, 534 m, Challenger Plateau, 6 June 2007 .

Other material. Subadult female, NIWA 45705, Chatham Rise, 43.29°S, 175.44°W, 644 m, 14 April 2007. Manca 2, NIWA 70519 , 44.48°S, 177.14°E, 1235–1239 m, Chatham Rise, 6 April 2007 .

Diagnosis. Carapace without ridges dorsal of marginal carina, with distinct spines on dorsal crest of frontal lobe; eyelobe without lenses. Telson terminal setae equal in length.

Description. Holotype subadult female, NIWA 45703.

Subadult female, 7.1 mm. Carapace dorsoventrally flattened, with posterior dorsolateral branchial expansion, marginal carina with hyaline fringe, anterior dorsal crest produced as large spines; pseudorostral lobes 0.4 carapace length, pointed and upturned in lateral view; eyelobe 0.06 carapace length, no lenses; carapace 1.4 length of pereonites together ( Fig. 35A, B ).

Paratype ovigerous female, NIWA 45704 .

Ovigerous female, broken.

Antennule peduncle article 1 equal to articles 2 and 3 together, margins serrate, with 5 simple setae; article 2 0.7 article 1 length, margins serrate, with many simple and 1 plumose setae; article 3 0.5 article 2 length, margins serrate, with many simple and 3 plumose setae; main flagellum of 5 articles, 1.25 length of peduncle article 1, with simple setae, with 2 aesthetasc, 2 plumose and 2 simple setae terminally; accessory flagellum of 2 articles, as long as main flagellum, with simple and 1 plumose setae ( Fig. 21C ).

Antenna of 4 articles; article 1 with 2 pappose setae; article 2 with 1 pappose seta; article 3 with spines, no setae; article 4 2.0 article 3 length, with simple and pedunculate setae terminally ( Fig. 21D ).

Mandible navicular (broken), 13 microserrate setae medially, lacinia mobilis with 2 cusps ( Fig. 21E ).

Maxillule with 2 endites; outer endite with 8 microserrate setae; inner endite with 1 dentate, 1 simple and 2 microserrate setae; palp with 1 seta ( Fig. 21F ).

Maxilla with 3 endites; broad endite distal margin with pappose, simple and dentate setae, medial margin with row of simple and pappose setae; medial narrow endite with 4 microserrate setae terminally; distal narrow endite with 5 microserrate setae terminally; both narrow endites extending past distal margin of broad endite ( Fig. 21G ).

Maxilliped 1 basis produced distally as broad lobe, lobe distal margin with simple setae, lateral margin with row of simple setae, medial margin with hook setae; ischium absent; merus with 2 plumose setae laterally; carpus 2.1 merus length, medial face with simple and comb setae, 1 plumose and 2 simple setae laterally; propodus 0.6 carpus length, with pappose and simple setae; dactylus 0.5 propodus length, with 3 simple setae terminally ( Fig. 21H ).

Maxilliped 2 basis as long as all other articles together, medial margin with 4 plumose setae, distal corner with 2 plumose setae, distal margin with fine hair–like setae; ischium 0.02 basis length, unarmed; merus 9.0 ischium length, with 1 pappose and 2 plumose setae; carpus 2.2 merus length, with 7 plumose setae medially; propodus 0.6 carpus length, with simple and plumose setae medially, 3 plumose setae laterally; dactylus 0.7 propodus length, with 3 simple setae medially, simple seta terminally ( Fig. 21I ).

Maxilliped 3 basis longer than next 4 articles together, margins with plumose setae, not expanded; ischium 0.04 basis length, unarmed; merus 4.5 ischium length, with 4 plumose setae medially, 3 plumose setae laterally; carpus 2.2 merus length, with plumose setae medially and 3 plumose setae laterally; propodus 0.75 carpus length, with simple and plumose setae medially, 5 simple setae laterally; dactylus 0.5 propodus length, with 2 simple setae terminally; exopod shorter than basis, basal article with 1 plumose seta, flagellum with plumo-annulate setae ( Fig. 22A ).

Holotype subadult female, NIWA 45703 .

Pereopod 1 basis longer than next 3 articles together; ischium 0.06 basis length, with 1 simple seta; merus 3.3 ischium length, with 3 simple setae; carpus 2.6 merus length, with 7 simple setae; propodus 1.2 carpus length, with 8 simple setae; dactylus 0.7 propodus length, with 9 simple setae and 2 simple setae terminally; exopod shorter than basis, basal article with 4 plumose setae, flagellum with plumo-annulate setae ( Fig. 22B ).

Paratype ovigerous female, NIWA 45704 .

Pereopod 2 basis longer than next 4 articles together, margins with plumose setae, with row of spines proximally; ischium 0.04 basis length, with 1 seta with single subterminal setule; merus 3.5 ischium length, with 1 simple seta and 1 seta with single subterminal setule; carpus 3.6 merus length, with 4 simple setae and 9 setae with single subterminal setule; propodus 0.2 carpus length, with 1 simple seta; dactylus 4.75 propodus length, with7 simple setae and 2 simple setae terminally; exopod shorter than basis, basal article with 5 plumose setae, flagellum with plumo-annulate setae ( Fig. 22C ).

Holotype subadult female, NIWA 45703 .

Pereopod 3 basis 1.5 all other articles together, with 3 plumose setae; ischium 0.07 basis length, with 1 plumose seta; merus 5.0 ischium length, with 1 simple seta; carpus 0.3 merus length, with 1 simple and 2 annulate setae; propodus 0.9 carpus length, with 1 annulate seta; dactylus 0.6 propodus length, with simple seta terminally; exopod rudimentary, 0.1 basis length, of 2 articles with simple and plumose setae ( Fig. 22D ).

Pereopod 4 not examined.

Paratype ovigerous female, NIWA 45704 .

Pereopod 5 basis 1.2 all other articles together, with 6 simple and 2 complex pedunculate setae; ischium 0.1 basis length, with 2 simple setae; merus 1.75 ischium length, with 1 simple seta; carpus equal to merus length, with 2 annulate setae; propodus 0.7 carpus length, with 1 annulate seta; dactylus 0.4 propodus length, with 2 simple setae terminally ( Fig. 22E ).

Holotype subadult female, NIWA 45703 .

Telson 1.5 length of pleonite 6, with2 lateral setae with single subterminal setule, 3 simple terminal setae, longer than lateral setae ( Fig. 22F ).

Uropod peduncles 2.3 pleonite 6 length, 1.6 telson length, with 7 setae with single subterminal setule medially. Uropod endopod of 3 articles, 1.1 peduncle length; article 1 1.6 articles 2 and 3 together, with 10 medial setae with single subterminal setule; article 2 0.4 article 1 length, with 3 setae with single subterminal setule medially, 1 pedunculate and 3 simple setae laterally; article 3 0.9 article 2 length, with 2 setae with single subterminal setule medially, 2–3 simple setae laterally, terminal setae with single subterminal setule, 0.9 article 3 length. Uropod exopod 0.8 length of endopod; article 1 0.2 article 2 length, with 1 simple seta laterally; article 2 with 12 simple setae medially, 14–15 simple setae laterally, terminal seta broken ( Fig. 22F ).

Etymology. The new species is named spinacristatus from the Latin, for the anterior dorsal crest of spines on the carapace.

Depth. 520–644 m.

Distribution. Challenger Plateau, Chatham Rise, New Zealand, 40.88– 43.29°S, 170.85–184.44°E.

Remarks. This species is large and quite distinctive in the lampropid fauna of New Zealand on the basis of the dorsal spine crest. The other species in the genus has a serrate dorsal crest in the female (entire in the adult male), but the serrations are much smaller than the teeth in Farragolamprops spinacristatus . In addition, F. spinacristatus has no ridges dorsal of the marginal carina on the carapace, and the telson terminal setae are equal in length, while in F. seminalis there are ridges dorsal of the marginal carina on the carapace, serrate in the female and juveniles and entire in the adult male, and the telson terminal setae are unequal in length, with the central seta short.

Figures

FIGURE 21. Farragolamprops spinacristatus n. sp. Holotype subadult female NIWA 45703, A, side view; B, dorsal view. Paratype subadult female NIWA 45704, C, antennule; D, antenna; E, mandibles; F, maxillule; G, maxilla; H, maxilliped 1; I, maxilliped 2. Scale bars full body 1.0 mm, all others 0.1 mm.

FIGURE 22. Farragolamprops spinacristatus n. sp. Paratype subadult female NIWA 45704, A, maxilliped 3; C, pereopod 2; E, pereopod 5. Holotype subadult female NIWA 45703, B, pereopod 1; D, pereopod 3; F, telson and uropods. Scale bars 0.1 mm.

FIGURE 35. Misceolamprops concavus n. sp. Paratype adult male AM P101482, A, side view; B, dorsal view; C, antennule; D, antenna; E, maxilliped 3; F, pereopod 1. Scale bars full body 1.0 mm, all others 0.1 mm.