Platytyphlops lowryi, Gerken, 2018

Gerken, Sarah, 2018, The Lampropidae (Crustacea: Cumacea) of the World, Zootaxa 4428 (1), pp. 1-192 : 151-158

publication ID	https://doi.org/ 10.11646/zootaxa.4428.1.1
publication LSID	lsid:zoobank.org:pub:2419A7F0-5AED-47EC-86BB-06AADB2A4BD9
DOI	https://doi.org/10.5281/zenodo.3799262
persistent identifier	https://treatment.plazi.org/id/03FD87BA-FF7A-2EB6-64FF-F8F2D34BC90F
treatment provided by	Plazi
scientific name	Platytyphlops lowryi
status	sp. nov.

Treatment

Platytyphlops lowryi View in CoL n. sp.

( Figs 59–62 View FIGURE 59 View FIGURE 60 View FIGURE 61 View FIGURE 62 )

Type material. Holotype: ovigerous female AM P101493 , 33°43’S, 151°54’E, 466 m, north–east of Long Reef , New South Wales, Australia, collected by FRV “Kapala”, 19 December 1985. GoogleMaps

Paratypes: female AM P 101494, female AM P 101495, adult male AM P 101496, collected with holotype GoogleMaps

Other material. 62 individuals, AM P101497, 33°43’S, 151°54’E, 466 m, north-east of Long Reef , New South Wales, Australia, collected by FRV “Kapala”, 19 December 1985; 10 individuals, AM P101498 , 33°43’S, 151°53’E, 518 m GoogleMaps ; 13 individuals, AM P101499 , 33°42’S, 151°54’E, 466 m. GoogleMaps

Diagnosis. Carapace with 3 pairs lateral ridges, marginal carina entire, ridge present on pseudorostrum; eyelobe without lenses or tumidities. Antennule article 1 not expanded; accessory flagellum 1.1 main flagellum. Telson shorter than uropod peduncles, center pair of lateral setae longer than other lateral setae, with 5 terminal setae, terminal setae equal. Uropod endopod article 1 2.0 length of articles 2 and 3 together. Adult male carapace dorsoventrally flattened relative to female, ridge pattern identical. Antennule with cluster of aesthetascs on article 1 of main flagellum, accessory flagellum 0.9 length of main flagellum. Antennal flagellum extending to posterior border of pereonite 2. Telson with 5 terminal setae, central seta longest, outermost pair longer than inner pair.

Description. Paratype subadult female AM P 101494.

Subadult female, 7.5 mm. Carapace with marginal carina, large semi–circular carina posterior–dorsally, with short carina posteriorly, ventral to the dorsal carina, with long carina from anterior margin about 0.75 length of carapace, dorsal to marginal carina; pseudorostral lobes 0.4 carapace length; eyelobe 0.1 carapace length, no lenses; carapace 1.5 length of pereonites together ( Fig. 59 View FIGURE 59 A–B).

Antennule peduncle article 1 1.2 article 2 length, unarmed; article 2 0.8 article 2, with many simple setae; article 3 0.6 article 2 length, with many simple setae; main flagellum of 4 articles, 0.6 peduncle length, with simple setae and 2 aesthetascs terminally; accessory flagellum of 3 articles, 1.1 length of main flagellum, with simple setae ( Fig. 59C View FIGURE 59 ).

Antenna of 3 articles; article 1 with 2 plumose setae; article 2 with 1 spine and 1 simple setae; article 3 as long as article 1 and 2 together, with pedunculate setae terminally ( Fig. 59D View FIGURE 59 ).

Mandible navicular, with row of 13 microserrate setae, lacinia mobilis with 3 cusps ( Fig. 59E View FIGURE 59 ).

Maxillule with 2 endites; outer endite with 9 stout setae; inner endite with 2 simple and 2 dentate setae; palp with 2 setae ( Fig. 59F View FIGURE 59 ).

Maxilla with 3 endites; broad endite distal margin with pappose, simple and microserrate setae, 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 extend past distal margin of broad endite ( Fig. 59G View FIGURE 59 ).

Maxilliped 1 basis produced distally as blunt lobe, distal margin of lobe with simple and stout setae, medial margin of lobe with pappose and hook setae; ischium absent; merus with 1 plumose seta laterally; carpus 1.9 merus length, medial face with simple and comb setae, with 1 plumose seta laterally; propodus 0.8 carpus length, with simple and pappose setae; dactylus 0.5 propodus length, with 4 simple setae terminally ( Fig. 59H View FIGURE 59 ).

Maxilliped 2 basis as long as all other articles together, medial margin lined with simple setae, with plumose and pappose setae distally; ischium unarmed; merus 0.3 basis length, with 1 plumose seta laterally; carpus 1.4 merus length, with plumose setae medially and 1 plumose seta laterally; propodus 0.8 carpus length, with pappose and plumose setae; dactylus 0.5 propodus length, with 3 simple setae terminally ( Fig. 59I View FIGURE 59 ).

Maxilliped 3 basis as long as next 4 articles together, medial and lateral margins with pappose setae, not expanded; ischium 0.6 basis length, unarmed; merus 3.3 ischium length, with 2 pappose setae medially and 3 plumose setae laterally; carpus 2.0 merus length, with plumose and simple setae medially; propodus 0.75 carpus length, with pappose setae medially, simple setae laterally; dactylus 0.5 propodus length, with simple setae terminally; exopod longer than basis, basal article with 1 pappose seta, flagellum with plumo-annulate setae ( Fig. 60A View FIGURE 60 ).

Pereopod 1 broken.

Pereopod 2 basis longer than next 4 articles together, medial and lateral margins with pappose setae; ischium 0.05 basis length, with simple setae; merus 3.33 ischium length, with 2 microserrate setae with single subterminal setule, 1 plumose seta; carpus 3.0 merus length, with 12 microserrate setae with single subterminal setule, 1 plumose seta; propodus 0.2 carpus length, with 1 microserrate seta with single subterminal setule, 1 simple seta; dactylus 4.2 propodus length, with 5 microserrate setae with single subterminal setule, 6 simple setae; exopod shorter than basis, basal article with 4 pappose setae, flagellum with plumo-annulate setae ( Fig. 60B View FIGURE 60 ).

Pereopod 3 basis 2.0 all other articles together, with plumose setae; ischium 0.05 basis length, with 2 simple setae; merus 4.5 ischium length, unarmed; carpus 0.4 merus length, with 1 simple and 2 annulate setae; propodus 0.6 carpus length, with 1 annulate seta; dactylus equal to propodus length, with 2 simple setae terminally; exopod rudimentary, 0.07 basis length, of 2 articles with simple setae ( Fig. 60C View FIGURE 60 ).

Pereopod 4 basis 1.8 all other articles together, with plumose setae; ischium 0.07 basis length, with 2 simple setae; merus 3.0 ischium length, with 1 simple seta; carpus 0.7 merus length, with 1 simple and 2 annulate setae; propodus 0.5 carpus length, with 1 annulate; dactylus equal to propodus length, with 3 simple setae terminally; exopod rudimentary, 0.08 basis length, of 2 articles with simple setae ( Fig. 60D View FIGURE 60 ).

Pereopod 5 basis 1.4 all other articles together, with pappose setae; ischium 0.09 basis length, with 1 simple seta; merus 2.0 ischium length, with 1 simple and 1 pappose setae; carpus 0.8 merus length, with 1 simple and 2 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.7 propodus length, with 1 simple seta terminally ( Fig. 60E View FIGURE 60 ).

Telson 2.0 length of pleonite 6, with 6 or 8 lateral setae, 3–4 proximal short setae, 1 longer seta, then 2–3 distal short setae, 5 terminal setae ( Fig. 60F View FIGURE 60 ).

Uropod peduncles 2.4 pleonite 6 length, 1.1 telson length, with 11–13 setae medially. Uropod endopod of 3 articles, 1.1 peduncle length; article 1 2.0 article 2 and 3 together, with 19 simple with single subterminal setule setae medially; article 2 0.2 article 1 length, with 5 simple with single subterminal setule setae medially, 1 pedunculate and 1 complex pedunculate setae laterally; article 3 1.1 article 2 length, with 4 simple with single subterminal setule setae medially, 2 simple setae laterally, simple terminal seta 0.75 article 3 length. Uropod exopod 0.8 length of endopod; article 1 0.2 article 2 length, unarmed; article 2 with 8–12 simple with single subterminal setule setae laterally, 9–16 simple setae medially, simple terminal seta 0.7 article 2 length ( Fig. 60F View FIGURE 60 ).

Paratype adult male, AM P 101496 .

Adult male, 5.8 mm. Carapace with marginal carina, large semi–circular carina posterior–dorsally, with short carina posteriorly, ventral to the dorsal carina, with long carina from anterior margin about 0.75 length of carapace, dorsal to marginal carina; pseudorostral lobes 0.3 carapace length; eyelobe 0.07 carapace length, no lenses; carapace 1.9 pereonites. Pereonites 3 and 4 produced as large lobe at the ventral midline ( Fig. 61 View FIGURE 61 A–B).

Antennule peduncle article 1 equal to article 2 and 3 together, with2 simple setae, corner serrate; article 2 0.7 article 1 length, with 8 simple setae; article 3 0.6 article 2, unarmed; main flagellum of 5 articles, article 1 expanded with many setae, with simple setae and 2 aesthetascs terminally; accessory flagellum of 3 articles, 0.9 main flagellum length, with simple setae ( Fig. 61C View FIGURE 61 ).

Antenna peduncle of 5 articles; article 1 unarmed; article 2 with 1 plumose seta; article 2 unarmed; article 4 and 5 with ranks of setae on anterior face; flagellum with short articles, extending to pleonite 2 ( Fig. 61 View FIGURE 61 D–E).

Maxilliped 3 basis longer than all other articles together, margins with pappose setae, not expanded; ischium 0.05 basis length, with 1 pappose seta; merus 2.3 ischium length, with 2 pappose setae medially and 2 pappose setae laterally; carpus 3.3 merus length, with simple and plumose setae medially, 2 simple setae laterally; propodus 0.5 carpus length, with plumose and simple setae medially, simple setae laterally; dactylus 0.75 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 1 pappose seta, flagellum with plumoannulate setae ( Fig. 61F View FIGURE 61 ).

Pereopod 1 basis longer than next 3 articles together, margins with plumose setae; ischium 0.9 basis length, with 1 plumose seta; merus 3.0 ischium length, with 5 simple setae; carpus 1.5 merus length, with 4 simple setae; propodus 1.1 carpus length, with 9 simple setae; dactylus 0.7 propodus length, with 9 simple setae, 2 simple setae terminally; exopod shorter than basis, basal article with 7 plumose setae, flagellum with plumo-annulate setae ( Fig. 62A View FIGURE 62 ).

Pereopod 2 basis longer than next 4 articles together, margins with plumose setae, medial margin serrate distally; ischium 0.05 basis length, with 3 simple setae; merus 3.3 ischium length, with 1 simple seta; carpus 2.5 merus length, with 10 setae with single subterminal setule medially; propodus 0.3 carpus length, with 2 simple setae; dactylus 2.75 propodus length, with 8 simple setae, 1 simple seta terminally; exopod shorter than basis, basal article with 5 plumose setae, flagellum with plumo-annulate setae ( Fig. 62B View FIGURE 62 ).

Pereopod 3 basis 1.8 all other articles together, margins with simple and plumose setae; ischium 0.04 basis length, with 2 simple setae; merus 6.0 ischium length, with 2 simple setae; carpus 0.7 merus length, with 1 simple and 2 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.75 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 4 plumose setae, flagellum with plumoannulate setae ( Fig. 62C View FIGURE 62 ).

Pereopod 4 basis 1.9 all other articles together, margins with plumose setae; ischium 0.04 basis length, with 2 simple setae; merus 5.5 ischium length, with 2 simple setae; carpus 0.7 merus length, with 1 simple and 2 annulate setae; propodus 0.5 carpus length, with 1 annulate seta; dactylus 0.5 propodus length, with 3 simple setae terminally; exopod shorter than basis, basal article with 4 plumose setae, flagellum with plumo-annulate setae ( Fig. 62D View FIGURE 62 ).

Pereopod 5 basis equal to all other articles together, with 5 simple setae; ischium 0.1 basis length, with 2 simple setae; merus 2.5 ischium length, with 1 simple seta; carpus 1.4 merus length, with 1 simple and 2 annulate setae; propodus 0.4 carpus length, with 1 annulate seta; dactylus 0.3 propodus length, with 3 simple setae terminally ( Fig. 62E View FIGURE 62 ).

Pleopod 1 biramous, basal article serrate; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 62F View FIGURE 62 ).

Pleopod 2 biramous, basal article serrate, with plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 62G View FIGURE 62 ).

Pleopod 3 biramous, basal article with plumose setae; medial ramus with projection, both rami with long plumo-annulate setae ( Fig. 62H View FIGURE 62 ).

Telson 3.0 length of pleonite 6, with 6 lateral setae, 3–4 short seta proximally, 1 longer seta, then 1–2 shorter distal setae, 5 terminal setae, central seta longest ( Fig. 62I View FIGURE 62 ).

Uropod peduncles 3.5 pleonite 6 length, 1.2 telson length, with 24–25 microserrate setae with single subterminal setule medially. Uropod endopod of 3 articles, equal to peduncle length; article 1 2.0 length of articles 2 and 3 together, with 19–23 microserrate setae with single subterminal setule medially; article 2 0.2 article 1 length, with 4 microserrate setae with single subterminal setule medially; article 3 1.3 article 2 length, with 3 microserrate setae with single subterminal setule medially, 2 setae laterally, terminal microserrate setae with single subterminal setule, 1–1.5 article 3 length. Uropod exopod 0.8 length of endopod; article 1 0.2 length of article 2, unarmed; article 2 with 9 setae medially, 10 setae with single subterminal setule laterally, terminal seta with single subterminal setule, 0.5 article 2 length ( Fig. 62I View FIGURE 62 ).

Etymology. The species is named for Jim Lowry, in honor of all his contributions to crustacean systematics and great hospitality.

Depth. 466–518 m.

Distribution. South-east Australian continental slope.

Remarks. Platytyphlops lowryi is most similar to P. arafurensis , but can be differentiated by having 28 or more setae medially on the uropod peduncle, compared to P. arafurensis with 20 setae medially on the uropod peduncle.