Eleven New Species and a New Genus of Diastylidae (Crustacea: Cumacea) from Australia and One New Species from Canada Author Gerken, Sarah text Records of the Australian Museum 2014 2014-02-26 66 1 1 62 http://dx.doi.org/10.3853/j.2201-4349.66.2014.1601 journal article 10.3853/j.2201-4349.66.2014.1601 2201-4349 4684387 Diastylis kapalae n. sp. Figs 10–11 Type material . Holotype subadult female, AM P85772; paratype subadult male, dissected, AM P85773; 33°40'– 33°43'S 152°04'– 152°06'E , 1108–1115 m , FRV “Kapala”, 19 Dec. 1985 . Paratype subadult male, AM P85774, 33 °37'– 33°39'S 152°02'– 152°04'E , 896–923 m , FRV “Kapala”, 10 Dec. 1980 . Other material examined . None. Diagnosis . Female and subadult male . Carapace covered with small spines, two parallel lateral ridges sweeping anteriorly, lined with spines. Pereonites and pleonites with small spines. Telson pre-anal portion lateral margin strongly toothed, lateral setae closely spaced posteriorly, same length as terminal setae. Adult male . Unknown. Description Subadult female . Holotype subadult female, AM P85772, 11.5 mm . —Carapace covered with small spines, with two parallel ridges sweeping from mid dorsal anteriorly, lined with spines, branchial regions slightly inflated, with depression dorsally between inflations; pseudorostral lobes 0.5 × carapace length; eye lobe 0.02 × carapace length, without lenses; carapace 1.9 × length of pereonites together. Pereonites and pleonites with spines ( Fig. 10A ). Subadult male . Paratype subadult male, dissected, AM P85773, 10.5 mm ; paratype subadult male, AM P85774, 10.6 mm . —Carapace ornamentation as in holotype female; pseudorostral lobes 0.5 × carapace length; eye lobe 0.04 carapace length, without lenses; carapace 1.8 × length of pereonites together. Pereonites and pleonites covered with spines ( Figs 10B–C ). —Antennule peduncle article 1 longest, with 1 simple and 1 pappose setae, margin with fine hair-like setae, corner produced as tooth; article 2 0.4 × article 1 length, with 4 plumose setae, produced as small tooth distally; article 3 1.9 × article 2 length, with 1 simple and 1 plumose setae; main flagellum of 5 articles, terminal article 0.7 × length of subterminal article, subterminal article with 2 aesthetascs, terminal article with 2 simple setae; accessory flagellum of 4 articles, 0.5 × main flagellum length, with 4 simple setae ( Fig. 10D ). — Mandible navicular, with 12–13 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 10E ). —Maxillule with 2 endites; outer endite with double row of stout setae; inner endite with 2 simple, 2 microserrate and 1 tricuspid setae; palp with 2 stout setae ( Fig. 10F ). —Maxilla with 3 endites; broad endite distal margin with row of simple setae, pappose seta, medial margin with row of pedunculate setae and 2 pappose setae; medial narrow endite with 3 simple setae terminally; distal narrow endite with 4 simple setae terminally; both narrow endites extending past distal margin of broad endite ( Fig. 10G ). —Maxilliped 1 basis produced as lobe with 7 simple, 2 hook, 1 plumose and 1 very stout microserrate setae; ischium absent; merus unarmed; carpus 1.7 × merus length, with 4 beak and field of simple setae medially, with 2 plumose setae laterally; propodus 0.6 × carpus length, with 2 plumose and 2 dentate setae; dactylus 0.8 × propodus length, with 3 simple setae terminally ( Fig. 10H ). —Maxilliped 2 basis 1.3 × length of all other articles together, with 1 simple and 4 plumose setae distally; ischium 0.04 × basis length, unarmed; merus 4.0 × ischium length, with 2 plumose setae; carpus 2.0 × merus length, with 4 plumose and 3 pappose setae medially, 2 plumose setae laterally; propodus 0.7 × carpus length, with 6 plumose setae medially, plumose seta laterally; dactylus 0.5 × propodus length, with 7 simple setae terminally ( Fig. 10I ). —Maxilliped 3 basis 2.2 × length of all other articles together, with 13 pappose setae medially, 4 plumose setae at distal corner, medial margin produced as strong teeth, increasing in size distally; ischium 0.06 × basis length, with pappose seta; merus 1.2 × ischium length, with pappose seta medially, plumose seta laterally, medial margin and lateral margin each produced as single large tooth; carpus 1.0 × merus length, with 2 pappose setae medially, 2 plumose setae laterally, medial margin produced as 2 large teeth; propodus 1.8 × carpus length, with 4 plumose setae medially, plumose seta laterally; dactylus 0.7 × propodus length, with 5 simple setae terminally; exopod 0.7 × basis length, basal article unarmed, flagellum with plumoannulate setae ( Fig. 11A ). —Pereopod 1 basis 0.5 × length of all other articles together, with 28 plumose setae, medial margin produced as strong teeth, largest at distal corner; ischium 0.1 × basis length, unarmed; merus 1.9 × ischium length, with 3 plumose setae; carpus 2.7 × merus length, with 3 plumose setae; propodus 1.2 × carpus length, with 3 simple setae; dactylus 1.2 × propodus length, with 13 simple setae and simple seta terminally; exopod 0.7 × basis length, basal article with 8 plumose setae, flagellum with plumo-annulate setae ( Fig. 11B ). —Pereopod 2 basis 0.8 × length of all other articles together, with 1 simple and 12 plumose setae, margins produced as few teeth; ischium 0.07 × basis length, with plumose seta, margin produced as large tooth; merus 3.3 × ischium length, with 6 plumose setae; carpus 2.5 × merus length, with 7 simple setae; propodus 0.3 × carpus length, with 3 simple setae; dactylus 1.8 × propodus length, with 3 simple setae and 5 simple setae terminally; exopod 1.0 × basis length, basal article with 6 plumose setae, flagellum with plumo-annulate setae ( Fig. 11C ). —Pereopod 3 basis 1.5 × length of all other articles together, with 9 plumose setae, produced as scattered teeth; ischium 0.08 × basis length, with annulate seta; merus 2.3 × ischium length, with 2 annulate setae, produced as tooth; carpus 1.1 × merus length, with 1 simple, 3 plumose and 6 annulate setae; propodus 0.5 × carpus length, with 1 annulate and 1 pedunculate setae; dactylus 1.6 × propodus length, with 2 simple setae terminally; exopod 0.9 × basis length, basal article with 2 plumose setae, flagellum with short simple setae ( Fig. 11D ). —Pereopod 4 basis 0.9 × length of all other articles together, with 3 simple and 7 plumose setae, margin produced as few teeth; ischium 0.1 × basis length, with simple seta; merus 2.5 × ischium length, with 2 simple setae; carpus 1.3 × merus length, with 2 simple, 2 plumose and 5 annulate setae; propodus 0.5 × carpus length, with annulate and pedunculate setae; dactylus 1.5 × propodus length, with simple seta and simple seta terminally; exopod 1.2 × basis length, basal article unarmed, flagellum with short simple setae ( Fig. 11E ). —Pereopod 5 basis with 1 simple and 3 plumose setae; ischium with 2 simple setae; merus 2.5 × ischium length, with 3 simple setae; carpus 1.4 × merus length, with 2 simple, 3 plumose and 2 annulate setae; propodus 0.4 × carpus length, with annulate seta; dactylus 1.2 × propodus length, with 2 simple setae terminally ( Fig. 11F ). —Telson 2.3 × length of pleonite 6, with 4 pairs of lateral simple setae with single subterminal setule, two terminal setae with single subterminal setule, margin of pre-anal portion strongly toothed ( Fig. 11G ). —Uropod peduncles 2.5–2.7 × pleonite 6 length, 1.1–1.2 × telson length, with 14 or 16 simple setae with single subterminal setule medially. Uropod endopod of 3 articles, 0.6–0.7 × peduncle length; article 1 longest, with 5 simple setae with single subterminal setule medially; article 2 0.4–0.6 × article 1 length, with 2–3 simple setae with single subterminal setule medially; article 3 subequal to article 2, with 2 simple setae with single subterminal setule medially, 0–1 pedunculate and 0–1 simple setae with single subterminal setule laterally, terminal seta simple with single subterminal setule. Uropod exopod 0.9 × length of endopod; article 1 0.3 × article 2 length, with 0–1 simple seta; article 2 with 5 or 8 simple setae with single subterminal setule laterally, 0–1 simple seta with single subterminal setule medially, terminal seta simple with single subterminal setule ( Fig. 11G ). Figure 10. Diastylis kapalae n. sp. female, male. Holotype female, 11.5 mm, AM P85772: (A) , dorsal view. Paratype subadult female, 10.5 mm, AM P85773: (B) , dorsal view; (D) , antennule; (E) , mandibles; (F) , maxillules; (G) , maxilla; (H) , maxilliped 1; (I), maxilliped 2. Paratype subadult male, 10.6 mm, AM P85774: (C) , side view. Scale bars A–C = 5.0 mm, D–I = 0.5 mm. Figure 11. Diastylis kapalae n. sp. female. Paratype subadult female, 10.5 mm, AM P85773: (A) , maxilliped 3; (B) , pereopod 1; (C) , pereopod 2; (D) , pereopod 3; (E) , pereopod 4; (F) , pereopod 5; (G) , pleonite 6, telson and uropods. Scale bar = 1.0 mm. Etymology . The new species is named kapalae for the research vessel that collected the specimens, the FRV Kapala. Remarks . The telson of this species is unique in the Australian diastylid fauna, in being relatively large, with strong teeth on the margins of the pre-anal portion, with 4 pairs of lateral setae closely clustered together and the terminal setae similar in size to the lateral setae on the post-anal portion of the telson. The carapace ornamentation is also unique within the Australian diastylid fauna. This is a large species, as the only specimens observed were more than 10 mm and subadult.