Paradiastylis berentsae, Gerken, 2014

Gerken, Sarah, 2014, Eleven New Species and a New Genus of Diastylidae (Crustacea: Cumacea) from Australia and One New Species from Canada, Records of the Australian Museum 66 (1), pp. 1-62 : 50-53

Paradiastylis berentsae n. sp.

Figs 32–33

Type material. Holotype ovigerous female, AM P53670; paratype ovigerous female, dissected, AM P85809; 33°58'39"S 151°12'22"E, 7.5 m, State Pollution Control Commission, 8 Dec. 1976 . Paratypes 5 individuals, P63682, 33°59'24"S 151°12'48"E, 20 m, State Pollution Control Commission, 7 Feb. 1977 .

Other material examined. 1 individual, P41995; 2 individuals, P41996; 33°58'17"S 151°11'58"E, 7 m, Australian Museum, 7 Apr. 1992 . 1 female, AM P53668, 33°57'12"S 151°10'E, 3 m, State Pollution Control Commission, 3 Dec. 1976 . 2 individuals, AM P53669, 33°58'38"S 151°12'28"E, 7.5 m, State Pollution Control Commission, 13 Dec. 1976 . 2 individuals, AM P53672, 33°58'52"S 151°12'23"E, 7.6 m, State Pollution Control Commission, 13 Dec. 1976 . 1 individual, AM P53673, 33°58'47"S 151°12'16"E, 8 m, State Pollution Control Commission, 13 Dec. 1976 . 1 individual, AM P53674, 33°59'24"S 151°12'48"E, 21 m, State Pollution Control Commission, 24 Jan. 1977 . 5 individuals, AM P53675, 34°00'S 151°14'E, 21 m, 24 Jan. 1977 . 2 individuals, AM P53676; 1 individual, AM P53677; 34°00'S 151°14'E, 11–13 m, 27 Jan. 1977 . 1 individual, AM P53678, 33°59'18"S 151°12'38"E, 19.2 m, State Pollution Control Commission, 2 Feb. 1977 . 2 individuals, AM P53679, 33°59'59"S 151°12'01"E, 4.5 m, State Pollution Control Commission, 2 Feb. 1977 . 1 individual, AM P53680, 33°59'35"S 151°12'56"E, 20 m, State Pollution Control Commission, 4 Feb. 1977 . 2 females, AM P53683, 34°00'S 151°12'E, 13 m, State Pollution Control Commission, 10 Mar. 1977 . 2 ovigerous females, 1 subadult female, AM P53684, 33°59'24"S 151°12'48"E, 13 m, State Pollution Control Commission, 10 Mar. 1977 . 2 ovigerous females, 3 subadult females, 1 juvenile, P42012, 33°58'45"S 151°11'02"E, 7 m, Australian Museum, 28 July 1992 . 1 individual, AM P53687, 33°34'S 151°16'E, 10 m, A. R. Jones and A. Murray, 18 Sept. 1980 . 1 individual, AM P53688, 33°35'S 151°17'E, 4 m, A. R. Jones and A. Murray, 21 Aug. 1984 . 1 individual, AM P85810, 33°58'39"S 151°12'22"E, 7.5 m, State Pollution Control Commission, 8 Dec. 1976 . 1 individual, AM P85811, 27°13'20"S 160°43'25"E, 1989 m, J. K. Lowry, 7 May 1989 . 1 female, AM P85812, 33°34'30"S 151°16'30"E, 4 m, A. R. Jones and A. Murray, 27 May 1983 . 1 female, AM P85813, 33°33'S 150°14'E, 4 m, A. R. Jones, C. J. Watson-Russell, F. Byers, 1 Aug. 1979 . 1 individual, AM P85814, 33°33'S 151°14'E, 4 m, A. R. Jones, C. J. Watson-Russell, F. Byers, 18 Dec. 1979 . 1 individual, AM P85815, 33°33'S 151°14'E, 4 m, A. R. Jones, C. J. Watson-Russell, F. Byers, 21 Aug. 1980 . 1 individual, AM P85816, 33°35'S 151°17'E, 4 m, A. R. Jones and A. Murray, 9 Nov. 1982 . 1 female, AM P85817, 33°35'S 151°17'E, 4 m, A. R. Jones and A. Murray, 21 Aug. 1984 . 1 female, AM P85818, 33°35'S 151°17'E, 4 m, A. R. Jones and C. J. Watson-Russell, 5 Feb. 1977 . 1 female, AM P85819, 33°35'S 151°17'E, 4 m, A. R. Jones and C. J. Watson-Russell, 5 Feb. 1979 . 1 female, AM P85820, 33°35'S 151°17'E, 4 m, A. R. Jones and C. J. Watson-Russell, 13 Nov. 1979 . 1 individual, AM P85821, 33°35'S 151°17'E, 4 m, A. R. Jones and A. Murray, 9 Feb. 1984 . 1 individual, AM P85822, 33°35'S 151°17'E, 12 m, A. R. Jones and A. Murray, 22 Nov. 1976 . 1 female, AM P85823, 33°34'S 151°16'E, 10 m, A. R. Jones and A. Murray, 20 Aug. 1980 . 1 female, AM P85824, 33°34'S 151°13'30"E, 5 m, A. R. Jones and A. Murray, 7 Aug. 1981 . 1 individual, AM P85825, 33°33'30"S 151°14'30"E, 5 m, A. R. Jones and A. Murray, 9 Nov. 1982 .

Diagnosis. Female and subadult male. Carapace with few scattered spines, without ridges. Telson shorter than pleonite 6. Uropod endopod article 1 longer than articles 2 and 3 together. Adult male. Unknown.

Description

Ovigerous female. Holotype ovigerous female, AM P53670, 3.2 mm; paratype ovigerous female, AM P85809. —Carapace with few scattered spines, branchial regions expanded; pseudorostral lobes 0.5 × carapace length, acute; eye lobe 0.08 × carapace length, broader than long, with lenses; carapace 2.5 × length of pereonites together ( Figs 32A–B ). — Paratype ovigerous female, AM P85809. and 3 together, with 1 simple and 1 plumose setae; article 2 0.6 × article 1 length, with 2 plumose and 1 pedunculate setae; article 3 longest, 2.2 × article 2 length, with 1 simple and 1 pedunculate setae; main flagellum of 3 articles, with 2 aesthetascs and 2 simple setae; accessory flagellum of 2 articles, 0.3 × main flagellum length, with 4 simple setae terminally ( Fig. 32C ). —Mandible navicular, with 8 or 11 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 32D ). —Maxillule with 2 endites; outer endite with double row of simple setae, 1 pappose and 1 slender simple setae; inner endite with 2 simple, 2 pappose and 1 tricuspid setae; palp with 2 microserrate setae ( Fig. 32E ). —Maxilla with 3 endites; broad endite distal margin lined with simple setae and 3 pappose setae, medial margin with row of pedunculate 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. 32F ). —Maxilliped 1 basis produced as lobe with 4 simple, 2 hook, 7 pappose and 1 stout simple setae; ischium absent; merus with lateral margin lined with fine hair-like setae; carpus 4.5 × merus length, with 4 beak, 8 pappose and 2 simple setae medially, plumose seta laterally; propodus 0.3 × carpus length, with 2 pappose and 2 plumose setae; dactylus 1.2 × propodus length, with 1 dentate and 1 pappose setae ( Fig. 32G ). —Maxilliped 2 basis 0.7 × length of all other articles together, with 3 plumose and 1 pappose setae distally; ischium 0.1 × basis length, unarmed; merus 1.7 ischium length, with pappose seta; carpus 3.6 × merus length, with 6 pappose setae medially and plumose seta laterally; propodus 0.7 × carpus length, with 5 pappose setae medially and plumose seta; dactylus 0.6 × propodus length, with 4 simple setae ( Fig. 32H ). —Maxilliped 3 basis 1.2 × length of all other articles together, with 7 pappose setae medially, broadened and expanded at distolateral corner to mid-merus, with 5 plumose setae; ischium 0.07 × basis length, with pappose seta; merus 2.0 × ischium length, with 1 plumose and 2 pappose setae medially, plumose seta laterally; carpus 1.8 × merus length, with 1 plumose and 4 pappose setae medially, plumose seta laterally; propodus 1.1 × carpus length, with 3 plumose setae medially, plumose seta laterally; dactylus 0.4 × propodus length, with 3 simple setae and 2 simple setae terminally ( Fig. 33A ). —Pereopod 1 basis 0.6 × length of all other articles together, with 14 plumose setae; ischium 0.05 × basis length, unarmed; merus 2.7 × ischium length, with plumose seta; carpus 3.8 × merus length, with 3 simple setae; propodus 1.3 × carpus length, with 11 simple setae; dactylus 0.4 × propodus length, with 13 simple setae and simple seta terminally; exopod 0.8 × basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 33B ). —Pereopod 2 basis 0.9 × length of all other articles together, with 6 plumose setae; ischium 0.06 × basis length, unarmed; 3.0 × ischium length, with 3 plumose setae; carpus 2.3 × merus length, with 5 simple setae; propodus 0.4 × carpus length, with simple seta; dactylus 1.8 × propodus length, with 3 simple setae and 2 simple setae terminally; exopod 1.3 × basis length, basal article unarmed, flagellum with plumo-annulate setae ( Fig. 33C ). —Pereopod 3 basis 1.0 × length of all other articles together, with 12 simple setae; ischium 0.1 × basis length, with simple seta; merus 3.0 × ischium length, with 5 simple setae; carpus 0.7 × merus length, with 2 simple and 4 annulate setae; propodus 0.6 × carpus length, with annulate seta; dactylus 0.4 × propodus length, with simple seta and simple seta terminally ( Fig. 33D ). —Pereopod 4 basis 1.1 × length of all other articles together, with 10 simple setae; ischium 0.03 × basis length, with simple seta; merus 12.0 × ischium length, with 4 simple setae; carpus 0.8 × merus length, with 1 simple and 5 annulate setae; propodus 0.6 × carpus length, with annulate seta; dactylus 0.6 × propodus length, with simple seta and simple seta terminally ( Fig. 33E ). —Pereopod 5 basis 0.8 × length of all other articles together, with 6 simple setae; ischium 0.08 × basis length, with annulate seta; merus 3.7 × ischium length, with 1 simple and 2 annulate setae; carpus 0.8 × merus length, with 2 simple and 6 annulate setae; propodus 0.7 × carpus length, with annulate seta; dactylus 0.3 × propodus length, with simple seta and simple seta terminally ( Fig. 33F ). —Telson 0.7 × length of pleonite 6, without stout lateral setae, 2 small simple terminal setae ( Figs 33G–H ). —Uropod peduncles 2.8 × pleonite 6 length, 3.9 × telson length, with 1 or several simple setae, 13 or 15 simple setae with single subterminal setule medially. Uropod endopod of 3 articles, 0.5 × peduncle length; article 1 1.4 × length of articles 2 and 3 together, with 3 simple setae with single subterminal setule medially; article 2 0.4 × article 1 length, with 2 simple setae with single subterminal setule medially; article 3 0.8 × article 2 length, with 1 simple seta with single subterminal setule medially, simple seta laterally, terminal seta simple. Uropod exopod of 2 articles, 0.8 × length of endopod; article 1 0.4 × article 2 length; article 2 with 7–8 simple setae, terminal seta simple, about as long as article 1 ( Fig. 33G ).

Etymology. The species is named berentsae for Penny Berents of the Australian Museum.

Remarks. The most similar species to Paradiastylis berentsae are P. botanybayensis n. sp. and P. whitleyi . Paradiastylis botanybayensis can be distinguished by the carapace covered in small spines and the telson longer than pleonite 6, while in P. berentsae the carapace has a few scattered spines and the telson is distinctly shorter than pleonite 6. Paradiastylis whitleyi is similar in the uropod endopod proportions, with article 1 being longer than articles 2 and 3 together; however, the telson has a distinct post-anal portion with stout lateral setae, and the species is only known from Western Australia. In comparison, P. berentsae has no post-anal portion or stout lateral setae on the telson, and is only known from New South Wales.

Figures

Figure 32. Paradiastylis berentsae n. sp. female. Holotype ovigerous female, 3.2

Figure 33. Paradiastylis berentsae n. sp. female. Paratype ovigerous female,AM P85809:(A), maxilliped 3; (B), pereopod 1; (C), pereopod 2; (D), pereopod 3; (E), pereopod 4; (F), pereopod 5; (G), pleonite 6, telson and uropods; (H), telson.Scale barsA–G = 0.5 mm, H = 0.1 mm.