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

publication ID

http://doi.org/ 10.3853/j.2201-4349.66.2014.1601

persistent identifier

http://treatment.plazi.org/id/03FB87F1-2457-253E-FF15-FC9FFB3BFDDE

treatment provided by

Carolina

scientific name

Paradiastylis berentsae
status

n. sp.

Paradiastylis berentsae   n. sp.

Figs 32–33 View Figure 32 View Figure 33

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

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

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 View Materials , 3.2 mm; paratype ovigerous female, AM P85809 View Materials . —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 View Figure 32 ). — Paratype ovigerous female, AM P85809 View Materials . 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 View Figure 32 ). —Mandible navicular, with 8 or 11 microserrate setae medially, lacinia mobilis with 3 cusps ( Fig. 32D View Figure 32 ). —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 View Figure 32 ). —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 View Figure 32 ). —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 View Figure 32 ). —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 View Figure 32 ). —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 View Figure 33 ). —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 View Figure 33 ). —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 View Figure 33 ). —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 View Figure 33 ). —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 View Figure 33 ). —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 View Figure 33 ). —Telson 0.7 × length of pleonite 6, without stout lateral setae, 2 small simple terminal setae ( Figs 33G–H View Figure 33 ). —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 View Figure 33 ).

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.

AM

Australian Museum

R

Departamento de Geologia, Universidad de Chile