taxonID	type	description	language	source
03B36401A766FFE0B2BDB558FAE5F952.taxon	description	(Fig. 1 A)	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A766FFE0B2BDB558FAE5F952.taxon	materials_examined	Type material. Holotype (by monotypy), one female, BMNH 1889.5.15.70, between Australia and New Guinea (12 ° 8 ' S 145 ° 10 ' E), 1400 fathoms [2560 m], bottom, Globigerina ooze, bottom temperature 36 ° F [2.2 ° C], trawled, 29 August 1874, HMS Challenger station 184. Type Locality. Between Australia and New Guinea (12 ° 8 ' S, 145 ° 10 ' E), depth 1400 fathoms [2560 m]. Material Examined. 1 specimen, AM P. 100454, Central Eastern Commonwealth Marine Reserve, New South Wales (30 ° 05 ' 56 " S 153 ° 35 ' 46 " E), 1257 – 1194 m, 5 June 2017, Four Metre Beam Trawl, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 080). Additional material (not seen). Queensland: 1 specimen, QM W 28407, East of Cairns, Coral Sea (16 ° 50 ' 49.8 " S 147 ° 10 ' 36.6 " E), 1607 m, 14 May 1986, Sledge, ORV Franklin (Station 35 - 3); 1 specimen, QM W 28409, East of Innisfail, Coral Sea (17 ° 18 ' 57.6 " S 147 ° 11 ' 09.6 " E), 1406 m, 12 May 1986, Sledge, ORV Franklin (Station 30 - 2); 1 specimen, QM W 28410, East of Tully, Coral Sea (17 ° 46 ' 31.8 " S 147 ° 48 ' 49.2 " E), 1224 m, 10 May 1986, Sledge, ORV Franklin (Station 20 - 3); 1 specimen, QM W 28408, North East of Townsville, Coral Sea (18 ° 09 ' 07.2 " S 148 ° 31 ' 14.4 " E), 1103 m, 8 May 1986, Sledge, ORV Franklin (Station 11 - 3).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A766FFE0B2BDB558FAE5F952.taxon	discussion	Remarks. The RV Investigator 2017 material expands the known distribution range of the species further south by more than 12 degrees latitude and increases the number of known specimens of Amathillopsis australis to six. Lowry (unpublished) identified four specimens in the Queensland Museum collected in 1986, off Northern Queensland which form a tight geographic Coral Sea sampling cluster compared to the current southern record which, at 30 degrees latitude, is at the boundary region of the Coral and Tasman Seas. Depth. 1103 – 2560 m (Stebbing, 1883; current study).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A766FFE0B2BDB558FAE5F952.taxon	distribution	Distribution. Australia. Torres Strait (Stebbing, 1883), Far North Queensland, Coral Sea (current study).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A765FFE1B2BDB714FEF0FA76.taxon	description	(Fig. 1 B)	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A765FFE1B2BDB714FEF0FA76.taxon	materials_examined	Type material. Neotype, female, 13 mm, 7 slides, AM P. 35581, south-west Greenland, North Atlantic Ocean (61 ° 47 ' N 52 ° 55 ' W), 3000 m, 9 July 1925, coll. S. Jensen, RV Dana (Station 2401). Material examined. 1 specimen, AM P. 100470, Jervis Commonwealth Marine Reserve, New South Wales (35 ° 07 ' 00 " S 151 ° 28 ' 23 " E to 35 ° 05 ' 57 " S 151 ° 27 ' 17 " E), 4026 − 3881 m, 28 May 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 054); 1 specimen, AM P. 100469, off Bermagui, New South Wales (36 ° 21 ' 37 " S 150 ° 38 ' 37 " E to 36 ° 19 ' 24 " S 150 ° 39 ' 01 " E), 2835 − 2739 m, 27 May 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 045); 1 specimen, AM P. 100468, Flinders Commonwealth Marine Reserve, Tasmania (40 ° 27 ' 47 " S 149 ° 24 ' 54 " E to 40 ° 27 ' 40 " S 149 ° 21 ' 59 " E), 4129 − 4131 m, 21 May 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 016); 2 specimens, AM P. 100471, Bass Strait (39 ° 27 ' 43 " S 149 ° 16 ' 37 " E to 39 ° 27 ' 54 " S 149 ° 14 ' 46 " E), 2744 – 2694 m, 22 May 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 023).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A765FFE1B2BDB714FEF0FA76.taxon	discussion	Remarks. The material from the RV Investigator provides additional records for Australian waters and are within the considerable existing range for C. anonyx. Depth. 2400 – 4200 m.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A765FFE1B2BDB714FEF0FA76.taxon	distribution	Distribution. Australia. Great Australian Bight. (Birstein & Vinogradov 1962). Coral Sea: Cape Grenville (Hughes & Lowry, 2015). Tasman Sea: Bass Strait; Flinders Marine Reserve, Off Bermagui; Jervis Commonwealth Marine Reserve (Hughes & Lowry, 2015; current study). For other extralimital geographic records see Hughes & Lowry, 2015: 6.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A764FFE6B2BDB688FB63FB83.taxon	description	(Fig. 1 C)	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A764FFE6B2BDB688FB63FB83.taxon	materials_examined	Type Material. Holotype: adult male, 9.5 mm, (appendages on one slide), CMNC 2002 – 0014, 34 ° 50.2 ' N 123 ° 05.11 ' W, 4050 m, 16 March 1992, Station 1118, Cup # 3. Allotype: adult female, 10 mm, (appendages on one slide), CMNC 2002 – 0015, 34 ° 47.18 ' N 123 ° 04.18 ' W, 4000 m, 27 August 1990, Station 327, Cup # C. Paratypes: female, CMNC 2002 – 0016, same data as allotype; female, ZMUC-CRU- 3723, 34 ° 46.59 ' N 123 ° 04.04 ' W, 4000 m, 22 November 1989, Station 208, Cup # 2; female, USNM 1004364, 34 ° 53.98 ' N 123 ° 11.10 ' W, 3450 m, 23 November 1994, Station 2305, Cup # 5; female, CMNC 2002 - 0017, 34 ° 53.22 ' N 123 ° 02.13 ' W, 4050 m, 4 December 1991, Station 1014, Cup # 5; female, juvenile male, CMNC 2002 – 0018, 34 ° 50.88 ' N 122 ° 58.68 ' W, 4050 m, 26 May 1991, Station 621, Cup # 10; female, CMNC 2002 - 0019, 34 ° 47.94 ' N 123 ° 03.80 ' W, 3450 m, 15 July 1992, Station 1216, Cup # 3; male (broken), CMNC 2002 – 0020, 34 ° 50.97 ' N 122 ° 59.79 ' W, 4000 m, 7 July 1990, Station 439, Cup # 2; female (broken), CMNC 2002 – 0021, 34 ° 49.22 ' N 123 ° 05.50 ' W, 4050 m, 9 February 1994, Station 1822, Cup # 6; juvenile female, (broken), CMNC 2002 – 0022, 34 ° 53.07 ' N 122 ° 59.05 ' W, 3500 m, 16 July 1991, Station 725, Cup # 3; female (broken), CMNC 2002 – 0023, 34 ° 50.97 ' N 122 ° 59.79 ' W, 4050 m, 7 July 1990, Station 439, Cup # 2; male, CMNC 2002 – 0024, 34 ° 55.97 ' N 123 ° 13.89 ' W, 3500 m, 3 October 1996, Station 3034, Cup # 13. Type locality. North-east Pacific off Point Conception, California, 34 ° 50.2 ' N, 123 ° 05.11 ' W, 4050 m. Material examined. 3 specimens (extremely poor condition) AM P. 100459, Flinders Commonwealth Marine Reserve, Tasmania (40 ° 27 ' 47 " S 149 ° 24 ' 54 " E to 40 ° 27 ' 40 " S 149 ° 21 ' 50 " E), 4129 − 4131 m, 21 May 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 016); 1 specimen, AM P. 100460, Central Eastern Commonwealth Marine Reserve, New South Wales, (30 ° 15 ' 48 " S 153 ° 51 ' 31 " E to 30 ° 17 ' 21 " S 153 ° 50 ' 38 " E), 4436 − 4414 m, 6 June 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (IN 2017 _ V 03 _ 089); 1 specimen, AM P. 100461, off Fraser Island, Queensland (25 ° 13 ' 11 " S 154 ° 09 ' 37 " E to 25 ° 15 ' 38 " S 154 ° 12 ' 00 " E), 4005 − 4010, 11 June 2017, Brenke Epibenthic Sledge, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator, (IN 2017 _ V 03 _ 110). Depth. 1787 – 4050 m.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A764FFE6B2BDB688FB63FB83.taxon	discussion	Remarks. The genus Octomana is currently monotypic. The present records from Tasmania to Queensland along eastern Australia are a considerable range extension from the original material of Octomana hadromischa Hendrycks & Conlan, 2003 described from the North-east Pacific off Point Conception, California and off British Columbia. Specimens are in very poor condition, despite being sampled whole in good order the material became disarticulated in 95 % ethanol in the first few years following preservation with no obvious cause.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A763FFEAB2BDB4BCFCC5FE43.taxon	description	(Figs 1 D, 2 – 4)	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A763FFEAB2BDB4BCFCC5FE43.taxon	materials_examined	Type material. Holotype female gravid, 57.5 mm, AM P. 100455, eastern Bass Strait, Australia, (39 ° 33 ' 07 " S 149 ° 33 ' 11 " E to 39 ° 29 ' 46 " S 149 ° 35 ' 53 " E), Four Metre Beam Trawl, 4197 – 4133 m, 23 May 2017, coll. L. E. Hughes, F. Koehler, E. K. Kupriyanova, RV Investigator (INV 2017 _ V 03 _ 030).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A763FFEAB2BDB4BCFCC5FE43.taxon	etymology	Etymology. Named for Wim Decock for his dedicated contribution to taxonomy as a data manager with the World Register of Marine Species.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A763FFEAB2BDB4BCFCC5FE43.taxon	description	Description. Head. Rostrum weakly developed, anterior margin sinuous, lateral cephalic lobe rounded, eyes unknown. Antenna 1 peduncle article 1 twice length of articles 2 and 3 combined; flagellum with 21 segments; accessory flagellum, 1 articulate, minute. Antenna 2 peduncle article 4 subequal to 5, flagellum articles partially fused, 39 articulate. Upper lip as long as broad, asymmetrically lobed, right lobe much larger than left. Mandible well developed, incisors broad, serrate; right lacinia mobilis robust blade, broad, smooth, with acute facial corner; accessory setal row with slender setae; molar present, raised not triturative; palp three-articulate; article 2 longer than 3, lined with slender setae; article 3 with marginal setae. Lower lip broken. Maxilla 1 inner plate large, lined with setae; outer plate broad, with nine setal teeth; palp 2 - articulate, distally broad, length 1.5 times width, lined with 19 short, broad robust setae. Maxilla 2 inner plate length 0.5 times outer plate, margins with long slender simple setae; outer plate with 2 rows of long slender simple setae. Maxilliped inner plate with slender setae; outer plate broad, inner margin straight, lined with short robust setae increasing in length, outer margin with minute setules; palp 4 - articulate, short, length 0.80 times outer plate, with few setae; dactylus straight with unguis. Pereon. Pereonites 1 – 7 smooth, without dorsal projections. Pereopods 2 – 6 gills present. Gnathopods 1 and 2 similar, simple; basis margins without setae. Gnathopod 1 with oostegites, coxa anterior margin straight, not produced, anteroventral margin broadly rounded; carpus rectilinear, broader than propodus, length 1.8 times breadth; propodus with long setae; dactylus broad, straight, 0.6 times length of the propodus, with unguis deflexed. Gnathopod 2 coxa anterior margin convex, ventral margin rounded; carpus rectilinear, broader than propodus, length twice breadth; dactylus length 0.8 times propodus, weakly recurved with unguis deflexed. Pereopod 3 coxa margins parallel, posterior margin convex, length twice width. Pereopod 4 coxa posterior lobe rounded. Pereopods 5 – 6 similar. Pereopod 7 basis proximal margin broadly rounded, posterodistal corner acute; dactylus elongate 0.8 times propodus length, apically rounded. Pleon. Pleonite 1 without dorsal carina. Pleonites 2 – 3 with dorsal carina. Epimeron 1 posterior margin broadly rounded. Epimeron 2 posterior margin proximally rounded, posterodistal margin straight, corner without tooth. Epimeron 3 posterior margin straight, posterodistal corner with small acute tooth. Urosomite 1 with carina and dorsal boss (a deep excavation medially). Urosomites 2 – 3 dorsally smooth, without carina. Uropod 1 longer than uropod 2; biramous, peduncle lines, with medial robust setae, length 1.3 times outer ramus; rami subequal. Uropod 2 inner ramus 0.9 times outer ramus. Uropod 3 peduncle short, slightly longer than broad; rami (regenerating; missing). Telson slightly longer than broad, lobes apically convex, cleft 0.20 times length.	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
03B36401A763FFEAB2BDB4BCFCC5FE43.taxon	discussion	Remarks. Alexandrella wimdecocki sp. nov. is most similar to A. cedrici Souza-Filho et al., 2024, both these species can be distinguished from the 14 described Alexandrella by the pattern of the carinae on the dorsal margins of the pereonites, pleonites and urosomites. Alexandrella wimdecocki sp. nov. differs from A. cedrici in the anterior margin of the head is straight (concave in A. cedrici); the right mandible is a robust smooth blade (serrate in A. cedrici); gnathopod 1 is with oostegites (without in A. cedrici); gnathopods 1 and 2 basis setae absent (present on posterior and anterior margins in A. cedrici). The uropod 1 peduncle is 1.3 time the outer ramus length (subequal in A. cedrici) and the uropod 1 peduncle is lined with robust setae medially (with only one robust seta medially in A. cedrici). At over 57 mm, the present specimen is the largest reported Alexandrella individual. Five other species recorded at 50 mm and over, indicating this may be the maximum size of individuals for the genus (Table 1). The specimen appears senescent based on the fusing of the antenna 2 flagellum articles and the telsonic lobes being uneven with the left lobe cuticle appearing worn and the margins minutely crenulate, presumably where there is a setal fringe which has been abraded away. Ommatidia were not discerned in the material at hand though may be present as eyes are known to disappear in alcohol for this family (d’Udekem d’Acoz & Verheye, 2017: 169).	en	Springthorpe, Roger T., Hughes, Lauren E. (2025): Alexandrella wimdecocki sp. nov. (Stilipedidae Holmes, 1908) and new records for three Australian Abyssal Amphipods (Crustacea: Peracarida). Zootaxa 5636 (3): 538-550, DOI: 10.11646/zootaxa.5636.3.8, URL: https://doi.org/10.11646/zootaxa.5636.3.8
