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FIGURE 25. Pleojassa lowryi n in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 25. Pleojassa lowryi n. sp. Holotype, male, 5.3 mm, allotype, female, 4.6 mm and paratypes, male 1, 2.9 mm and male 2, 4.3 mm. Rima Islet, The Snares, New Zealand, 21 November 1976, G. D. Fenwick, coll., AM P.34948, station no. SA-3417. Setae are omitted from the second gnathopod profiles. All views lateral. Scale 0.1 mm.
FIGURE 24. Pleojassa moorei n in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 24. Pleojassa moorei n. sp. Male 4, 3.6 mm, Billie Rocks, Signy Island, South Orkney Islands, 3 March 1965, M. H. Thurston, coll., CMN IZ1989-013, 1969:771:ca 260 (pt.), station no. 16(333). Mouthparts. Frontal view: upper lip; lateral view: maxilla 1; other views medial. Scale 0.1 mm.
FIGURE 16 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 16. Ventojassa frequens (Chilton, 1883). Comparison of thumb length relative to body length for the conical and cubic thumbed males from Chilton's collection at Lyttelton, N.Z. and two collections at Tapeka and Kaikoura, N.Z. about 100 years later. Linear regression assumptions passed for the conical thumbed males at Tapeka. Linear regression statistics: male, thumb length = -0.094 + 0.068 x body length, r2 = 0.754, n = 31.
FIGURE 10 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 10. Ventojassa frequens (Chilton, 1883). Male, 3.6 mm, male 1, 3.3 mm, and adult female, 4.0 mm, Nightingale Island, Tristan da Cunha, 8 February 1938, E. Sivertsen, coll., ZMUO F3934a, station no. 114. Lateral views: whole body and antenna 1; dorsal view: telson; other views medial. Scale 0.1 mm.
FIGURE 13 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 13. Ventojassa frequens (Chilton, 1883). Male 1, 4.0 mm. St. Kilda Rocks, Kaikoura, New Zealand (42.45°S, 173.7°E), 8 November 1973, G. D. Fenwick, coll., AM P.25948. On the green alga Caulerpa brownii (C. Agardh) Endlicher at 3 m depth. Lateral view: full antenna 1 and left antenna flagellum; other views medial. Scale 0.1 mm.
FIGURE 4 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 4. Plumulojassa ocia (Bate, 1862). Female 1, 3.75 mm. Intertidal, in Corallina elongata, Peniche, Portugal, 8 October 1979, J. C. Marques, coll., CMN A2019.0055. Female 2, 3.5 mm and female 3, 4.0 mm, Le Croisic, France, date unknown, E. Chevreux, coll., MNHN Am. 2664. Setae are omitted from the gnathopod 2 profiles of females 2 and 3. Lateral views: all gnathopods 2 and pereopod 5; medial view: uropod 3. Scale 0.1 mm.
FIGURE 20 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 20. Hemijassa goniamera (Walker, 1903). Variation in setation of antenna 2 and shape of the gnathopod 2 palm in three males. A, D: male, 22 mm, Weddell Sea off Kapp Norvegia, Polarstern EASIZ II Expedition (Ant. XV/3), Stn. 049, IG28520, 30 January 1998, Agassiz trawl beginning at 246 m depth, 70.0145°S, 10.00806°W, C. De Broyer and Y. Scailteur, coll. (RBINS). B, E: male, 21 mm, Weddell Sea off Kapp Norvegia, Polarstern EASIZ II Expedition (Ant. XV/3), Stn. 062, IG28252, 31 January 1998, Agassiz trawl beginning at 248 m depth, 70.01461°S, 10.00794°W, C. De Broyer and Y. Scailteur, coll. (RBINS). C, F: male, 22 mm, Stn. 062. IG28252. All views lateral. Scale 1 mm.
FIGURE 2 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 2. Distribution records of Pleojassa moorei, P. lowryi, P. wandeli, P. multidentata, and P. orientalis. Red dot: identification confirmed by specimen examination; green triangle: literature record (Supplementary Table S1) with identification not confirmed but judged likely to be this species.
FIGURE 9 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 9. Ventojassa frequens (Chilton, 1883). Type, adult female, 4.0 mm, CMNZ 2015.149.85, Lyttelton Harbour, New Zealand, date unknown, Charles Chilton, coll. Drawings taken from the mount of the whole animal. Only portions of appendages that were clearly visible could be drawn. Scale 0.1 mm.
FIGURE 32 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 32. Pleojassa wandeli (Chevreux, 1906). Variation in gnathopod 2 thumb length and propodus length relative to body length in males and females from a single population (Billie Rocks, Signy Island, South Orkney Islands, 5 March 1965, M. H. Thurston, coll., NHM 1969:735:39, station no. 10(95)). The male 1 and male 3 illustrated in FIGURE 30 and the female illustrated in FIGURE 33 are indicated by an arrow. Linear regression assumptions passed for the adult female. Linear regression statistics: Adult female, thumb length = -0.455 + 0.229 x body length, r2 = 0.932, n = 11.
FIGURE 17 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 17. Hemijassa goniamera (Walker, 1903). Lectotype, male, 18.3 mm, and paralectotype, male 1, 6.1 mm, Cape Adare, McMurdo Sound, Ross Sea, Antarctica, 10, 14 and 26 November 1899, Southern Cross Expedition, NHM 1987:515. Lateral view: whole body; dorsal view: telson; other views medial. Scale 0.1 mm.
FIGURE 8 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 8. Ventojassa frequens (Chilton, 1883). Type, adult male, 4.0 mm, CMNZ 2015.149.86, Lyttelton Harbour, New Zealand, date unknown, Charles Chilton, coll. Drawings taken from the mount of the whole animal. Only portions of appendages that were clearly visible could be drawn. Setae obscured on the posterior of antenna 1 peduncle article 2 and gnathopod 1 carpus. Scale 0.1 mm.
FIGURE 28. Pleojassa orientalis n in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 28. Pleojassa orientalis n. sp. Holotype, adult female, 9.8 mm and male, paratype, ~6.5 mm (full length estimated from comparison with the female as body posterior to segment 4 missing). Southeast corner of Gorilla Head Rock, Macquarie Island, Australia (54°29ʹS, 158°58ʹE), 23 December 1977, J. K. Lowry, coll., AM P.34955, station no. MA-147. Setae are omitted from the male gnathopod 2 profile. All views lateral. Scale 0.1 mm.
FIGURE 12 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 12. Ventojassa frequens (Chilton, 1883). Male, 4.5 mm. St. Kilda Rocks, Kaikoura, New Zealand (42.45°S, 173.7°E), 8 November 1973, G. D. Fenwick, coll., AM P.25948. On the green alga Caulerpa brownii (C. Agardh) Endlicher at 3 m depth. Lateral views: whole body, gnathopods 1 and 2, pereopod 5 and uropod 3; dorsal view: telson; other views medial. Scale 0.1 mm.
FIGURE 3 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 3. Plumulojassa ocia (Bate, 1862). Neotype, male 1, 3.5 mm. West side of St. Warna's Cove, St. Agnes, Scilly Isles, Cornwall, England, 1 August 1973, P. Parslow, coll., NHM 1987:514. Male 2, 3.0 mm and male 3, 3.7 mm, Le Croisic, France, date unknown, E. Chevreux, coll., MNHN Am. 2664. Setae are omitted from the gnathopod 2 profiles of males 2 and 3. All views lateral. Scale 0.1 mm.
FIGURE 7 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 7. Plumulojassa ocia (Bate, 1862). Female 1, 3.75 mm. Intertidal, in Corallina elongata, Peniche, Portugal, 8 October 1979, J. C. Marques, coll., CMN A2019.0055. Mouthparts. Frontal view: upper lip; lateral view: maxilla 1 and left mandible; other views medial. Scale 0.1 mm.
FIGURE 5 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 5. Plumulojassa ocia (Bate, 1862). Variation in gnathopod 2 palmar tooth length and propodus length relative to body length in males and females from a single population (Le Croisic, France, date unknown, E. Chevreux, coll., MNHN Am. 2664). Second gnathopod profiles illustrated in Figs 3 and 4 are indicated by an arrow. Linear regression assumptions passed for the male. Linear regression statistics: male, palmar tooth length = -0.101 + 0.056 x body length, r2 = 0.756, n = 17; male propodus length = -0.371 + 0.314 x body length, r2 = 0.800, n = 17.
FIGURE 11 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 11. Ventojassa frequens (Chilton, 1883). Male 1, 3.3 mm, Nightingale Island, Tristan da Cunha, 8 February 1938, E. Sivertsen, coll., ZMUO F3934a, station no. 114. Mouthparts. Frontal view: upper lip; lateral views: maxillae 1 and 2, left mandible; other views medial. Scale 0.1 mm.
FIGURE 27 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 27. Pleojassa multidentata (Schellenberg, 1931). Male, 8.0 mm and male 1, 7.4 mm. South Georgia, Swedish Antarctic Expedition (1901–1903), collection date and collector unknown, MfN 22.962. Male 2, paralectotype, 3.7 mm and adult female, lectotype, 7.7 mm. South Georgia, 1883, Deutsche Polar Commission, K. von den Steinen, coll., ZMH K-8028. Setae are omitted from the gnathopod 2 profiles of the male 1 and male 2. All views lateral. Scale 0.1 mm.
FIGURE 31 in New genera for species of Jassa Leach (Crustacea: Amphipoda) and their relationship to a revised Ischyrocerini
FIGURE 31. Pleojassa wandeli (Chevreux, 1906). Variation in antenna 2 article 5 length relative to body length in males from a single population (Billie Rocks, Signy Island, South Orkney Islands, 5 March 1965, M. H. Thurston, coll., NHM 1969:735:39, station no. 10(95)). The male 1 illustrated in FIGURE 30 is indicated by an arrow. Linear regression assumptions failed for this plot.
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