Notoprotomima smithi, Takeuchi & Lowry, 2015

Takeuchi, Ichiro & Lowry, James K., 2015, A taxonomic study on the Phtisicidae (Crustacea: Amphipoda) of New South Wales, Australia, Journal of Natural History 50, pp. 603-648 : 635-640

Notoprotomima smithi sp. nov.

( Figures 17 – 20 )

Type material

Holotype, male, AM P47831, 33°49 ʹ S, 151°18 ʹ E, east of North Head, Port Jackson , New South Wales, 32 m depth, 23 May 1972, AMSBS . Paratypes, 1 mature female, AM P47827, 33°49 ʹ S, 151°18 ʹ E, east of North Head, Port Jackson, New South Wales, 19.8 m depth, 19 February 1973, AMSBS; 3 males, 5 mature females and 1 juvenile, AM 33°49 ʹ S, 151°18 ʹ E, east of North Head, Port Jackson, New South Wales, 32 m depth, 23 May 1972, AMSBS; 1 male, P 47832, east of Long Reef, New South Wales, 33°44 ʹ S, 151°19 ʹ E, 15.2 m depth, 28 April 1972, AMSBS; 1 mature female, AM P87330, 33°49 ʹ S, 151°18 ʹ E, east of North Head, Port Jackson, New South Wales, 32 m depth, 23 May 1972, AMSBS.

Additional material examined

2 males and 1 mature female, AM P48681, 30°10 ʹ S, 153°11 ʹ E, Rocky Bluff, Coffs Harbour , New South Wales, 23 August 1987, 6 m depth, Ecklonia radiata holdfasts, coll . S .D.A . Smith; 8 males and 2 mature females, AM P48682, 30°10 ʹ S, 153°11 ʹ E, Rocky Bluff, Coffs Harbour , New South Wales, 23 August 1987, 6 m depth, Ecklonia radiata holdfasts, coll . S .D.A . Smith; 2 males and 5 mature females, P 47834, 30°07 ʹ S, 153° 12 ʹ E, Woolgoolga Headland , New South Wales, 5 m depth, Ecklonia radiata holdfast, 5 August 1991, coll . S .D.A . Smith; 5 males, 4 mature females and 1 premature female, AM P48685, 30°06 ʹ S, 153°12 ʹ E, Woolgoolga Headland , New South Wales, 31 March 1995, 6 m depth, Ecklonia radiata holdfast, coll . S .D.A. Smith.

Type locality

East of North Head, Port Jackson and east of Long Reef, New South Wales.

Other localities

New South Wales: Rocky Bluff, Coffs Harbour and Woolgoolga Headland.

Description

Male, body length, 3.82 mm, AM P47831. Head and pereonite 1 combined length 0.68 mm; pereonite 2, 0.62 mm; pereonite 3, 0.52 mm; pereonite 4, 0.54 mm; pereonite 5, 0.71 mm; pereonite 6, 0.56 mm; pereonite 7, 0.2 mm.

Head round dorsally, completely fused with pereonite 1.

Antenna 1 slender, shorter than 1/2 of the body length; peduncular article 2 longest; flagellum 1/2 × peduncular length, with five articles; proximal article, result of fusion of two articles. Antenna 2, 3/5 × antenna 1 length; peduncular articles with several feeble setae; flagellum 1/4 × peduncular length, with two articles.

Upper lip notched, forming shallow quadrilateral projections. Mandible right incisor with six teeth, lacinia mobilis with two teeth, with two trapezoid plates decreasing in size, accessory setal row with seven setae; palp article 3 with two long apical setae and distal marginal fringing setae; left incisor with five teeth, lacinia mobilis with two teeth, with three trapezoid plates decreasing in size, accessory setal row with three setae; palp article 3 with two long apical setae and distal marginal fringing setae. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with five stout apical setal-teeth; palp distal margin with two triangular projections and four robust seta. Maxilla 2 inner plate triangular with three apical robust setae; outer plate elongate with five apical setae. Maxilliped inner plate (basal endite) round, with two stout serriform setae on inner half of distal margin, with two setae on outer end; outer plate (ischial endite) oval, 0.8 × length of inner plate (basal endite), inner margin smooth, with three or four setae on inner margin; palp article 2 setose on inner margin; palp article 3 with five distal setae; palp article 4 weakly falcate.

Pereon. Pereonite 5 longest.

Gnathopod 1 carpus and propodus setose; propodus triangular, with three rows of submarginal setae on distal part near anterior margin; palm begins 1/4 along posterior margin, smooth; dactylus curved. Gnathopod 2 begins 2/5 along posterior margin; gill elongate, about 3 × width, about 1/2 × pereonite length; basis about 2 × length of pereonite 2; propodus elongate, subrectangular, large, length 2.6 × width; palm proximal projection with three robust (one large and two small) setae, palm margin concave, smooth, with two triangular projections distally.

Pereopod 3 very slender; gill similar to gill 2; basis to carpus cylindrical; basis longer than other pereopod articles, 2/5 × pereopod length; propodus with distal palm, delimited by two robust setae. Pereopod 4 very slender; shorter than pereopod 3; gill similar to gill 2; propodus with distal palm, delimited by two robust setae. Pereopod 5 slender; dactylus short, straight, with one seta in the middle. Pereopod 6 basis longest followed by merus; carpus with two setae on posterior margin; propodus with two pairs of robust setae on posterior margin, with two robust setae along palm, with trapezoid comb on distal part of palm; dactylus falcate. Pereopod 7 similar to pereopod 6; merus longer than basis.

Uropod 1, peduncle, elongate, about 4 × width; ramus about 3 – 4 × width, 0.45 × peduncular length. Uropod 2, peduncle, elongate, about 3 × width; ramus about 2 – 3 × width, 0.4 × peduncular length.

Female (sexually dimorphic characters). Based on female body length 2.82 mm, AM P87330. Antenna 1, 0.6 × body length. Length of Head/pereonite 1 combined 0.45 mm, and pereonites 2–7, 0.44 mm, 0.37 mm, 0.51 mm, 0.52 mm, 0.37 mm and 0.16 mm, respectively. Pereonite 2 with anterolateral triangular projection. Gnathopod 2 propodus palm margin convex. Pereopod 3 propodus without distal palm and robust setae.

Etymology

This species is named in honour of Dr S.D.A. Smith, who first found the present species and enthusiastically supported the present study.

Remarks

The present species, N. smithi sp. nov., differs from N. grandimana ( Guerra-García, 2004a) , which was recorded from shallow waters of Western Australia, in the following ways: (1) in N. smithi , antenna 1 is shorter than the body length, while in N. grandimana , antenna 1 is about half of the body length; (2) in N. smithi , gills are about half of the corresponding pereonite length, while in N. grandimana , gills are 1/3 to 1/2 of the body length; (3) in N. smithi , there are two triangular projections situated near distal end of palm of gnathopod 2, while in N. grandimana , the middle projection on the palm is rectangular (based on Guerra-García 2004a: 19, Figure 16 ); (4) in pereopods 6 and 7 of N. smithi , the trapezoid comb is present on the distal part of the palm of the propodus, while in N. grandimana , the propodus of pereopods 6 and 7 lack the comb; (5) in N. smithi , the third article of the mandibular palp has two large setae, while in N. grandimana the third article has three large setae.

Figures

Figure 16. Scanning electron microscopy (SEM) observation on ontogenetic change of gnathopod 2 in Metaproto novaehollandiae (Haswell, 1879a) from Botany Bay, New South Wales. (A) Normal type of propodus of gnathopod 2 of a male, 5.06 mm, AM P84634. (B) and (C) Robust type of propodus of gnathopod 2 of a male, 9.57 mm, AM P84638. Since the SEM photos were taken at the Australian Museum after 36 years from the collection, lateral parts of propodus and dactylus of both individuals might be shrunken.

Figure 17. Notoprotomima smithi gen. nov., sp. nov. from east of North Head, Port Jackson, New South Wales. Male, holotype, 3.82 mm, AM P47831; b, female, paratype, 2.82 mm, AM P87330. Bar indicates 1.0 mm.

Figure 18. Notoprotomima smithi gen. nov., sp. nov. from east of North Head, Port Jackson, New South Wales. Male, holotype, 3.82 mm, AM P47831. Bars in ABD (LT) and ABD (V) indicate 0.05 mm and those in A2, G1, G2, P3, P4, P5, P6 and P7 indicate 0.20 mm.

Figure 19. Notoprotomima smithi gen. nov., sp. nov. from east of North Head, Port Jackson, New South Wales. Male, holotype, 3.82 mm, AM P47831. Bars indicate 0.05 mm.

Figure 20. Notoprotomima smithi gen. nov., sp. nov. from east of North Head, Port Jackson, New South Wales. Female, paratype, 2.82 mm, AM P87330. Bar in ABD (V) indicates 0.05 mm and those in G2, P3 and P4 indicate 0.20 mm.