Notoprotella cornuta, Takeuchi & Lowry, 2019

Takeuchi, Ichiro & Lowry, James K., 2019, A taxonomic study on Orthoprotella and related genera (Crustacea: Amphipoda: Caprellidae) of New South Walesı Australia, Journal of Natural History 53 (17), pp. 1023-1059 : 1040-1045

Notoprotella cornuta sp. nov.

( Figures 8 – 10 )

Type material

Holotypeı maleı AM P. 101913 ı South Solitary Islandı Solitary Islandsı New South Walesı 30°12 ʹ 19 ʺ S 153°15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi. Paratypesı 1 maleı 2 mature femalesı AM P.48614ı South Solitary Islandı Solitary Islandsı New South Walesı 30°12 ʹ 19 ʺ S 153°15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi ; 3 malesı 1 mature femaleı AM P.48615ı South Solitary Islandı Solitary Islandsı New South Walesı 30°12 ʹ 19 ʺ S 153°15 ʹ 55 ʺ Eı hydroids on coralı 20 m depthı 5 February 1996 ı coll. I. Takeuchi; 1 maleı 2 mature femalesı AM P.48617ı South Solitary Islandı Solitary Islandsı New South Walesı 30°12 ʹ 19 ʺ S 153°15 ʹ 55 ʺ Eı red algaı coral zone on rocksı 12 m depthı 5 February 1996 ı coll. I. Takeuchi ; 1 males and 1 mature femaleı AM P.48633ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29°55 ʹ 30 ʺ S 153°23 ʹ 14 ʺ Eı hydroids close to lower end of rock wallı 17 m depthı 8 February 1996 ı coll. I. Takeuchi; 3 malesı 1 matureı 3 premature and 1 immature femalesı 1 juvenileı AM P.48634ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29°55 ʹ 30 ʺ S 153°23 ʹ 14 ʺ Eı hydroids close to lower end of rock wallı 17 m depthı 8 February 1996 ı coll. I. Takeuchi ; 3 malesı 2 mature and 1 premature femalesı 7 juvenilesı AM P.48635ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29°55 ʹ 30 ʺ S 153°23 ʹ 14 ʺ Eı hydroids in middle of rock wallı 14 m depthı 8 February 1996 ı coll. I. Takeuchi; 2 malesı 1 juvenileı AM P.48636ı ‘ The Canyons ’ ı off North Solitary Islandı Solitary Islandsı New South Walesı 29°55 ʹ 30 ʺ S 153°23 ʹ 14 ʺ Eı hydroids on top of rocksı 8 m depthı 8 February 1996 ı coll. I. Takeuchi ; 1 maleı AM P.48653ı Korffs Isletı Solitary Islandsı New South Walesı 30°19 ʹ 03 ʺ S 153°09 ʹ 15 ʺ Eı hydroidsı 8 m depthı 6 February 1996 ı coll. I. Takeuchi I.; 5 malesı 5 mature and 1 immature femalesı 1 juvenileı AM P.48664ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29°55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı hydroids near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi and S.D.A. Smith ; 10 malesı 8 matureı 3 prematureı and 2 immature femalesı AM P.48665ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29°55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi; 2 malesı 1 mature femaleı AM P.48666ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29°55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi ; 1 mature femaleı AM P.48667ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29° 55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 coll. I. Takeuchi; 13 malesı 10 mature and 1 premature femalesı AM P.48668ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29°55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı Pterocladia capillacea near top of rock wallı 8 m depthı 8 February 1996 ı coll. I. Takeuchi ; 7 malesı 5 mature femalesı 2 juvenilesı AM P.48670ı ‘ Bubble Cave ’ ı off North Solitary Islandı New South Walesı 29°55 ʹ 40 ʺ S 153°23 ʹ 21 ʺ Eı hydroids in middle of rock wallı 13 m depthı 8 February 1996 ı coll. I. Takeuchi.

Type locality

Solitary Islandsı New South Walesı Australia.

Description

Holotype, male ı body length 7.90 mmı AM P. 101913. Head 0.48 mm; pereonite 1ı 0.38 mm; pereonite 2ı 1.44 mm; pereonite 3ı 1.85 mm; pereonite 4ı 1.61 mm; pereonite 5ı 1.41 mm; pereonite 6ı 0.36 mm; pereonite 7ı 0.36 mm.

Head/pereonite 1 fused (suture present) with small mid-dorsal hump; eyes largeı distinctive. Antenna 1 0.6 × body length; peduncle article 2 longest; flagellum 0.7 × peduncular lengthı with 13 articlesı proximal article composed of 3 articles. Antenna 2 ı 0.5 × antenna 1 length; flagellum 0.12 × peduncular lengthı flagellum with 2 articles.

Upper lip weakly notchedı forming rounded quadrilateral projections. Mandible right incisor with 5 teeth; lacinia mobilis with 5 teethı with 3 bundled setal rows; palp 3-articulate; article 3 setal formula 1 – 9 – 1 – 1; molar well developed; left incisor with 5 teeth; lacinia mobilis with 3 teethı with 3 bundled setal rows; palp article 2 with 5 lateral setae; palp article 2 setal formula 1 – 9 – 1 – 1. Lower lip finely setose on inner and outer lobes. Maxilla 1 outer plate with 7 stout apical setal-teeth; palp distal margin with 4 triangular projectionsı each with a slender or robust setaı with a row of 3 slender setae. Maxilla 2 inner plateı triangular with 8 apical setae; outer plate elongate with 8 apical setae. Maxilliped basal endite (inner plate) ovalı with 1 small nodular setaı with 4 setae near distal margin; ischial endite (outer plate) 2.2 × inner plateı inner margin smoothı with 2 setae on inner marginı with 1 – 2 setae on distal margin; palp article 2 setose on inner margin; palp article 3 without distal projectionı with about 11 moderately dense distal setae; palp article 4 enlargedı blunt.

Pereon. Pereonite 2 with minute anterolateral projectionı with midlateral projectionı with paired mid-dorsal triangular projections. Pereonite 3 longestı with minute anterolateral projection.

Gnathopod 1 carpus and propodus setose; propodus trianguları with 3 – 4 rows of submarginal setae near anterior marginı propodus palm begins less than 0.25 along anterior margin of propodusı propodus with 1 robust seta near corner of palm. Gnathopod 2 begins 0.20 along anterior margin of corresponding pereonite; coxa vestigial; basis subequal in length to pereonite 2ı with anterodistal projection; ischium with anterodistal projection; carpus 0.17 × propodus length; propodus largeı elongated (subrectangular)ı length 2 × widthı anterodistal margin widely concaveı propodus with anterodistal triangular projection; palm proximal projection with 1 robust (grasping) seta; propodus palm irreguları with hook-like projection at base of dactylusı with midpalmar projectionı with deep sinusı with broadı well-developed distal shelfı distal shelf with two triangular projections distally.

Gill 3 gill ovateı length 0.30 × corresponding pereonite. Pereopod 3 very slenderı with 2 articles; length 3 × width; article 1 (or basal article) with 5 distal and 3 lateral setae; article 2 (or distal article) tinyı conical with 1 lateral seta. Gill 4 ovateı length 0.5 × corresponding pereonite. Pereopod 4 with 2 articlesı similar to pereopod 3.

Pereopod 5 slender; basis longer than propodus; carpus with ca. 12 setae on anterior to distal margin; propodus with 1 pair of robust setae from 1/5 on anterior marginı with 8 short setae along palm; dactylus curvedı not setose. Pereopod 6 more robust than pereopod 5. Pereopod 7 more robust than pereopod 6.

Pleon. Pleopods absent. Uropod 1 bi-articulate; peduncle elongateı length about 2.5 × widthı with 6 distal and 2 lateral setae; ramus length about 0.3 × peduncular lengthı about 2 × widthı with 2 setae. Uropod 2 vestigial. Telson (dorsal lobe) present.

Paratype, mature female (sexually dimorphic characters)ı body length 5.39 mmı AM P.48667. Head 0.39 mm; pereonite 1ı 0.21 mm; Pereonite 2ı 1.02 mm; Pereonite 3ı 1.17 mm; Pereonite 4ı 0.87 mm; Pereonite 5ı 1.02 mm; Pereonite 6ı 0.27 mm; Pereonite 7ı 0.44 mm. Pereonite 3 with anterolateral triangular projectionı with anterodorsal lobe. Pereonite 4 with anterolateral lobe. Gnathopod 2 begins 0.15 along anterior margin of corresponding pereonite; propodus anterodistal margin slightly widely concave; propodus palm without hook-like projection at base of dactylusı with deepı narrow sinus. Gill 3 gill ovateı length 0.40 × corresponding pereonite. Gill 4 length 0.7 × corresponding pereonite.

Etymology

The species name ’ is derived from cornu ı based on “ horn ” -like mid-dorsal triangular projections on pereonite 2.

Remarks

Notoprotella cornuta sp. nov. differs from N. berentsae (Takeuchi and Lowryı 2007b) by the following species diagnostic characters: (1) presence of small mid-dorsal hump on head of N. cornuta sp. nov.; (2) while pereonite 2 of N. cornuta sp. nov. has midlateral projection near the base of gnathopod 2ı N. berentsae lacks this projection; (3) while in N. cornuta sp. nov. the mid-dorsal projection of pereonite 2 is distinct and trianguları N. berentsae is smallı and subtriangular; (4) while in uropod 2 of N. cornuta sp. nov. the ramus is about 1/3 of peduncular lengthı N. berentsae is less than 1/4 of peduncular length. Thusı we established the new speciesı Notoprotella cornuta sp. nov.

Figures

Figure 8. Notoprotella cornuta gen. nov., sp. nov. from South Solitary Island and North Solitary Island, Solitary Islands, New South Wales. Holotype, male, 7.90 mm, AM P.101913; paratype, female, 5.39 mm, AM P.48667. Bar indicates 1.0 mm.

Figure 9. Notoprotella cornuta gen. nov., sp. nov. from South Solitary Island, Solitary Islands, New South Wales. Holotype, male, 7.90 mm, AM P.101913. Bars indicate 0.05 mm.

Figure 10. Notoprotella cornuta gen. nov., sp. nov. from South Solitary Island, Solitary Islands, New South Wales. Holotype, male, 7.90 mm, AM P.101913, G1, G2, P3, P4, P5, P6, P7, and AB; paratype, female, 5.39 mm, AM P.48667, AB. Bars indicate 0.2 mm.