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.101913ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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 1996ı 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.