Haptocallisoma lemarete, Horton, Tammy & Thurston, Michael H., 2015

Horton, Tammy & Thurston, Michael H., 2015, A revision of the genus Paracallisoma Chevreux, 1903 (Crustacea: Amphipoda: Scopelocheiridae: Paracallisominae) with a redescription of the type species of the genus Paracallisoma and the description of two new genera and two new species from the Atlantic Ocean, Zootaxa 3995 (1), pp. 91-132 : 115-121

Haptocallisoma lemarete sp. nov.

Figs 15–18

sp. nov. aff. Paracallisoma Thurston 1979: 56 .

aff. Paracallisoma Lampitt, Merrett &Thurston 1983: 76 , table 1. Scopelocheirus group gen. nov. Thurston 1990: 262–263, tables 3 & 4. Paracallisoma sp. nov. 1 Duffy, Horton & Billett 2012: 4865. Paracallisoma sp. 4 Horton, Thurston & Duffy 2013: 354–356.

Type material. Holotype— Adult female, 10.6 mm (dissected carcass and seven slides NHMUK. 2848), Station 9131#18, 21 November 1976, 20°07.7’N 21°32.9’W to 20°09.1’N 21°40.4’W, RMT8, 3760– 3920 m (100–250 metres above bottom (mab)).

Paratypes— Station 9131#18, 21 November 1976, 20°07.7’N 21°32.9’W to 20°09.1’N 21°40.4’W, RMT8, 3760– 3920 m (100–250 mab), four specimens ( NHMUK 2015. 2849 -2852).

Additional material— Cape Verde Basin. Station 9131#12, 20 November 1976, 20°07.0’N 21°26.0’W to 20°06.6’N 21°25.1’W, BN 1.5/5C, 3856–3861 m, one specimen. Station 9131#19, 21–22 November 1976, 20°14.4’N 21°47.0’W to 20°23.8’N 21°49.4’W, RMT8, 3500–3760 m (250–500 mab), two specimens. Station 9541#18, 18 April 1977, 20°18.5’N 21°41.2’W to 20°20.8’N 21°53.0’W, RMT8, 3970– 4020 m (0–20 mab), two specimens. Station 9541#19, 18–19 April 1977, 20°19.7’N 21°51.3’W to 20°18.4’N 21°40.5’W, RMT8, 3970– 4040 m (0–20 mab), one specimen. Station 9541#22, 20 April 1977, 20°08.9’N 21°25.0’W to 20°12.5’N 21°37.7’W, RMT8, 3740–387 0m (20–100 mab), one specimen. Station 9541#24, 21 April 1977, 20°20.1’N 21°45.0’W to 20°25.4’N 21°56.3’W, RMT8, 3520– 3940 m (100–500 mab), three specimens. Station 12600#44, 9– 10 October 1993, 21°05.2’N 31°06.6’W, DEMAR, 4540 m, two specimens. Station 12600#60, 14 October 1993, 21°05.1’N 31°12.9’W, DEMAR, 4569 m, two specimens.

Horseshoe Abyssal Plain. Station 9629#1, 27–28 October 1977, 35°47.4’N 13°12.5’W, Trap B, 4855 m, two specimens.

Porcupine Seabight and Abyssal Plain. Station 9756#8, 49°53.6’N 13°57.9’W, Trap B, 13–15 April 1978, 3852 m, one specimen. Station 50909, 10–11 November 1980, 49°53.83’N 14°00.36’W, TAmph, 3918 m, one specimen. Station 52806, 2–3 August 1992, 50°11.8’N 14°41.1’W, Fish Trap, 3976 m, one specimen. Station 53201#25, 14– 15 April 1994, 48°49.1’N 16°31.0’W, DEMAR, 4844 m, six specimens. Station 13077#4, 14–18 March 1997, 48°55.82’N 16°35.25’W, NIOZ Lander trap, 4844 m, 68 specimens. Station 13077#35, 19–23 March 1997, 48°50.10’N 16°24.93’W, NIOZ Lander trap, 4845 m, 60 specimens. Station 13077#71, 24–27 March 1997, 48°50.01’N 16°17.97’W, NIOZ Lander trap, 4840 m, 51 specimens. Station 13077#92, 27–28 March 1997, 48°49.50’N 16°20.97’W, DEMAR, 4844 m, 110 specimens. Station 13078#3, 29–31 March 1997, 48°46.99’N 16°22.09’W, DEMAR, 4842 m, two specimens. Station 13078#14, 1–2 April 1997, 48°55.12’N 16°25.06’W, DEMAR, 4845 m, 59 specimens. Station 13078#22, 3 April 1997, 48°43.02’N 16°38.18’W, DEMAR, 4842 m, 82 specimens. Station 13200#31, 11 July 1997, 48°48.79’N 16°23.43’W, DEMAR, 4842 m, 130 specimens. Station 13200#42, 13–15 July 1997, 48°54.81’N 16°34.93’W, DEMAR, 4844 m, 195 specimens. Station 13200#55, 16 July 1997, 48°49.02’N 16°21.59’W, DEMAR, 4844 m, 129 specimens.

Demerara Abyssal Plain. N.O. Jean Charcot, Cruise DEMERABY, haul Na04, 24 September 1980, 10°21.1’N 46°44.0’W, Trap, 4850 m, one specimen.

Madeira Abyssal Plain. Station 12174#20, 18–23 August 1990, 31°07.6’N 21°10.0’W, BATHYSNACK, 4941 m, three specimens.

Iberian Margin. Station 15734#1, 1–2 August 2005, 39°29.78’N 09°47.89’W, Trap, 3600 m, four specimens. Station 15741#1, 4–5 August 2005, 39°34.95’N 10°16.50’W, Trap, 4286 m, 42 specimens. Station 56837#1, 2–3 May 2006, 38°21.67’N 09°53.00’W, Trap, 4230 m, ten specimens. Station 56839#1, 4–5 May 2006, 38°06.59’N 09°58.18’W, Trap, 4445 m, twelve specimens. Station 56847#1, 7–8 May 2006, 39°35.50’N 10°19.00’W, Trap, 4403 m, 75 specimens. Station JC010/094, 11–13 June 2007, 39°29.90’N 09°56.20’W, Trap, 3400 m, one specimen.

Mid-Atlantic Ridge. Station JC011/098, 9–10 October 2007, 54°04.08’N 34°09.43’W, DEMAR, 2500 m, four specimens.

Description. Holotype, adult female, 10.6 mm.

Head exposed, deeper than long, lateral cephalic lobe short, rounded; rostrum absent. Antenna 1 short, length 0.14 x body; peduncle article 1 short, length 0.83 x breadth; peduncle article 2 short, 0.3 x article 1; peduncle article 3 short, 0.1 x article 1; flagellum seven-articulate, callynophore two-field; accessory flagellum long, 0.7 x primary flagellum, three-articulate, article 1 long, 3.7 x article 2. Antenna 2 length 2.9 x antenna 1; peduncle article 1 greatly enlarged, not covering article 2; article 3 short, 0.6 x article 4; peduncle articles 4 and 5 not enlarged; flagellum well-developed, 26-articulate, long slender setae on some articles. No brush setae, calceoli absent.

Mouthpart bundle subquadrate; interantennal carina sinuous, not notched proximally. Epistome and upper lip separate; epistome produced, rounded; upper lip rounded. Lower lip broadly gaping rounded outer lobes, apically setose. Mandible incisors symmetrical, large, with convex margins; left lacinia mobilis a stemmed asymmetric blade; accessory setal row with three simple robust setae; molar an acute conical structure, mandibular palp attached midway; article 1 short, length 0.75 x breadth, without setae; article 2 slender, length 4.7 x breadth, with eleven submarginal posterodistal A2-setae; article 3 slender, blade-like, with 13 D3 setae along distal two thirds of the margin, and three E3 setae. Maxilla 1 inner plate tapering, inner margin fully setose, with ten pappose setae; outer plate with eleven setal teeth in a simple 7/4 arrangement, outer row with ST1-7 large, slender, ST1-2 without cusps, ST3 four-cuspidate, ST4 five-cuspidate, ST5 four-cuspidate, ST6 three-cuspidate, ST7 three-cuspidate, inner row with STA-D slender, STA without cusps, STB-D one-cuspidate; palp large, strongly broadened distally, two-articulate, article 1 short, article 2 with six terminal robust setae, a robust flag seta and one subterminal seta; Maxilla 2 inner plate broad, tapering distally, with 15 pappose setae in oblique mediofacial setal row, with terminal robust pectinate setae; outer plate longer than inner with apicomedial dentate and plumose setae. Maxilliped inner plate large, subrectangular, with three apical nodular setae and one medial seta, two apical pappose setae near the lateral corner, oblique facial setal row strong with ten pappose setae reaching apical margin; outer plate medium size, oval with seven apical plumose setae, twelve small nodular setae medially and two longer robust setae on the distomedial corner; palp large, four-articulate, article 2, length 2.7 x breadth, 1.9 x article 3; article 3 long, slender, length 1.4 x breadth; dactylus well-developed, with three sub-terminal setae.

Gnathopod 1 simple; coxa large, broad, as long as coxa 2, subquadrate, anterior margin straight; basis long, slender, length 3.2 x breadth, anterior margin smooth; ischium long, length twice breadth, anterior margin smooth with one seta posterodistally; merus, posterior margin with two simple setae distally; carpus subrectangular, long, length 2.5 x breadth; propodus just longer than carpus, tapering, posterior and anterior margins with a few groups of simple, slender setae, apex with numerous distally pappose robust setae; dactylus minute, posterior margin with three small teeth. Gnathopod 2 minutely subchelate; coxa large, subequal in size to coxa 3; ischium, length three x breadth; carpus long, length 2.6 x breadth, posterior margin straight; propodus subrectangular, long, length 1.7 x breadth, posterior margin with groups of slender robust setae, apically with row of slender setae decreasing in size towards palm; palm transverse, convex, serrate; dactylus inserted at centre of propodus apex, curved and not reaching palm corner, corner lacking robust setae. Pereopod 3 prehensile; coxa large, subrectangular; basis robust, sinuous and slightly expanded distally, with five simple setae on posterior margin and one anterodistally; merus slightly expanded anteriorly; carpus shorter than propodus; propodus posterior margin with seven robust setae and two distal locking setae; dactylus long, 0.5 x propodus, curved to close along palm of propodus. Pereopod 4 as in pereopod 3 except coxa width 1.18 x depth, posterior lobe, weakly produced, narrowly rounded, posterior margin sloping anteriorly, propodus posterior margin with six robust setae, and two distal locking setae. Pereopod 5 prehensile; coxa posterior lobate; basis widely expanded, subquadrate, posterior margin straight, posterodistal lobe truncate, extending to distal margin of ischium; merus expanded posteriorly with robust setae on both posterior and anterior margins; carpus shorter than propodus; propodus long, length 4.4 x breadth, anterior margin with one single and five pairs of robust setae and one pair of locking setae; dactylus long 0.6 x propodus, slender, curved to close along palm of propodus. Pereopod 6 prehensile; coxa small, posterior lobate; basis anterior margin, convex and rounded with one long and two short robust setae, proximal posterior margin expanded, rounded, convex with three short simple setae along margin, slightly excavate distally with a round posterodistal lobe, not extending to merus; merus expanded posteriorly with robust setae on anterior and posterior margins, longer than merus of pereopod 5; carpus long, 0.9 x propodus; propodus long, length 5.5 x breadth, anterior margin with six pairs of robust setae and one pair of distal locking setae, posterior margin with five long slender simple setae; dactylus long, slender, curved to close along palm of propodus. Pereopod 7 weakly prehensile; coxa small, posterior lobate; basis anterior margin convex with one slender seta proximally and one short robust seta distally, posterior margin broadly expanded, rounded, convex with eight short simple setae along margin, excavate distally with a short, rounded, posterodistal lobe not extending to merus; merus expanded posteriorly; carpus shorter than propodus; propodus long, length five x breadth, anterior margin with six groups of robust setae, and a pair of distal locking setae; dactylus long, slender, curved to close along propodus.

Gills on pereopods 2–7. Brood plates on pereopods 2–5.

Pleonites 1–3 dorsally smooth. Epimeron 1 convex, rounded posteriorly; anterior margin slightly concave, posterodistal angle obtuse. Epimeron 2 anterior margin sinuous, rounded; posterior margin convex, posteroventral corner slightly produced. Epimeron 3 anterior margin sinuous, rounded, posteroventral corner produced, subacute, ventral margin with seven small robust setae.

Urosomite 1 with a lateral ridge and a slight posterodorsal carina. Uropod 1 peduncle long, with one apicolateral robust seta, one apicomedial robust seta and nine dorsomedial setae; inner ramus length 0.8 x peduncle, with three medial robust setae, one lateral robust seta and microsetose lateral and distomedial margins; outer ramus length 0.75 x inner ramus, with three lateral robust setae and microsetose lateral and medial margins. Uropod 2 peduncle long, with one apicomedial robust seta, three dorsomedial setae, and two dorsolateral robust setae; inner ramus as long as peduncle, with four medial robust setae and five lateral robust setae; outer ramus short, 0.54 x inner ramus, with three lateral robust setae and a microsetose medial margin. Uropod 3 peduncle short, length 1.4 x breadth, with one apicolateral seta, one apicomedial robust seta and two simple setae; inner ramus length 1.9 x peduncle, with two medial robust setae and eight medial slender plumose setae; outer ramus, length at least 1.5 x peduncle, two-articulate; article 1 with five medial robust setae, with a microsetose medial margin and four lateral robust setae, article 2 tip lost.

Telson longer than broad, slightly tapering distally, length 1.7 x breadth, cleft 68%, with 4/5 robust setae on each lobe, distal margins incised with subapical notch and one small immersed seta.

Sexual dimorphism. Male, 10.7 mm, from Station 13200#42. Antenna 2 elongate, as long as pereon, 44- articulate, with brush setae, stronger callynophore, with more profuse aesthetascs; calceoli present on both antennae. Head lobes marginally acute in male, apex just sharper than in female. About 21 plumose setae on uropod 3 medial margin.

Etymology. Derived from the Greek, Lema , -tos (n) — temper of mind, will, courage, audacity; and the Greek, arete (f)— excellence, goodness, virtue; with reference to the motto on the coat of arms granted to the name ‘Bamber’ depicting two red chevrons between four black fleurs-de-lis on a silver shield, the crest being a red bulls head. The motto, “ Fortis et egregious ” translates as “Bold and excellent”, terms which can certainly be used to describe our long-standing friend and colleague Roger Bamber.

Remarks. This species can be distinguished from others in the genus by the quadrate expansion of the basis of pereopod five which is truncate distally.

Depth range. 2500–4850 m. Most records are at abyssal or lower slope depths.

Distribution. North Atlantic Ocean between the Demerara Abyssal Plain and the Mid-Atlantic Ridge at 54°N.

Figures

FIGURE 15. Haptocallisoma lemarete sp. nov. Holotype, adult female, 10.6 mm, habitus.

FIGURE 16. Haptocallisoma lemarete sp. nov. Holotype, adult female, 10.6 mm, head, antennae, gnathopods, epimeres, urosome, uropods.

FIGURE 17. Haptocallisoma lemarete sp. nov. Holotype, adult female, 10.6 mm, mouthparts.

FIGURE 18. Haptocallisoma lemarete sp. nov. Holotype, adult female, 10.6 mm, pereopods, telson.