Haploops robusta G.O. Sars, 1891

Kaim-Malka, R. A., Bellan-Santini, D. & Dauvin, C., 2016, On some Haploops species collected in the North Atlantic Ocean with the description of Haploops islandica n. sp. (Crustacea: Gammaridea: Ampeliscidae) [Contribution to the knowledge of the Haploops genus. 8.], Zootaxa 4179 (1) : -

Haploops robusta G.O. Sars, 1891

Haploops robusta G.O.Sars, 1891 .

Haploops robusta G.O.Sars : in Stebbing, 1906; in Stephensen 1925; in Gurjanova 1951. nec Haploops setosa Boeck : in Dunbar 1954; in Kanneworff 1966; in Mills 1971; in Barnard& Karaman 1991. nec Haploops setosa f. sarsi Schellenberg 1925 : in Barnard & Karaman 1991. nec Haploops sibirica Gurjanova, 1929 ; in Barnard & Karaman, 1991.

Bioice material ( Fig. 1 ).

Station 3208, 1 specimen, 9 July 2001, depth: 2002–2004 m, 65° 43' 93'' N–7° 00' 95'' W.

Station 3539, 1 specimen, 10 September 2002, depth: 1377– 1370 m, 61° 59' 63'' N–13° 33' 09'' W.

Station 3656, 1 specimen, 23 July 2004, depth: 1492– 1490 m, 68° 47' 11'' N–15° 18' 67'' W.

Description. Adult female with oostegites not completely developped. Length: 12.85 mm ( Fig. 11 ). Bioice 3656, 23 July 2004, depth: 1490–1492 m, 68° 47' 11'' N – 15° 18' 67'' W.

Body with long dorsal setae (broken) on the pereon, and pleon (see discussion)( Fig. 11 )

Head: nearly square, with a rostrum but without corneal lenses, blind species. The anterior margin is convex ( Fig. 12 A).

Antenna 1: near as long as antenna 2, ½ body length. Peduncle of A1 with article 3 <article 1 <article 2 (11 / 28 / 60). Flagellum long, with 38 articles ( Fig. 12 B).

Antenna 2: a little longer than antenna 1, ½ body length. Two teeth are present on the peduncle segment 2 ( Fig. 12 C). Peduncle segment 5 is slightly longer than 4 (51 / 47). Flagellum with 38 articles.

Antenna 1 and Antenna 2 are densely setose with very long setae. Their peduncles are long and strong.

Upper lip ( Fig. 12 J): without hair.

Mandible ( Fig. 12 D): molar strong; palp very long, article 2 slightly longer than article 3, each article bears long setae. Article 3 with 4 long apical setae.

Lower lip bilobed.

Maxilla 1 ( Fig. 12 G): the inner plate is conical shaped with two sub apical setae; outer plate with spine teeth distally; palp ended with some setae and strong teeth.

Maxilla 2 ( Fig. 12 H ); the two plates are subequal in length and apically densely setose.

Maxilliped ( Fig. 12 E): inner plate subrectangular, elongate, characterized by the presence of two strong teeth and setae on the distal part ( Fig. 12 F); internal margin of the outer plate with numerous long setae; palp elongate, longer than outer plate, article 2 and 3 with long setae, dactylus elongate and slender.

Pereon. Long setae (broken) are present on the posterodorsal part of the pereon segment 6 and 7 ( Fig. 11 ).

Gnathopod 1 ( Fig. 13 A): coxa 1 shorter than basis, roughly rectangular, distal margin rounded and fringed with long setae; basis very long and slightly curved, basis = merus + carpus + propodus, merus, carpus and propodus bear very long setae; propodus roughly rectangular and cover by numerous short setae; dactylus curved, with short spines, in the specimen studied a very strong subapical tooth was present, the size of this tooth was very different between the right dactylus ( Fig. 13 B) and the left one ( Fig. 13 C), the origin of this dimorphism cannot be given.

Gnathopod 2 ( Fig. 13 D): coxa 2 is roughly rectangular, the distal margin is rounded with some short setae. Basis long with long setae, basis = ischium + merus + carpus; carpus longer than propodus (36/18), roughly rectangular with long setae on the margins; propodus subrectangular, covered by numerous short setae; dactylus curved and ornamented with setae and spines ( Fig. 13 E).

Pereopod 3 ( Fig. 13 F): coxa 3 is roughly rectangular, distal margin rounded with few setae; basis rectangular, basis = ischium + merus; the margins of the different articles of pereopod 3 bear few long setae, except dactylus; dactylus slender, curved and slightly longer than propodus.

Pereopod 4 ( Fig. 13 G): coxa 4 wide, length / width = 25 / 36, the anterior margin of coxa 4 is divided in two part, the 1/3 superior part is straight, the 2/3 inferior part is directed obliquely towards the head, anteroventral corner very slightly rounded, ventral margin convex with long setae, posterior concavity 2/3 length of the coxa 4, posterior hook length = 1/7 width of coxa 4, corner rounded; basis roughly rectangular, a little longer than ischium + merus; dactylus slender and slightly curved, a little longer than the propodus; the margins of the different articles of pereopod 4, except dactylus, bear long setae.

Pereopod 5 ( Fig. 13H ): coxa 5 roughly triangular; basis oval, anterior margin fringed with short setae; carpus rectangular with a posterodistal lobe, anterior margin with long setae, posterior margin and distal margin ornamented with rows of spines; propodus rectangular, as long as carpus, with long strong spines on the anterior margin and a very long spine on the distal part; dactylus strong and curved, dactylus length = ½ length of propodus.

Pereopod 6 ( Fig.14 A): the structure is the same that pereopod 5, long strong spines on the distal part of the carpus and the propodus.

Pereopod 7 ( Fig.14 B): coxa 7 bilobed; basis moderatly broad (length without lobe / width = 32 / 18), anterior and posterior margins straight, numerous long setae on inner side, external side glabrous; lobe not deflected, rounded and setose, reaching the middle of merus; ischium and merus quadrangular with strong spines on the posterior margin; carpus suboval (width / length = 8 / 13), with 5 strong spines on the posterior margin (propodus / carpus = 10 /13; propodus + dactylus / carpus = 17 / 13); propodus narrow: width / length = 3 / 10 (propodus width / carpus width = 3 / 8), with 2 strong spines on the posterior margin and on the distal margin; dactylus very long and narrow (length /width = 32 / 4) with 2 little apical setae (dactylus length / propodus length = 6 /10) ( Fig. 14 C).

Pleon. Long setae (broken) are present on the posterodorsal part of the pleon segment 1 and 2 ( Fig. 11 ).

Epimeral plate 1 ( Fig. 14 D): ventral margin rounded, with a little seta.

Epimeral plate 2 ( Fig. 14 E): ventral margin straight, with a little spine.

Epimeral plate 3 ( Fig. 14 F): anterior margin straight, anteroventral corner rounded with 4 setae, ventral margin very slightly convex, posteroventral corner ended with a little acute tooth, posterior margin convex.

Urosome ( Fig. 14 L): the urosome segment 1 has a small dorsal convex carina; a small dorsolateral process is present on each side of urosome segment 2.

Uropod 1 ( Fig. 14 G) moderatly long, the rami are subequal (inner ramus length /outer ramus length = 5 / 5.5); outer ramus slightly curved. Each ramus bears strong spines; peduncle longer than the rami (rami length / peduncle length = 5–5.5 / 6.5), ornamented with strong spines on each margin and also with a row of four spines in its middle part.

Uropod 2 ( Fig. 14H ): shorter than uropod 1; rami subequal and shorter than peduncle (rami length / peduncle length = 58 / 75); long setae on peduncle, very long spines on peduncle and rami (peduncle partly broken).

Uropod 3 ( Fig. 14 J): rami subequal, more or less triangular, longer than peduncle (rami length / peduncle length = 5.5 / 4); inner ramus with long setae on each margin; outer ramus with short spines and setae on each margin and some long apical setae; peduncle short and strong (length / width = 4 / 2.7)

Telson ( Fig. 14 K): triangular rounded, longer than wide (length / width =110 / 85), cleft on 7/11 of the length, three apical setae of different size are present on each lobe, the longuest is 8/11 the length of the telson.

Male unknown.

Distribution in the examined collection. Deep species: 1370–2004 m. Present on deep sandy-silt substrates, in the same habitats than the decapod Bythocaris spp., the mysid Boreomysis spp. and the fish of the genera Lycodes and Paraliparis .

Figures

FIGURE 1. Distribution of the four Haploops species studied: H. carinata, H. setosa, H. robusta, H. islandica. Position of the Bioice stations where the specimens of Haploops were collected. For the species H. carinata and H. islandica, some stations are very near, and to the scale of the map, they appear fused, so than their number is different from the number indicated in the text.

FIGURE 11. H. robusta G. O. Sars, 1891, female. Note that the dorsal setae are broken, and that they are represented with their observed length; Scale 2 mm.

FIGURE 12. H. robusta G. O. Sars, 1891, female. A: Head; B: Antenna 1; C: Antenna 2; D: Mandible; E: Maxilliped; F: Maxilliped, enlargement of the distal part of the internal lobe with the two teeth; G: Maxilla 1; H: Maxilla 2; J: Upper lip. Scales: F: 0.1 mm; A, B, C, D, E, G, H, J: 0.5 mm.

FIGURE 13. H. robusta G. O. Sars, 1891, female. A: Gnathopod 1; B: Gnathopod 1, dactylus (right); C: Gnathopod 1, dactylus (left); D: Gnathopod 2; E: Gnathopod 2, dactylus; F: Pereopod 3; G: Pereopod 4; H: Pereopod 5. Scales: B, C, E: 0.1 mm; A, D, F, G, H: 1 mm.

FIGURE 14. H. robusta G. O. Sars, 1891, female. A: Pereopod 6; B: Pereopod 7; C: Pereopod 7, dactylus; D: Epimeral plate 1; E: Epimeral plate 2; F: Epimeral plate 3; G: Uropod 1; H: Uropod 2; J: Uropod 3; K: Telson; L: carina. Scales: 0.5 mm.