Haploops islandica

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 islandica nov. sp.

Type material. HOLOTYPE. One adult female with oostegites not completely developped. Length: 16.24 mm ( Fig. 15 ). Bioice 3625, 15 July 2004, depth: 1630– 1627 m, 66°59' 03'' N–8°48' 06'' W.—Holotype IMNHR-33741 + slides IMNHR-33742. This specimen is deposited in the Icelandic Museum of Natural History in Reykjavik (IMNHR).

Biofar material. Station 343, 5 specimens, 22 July 1988, depth: 710 m, 62°14.6’N – 09°32.6 W, bottom: coarse sand, cobbles and stones.

Bioice material

Station 2937, 1 specimen, 28 August 1996, depth: 285– 283 m, 65° 55' 90'' N–26° 41' 70'' W.(IMNHR-33743)

Station 3198, 1 specimen, 0 8 July 2001, depth: 935 m, 65° 30' 50'' N– 08° 31' 30'' W. (IMNHR-33744)

Station 3199, 1 specimen, 0 8 July 2001, depth: 934–938 m, 65° 30' 08'' N–08° 31' 59'' W, sandy silt. (IMNHR- 33745)

Station 3515, 3 specimens, 0 4 September 2002, depth 1331–1334 m, 62° 22' 20'' N–18° 23' 35'' W. (IMNHR- 33746)

Station 3595, 1 specimen, 10 September 2003, depth 916–917 m, 61° 49' 58'' N–26° 09' 97'' W, sponges spicules. (IMNHR-33747)

Station 3596, 1 specimen, 10 September 2003, depth 895–914 m, 61° 49' 73'' N–26° 10' 63'' W, with sponges, corals and echinoderms. (IMNHR-33748)

Station 3597, 2 specimens, 10 September 2003, depth: 774– 765 m, 62° 17' 43'' N–25° 37' 52'' W, silty sand.(IMNHR-33749)

Station 3599, 1 specimen, 10 September 2003, depth: 765–784 m, 62° 17' 38'' N–25° 37' 68'' W.(IMNHR- 3350)

Station 3625, 1 specimen, 15 July 2004, depth: 1630– 1627 m, 66°59' 03'' N–08°48' 06'' W. (IMNHR-33741; 33742)

Station 3632, 4 specimens, 16 July 2004, depth: 1727– 1726 m, 68°00' 92'' N–09°14' 78'' W, sponges (IMNHR- 33751)

Station 3657, 18 specimens, 23 July 2004, depth: 1499–1501 m, 68°45' 37'' N–15°22' 80'' W.(IMNHR-33752)

Station 3657, 2 specimens, 23 July 2004, depth: 1499–1501 m, 68°45' 37'' N– 15°22' 80'' W ( MSNVR Cr 586)+ slides ( MSNVR Cr 587). These specimens and slides are deposited in the Museo Civico di Storia Naturale di Verona ( Italia) .

Etymology. The name species refers to the Iceland where the species was collected.

Diagnosis. Blind species. Antennae as long as the body length. Peduncles of Antenna 1 and Antenna 2 long and strong. Pereon and Pleon with long setae (broken). Coxa 2 very short, Basis Gnathopod 2 long. Dactylus Pereopod 3 and 4 very long. Pereopod 7 basis moderatly broad, lobe slightly deflected, rounded. Carina straight, moderately hight. Telson with long apical setae.

Description. Holotype. Adult female, 16.24 mm ( Fig. 15 ).

Body with long dorsal setae (broken) on the Pereon segment 5–7 and Pleon segment 1–3.

Head: nearly square, with a rostrum pointed, without corneal lenses, blind species. Anterior margin slightly convex ( Fig. 17 A).

Antenna 1: as long as antenna 2, and as long as the body length. Peduncle of A1 with article 3 <article 1 <article 2 (4/ 11/ 21). Flagellum long, with 46 articles ( Fig. 17 B).

Antenna 2: as long as antenna 1, and as long as the body. Peduncle segment 5 longer than 4 (23 / 19). Flagellum with 37 articles ( Fig. 17 C).

The peduncles of Antenna 1 and Antenna 2 are long and strong. Peduncles and flagellum are densely setose with very long setae ( Figs. 15 & 16 ).

Upper lip: as in the other Haploops species.

Mandible ( Fig. 17 D): molar strong; palp very long, article 2 longer than article 3 (art.2/art.3 = 3/2,4), each article bears long setae, article 3 with 3 long apical setae.

Lower lip bilobed ( Fig. 17 E).

Maxilla 1 ( Fig. 17 F): the inner plate is conical shaped with two apical setae; outer plate with spine teeth distally; palp ended with strong teeth.

Maxilla 2 ( Fig. 17 G): the two plates are densely setosed apically.

Maxilliped ( Fig. 18 A): inner plate subrectangular, elongated, characterized by the presence of two strong teeth and long setae on the distal part ( Fig. 18 B); internal margin of the outer plate with long setae and strong teeth; palp elongate, longer than outer plate, article 2 and 3 with long setae, dactylus elongate, slender and bearing short setae ( Fig. 18 C).

Pereon. Long setae (broken) are present on the posterodorsal part of the pereon segment 5–7; they are frequently broken, particularly on the holotype ( Fig. 15 ).

Gnathopod 1 ( Fig. 18 D): coxa 1 roughly rectangular, distal margin rounded and fringed with long setae; basis long, approximatively rectangular with some setae, length a little less than merus + carpus + propodus, the merus, carpus and propodus bearing long setae; propodus oval; dactylus curved, with short setae ( Fig.18 E), length of dactylus = ½ length of propodus.

Gnathopod 2 ( Fig. 18 F): coxa 2 rectangular and very short (coxa length / basis length = 34/51), distal margin rounded with long setae; basis very long with small setae, basis = carpus + propodus; carpus longer than propodus (carpus length / propodus length = 32/18), roughtly rectangular with long setae on the margins; propodus roughly rectangular, long setae on the margins and also covered by many short setae; dactylus long and curved, dactylus length> ½ propodus length.

Pereopod 3 ( Fig. 18 G): coxa 3 roughly rectangular, distal margin rounded with some setae; basis rectangular, basis = ischium + merus. The margins of the different articles of pereopod 3, except dactylus, bearing few long setae; dactylus slender, curved and longer than propodus (dactylus length / propodus length = 18/ 14).

Pereopod 4 ( Fig. 18H ): coxa 4 anterior margin slightly concave, length / width = 26 / 37, anteroventral corner rounded, ventral margin convex with long setae, posterior concavity 1/2 length of the coxa 4, posterior hook length = 1/5 width of coxa 4, posterior corner very short and straight ( Fig. 18 J); basis length = merus + carpus; The margins of the different articles of pereopod 4, except dactylus, bearing many long setae; dactylus slender, curved and longer than propodus (dactylus length / propodus length = 18/ 16).

Pereopod 5 ( Fig. 19 A): coxa 5 roughly oval, posterior margin rounded; basis pyriform, anterior margin with few short setae; merus anterior margin with short spines; carpus rectangular, anterior margin with strong spines, posterodistal lobe with a long spine; propodus rectangular, shorter than carpus, with strong spines on the anterior margin and short spines on the posterior one; dactylus slender and curved, dactylus length / propodus length =7/16.

Pereopod 6 ( Fig. 19 B): coxa 6 roughly rectangular, posterior margin rounded; basis oval with few short setae on the anterior margin; carpus rectangular, anterior margin and posterodistal lobe with distal strong spines; propodus rectangular and slightly curved, a little shorter than carpus, with strong spines and setae on the anterior margin; dactylus slender and curved, dactylus length / propodus length =7/17.

Pereopod 7 ( Fig. 19 C): coxa 7 roughly rectangular, posterior margin rounded; basis moderatly broad (length without lobe / width = 37 /20), anterior and posterior margin sligthly concave, numerous long setae on inner side, lobe slightly deflected, rounded with few setae, reaching the middle of merus; merus quadrangular with robust spines on the posterodistal margin; carpus subrectangular (width / length = 8/15), with 5 strong spines on the posterior margin (propodus length / carpus length = 11 /15); propodus + dactylus / carpus = 18/15); propodus narrow, width / length = 2/11 (propodus width / carpus width = 2 /8), with 2 spines on the posterior margin; dactylus triangular, long and narrow (length /width = 6/ 1) with 2 very little apical setae (dactylus length / propodus length = 6 / 11).

Pleon. Long setae (broken) are present on the posterodorsal part of the pleon (segment 1–3), they are frequently broken ( Figs. 15 & 16 ).

Epimeral plate 1 ( Fig. 19 D): anterior margin oblique and straight, anteroventral corner rounded, ventral and posterior margin straight.

Epimeral plate 2 ( Fig. 19 E): anterior margin scarcely concave, anteroventral corner rounded with two short setae, ventral margin convex, posteroventral corner rounded, posterior margin convex.

Epimeral plate 3 ( Fig. 19 F); anterior margin straight, anteroventral corner roughly rounded with 3 short setae, ventral margin straight, posteroventral corner ended with a little acute tooth, posterior margin slightly convex.

Urosome ( Figs. 15 , 16 ): the urosome segment 1 has a dorsal carina straight, moderately hight with very small setae; a small dorsolateral process is present on each side of urosome segment 2.

Uropod 1 ( Fig. 19 G): long, rami slender of inequal length, inner ramus slightly shorter than outer ramus (39 / 41); inner ramus with 5 spines; outer ramus with 2 spines; peduncle longer than rami (rami length / peduncle length = 39–41 / 47), with 4 strong spines and 2 long setose setae.

Uropod 2 ( Fig. 19H ): shorter than uropod 1; rami short and subequal, shorter than peduncle (rami length / peduncle length = 30–32/ 35); strong spines on rami, strong spines and setae on peduncle.

Uropod 3 ( Fig. 19 J): peduncle short and strong (length / width = 22 / 15); rami of equal length, foliaceous, longer than peduncle (rami length/ peduncle length = 31 / 22); inner ramus with long apical setose setae and few short spines; outer ramus with long setose setae on the margins and the apical part.

Telson ( Fig. 19 K): triangular rounded, slightly longer than wide (length / width = 35 / 30), cleft on 26/35 of the length, two short setae and one longer are present on the apical part of each lobe.

In summary, the new species Haploops islandica , is morphologically near to the three other species studied in this work, but can be distinguished by its long and strong setose antennae, the very small rectangular coxa 2, very long dactylus of the Pereopods 3 and 4, the coxa 4 anterior margin slightly concave, and a triangular rounded, slightly longer than wide telson with two short setae and one longer present on the apical part of each lobe.

Male unknown.

Distribution. Wide bathymetric range species: 283–1727 m. Present in a wide variety of sediment: sandy silt, silty sand, coarse sand, cobbles and stones, with sediment including pieces of corals, sponges, and echinoderms.

Figures

FIGURE 16. Haploops islandica n. sp., female (Bioice, St. 3657). A female specimen, note the antennae very setose (1); and some of the dorsal setae on the pleon.

FIGURE 15. H. islandica n. sp., holotype female. Note that the dorsal setae are broken, and that they are represented with their observed length; Scale 2 mm.

FIGURE 17. H. islandica n. sp., holotype female. A: Head; B: Antenna 1; C: Antenna 2; D: Mandible; E: Lower lip; F: Maxilla 1; G: Maxilla 2. Scales: 0.5 mm.

FIGURE 18. H. islandica n. sp., holotype female. A: Maxilliped; B: Maxilliped, enlargement of the distal part of the internal lobe with the two teeth; C: Maxilliped, enlargement of the distal part of the palp; D: Gnathopod 1; E: Dactylus of Gnathopod 1; F: Gnathopod 2; G: Pereopod 3; H: Pereopod 4; J: Coxa 4 corner. Scales: 0.5 mm.

FIGURE 19. H. islandica n. sp., holotype female. A: Pereopod 5; B: Pereopod 6; C: Pereopod 7; D: Epimeral plate 1; E: Epimeral plate 2; F: Epimeral plate 3; G: Uropod 1; H: Uropod 2; J: Uropod 3; K: Telson. Scales: 0.5 mm.