Haploops faroensis, Kaim-Malka & Bellan-Santini & Dauvin, 2021

Kaim-Malka, R. A., Bellan-Santini, D. & Dauvin, J. C., 2021, Complement to the knowledge of the Haploops species (Crustacea, Gammaridea Ampeliscidae), with the description of two new species from North Atlantic Ocean [Contribution to the knowledge of the Haploops genus. 10.], Zootaxa 5048 (2), pp. 151-175 : 152-157

publication ID	https://doi.org/ 10.11646/zootaxa.5048.2.1
publication LSID	lsid:zoobank.org:pub:33AC5E89-A67C-4108-9D29-538BF84D85C2
DOI	https://doi.org/10.5281/zenodo.5555316
persistent identifier	https://treatment.plazi.org/id/03918794-2C60-FF91-B6B8-395BFC4906C0
treatment provided by	Plazi
scientific name	Haploops faroensis
status	sp. nov.

Treatment

Haploops faroensis View in CoL spec. nov.

( Figures 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 )

Type material. HOLOTYPE. One adult female with oostegites not completely developed. Length: 9.18 mm ( Fig.1 View FIGURE 1 ). BIOFAR: Station 299, one specimen, 17 July 1988, depth: 923 m, 60° 10.80’N – 08° 17.30’ W; bottom: clay and silt, sand, gravel. Holotype + slides ( NHMD – 873179). The specimen is deposited in the Natural History Museum of Denmark (Danish Statens Naturhistoriske Museum) .

BIOFAR material. The specimens are deposited in the Natural History Museum of Denmark. Station 269, five specimens, 15 May 1988, depth: 510 m, 62° 49.84’N – 08° 15.55’ W; bottom: mud, sand, cobbles and stones (NHMD-873180). GoogleMaps Station 271, four specimens, 16 May 1988, depth: 559 m, 62° 52.30’N – 08° 09.24’W; bottom: soft bottom, foraminifers (NHMD-873181). GoogleMaps Station 299, one specimen, 17 July 1988, depth: 923 m, 60° 10.80’N – 08° 17.30’W; bottom: clay and silt, sand, gravel (NHMD-873179) GoogleMaps .

BIOICE material. The specimens are deposited in the Icelandic Museum of Natural History in Reykjavik ( IMNHR). Station 2673, nine specimens, 15 July 1994, depth: 227– 222 m, 66° 50.20’N – 16°15.74’W; bottom: sponge spicules. ( IINH 42254 ). GoogleMaps Station 3522, five specimens, 7 September 2002, depth: 1940 m, 62°31.14’N – 17° 09.87’W, bottom: sediment type unknown ( IINH 42253 ). GoogleMaps Station 3544, one specimen, 11 September 2002, depth: 1635– 1632 m, 61°33.00’N – 13°40.14’W, bottom: gravely sand. ( IINH 42252 ) GoogleMaps .

Male unknown.

Etymology. The species name refers to the area of the Faroe Islands where the species was collected.

Diagnosis. Blind species. Pereon, Pleon and Urosome without long dorsal setae. Antenna 1 and Antenna 2 have the same length. Antennae half length of the body. Pereopod 7 basis narrow.

Description. Holotype. Adult female, 9.18 mm ( Fig.1 View FIGURE 1 ). Body without long dorsal setae on the pereon, pleon and urosome.

Head ( Fig. 2A View FIGURE 2 ): rectangular, with a short rostrum pointed, without corneal lenses, blind species. Anterior margin oblique and straight. Antenna 1 ( Fig. 2B View FIGURE 2 ): as long as antenna 2, half length of the body, peduncle of A1 with article 3 <article 1 <article 2 (7/19/22). Peduncle of A1 reaching the half length of article 5 of peduncle of A2; flagellum long, with 18 articles. Antenna 2 ( Fig. 2C View FIGURE 2 ): as long as antenna 1. Peduncle segment 5 longer than 4 (24/20). Flagellum with 17 articles. The two antennae bearing long setae.

Upper lip, and Lower lip bilobate. Mandible ( Fig. 2D View FIGURE 2 ): molar strong; palp long, article 3 longer than article 2 (3/2 = 40/35), setae are present on the margin of each article, article 3 with 3 long apical setae. Maxilla 1 ( Fig. 2G View FIGURE 2 ): the inner plate is conical shaped with one long apical seta; outer plate with spine teeth distally; palp ended with strong teeth and spines. Maxilla 2 ( Fig. 2H View FIGURE 2 ): dense apically setae on the two plates. Maxilliped ( Fig. 2E View FIGURE 2 ): inner plate sub-rectangular, elongated; internal margin of the outer plate with long setae and strong teeth; palp elongate, longer than outer plate, articles 2 and 3 with long setae, article 3 oval shape, dactylus elongate and slender ( Fig. 2F View FIGURE 2 ).

Pereon: without long dorsal setae ( Fig. 1 View FIGURE 1 ). Gnathopod 1 ( Fig. 3A View FIGURE 3 ): coxa 1 roughly triangular, distal margin rounded and fringed with long setae; basis as long as ischium + merus + carpus, more broad on the distal part than proximal one, with some setae on the two margins, the merus, carpus and propodus bearing long setae; propodus oval; dactylus strongly curved, ( Fig. 3B View FIGURE 3 ), dactylus length = 0.6 propodus length. Gnathopod 2 ( Fig. 3C View FIGURE 3 ): coxa 2 approximately rectangular and short (coxa length / basis length = 30/33), distal margin straight with few short setae; basis long, rectangular, with some long setae, basis = ischium + merus + carpus; carpus longer than propodus (carpus length / propodus length = 26/15), approximately rectangular with long setae on the margins; propodus oval, long setae on the margins; dactylus slightly curved with short setae ( Fig. 3D View FIGURE 3 ), dactylus length = 1/3 propodus length. Pereopod 3 ( Fig. 3E View FIGURE 3 ): coxa 3 rectangular, distal margin rounded; basis rectangular, basis longer than ischium + merus + carpus. The margins of the different articles of pereopod 3, except ischium and dactylus, bearing few long setae; dactylus slender, curved and as long as propodus (dactylus length / propodus length = 1). Pereopod 4 ( Fig. 3F View FIGURE 3 ): coxa 4 square-shaped, anterior margin straight, length / width = 40/34, antero-ventral corner rounded, ventral margin slightly curved with short setae, posterior concavity 1/2 length of the posterior length of the coxa 4, posterior hook broad, length = 12/34 width of coxa 4, posterior corner rounded; basis longer than ischium + 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 = 21/17). Pereopod 5 ( Fig. 3G View FIGURE 3 ): coxa 5 roughly rectangular, bi-lobated; basis oval with few short setae on the anterior margin; carpus rectangular, anterior margin with two short setae, posterior margin with two rows of little spines, postero-distal lobe ornamented with short spines and a long seta; propodus rectangular a little longer than carpus, with few short setae on the anterior margin, and long distal setae; dactylus slender and curved, dactylus length / propodus length = 12/40 (0.3). Pereopod 6 ( Fig. 4A View FIGURE 4 ): coxa 6 roughly rectangular, posterior margin rounded; basis rounded with few short setae on the anterior margin; carpus rectangular, anterior margin with few short spines, posterior margin with two rows of little spines, postero-distal lobe ornamented with short spines and a long one; propodus rectangular a little shorter than carpus, with few short setae, and a long distal seta; dactylus slender and curved, dactylus length / propodus length = 8/21. Pereopod 7 ( Fig. 4B View FIGURE 4 ): coxa 7 roughly rectangular, posterior margin rounded; basis narrow (length without lobe / width = 40/20), anterior margin slightly concave, numerous long setae on posterior margin, lobe slightly deflected, rounded with few long setae, reaching the merus; ischium quadrangular; merus rectangular with spines on the margins and long setae on the posterior one; carpus rectangular (width / length = 8/12), with small spines on the anterior and posterior margins and one spine on the posterodistal corners (propodus length / carpus length = 4/12; propodus + dactylus / carpus = 8/12); propodus narrow, width / length = 2/4 (propodus width / carpus width = 2/8), with a short apical seta; dactylus rectangular, short and narrow (length / width = 3/1) with two very small apical setae (dactylus length / propodus length = 3/4).

Pleon ( Fig. 1 View FIGURE 1 ): the postero-dorsal segments of the pleon without setae. Epimeral plate 1 ( Fig. 4G View FIGURE 4 ): anterior margin oblique and straight, ventral margin and posterior one straight, inferior corners rounded. Epimeral plate 2 ( Fig. 4G View FIGURE 4 ): rounded. Epimeral plate 3 ( Fig. 4G View FIGURE 4 ): anterior margin straight, antero-ventral corner rounded, ventral margin straight, postero-ventral corner acute, posterior margin oblique and straight.

Urosome ( Fig. 4H View FIGURE 4 ): the urosome segment 1 has a dorsal carina straight, moderately hight, with the apex rounded. Uropod 1 ( Fig. 4C View FIGURE 4 ): long, rami slender, curved, and equal length; inner ramus with two little spines; peduncle longer than the rami, with 1 spine on the distal margin. length rami / length peduncle = 38 / 52. Uropod 2 ( Fig. 4D View FIGURE 4 ): shorter than uropod 1; rami triangular, inner ramus longer than the outer one, with a row of five little spines on inner ramus and only two spines on outer, outer ramus length / peduncle length = 36 /41; peduncle rectangular, robust with spines on the inner margin. Uropod 3 ( Fig. 4E View FIGURE 4 ): peduncle short and strong (length / width = 25/15); rami of equal length, roughly rectangular, longer than peduncle (rami length / peduncle length = 35/25); inner ramus with three spines and some apical setae, outer ramus with an apical tuft of long setae and also some long setae on the outer margin.

Telson ( Fig. 4F View FIGURE 4 ): rectangular, apically rounded, cleft on 33/45 of the length; one spine and one seta are present on the apical part of each lobe.

Distribution: North Atlantic Ocean; wide bathymetric range species: 222–1940 m, present mainly in soft sediments: mud, sand, gravely sand, clay and silt, gravel, cobbles and stones, foraminifers, sponge spicules.

Taxonomic remarks. H. faroensis spec. nov. belongs to the sub-group of blind species with a narrow pereopod 7 basis and without dorsal tuft seta e. This sub-group includes six other species: H. abyssorum , H. similis , H. vallifera , H. lodo , H. dauvini and H. bjarnii . It differs from these species in having:

— Antennae of the same length and as long as half body length; Antenna 2 = 2/3 body length for H. similis ; the antennae are longer than the body length for H. bjarnii ; for H. lodo , A1= ped A2, A2 shorter than body (in Barnard 1961) (they are half body length for H. vallifera , H. dauvini and H. faroensis ),

— Coxa 4 square-shaped, heart-shaped for H. bjarnii , H. vallifera , H. similis , but also square- shaped for H. abyssorum , H. lodo and H. dauvini .

— Epimeral plate 3 with posterior margin oblique and straight (also for H. similis ); slightly convex for H. bjarnii , H. dauvini , rounded for H. vallifera , H. lodo (not indicated by Chevreux 1908 for H. abyssorum ).

— Uropod 1: rami of same size (also for H. abyssorum ), they are of unequal length (2/3 for H. similis ), the rami are subequal for H. bjarnii , H. vallifera , H. lodo and H. dauvini .