Haploops similis Stephensen 1925
- Dataset
- 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.]
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Amphipoda
- family
- Ampeliscidae
- genus
- Haploops
- species
- Haploops similis
description
Description. Head: Square shaped, without corneal lenses, anterior margin oblique and straight. Antenna 1 length is 8 – 9 / 10 of Antenna 2 length; Antenna 2 length is 2 / 3 body length. Pereon: without long dorsal setae. Gnathopod 1: coxa 1 roughly oval, distal margin rounded and fringed with long setae; basis long, slightly curved, approximately rectangular with many long setae, as long as ischium + merus + carpus, the merus, carpus and propodus bearing long setae; propodus oval. Gnathopod 2: coxa 2 approximately rectangular, distal margin straight with few setae; basis long, slightly curved, with many long setae, as long as ischium + merus + carpus; the merus, carpus and propodus bearing long setae; propodus oval. Pereopod 3: coxa 3 approximately rectangular, distal margin straight with few setae; basis, merus and carpus with long setae on the posterior margin; dactylus slender, curved and longer than propodus. Pereopod 4: coxa 4 heart-shaped, basis, merus and carpus with long setae on the posterior margin, and tuft of long setae on distal anterior margin of merus and propodus; dactylus slender, curved and shorter than propodus. Pereopod 5: coxa 5 rectangular, basis roughly rectangular with few setae on the anterior margin; carpus rectangular, anterior margin with few setae, posterior margin with rows of little spines, postero-distal lobe with short spines and a long one; propodus rectangular, longer than carpus, with few short setae on anterior margin, and long distal setae; dactylus short and curved. Pereopod 6: basis rounded with few short setae on the anterior margin; carpus rectangular, posterior margin with rows of little spines, postero-distal lobe ornamented with short spines and a very long one; propodus a little longer than carpus, with few short setae on anterior margin, and long distal setae; dactylus short and curved. Pereopod 7: basis narrow, anterior and posterior margin slightly concave, lobe not deflected, rounded with few long setae, not reaching the ischium-merus joint; ischium quadrangular; merus rectangular with an antero-inferior lobe, anterior and posterior margin ornamented with few little spines and long postero-distal setae; carpus oval, with spines on the anterior and posterior margin, anterior distal lobe developed; propodus and dactylus short and narrow. Pleon: without long dorsal setae. Epimeral plate 1: anterior margin oblique and straight, ventral margin and posterior margin straight, corners rounded. Epimeral plate 2: inferior and posterior margins slightly convex, postero-inferior corner rounded. Epimeral plate 3: anterior margin straight, posterior margin oblique and straight, inferior one slightly convex, anterior corner rounded, posterior corner slightly acute. Urosome: carina small. Uropod 1: the rami are long and slender, of unequal length (2 / 3). Uropod 2: rami short, of equal size, and armed with a row of spines on each ramus. Uropod 3: peduncle short and strong; rami of unequal length, ornamented with numerous setae. Telson: triangular, apically rounded, cleft on 2 / 3 of the length; two setae at the apex of each lobe.
diagnosis
Diagnosis. Blind species; body without long dorsal setae on the pereon, pleon and urosome; A 1 = 8 – 9 / 10 A 2, A 2 = 2 / 3 body; coxa 4 heart-shaped, Pereopod 7: basis narrow, anterior distal lobe of the carpus developed.
distribution
Distribution: North Atlantic Ocean; wide bathymetric range species: this species was collected at 2702 m depth (Stephensen, 1925), between 100 – 2900 m (Mills, 1971), between 156 – 1808 m, on sand, sandy silt, silty sand, muddy sand, gravely sand, gravely sandy silt (BIOICE samples), one specimen at 1024 m on bathyal mud in the south of the Bay of Biscay (Dauvin & Bellan-Santini, 1996). Taxonomic remarks. H. similis belongs to the sub-group of blind species with a narrow Pereopod 7 basis and without dorsal tuft setae, which includes six other species: H. abyssorum, H. vallifera, H. lodo, H. dauvini, H. bjarnii, and H. faroensis. It differs from these species by having: — Antennae: Antenna 1 = 8 – 9 / 10 Antenna 2, Antenna 2 = 2 / 3 body length; the antennae are longer than the body length for H. bjarnii; they are half body length for H. vallifera, H. dauvini, and H. faroensis; for H. lodo, A 1 = ped A 2, A 2 shorter than body (in Barnard, 1961). — Coxa 4 heart-shaped (also the case for H. bjarnii and H. vallifera); but square shaped for H. abyssorum, H. lodo, H. dauvini and H. faroensis. — Epimeral plates 3 with posterior margin oblique and straight (also for H. faroensis); slightly convex for H. bjarnii and H. dauvini; rounded for H. vallifera and H. lodo (not indicated by Chevreux 1908 for H. abyssorum). — Uropod 1: the rami are long and slender, of unequal length (2 / 3); the rami are subequal for H. bjarnii, H. vallifera; H. lodo and H. dauvini; they have the same size for H. abyssorum and H. faroensis.
materials_examined
Type species collected by the R. V “ Ingolf ”, one specimen, (sex?) length: 4.5 mm, Station 36: 61 ° 50 ’ N – 56 ° 21 ’ W, depth 2702 m, bottom: sediment type unknown. BIOICE material examined. Station 2314: nine specimens, 11 September 1992, depth 156 m, 63 ° 42.16 ’ N – 23 ° 03.50 ’ W; bottom: muddy sand. Station 2328: four specimens, 3 May 1993, depth 429 m, 63 ° 20.00 ’ N – 10 ° 57.00 ’ W; bottom: sand. Station 2616: four specimens, 11 July 1994, depth 535 m, 67 ° 11.38 ’ N – 16 ° 50.40 ’ W; bottom: sandy silt. Station 2873: one specimen, 22 August 1996, depth 555 m, 64 ° 37.41 ’ N – 27 ° 14.28 ’ W; bottom: gravely sand. Station 2946: two specimens, 28 August 1996, depth 229 m, 65 ° 47.90 ’ N – 25 ° 38.70 ’ W; bottom: sandy silt. Station 3026: five specimens, 8 July 1997, depth 564 m, 63 ° 53.96 ’ N – 12 ° 44.18 ’ W; sediment type unknown. Station 3099: two specimens, 21 August 1999, depth 229 m, 67 ° 11.02 ’ N – 21 ° 45.68 ’ W; bottom: gravely sandy silt. Station 3282: four specimens, 16 September 2001, depth 1808 m, 62 ° 48.00 ’ N – 16 ° 14.80 ’ W; bottom: sandy silt. Station 3531: two specimens, 9 September 2002, depth 1712 m, 62 ° 43.26 ’ N – 14 ° 34.70 ’ W; bottom: sandy silt. Station 3544: 16 specimens, 11 September 2002, depth 1632 m, 61 ° 33.005 ’ N – 13 ° 40.14 ’ W; bottom: gravely sand. Station 3598: one specimen, 10 September 2003, depth 768 m, 62 ° 17.37 ’ N – 26 ° 37.58 ’ W; bottom: silty sand. All specimens of these stations are females.
Name
- Homonyms
- Haploops similis Stephensen 1925