Ancorabolina anaximenesi, Gheerardyn & George, 2010

Gheerardyn, Hendrik & George, Kai Horst, 2010, New representatives of the genus Ancorabolina George, 2006 (Copepoda, Harpacticoida, Ancorabolidae) including remarks on ancorabolid phylogeny, Zoological Journal of the Linnean Society 158 (1), pp. 16-55 : 20-26

publication ID	https://doi.org/ 10.1111/j.1096-3642.2009.00567.x
persistent identifier	https://treatment.plazi.org/id/1E16879F-4F1D-FFBB-FC54-777DFEE2F934
treatment provided by	Felipe
scientific name	Ancorabolina anaximenesi
status	sp. nov.

Treatment

ANCORABOLINA ANAXIMENESI SP. NOV.

Type locality: Eastern Mediterranean Sea , Anaximenes Mountain, multiple corer, station 898 (core 1) during M71/1, 35°28.77′N, 30°12.95′E, depth 914 m, collected on 16.xii.2006 GoogleMaps .

Material examined: (1) From type locality: female holotype (coll. no. SMF 34163/1–17) and male allotype (coll. no. SMF 34164/1–12) dissected on 17 and 12 slides, respectively. (2) Additionally, 11 paratypes were collected with multiple corer from Anaximenes Mountain during M71/1 : 1 ♂ (coll. no. SMF 34165) at station 897 (core 3) (35°28.80′N, 30°12.29′E, depth 904 m) on 16.xii.2006 GoogleMaps ; 1 ♂ (coll. no. SMF 34166) at station 898 (core 2) (35°28.77′N, 30°12.95′E, depth 914 m) on 16.xii.2006 GoogleMaps ; 2 ♀ and 2 ♂ (coll. nos SMF 34167–34169 View Materials , 34170 View Materials /1–2) at station 917 (core 2) (35°30.23′N, 30°8.97′E, depth 1965 m) on 18.xii.2006 GoogleMaps ; 2 ♀ (coll. nos SMF 34171, 34172 View Materials ) at station 929 (core 2) (35°29.50′N, 30°10.10′E, depth 1786 m) on 19.xii.2006 GoogleMaps ; 2 ♂ (coll. nos SMF 34173, 34174 View Materials ) at station 931 (core 2) (35°26.04′N, 30°9.90′E, depth 680 m) on 20.xii.2006 GoogleMaps ; 1 ♀ (coll. no. SMF 34175) at station 954 (core 1) (35°27.99′N, 30°17.30′E, depth 1544 m) on 23.xii.2006 GoogleMaps .

Etymology: The species name anaximenesi refers to the type locality of this species, Anaximenes Mountain, which itself refers to the Greek philosopher Anaximenes.

Description: Female: Habitus ( Fig. 7A, B View Figure 7 ) long and slender. Total body length: 294–367 Mm (mean = 328 Mm; N = 6; measured from tip of rostrum to posterior end of furcal rami). Rostrum ( Figs 7B View Figure 7 , 8E View Figure 8 ) fused to cephalothorax and elongate, curved ventrally, reaching distal end of first antennular segment in dorsal view, with paired sensilla inserted at two thirds of its length. Cephalothorax anteriorly slightly constricted, forming a ‘peak’ as described by George (2006b), with small projections laterally from insertion place of antennule, with sensilla and pores as figured. Posteriorly with paired lateral, slender processes, which are strongly cuticularized and slightly curved backwards ( Fig. 8D View Figure 8 ). Each process with a small projection along anterior border, at two thirds of its length. Posterior margin of cephalothorax with inner pair of sensilla, outer pair of small processes, and a row of fine setules. Free body somites 1–4 and anterior somite of genital double-somite with a single mediodorsal tube pore. Posterior margins of free body somites 1–2 with inner pair of sensillate processes and outer pair of sensilla between small processes. Free body somites 3–4 with a pair of sensilla and several small processes along posterior margins. Posterior margins of genital double-somite and following two urosomites strongly serrate. Telson broader than long, trapezoid in lateral view ( Fig. 11C View Figure 11 ), anal operculum with a row of spinules.

Furcal rami ( Figs 11C View Figure 11 , 12A, B View Figure 12 ) long and slender, about nine times as long as wide, with seven setae: I and II inserted closely together at posterior third of lateral margin; III inserted subapically; IV, V, and VI inserted apically; IV and V fused, V longest; VII inserted dorsally at distal margin. Outer margin with tube pore proximally. Furcal rami inserted at outer corners of telson and directed upwards ( Fig. 11C View Figure 11 ).

Antennule ( Fig. 8A View Figure 8 ) five-segmented. Armature formula: 1, 8, 5 + (1 + aes), 1, 9 + (2 + aes). First segment slightly elongate (three times as long as wide), with several long spinules along inner surface. Second segment with several long spinules on a small, round bump near middle of outer margin. Second and third segments both nearly equal in length to first segment. Fourth segment shortest, nearly square in shape. Fifth segment slightly shorter than third one.

end, endopod; exp, exopod, P1–5, first to fifth thoracopods.

Number of exopodal segments in P1, swimming leg setal formulae of P2–P4 and number of exopodal and endopodal setae in P5.

Antenna ( Fig. 8B, C View Figure 8 ) with allobasis; exopod absent; abexopodal margin of allobasis with spinules and one slender seta. Endopod with several spinules, laterally with two pinnate spines. Apical armature consisting of two unipinnate spines, three long geniculate setae, and one small bare seta (fused basally to seta next to it). Subapically with two cuticular spinular frills.

Mandible ( Fig. 9A View Figure 9 ) with strong gnathobase bearing several incised blades and one additional seta. Mandibular palp one-segmented, with two inner bipinnate setae, one outer, one subapical, and two apical setae.

Maxillule ( Fig. 9B View Figure 9 ). Praecoxal arthrite with two setae on anterior surface; apical armature consisting of six bare spines and one slender seta; subapically with two spines. Coxal endite with one welldeveloped, pinnate spine and one slender, bare seta. Basis, endopod and exopod fused, bearing eight setae.

Maxilla ( Fig. 9C View Figure 9 ). Syncoxa bearing two endites, with long spinules along outer and short spinules along inner margin. Proximal endite with two setae and one unipinnate spine fused to endite. Distal endite with three setae, one of which is plumose. Basis drawn out into a unipinnate claw, accessory armature consisting of three setae. Endopod reduced and represented by two bare setae.

Maxilliped ( Fig. 9D View Figure 9 ) long and slender, prehensile. Syncoxa apically with a plumose seta and a row of spinules. Basis with a few, long inner and outer spinules. Endopod drawn out into a long, curved, pinnate claw with one accessory seta at base.

P1 ( Fig. 9E View Figure 9 ) with two-segmented endopod and exopod. Coxa about 1.5 times as long as wide. Basis about 1.5 times longer than coxa, slightly prolonged transversely, with inner and outer seta. Exp-1 with outer spine, exp-2 with five geniculate setae. Enp-1 nearly three times longer than exopod, with a row of long spinules along inner margin and a row of short spinules along outer margin. Enp-2 much smaller, subapically with a minute seta along inner margin, apically with two bare setae (one claw-like and one geniculate).

P2–P4 ( Figs 10A, B View Figure 10 , 11A, B View Figure 11 ). Coxa short, nearly quadrangular. Basis transversely elongate, with one tube pore in proximal half of anterior surface. Outer basal seta of P3 longest, of P4 shortest. Exopods three-segmented, outer spines elongate. Endopods two-segmented; first segment very small, without ornamentation. Enp-2 of P2–P4 very long, with two apical setae, enp-2 of P3–P4 additionally with one inner seta. Enp-2 of P2 with inner spinules, of P3–P4 with inner and outer spinules. Armature formula as in Table 1.

P5 ( Fig. 12C View Figure 12 ). Baseoendopod with long outer spinules. Endopodal lobe vestigial, with two small setae and two tube pores. One additional tube pore inserts close to the setophore. Exopod distinct and elongate, with one inner, two distal, and two outer setae, with one tube pore on anterior surface and with long outer spinules.

Genital field ( Fig. 12A View Figure 12 ). P6 represented by two small cuticular plates.

Male: The male differs from the female in the following characters: body smaller, second and third urosomite not fused, shape of antennule, endopods of P3 and P4, P5.

Habitus ( Fig. 13A, B View Figure 13 ) as in female, but slightly more slender. Total body length: 263–340 Mm (mean = 294 Mm; N = 6; measured from rostrum to posterior end of furcal rami). Urosome six-segmented, one spermatophore.

Antennule ( Fig. 14A–E View Figure 14 ) seven-segmented, subchirocer, with geniculation between segments 5 and 6. Armature formula: 1, 9, 7, 2, 11 + (1 + aes), 2 + 1 modified, 8 + (2 + aes). First and second segment elongate and of almost the same length. First segment with long spinules along inner margin, second segment with several long spinules on a small, round bump near middle of outer margin. Third segment much smaller than preceding ones, fourth segment smallest. Fifth segment slightly swollen, with one long aesthetasc and 12 setae, one of which bulbous. Sixth segment with one modified element and two setae. Seventh segment with one aesthetasc and ten setae, one of which is very slender.

Antenna, mandible, maxillule, maxilla, maxilliped, P1–P2, exopod of P3, exopod of P4, and furcal rami as in female.

Endopod of P3 ( Fig. 15A View Figure 15 ) three-segmented. Enp-1 very small, without ornamentation. Enp-2 long and slender, with inner and outer spinules, apically with lanceolate outer apophysis reaching distal margin of enp-3. Enp-3 small with two apical setae.

Endopod of P4 ( Fig. 15B View Figure 15 ) as in female, but additionally with one subapical, short outer seta.

Baseoendopod of P5 ( Fig. 13C View Figure 13 ) as in female. Exopod distinct and elongate, with one inner, two distal, and one outer setae, with one tube pore on anterior surface and long spinules on posterior surface.

Sixth pair of legs ( Fig. 13B View Figure 13 ) absent.

Variability: In two females and three males (coll. nos SMF 34168, 34171 View Materials , 34166 View Materials , 34173 View Materials , 34174 View Materials ), the rostrum and both posterior processes of the cephalothorax were less developed. The rostrum ( Fig. 11D View Figure 11 ) reached to the middle of the first segment of antennule and did not curve ventrally. The processes ( Fig. 11E View Figure 11 ) were shorter and did not show the small projection along the anterior border. However, as all other characters agree completely with the holotype and allotype , these differences are regarded as intraspecific variability and the respective specimens are included as paratypes.