Ancorabolina galeata, 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 : 27-34

publication ID	https://doi.org/ 10.1111/j.1096-3642.2009.00567.x
persistent identifier	https://treatment.plazi.org/id/1E16879F-4F12-FFA2-FF24-7628FB1EF94D
treatment provided by	Felipe
scientific name	Ancorabolina galeata
status	sp. nov.

Treatment

ANCORABOLINA GALEATA SP. NOV.

Type locality: Eastern Mediterranean Sea, Anaximenes Mountain, multiple corer, station 891-3

during M71/1, 35°28.61′N, 30°15.15′E, depth 1254 m, collected on 15.xii.2006.

Material examined: (1) From type locality: Female holotype (coll. no. SMF 34176/1–21) and male allotype (coll. no. SMF 34177/1–18) from core 11 (4/5), dissected on 21 and 18 slides, respectively; 3 ♀ and 8 ♂ paratypes from core 11 (4/5), with 1 ♀ distributed over four slides (coll. no. SMF 34178/1–4) and other paratypes each on one slide (coll. nos SMF 34179–34188 About SMF ) ; 2 ♀ and 3 ♂ paratypes from core 9 (coll. nos SMF 34189–34193 About SMF ) ; 3 ♀ and 9 ♂ paratypes from core 11 (coll. nos SMF 34194– 34205 About SMF ); (2) Additionally , six paratypes were collected from Anaximenes Mountain with multiple corer at station 891-2 during M71/1, 35°28.61′N, 30°15.13′E, depth 1261 m, collected on 15.xii.2006 GoogleMaps : 1 ♂ from core 1 (coll. no. SMF 34206) , 1 ♂ from qualitative core (coll. no. SMF 34207) , 1 ♀ and 1 ♂ from core

11 (coll. nos SMF 34208, 34209 About SMF ), 2 ♀ from core 12 (coll. nos SMF 34210, 34211 About SMF ) .

Etymology: The species name galeata (Latin, helmeted) refers to the helmet-like cephalic shield, with the long rostrum representing the nose guard of the helmet.

Description: Female: Habitus ( Fig. 16A–C View Figure 16 ) long and slender. Total body length: 331–374 Mm (mean = 352 Mm; N = 5; measured from tip of rostrum to posterior end of furcal rami). Rostrum fused to cephalothorax and strongly elongate, curved ventrally, with paired sensilla subapically. Cephalothorax anteriorly slightly constricted, forming a ‘peak’ as described by George (2006b), and with sensilla and pores as figured. Posteriorly with paired lateral processes, which are strongly cuticularized and curved backwards. Posterior margin of cephalothorax with a pair of sensillate processes. 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 somite 1 with additional pair of sensilla just next to inner pair of sensillate processes. Free body somites 3–4 with one pair of sensilla and a row of small processes along posterior margins. Posterior margins of genital double-somite and following two urosomites serrate. Telson broader than long, with a few, fine spinules dorsally ( Fig. 21B View Figure 21 ), and trapezoid in lateral view ( Fig. 21C View Figure 21 ). Margin of anal operculum finely serrate.

Furcal rami ( Fig. 21A–C View Figure 21 ) long and slender, about eight 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. 21C View Figure 21 ), with spinules along outer margin and distally on dorsal surface.

Antennule ( Fig. 17A View Figure 17 ) five-segmented. Armature formula: 1, 7, 5 + (1 + aes), 1, 9 + (2 + aes). First segment about twice as long as wide, with spinules along inner margin. Second segment with several long spinules on a small, round bump near middle of outer margin. Second and third segments nearly equal in length, and slightly longer than first segment. Fourth segment shortest, nearly square in shape. Fifth segment slightly shorter than third one.

Antenna ( Fig. 17B View Figure 17 ) with allobasis; exopod absent; abexopodal margin of allobasis with short spinules and one slender, short seta. Endopod with several rows of spinules, laterally with two pinnate spines. Apical armature consisting of two pinnate 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. 17C View Figure 17 ) with strong gnathobase bearing several incised blades and one additional seta. Mandibular palp one-segmented, with two inner bipinnate, one outer, one subapical, and two apical setae.

Maxillule ( Fig. 18F View Figure 18 ). Praecoxal arthrite with two setae on anterior surface and several spinules on posterior surface. Apical armature consisting of six bare spines and one slender seta. Subapically with two pinnate spines. Coxal endite with one well-developed, pinnate spine and one slender, bare seta. Basis, endopod, and exopod fused, bearing eight setae.

Maxilla ( Fig. 18E View Figure 18 ). 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 segment. Distal endite with three pinnate setae, one of which is fused to endite. Basis drawn out into claw, accessory armature consisting of one pinnate and two bare setae. Endopod reduced and represented by two bare setae.

Maxilliped ( Fig. 18C, D View Figure 18 ) long and prehensile. Syncoxa with some outer spinules, apically with plumose seta and a short row of small spinules. Basis with two rows of long inner spinules, and a row of small outer spinules. Endopod drawn out into long, curved, pinnate claw with one accessory seta at base.

P1 ( Fig. 18A, B View Figure 18 ) with two-segmented endopod and three-segmented exopod. Praecoxa with spinules along distal margin. Coxa about 1.5 times as long as wide. Basis strongly prolonged transversely, with inner and outer seta, with spinules along inner and anterior margin and laterally from insertion of endopod. Exp-1 with outer spine, exp-2 with one geniculate outer seta, exp-3 with four geniculate setae. Exp-2 slightly longer than exp-1 and exp-3. Enp-1 slightly more than twice as long as exopod, with a row of long spinules along inner and outer margin. Enp-2 much smaller, subapically with a small, slender inner seta, apically with two bare setae (one claw-like and one geniculate).

P2–P4 ( Figs 19A–C View Figure 19 , 20A View Figure 20 ). Coxa short, nearly quadrangular. Basis transversely elongate, with one tube pore near middle of anterior surface. Outer basal seta of P3 longest, of P4 shortest, of P2 pinnate, of P3 and P4 bare. 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 with one inner seta. Enp-2 of P2–P4 with inner and outer spinules. Armature formula as in Table 1.

P5 ( Fig. 20B View Figure 20 ). Baseoendopod with long outer spinules. Endopodal lobe vestigial, with two small setae and one tube pore. One additional tube pore inserts close to the setophore. Exopod distinct and elongate, with one inner, two apical, and two outer setae, with one tube pore on anterior surface and with long spinules on posterior surface.

Genital field ( Fig. 21A View Figure 21 ). 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. 22A, B View Figure 22 ) as in female, but slightly more slender. Total body length: 316–340 Mm (mean = 328 Mm; N = 11; measured from tip of rostrum to posterior end of furcal rami). Urosome six-segmented, one spermatophore.

Antennule ( Fig. 23A–F View Figure 23 ) seven-segmented, subchirocer, with geniculation between segments 5 and 6. Armature formula: 1, 9, 7, 2, 11 + (1 + aes), 2 + 1 modified, 7 + (2 + aes). First segment nearly twice as long as wide. Second segment slightly longer than first segment. First segment with long spinules along inner margin, second segment with several long spinules on 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 is spiniform. Sixth segment with one modified element and two setae. Seventh segment with one aesthetasc and nine setae.

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

Endopod of P3 ( Fig. 24A View Figure 24 ) three-segmented. Enp-1 very small, without ornamentation. Enp-2 long and slender, with inner and outer spinules, apically with pointed outer apophysis reaching distal margin of enp-3. Enp-3 small with two apical setae. Exp-3 of P3 as in female, but with tube pore near insertion of proximal outer spine.

Endopod of P4 ( Fig. 24B View Figure 24 ) as in female, but additionally with one short subapical seta at outer side.

Baseoendopod of P5 ( Fig. 22C View Figure 22 ) as in female, but endopodal lobe with two tube pores. Exopod distinct and elongate, with one inner, two apical, and one outer setae, with one tube pore on anterior surface and long spinules on posterior surface.

Sixth pair of legs ( Fig. 22B View Figure 22 ) absent.