Paralaophontodes anjae, George, 2017

George, Kai Horst, 2017, Phylogeny of the taxon Paralaophontodes Lang (Copepoda, Harpacticoida, Laophontodinae), including species descriptions, chorological remarks, and a key to species, Zoosystematics and Evolution 93 (2), pp. 211-241 : 212-213

Paralaophontodes anjae sp. n.

Locus typicus .

Puente Quilo, Canal de Quetalmahue, Chiloé Island, Chile, 41°51.671'S, 73°58.926'W, 0m (Fig. 1 ).

Material examined.

Female holotype, distributed over 10 slides, coll. no. 37103/1-10.

Etymology.

The specific epitheton " anjae " is given in fondly dedication to the author’s sister Mrs Anja George (Osorno, Chile); gender: feminine.

Description of female.

Habitus (Fig. 2A ) slender, cylindrical, slightly tapering backwardly, length from rostral tip to end of FR 746 µm. R (Figs 2A , 3A ) fused to cphth, triangular in shape, rostral tip distinct, small, accompanied by pair of pinnate sensilla and paired hyaline protuberances. Subapically on dorsal side with small tube pore. All body somites except telson dorsally with paired cuticular processes (labelled as DP [Dorsal Processes] I-IX). Cphth with medio- and postero-lateral extensions of moderate triangular shape. Dorsally with cuticular ridge bearing 3 pairs of sclerotized processes (joined to DP I in Fig. 2A ), the first of which carrying pinnate sensilla, the latter accompanied by paired bare sensilla at their bases. Between the middle pair of processes tuft of hair-like setules. Thoracic body somites laterally extended. Abdominal processes (DP VII-IX) “H” -like, partly ornamented with small cuticular “teeth” (Fig. 2A, A '). Last thoracic and first abdominal somite fused to form genital double somite; original boundary still visible from dorsal side. Telson smallest body somite, almost square. Anal operculum with small spinules at its apical margin, accompanied by pair of sensilla. FR (Figs 2A , 3B ) long and slender, approximately 7x longer than broad, with 7 setae: I and II standing close together, of almost same length; III subapically, slightly longer than I and II; IV basally fused with V; V longest seta, inserting apically; VI as long as I-II, arising apically at inner margin; VII subapically at dorsal side, tri-articulate.

A1 (Fig. 3A ) 4-segmented, all segments of approximately the same length. First segment apically with 1 unipinnate seta; second segment with eight bare setae; on posterior margin produced into moderate “bump” that carries several long spinules; third segment with 7 bare setae, two of which arising from pedestal together with aes; fourth segment laterally with 3 bare setae, subapically with 5 bare setae, four of which bi-articulated at base (1 seta broken in Fig. 3A ); apically an aes plus 2 bare setae.

Setal formula: 1/1; 2/8; 3/7+ aes; 4/10+ aes.

A2 (Fig. 4A ) with allobasis carrying a row of spinules and 1 small bare seta on abexopodal seta. Exp lost. Enp as long as allobasis, with 2 spines and tiny seta anteriorly; apically with row of spinules and with 2 spines, one of which unipinnate, and 3 geniculate setae, the outermost fused with 1 minute bare seta.

Md (Fig. 4B, B ') with small gnathobase bearing 4 teeth and 1 bare seta (Fig. 3B '); md palp 1-segmented, with 5 bare lateral setae and with 1 terminal bipinnate seta.

Mxl (Fig. 4C ) praecoxal arthrite armed with 5 strong spines and with 3 bare setae; additionally with 1 lateral and 2 surface setae. Coxa without spinules, terminally with 2 setae (one seta broken in Fig. 4C ). Basis without spinules, terminally with 2 bare setae, and 2 juxtaposed subterminal bare setae; exp and enp each represented by 1 seta.

Mx (Fig. 4D ) with 2 slender endites, both carrying 3 apical setae. Basis elongate, broken in Fig. 4D . Enp small, with 2 bare setae.

Mxp (Fig. 4E ) with unarmed syncoxa. Basis without ornamentation (but damaged apically), enp turned into long claw accompanied by small bare seta.

P1 (Fig. 5A, A ') with longitudinally elongated praecoxa, coxa and basis; praecoxa as long as coxa. Basis with 1 outer and 1 inner bare seta, which has moved towards the anterior surface. Exp 2-segmented, exp-1 with 1 unipinnate outer spine; exp-2 nearly twice as long as exp-1, laterally with 2, subapically with 1, and apically with 2 setae; all setae bare and geniculate. Enp 2-segmented, enp-1 massive, more than 3x longer than broad, without ornamentation; enp-2 half as long as enp-1, apically with strong claw, subapically on inner margin with 1 minute bare seta.

P2-P4 (Fig. 5B-D ). Intercoxal sclerites strongly reduced, triangular, not linking the counterparts. Bases transversely elongated, with 3-segmented exopods but lacking endopods. Bases with 1 outer seta and 1 tube pore on proximal margin. Exopods P2 and P3 as long as basis, exopod P4 slightly longer than basis; all exopodal segments except P4 exp-1 with outer spinules; exp-1 and exp-2 each with 1 outer bipinnate spine, exp-3 with 3 outer bipinnate spines, apically with 1 spine (comparatively short in P4) and 1 small seta. Setal formula of P2-P4 is given in Table 1 .

P5 (Fig. 2B ) with completely reduced benp, being represented by 2 bipinnate setae, the longer of which reaching insertion site of inner exopodal seta; baseoendopodal setae accompanied by 2 tube pores. Outer basal seta arising from long setophore, which is escorted by few long spinules and 1 long tube pore. Exp distinct, with 3 outer setae, 2 of which being bipinnate; subapically with inner bipinnate seta neighboured by tube pore; apically with bare seta reaching length of whole P5.

GF/P6 (Fig. 2C ) small, P6 fused to somite, consisting of 2 small bipinnate setae arising from slightly protruded lobes.

Male unknown.

Figures

Figure 1. Map showing the locus typicus (black star) of Paralaophontodes anjae sp. n. in Puente Quilo, Gulf of Quetalmahue, Chiloe Island, Chile.

Figure 2. Paralaophontodes anjae sp. n., female. (A) habitus, dorsal view; (A ') dorsal process IX; (B) P 5; (C) genital field. Scale bars: (A) 100 µm; (A', B, C) 50 µm.

Figure 3. Paralaophontodes anjae sp. n., female. (A) A 1 and rostrum, arrow showing insertion of aes and accompanying setae of counterpart; (B) telson and FR, ventral view, Roman numerals indicating furcal setae. Scale bar: 50 µm.

Figure 4. Paralaophontodes anjae sp. n., female. (A) A 2; (B) md; (B ') mandibular palp of counterpart; (C) mxl; (D) mx, proximal endite separated (arrow); (E) mxp. Scale bars: (A, E) 50 µm; (B, B' - D) 20 µm.

Figure 5. Paralaophontodes anjae sp. n., female. (A) P 1, claw broken; (A ') P 1 enp- 2 of counterpart; (B) P 2 showing rudimental intercoxal sclerite; (C) P 3; (D) P 4. Scale bar: 50 µm.