Cletocamptus pilosus, Gómez & Gee, 2009

Gómez, S. & Gee, J. Michael, 2009, On four new species of Cletocamptus Shmankevich, 1875 (Copepoda: Harpacticoida) from inland waters of Argentina, Journal of Natural History 43 (45 - 46), pp. 2853-2910 : 2862-2874

publication ID	https://doi.org/ 10.1080/00222930903374171
persistent identifier	https://treatment.plazi.org/id/1373879B-FFE9-FFE1-84CE-FE4C32EAFD1B
treatment provided by	Felipe
scientific name	Cletocamptus pilosus
status	sp. nov.

Treatment

Cletocamptus pilosus sp. nov.

( Figures 6–14 View Figure 6 View Figure 7 View Figure 8 View Figure 9 View Figure 10 View Figure 11 View Figure 12 View Figure 13 View Figure 14 )

Type material

One dissected female holotype ( USNM 264522 View Materials ), 1 dissected male allotype ( USNM 1010097 View Materials ), 11 female, 38 male and 2 female CV paratypes preserved in alcohol ( USNM 1010098 View Materials ), and 7 dissected female ( USNM 1123789 View Materials , USNM 1123790 View Materials , USNM 1123791 View Materials , USNM 1123792 View Materials , USNM 1123793 View Materials , USNM 1123794 View Materials , USNM 1123795 View Materials ) and male paratypes ( USNM 1123796 View Materials , USNM 1123797 View Materials , USNM 1123798 View Materials , USNM 1123799 View Materials , USNM 1123800 View Materials , USNM 1123801 View Materials , USNM 1123802 View Materials ). The vial containing this material was labelled as follows: Cletocamptus deitersi USNM 264522; Argentina, Province of Mendoza, Embalse Nihuil, on the Atuel River . Coll. S. Menú- Marque; Id. J. Ried; Delfino-Scheke, R. Jan 1986 ; Reid, J.W. Jul 1998.

Type locality

Embalse Nihuil, Province of Mendoza, Argentina .

Additional material

One dissected female (EMUCOP-200306-01), and three females and one male CV preserved in alcohol (EMUCOP-200306-02). Collected in year 2005, from a site near Puerto San Julian, Province of Santa Cruz (49°12′493′S, 67°44′712′W), 26 m above sea level, salinity 11.8‰. Coll R. M. Warwick

Etymology

The specific name ( pilosus = hairy) refers to the hairy appearance of the body dorsally and laterally.

Female

Habitus ( Figure 6A–B View Figure 6 ). Tapering posteriorly; total body length measured from tip of rostrum to posterior margin of caudal rami ranging from 515 to 685 µm (mean, 610 µm; n = 16; holotype, 585 µm). Rostrum ( Figure 8H View Figure 8 ) defined at base, triangular, with pair of setules subapically and ornamented with small spinules distally on ventral surface. Cephalic shield ( Figure 6A–B View Figure 6 ) with small spinules along its posterior margin. Dorsal and lateral surface of free thoracic somites (P2- to P4-bearing somites) with transverse rows of spinules, and with longer spinules along posterior margin. Dorsal and lateral surface of first urosomite (P5- bearing somite) with long spinules, and with spinules (shorter and stronger than in preceding somites) along posterior margin. Genital double-somite with subcuticular rib dorsally and laterally indicating former division between second and third urosomites ( Figure 6A–B View Figure 6 ), but completely fused ventrally ( Figure 7A View Figure 7 ); dorsal and lateral surface of second and third urosomites (first and second genital somites) with transverse rows of long spinules and with row of spinules along posterior margin, ventrally with spinules as illustrated ( Figure 7A View Figure 7 ). Fourth and fifth urosomites as in previous somite dorsally, with ventral spinular pattern as illustrated ( Figure 7A View Figure 7 ). Dorsal surface of anal somite with transverse rows of long spinules, and with dorsolateral spinules close to joint with caudal rami; rounded anal operculum furnished with two rows of long and slender spinules ( Figure 6C View Figure 6 ). Caudal rami about twice as long as wide and slightly tapering posteriorly; dorsal and ventral surface smooth, with few spinules close to base of seta V ventrally; with seven elements ( Figures 6A–D View Figure 6 , 7A View Figure 7 ).

Antennule ( Figure 8A View Figure 8 ). Six-segmented; surface of segments smooth except for two spinular rows on first segment. Armature formula, 1-(1), 2-(9), 3-(4), 4-(1+[1+ae]), 5-(1), 6-(9+[1+ae]).

Antenna ( Figure 8B View Figure 8 ). With small coxa. Allobasis armed with two abexopodal setae. Free endopodal segment with inner spinules proximally and subdistally; with a slender seta (indicated by arrow in Figure 8B View Figure 8 ) and two lateral inner spines, and five distal elements. Exopod one-segmented; about five times as long as wide; with few spinules and armed with one lateral and two apical setae (one of them reduced – indicated by arrow in Figure 8B View Figure 8 ).

Mandible ( Figure 8C–D View Figure 8 ). Robust; chewing edge with bi- and multicuspidate teeth, one pyriform element and one lateral seta. Palp one-segmented, with one slender seta; with a small seta arising nearby.

Maxillule ( Figure 8E View Figure 8 ). Robust; arthrite of praecoxa with one surface seta, seven distal spines and one spinulose and slender lateral seta. Coxa with some spinules and with two slender setae. Basis with some median spinules. Homology of the setae of basis, exopod and endopod difficult to define. Basis seemingly with three apical and two lateral setae, endopod and exopod seemingly represented by three and one setae, respectively.

Maxilla ( Figure 8F View Figure 8 ). Syncoxa with spinules along inner margin; with two endites with three setae each as illustrated. Allobasis drawn into strong claw bearing one accompanying seta. Endopod represented by three setae.

Maxilliped ( Figure 8G View Figure 8 ). Subchelate. Syncoxa with spinular rows as illustrated and with inner seta on distal corner. Basis unarmed; with one anterior and one posterior longitudinal row of spinules along inner margin; with small spinules medially and subapically. Endopod drawn into long and slender claw with one accompanying small seta.

P1 ( Figure 9A View Figure 9 ). Praecoxa with spinules close to joint with coxa. The latter with spinular rows as illustrated. Basis with inner and outer spine; with median spinular row, and with stronger spinules at base of inner and outer spines and between rami. Exopod three-segmented. Endopod two-segmented, longer than exopod.

P2 ( Figure 9B View Figure 9 ). Praecoxa and coxa as in P1. Basis as in P1 except for lack of inner spine in P2; with outer spine-like element. Exopod three-segmented and ornamented as illustrated; EXP2 and EXP3 with inner seta. Endopod two-segmented, reaching middle of EXP2; first segment small, nearly as wide as long and ornamented as illustrated; second segment long, about four times as long as wide, ornamented as depicted and armed with one outer spine, one apical setae and two inner elements.

P3 ( Figure 10A View Figure 10 ). Praecoxa and coxa as in P2. Basis as in P2 except for outer seta-like element. Exopod three-segmented; EXP2 with one, EXP3 with two inner setae. Endopod two-segmented, slightly beyond EXP1; ENP1 small, nearly as long as wide; ENP2 about four times as long as wide, with one outer spine, one apical and three inner setae.

P4 ( Figure 10B View Figure 10 ). Praecoxa, coxa and basis as in P3. Exopod as in P2, except for insertion site of inner seta of EXP3. Endopod two-segmented, reaching above middle of EXP1; first segment very small; second segment about three times as long as wide and armed with two setae.

P5 ( Figure 7B View Figure 7 ). Exopod and baseoendopod fused. Baseoendopodal lobe about two times longer than exopodal lobe; with one outer, one apical and four inner setae; relative length of setae as shown. Exopodal lobe with five setae plus outer seta of basis. The armature formula of female P1–P5 is presented in Table 2.

P6 ( Figure 7A View Figure 7 ). Represented by median plate in anterior half of second urosomite (first genital somite); each vestigial leg represented by one outer long seta and one inner tiny element. Copulatory pore in the middle of genital-double somite.

Male

Habitus ( Figure 11A–B View Figure 11 ). More slender than in female, with second and third urosomites distinct; total body length measured from tip of rostrum to posterior margin of caudal rami ranging from 420 to 615 µm (mean, 544 µm; n = 14; holotype, 590 µm). Rostrum as in female. Cephalic shield ( Figure 11A–B View Figure 11 ) as in female except for longer spinules along margin dorsally and laterally. Ornamentation of pro- and urosomites as in female except for less dense spinular ornamentation on male first urosomite and anal somite (compare Figures 6A View Figure 6 and 11A View Figure 11 , and 7A View Figure 7 and 12B View Figure 12 ). Caudal rami ( Figures 11A–B View Figure 11 and 12B View Figure 12 ) as in female.

Antennule ( Figure 12A View Figure 12 ). Subchirocer, six-segmented; surface of segments smooth except for more spinular rows on first segment. Armature formula difficult to define but probably as follows: 1-(1), 2-(9), 3-(6), 4-(10+[1+ae]), 5-(0), 6-(8). Last segment with three teeth.

Antenna, mandible, maxillule, maxilla and maxilliped (not shown). As in female.

P1 ( Figure 13A View Figure 13 ). As in female except for inner projection of basis (indicated by arrow in Figure 13A View Figure 13 ).

P2 ( Figure 13B View Figure 13 ). Praecoxa, coxa and basis as in female. Exopod as in female except for stronger outer spines and comparatively shorter elements on EXP 3 in male. Endopod as in female, except for dimorphic outer spine.

P3 ( Figure 14A View Figure 14 ). Coxa as in P2. Basis as in P2 except for outer seta-like element in P3. Exopod as in female except for dimorphic and stronger outer spines; EXP2 with one, EXP3 with two inner setae. Endopod dimorphic, three-segmented; first segment very small, about two times as wide as long; second segment with inner apophysis hardly reaching beyond third segment, the latter small and armed with two setae.

P4 ( Figure 14B View Figure 14 ). Coxa and basis as in P3. Exopod as in P2, except for insertion site of inner seta of EXP3. Endopod as in female, except for being comparatively smaller and with comparatively shorter setae than in female.

P5 ( Figure 14C View Figure 14 ). Both legs fused medially. Exopod and baseoendopod fused. Baseoendopodal lobe slightly beyond exopodal lobe; with three apical setae. Exopodal lobe with four setae plus outer seta of basis.

P6 ( Figure 12B View Figure 12 ). Represented by median plate. Without armature.

Variability

The female holotype was observed to possess two inner setae in P2 EXP3 . The male allotype was observed to possess three setae in P2 ENP2 View Materials (without inner seta) . Six female paratypes were dissected and the following was observed. One female possess three elements (one of them aberrant) in left P1 EXP3 and one inner seta in right P4 ENP2 View Materials . Another female showed an aberrant inner seta in right P1 ENP2 View Materials . One female showed an aberrant right P2 EXP3 . One female lacked the inner seta in left P3 EXP3 and another female showed the right P3 ENP2 View Materials with one inner seta. One female showed one inner seta in left P4 ENP2 View Materials . One male was observed to possess two inner setae in right P4 ENP2 View Materials .