Cletocamptus tertius, 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 : 2874-2887

publication ID	https://doi.org/ 10.1080/00222930903374171
persistent identifier	https://treatment.plazi.org/id/1373879B-FFF5-FFD2-84C8-FD093772FA9B
treatment provided by	Felipe
scientific name	Cletocamptus tertius
status	sp. nov.

Treatment

Cletocamptus tertius sp. nov.

( Figures 15–24 View Figure 15 View Figure 16 View Figure 17 View Figure 18 View Figure 19 View Figure 20 View Figure 21 View Figure 22 View Figure 23 View Figure 24 )

Type material

One female holotype ( USNM 264521 View Materials ) preserved in alcohol, 1 male allotype ( USNM 1010095 View Materials ) preserved in alcohol, 10 dissected female ( USNM 1123805 View Materials , USNM 1123806 View Materials , USNM 1123807 View Materials , USNM 1123808 View Materials , USNM 1123809 View Materials , USNM 1123810 View Materials , USNM 1123811 View Materials , USNM 1123812 View Materials , USNM 1123813 View Materials , USNM 1123814 View Materials ) and 7 dissected male paratypes ( USNM 1123815 View Materials , USNM 1123816 View Materials , USNM 1123817 View Materials , USNM 1123818 View Materials , USNM 1123819 View Materials , USNM 1123820 View Materials , USNM 1123821 View Materials ), 58 female and 8 male paratypes preserved in alcohol ( USNM 1010096 View Materials ). The vial containing this material was labelled as follows: Cletocamptus deitersi USNM 264521; Argentina, Province of La Pampa, Santa Rosa , Laguna Don Tomás .

Type locality

Laguna Don Tomás, Santa Rosa, Province of La Pampa, Argentina .

Etymology

The specific epithet ( tertius = third) makes reference to the fact that this is the third species closely related to C. levis and C. assimilis sp. nov., with which it shares most character states.

Female

Habitus ( Figure 15A–B View Figure 15 ). Tapering posteriorly; total body length measured from tip of rostrum to posterior margin of caudal rami ranging from 555 to 725 µm (mean, 615 µm; n = 11; holotype, 625 µm). Rostrum ( Figure 17G View Figure 17 ) defined at base, triangular, with pair of setules subapically and ornamented with small spinules distally on ventral surface. Cephalic shield ( Figure 15A–B View Figure 15 ) with long spinules along the posterior margin dorsally and laterally. Dorsal and lateral surface of free thoracic somites (P2- to P4-bearing somites) with transverse rows of minute spinules, with row of tiny spinules close to and with longer spinules along posterior margin. Dorsal and lateral surface of first urosomite (P5-bearing somite) as in preceding somites, with stronger spinules along posterior margin. Genital double-somite with subcuticular rib dorsally and laterally indicating former division between second and third urosomites ( Figure 15A–B View Figure 15 ), but completely fused ventrally ( Figure 16A View Figure 16 ). Dorsal and lateral surface of second urosomite (first genital somite) with transverse rows of small spinules and with row of stronger spinules along posterior margin, ventrally with spinules as illustrated ( Figure 16A View Figure 16 ). Third urosomite (second genital somite) as in previous somite except for longer spinules dorsally and laterally, ventrally with spinules as illustrated ( Figure 16A View Figure 16 ). Fourth and fifth urosomites as in previous somite dorsally, with ventral spinular pattern as illustrated ( Figure 16A View Figure 16 ). 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 strong spinules ( Figure 15A–B View Figure 15 ). Caudal rami about three times as long as wide, not tapering posteriorly; dorsal and ventral surface smooth except for inner strong spinules and for some strong spinules close to seta IV and V ventrally ( Figure 16A View Figure 16 ); with seven elements.

Antennule ( Figure 17A View Figure 17 ). Six-segmented; surface of segments smooth except for two spinular rows on first segment. Armature formula, 1-(1), 2-(9), 3-(5), 4-(1+[1+ae]), 5-(1), 6-(9+[1+ae]).

Antenna ( Figure 17B View Figure 17 ). With small coxa. Allobasis armed with two small abexopodal setae. Free endopodal segment with inner spinules proximally and subdistally; with two lateral inner spines and a slender seta (indicated by arrows in Figure 17B View Figure 17 ) and five distal elements. Exopod one-segmented; about five times as long as wide; with few spinules and with one lateral and two apical setae (one of them reduced – indicated by arrows in Figure 17B View Figure 17 ).

Mandible ( Figure 17C View Figure 17 ). Robust; chewing edge with bi- and multicuspidate teeth, one pyriform element and one lateral seta. Palp one-segmented, with two slender setae; with a small seta arising nearby.

Maxillule ( Figure 17D View Figure 17 ). Robust; arthrite of praecoxa with one surface seta, seven distal spines and one spinulose and strong lateral seta. Coxa with two slender setae. 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 seta, respectively.

Maxilla ( Figure 17E View Figure 17 ). Syncoxa with spinules along inner margin; with two endites, each bearing three setae as illustrated. Allobasis drawn into strong claw bearing one accompanying seta. Endopod represented by three setae.

Maxilliped ( Figure 17F View Figure 17 ). Subchelate. Syncoxa with spinular rows as illustrated and with inner small seta on distal corner. Basis unarmed; with one anterior and one posterior longitudinal row of spinules along inner margin; with outer small spinules medially and subapically. Endopod drawn into long and slender claw with one accompanying small seta.

P1 ( Figure 18A View Figure 18 ). Praecoxa with spinules close to joint with coxa. The latter with spinular rows as illustrated. Basis with inner and outer spines; with median spinular row, and with stronger spinules at base of spines and between rami. Exopod threesegmented. Endopod two-segmented, reaching middle of EXP3.

P2 ( Figure 18B View Figure 18 ). Praecoxa and coxa as in P1. Basis as in P1 except for lack of inner spine in P2; outer element spine-like. Exopod three-segmented and ornamented as illustrated; EXP2 and EXP3 with inner seta. Endopod two-segmented, reaching proximal third 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 and one inner seta.

P3 ( Figure 19A View Figure 19 ). Praecoxa and coxa as in P2. Basis as in P2 except for outer seta-like element in P3. Exopod three-segmented; EXP2 and EXP3 with one inner seta. 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 one inner seta.

P4 ( Figure 19B View Figure 19 ). Praecoxa, coxa and basis as in P3. Exopod as in P2 and P3 except for lack of inner seta in P4EXP3. Endopod two-segmented, reaching distal third of EXP1; first segment very small; second segment about three times as long as wide, armed with two setae.

P5 ( Figure 16B View Figure 16 ). 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. Exopod with five setae plus outer seta of basis. The armature formula of female P1–P5 is presented in Table 3.

P6 ( Figure 16A View Figure 16 ). Represented by median plate in anterior half of second urosomite (first genital somite); each vestigial leg represented by one outer small seta, one median long element and one small inner element. Copulatory pore in the middle of genital-double somite.

Male

Habitus ( Figure 20 View Figure 20 ). 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 495 to 580 µm (mean, 534 µm; n = 9; allotype, 580 µm). Rostrum as in female. Cephalic shield ( Figure 20 View Figure 20 ) as in female. Ornamentation of pro- and urosomites as in female except for less dense spinular ornamentation on male pro- and urosomites (compare Figures 15A View Figure 15 and 20 View Figure 20 ). Caudal rami ( Figures 20–21 View Figure 20 View Figure 21 ) as in female.

Antennule ( Figure 22A–B View Figure 22 ). Subchirocer, six-segmented; surface of segments smooth except for two spinular rows on first segment. Armature formula difficult to define but probably as follows: 1-(1), 2-(9), 3-(6), 4-(7+[1+ae]), 5-(0), 6-(8+ae). Last segment with three teeth.

Antenna, mandible, maxillule, maxilla and maxilliped (not shown). As in female. P1 ( Figure 23A View Figure 23 ). As in female except for inner projection of basis (the latter indicated by arrow in Figure 23A View Figure 23 ).

P2 ( Figure 23B View Figure 23 ). Praecoxa, coxa and basis as in female. Exopod as in female except for stronger outer spines and comparatively shorter elements in the male EXP3. Endopod as in female.

P3 ( Figure 24A View Figure 24 ). 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. Endopod dimorphic, three-segmented; first segment very small, about two times as wide as long; second segment with inner apophysis reaching far beyond third segment, the latter armed with two setae.

P4 ( Figure 24B View Figure 24 ). Coxa and basis as in P3. Exopod as in female except for stronger outer spines. Endopod as in female, except for being comparatively smaller and with comparatively shorter setae than in female.

P5 ( Figure 22C View Figure 22 ). Both legs fused medially. Exopod and baseoendopod fused. Baseoendopodal lobe as long as exopodal lobe; with three apical setae. Exopod with four setae plus outer seta of basis.

P6 ( Figure 21 View Figure 21 ). Represented by median plate. Without armature.

Variability

One female was observed to possess three rows of inner spinules on right P4EXP3. Another female possesses a dwarfed outer spine on right P1ENP2, lacks inner seta on left P1EXP2, exhibits two inner rows of spinules on left P4ENP2 (one row in right P4ENP2), presents four elements plus outer seta of basis on right P5EXP and four spines on right P5BENP. Another female possesses two elements on right P1ENP2 (innermost aberrant) and three rows of inner spinules on right P4EXP3 (two rows on left P4EXP3), and lacks inner seta on left P2EXP3. Another female lacks inner seta on left P2ENP2, possesses an aberrant first endopodal segment (very small) and an aberrant innermost seta on second segment of right P4ENP, and an aberrant second endopodal segment on left P4. Another female possesses three inner rows of spinules on right P4EXP3 (only two rows on left P4EXP3). One male was observed to possess three inner rows of spinules on left P4EXP3 (only two rows on right P4EXP3).