Cletocamptus spinulosus, 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 : 2887-2902

publication ID	https://doi.org/ 10.1080/00222930903374171
persistent identifier	https://treatment.plazi.org/id/1373879B-FFC6-FFC5-84F8-FA9C3113FA1B
treatment provided by	Felipe
scientific name	Cletocamptus spinulosus
status	sp. nov.

Treatment

Cletocamptus spinulosus sp. nov.

( Figures 25–37 View Figure 25 View Figure 26 View Figure 27 View Figure 28 View Figure 29 View Figure 30 View Figure 31 View Figure 32 View Figure 33 View Figure 34 View Figure 35 View Figure 36 View Figure 37 )

Type material

One female holotype (EMUCOP-200306-03) and 1 male allotype (EMUCOP- 200306-04) preserved in alcohol, 8 male (EMUCOP-200306-05, EMUCOP-200306-06, EMUCOP-200306-07, EMUCOP-200306-08, EMUCOP-200306-09, EMUCOP- 200306-10, EMUCOP-200306-11, EMUCOP-200306-12) and 8 female (EMUCOP- 200306-13, EMUCOP-200306-14, EMUCOP-200306-15, EMUCOP-200306-16,

EMUCOP-200306-17, EMUCOP-200306-18, EMUCOP-200306-19, EMUCOP- 200306-20) dissected paratypes, and 20 female, 66 male and 43 copepodite paratypes preserved in alcohol ((EMUCOP-200306-21). Collected in year 2005, near Caleta Olivia (46°28′912′S, 67°31′069′W); 11 m above sea level; salinity, 50‰ Coll. R. M. Warwick.

Type locality

46°28′912′S, 67°31′069′W (near Caleta Olivia), Province of Santa Cruz, Argentina .

Additional material

Forty-two females, 41 males and 18 copepodites preserved in alcohol (EMUCOP- 200306-22). Collected in year 2005, in Puerto Madryn City lagoon, Province of Chubut (42°46′742′S, 65°01′904′W); 20 m above sea level; salinity, 11.7‰ Coll. R. M. Warwick .

Etymology

The specific name makes reference to the presence of strong instead of slender and long spinules along posterior margin of P2- to P4-bearing somites.

Female

Habitus ( Figure 25A–B View Figure 25 ). Tapering posteriorly; total body length measured from tip of rostrum to posterior margin of caudal rami ranging from 800 to 1050 µm (mean, 911 µm; n= 16; holotype, 910 µm). Rostrum ( Figure 28A View Figure 28 ) defined at base, triangular, with pair of setules subapically and ornamented with small spinules distally on ventral surface. Posterior margin of cephalic shield with small spinules laterally, bare or with few spinules dorsally ( Figure 25A–C View Figure 25 ). 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 posterior margin and with strong and short spinules along posterior margin ( Figure 25A–B, D–F View Figure 25 ). Dorsal and lateral surface of first urosomite (P5-bearing somite) as in preceding somites ( Figure 25A–B, G View Figure 25 ). Genital doublesomite with subcuticular rib dorsally and laterally indicating former division between second and third urosomites ( Figures 25A–B View Figure 25 and 27A View Figure 27 ), but completely fused ventrally ( Figure 27B View Figure 27 ). 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 ( Figure 25A–B, H View Figure 25 ), ventrally with spinules as in Figure 27B View Figure 27 . Third urosomite (second genital somite) as in previous somite. Fourth and fifth urosomites as in previous somite dorsally, ventrally with spinular pattern as illustrated ( Figure 27B View Figure 27 ). 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 26A View Figure 26 ). Caudal rami about three times as long as wide, slightly tapering posteriorly; dorsal, lateral and ventral surfaces with spinules as illustrated ( Figure 26A–C View Figure 26 ); with seven elements.

Antennule ( Figure 28A View Figure 28 ). Six-segmented; surface of segments smooth except for spinular row on first segment. Armature formula, 1-(1), 2-(9), 3-(6), 4-(1+[1+ae]), 5-(1), 6-(10+[1+ae]).

Antenna ( Figure 29A View Figure 29 ). Small coxa furnished with spinules as shown. Allobasis armed with two well-developed abexopodal setae. Free endopodal segment with inner spinules proximally and subdistally; with two lateral inner spines and a slender seta (the latter indicated by arrow in Figure 29A View Figure 29 ) and five distal elements. Exopod onesegmented; about five times as long as wide; with few spinules and with one lateral and two apical setae (one of them reduced – indicated by arrow in Figure 29A View Figure 29 ).

Mandible ( Figure 29B View Figure 29 ). 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 29C View Figure 29 ). Robust; arthrite of praecoxa with one surface seta, seven distal spines and one spinulose lateral seta (the latter more slender than in other species in which this seta is very strong). 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 29D View Figure 29 ). 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 29E View Figure 29 ). 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 30A View Figure 30 ). 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 spines and between rami. Exopod threesegmented. Endopod two-segmented, slightly beyond EXP2.

P2 ( Figure 30B View Figure 30 ). 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 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 31A View Figure 31 ). 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 31B View Figure 31 ). 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 middle of EXP1; first segment very small; second segment about three times as long as wide, armed with two setae.

P5 ( Figure 28B View Figure 28 ). 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 4.

P6 ( Figures 26D View Figure 26 and 27B View Figure 27 ). 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 32 View Figure 32 ). 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 760 to 970 µm (mean, 854 µm; n = 13; allotype, 970 µm). Rostrum ( Figure 35A View Figure 35 ) dimorphic, more slender than in female. Cephalic shield ( Figure 32 View Figure 32 ) with more dense spinular rows along posterior margin than in female, interrupted medially. Pro- and urosomites with much less dense spinular ornamentation than in female; shape of spinules along posterior margins as in female. Caudal rami ( Figures 33A–B View Figure 33 and 34A–B View Figure 34 ) more slender than in female.

Antennule ( Figure 35A–C View Figure 35 ). 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-(8), 4-(7+[1+ae]), 5-(0), 6-(6+ae). Last segment with three teeth.

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

P1 ( Figure 36A View Figure 36 ). As in female except for inner projection of basis (the latter indicated by arrow in Figure 36A View Figure 36 ).

P2 ( Figure 36B View Figure 36 ). 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, except for comparatively shorter elements of ENP2 (outer spine dimorphic).

P3 ( Figure 37A–B View Figure 37 ). 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 small, nearly as wide as long; second segment with inner apophysis reaching slightly beyond third segment, the latter armed with two setae.

P4 ( Figure 37C View Figure 37 ). Praecoxa, coxa and basis as in P3. Exopod as in female except for stronger outer spines. Endopod as in female, but with comparatively shorter setae than in female.

P5 ( Figure 33C View Figure 33 ). Both legs fused medially. Exopod and baseoendopod fused. Baseoendopodal lobe only slightly longer than exopodal lobe; with three apical setae. Exopod with four setae plus outer seta of basis.

P6 ( Figure 33B View Figure 33 ). Represented by median plate. Without armature.

Variability

One female was observed to possess an aberrant right P1EXP3 with three elements only (without outer spine). One male possessed an aberrant (dwarfed) inner seta on P4ENP2. Another male lacked an inner seta on left P2EXP2. One male possessed an aberrant apical spine in right P3EXP3 and another male possessed a dwarfed right P4EXP3 with two outer spines only.