Cletocamptus fourchensis, Gómez & Fleeger & Rocha-Olivares & Foltz, 2004

Gómez, Samuel, Fleeger, John W., Rocha-Olivares, Axayácatl & Foltz, David, 2004, Four new species of Cletocamptus Schmankewitsch, 1875, closely related to Cletocamptus deitersi (Richard, 1897) (Copepoda: Harpacticoida), Journal of Natural History 38 (21), pp. 2669-2732 : 2710-2721

publication ID	https://doi.org/10.1080/0022293031000156240
DOI	https://doi.org/10.5281/zenodo.15675959
persistent identifier	https://treatment.plazi.org/id/AF0B87BC-FE0C-FFE3-FE10-FB97FD4CFCD3
treatment provided by	Felipe
scientific name	Cletocamptus fourchensis
status	sp. nov.

Treatment

Cletocamptus fourchensis sp. nov.

( figures 34–42 View FIG View FIG View FIG View FIG View FIG View FIG View FIG View FIG View FIG )

Cletocamptus deitersi ( Richard, 1897) sensu Fleeger (1980) , De Laune et al. (1984), Decho (1986, 1988), Chandler (1986), Chandler and Fleeger (1987), Sun and Fleeger (1994), Pace and Carman (1996), Carman et al. (1997, 2000).

Cletocamptus deitersi type II sensu Rocha-Olivares et al. (2001).

Cletocamptus from Port Fourchon , Louisiana sensu Castro-Longoria et al. (2003).

Type material

One female holotype ( USNM 1010505 ) and one male allotype ( USNM 1010506 ) preserved in alcohol, five dissected female paratypes ( EMUCOP- 1298-01 , EMUCOP- 1298-04 , EMUCOP- 1298-05 , EMUCOP- 1298-06 , EMUCOP- 1298-07 ), three female and five male paratypes ( USNM 1010507 ), two female ( EMUCOP- 1298-13 ) and four male paratypes ( EMUCOP- 1298-14 ) preserved in alcohol, and seven dissected male paratypes ( EMUCOP- 1298-02, EMUCOP- 1298-03 , EMUCOP- 1298-08 , EMUCOP- 1298-09 , EMUCOP- 1298-10 , EMUCOP- 1298-11 , EMUCOP- 1298-12). December 1998 ( Port Fourchon ) and January 1999 (Cocodrie), coll. A. Rocha-Olivares, J. W. Fleeger and D. Foltz.

Type locality Port Fourchon, Louisiana (29 ° 05.42 ’ N, 90 ° 05.8 ’ W) . Other sites

Cocodrie, Louisiana (29 ° 15.2 ’ N, 90 ° 39.8 ’ W); Graveline Bay, Mississippi (29 ° 15 ’ N, 91 ° 21 ’ W) (Carman et al., 2000).

Etymology

The species was named after the region (Port Fourchon) where the species was found.

Description

Female. Habitus ( figure 34 View FIG ) tapering posteriorly; total body length measured from tip of rostrum to posterior margin of caudal rami ranging from 560 to 725 M m (mean, 603 M m, N ~10; holotype, 567 M m). Rostrum set off, triangular, with pair of setules subapically. Cephalic shield ornamented with fine and long spinules along margin dorsolaterally. Dorsal and lateral surface of free thoracic somites (P2–P4 bearing somites) ornamented with transverse rows of minute spinules, with longitudinal row of small spinules and with long spinules along posterior margin. Dorsal and lateral surface of first urosomite (P5 bearing somite) with transverse rows of minute spinules, and with comparatively longer spinules along posterior margin. First and second genital somites distinct dorsally and laterally ( figure 34A, B View FIG ), completely fused ventrally ( figure 35A View FIG ); dorsal and lateral surface of first and second genital somite with transverse rows of minute spinules, with row of long spinules along posterior margin of both somites (spinules of second somite longer), and with relatively longer spinules laterally, ventrally ornamented with spinules as shown in figure 35A View FIG . Fourth and fifth urosomite as in second genital somite dorsally, except for fewer transverse rows on fifth urosomite, ventral surface ornamented with transverse rows of spinules as illustrated in figure 35A View FIG . Dorsal surface of anal somite ( figure 34A, C View FIG ) ornamented with few transverse rows of minute spinules and with dorsolateral strong spinules close to joint with caudal rami; rounded anal operculum without ornamentation; with median row of strong spinules laterally ( figure 34D View FIG ). Caudal rami ( figure 34A–D View FIG ) about 1.5 times longer than wide; dorsal and ventral surface smooth, except for inner set of spinules close to insertion site of seta VII and close to posterior margin dorsally and ventrally; with seven elements in all.

Antennule ( figure 36A View FIG ) six-segmented; surface of segments smooth except for two rows of spinules on first segment. Armature formula, 1-(1), 2-(9), 3-(6), 4- (1z[1zae]), 5-(1), 6-(9z[1zae]).

Antenna ( figure 36B View FIG ) with small coxa ornamented with two sets of spinules. Allobasis armed with two strong abexopodal setae. Free endopodal segment ornamented with inner strong spinules proximally and subdistally, and armed with two lateral inner spines and one slender seta, and five distal elements. Exopod one-segmented; about five times longer than wide; ornamented with few spinules, and armed with one lateral and two apical smooth setae.

Mandible ( figure 36C View FIG ) robust, ornamented with rows of spinules proximally; chewing edge with four strong teeth, a multicuspidate tooth, a pyriform element and a lateral pinnate strong seta. Palp small, one-segmented, with two long setae unequal in length, with a small seta arising nearby.

Maxillule ( figure 36D, E View FIG ) robust; arthrite of praecoxa ornamented with few spinules, armed with a surface seta, seven distal spines and one lateral strong seta, the latter ornamented with long spinules. Coxa ornamented with some spinules and armed with two slender setae. Basis ornamented with some median spinules, and armed with three apical setae; exopod and endopod represented by three setae each.

Maxilla ( figure 36F View FIG ): syncoxa ornamented with minute spinules along inner and outer margin; with two endites, each bearing three setae. Allobasis drawn into strong claw bearing one accompanying seta. Endopod represented by three setae.

Maxilliped ( figure 36G View FIG ) subchelate. Syncoxa ornamented by anterior and posterior rows of spinules and armed with a small seta on inner distal corner. Basis without armature and ornamented with two longitudinal rows of spinules anteriorly and posteriorly, and with few spinules close to joint with endopod. The latter drawn into long and slender claw with one accompanying small seta.

P1 ( figure 37A View FIG ): praecoxa ornamented with spinules close to joint with coxa. The latter ornamented with anterior transverse rows of spinules, with comparatively stronger spinules close to outer distal corner anteriorly, and with some spinules posteriorly. Basis ornamented with median row of spinules, and with stronger spinules at base of exopod, between rami and at base of inner spine of basis. Exopod three-segmented. Endopod two-segmented, second segment reaching beyond third exopodal segment. Armature formula as in table 1. View Table 1

P 2 View Table 2 ( figure 37B View FIG ): coxa ornamented with median row of small spinules and with strong spinules close to outer distal corner anteriorly, and with some spinules close to outer distal corner posteriorly. Basis ornamented with median set of spinules, with spinules between rami and with comparatively stronger spinules at base of exopod; outer element spine-like. Exopod three-segmented and ornamented as in figure 37B View FIG . Endopod two-segmented, reaching beyond the middle of second exopodal segment; first segment small, slightly wider than long and ornamented with some inner spinules; second segment ornamented with long spinules as shown in figure 37B View FIG , and armed with three elements in all. Armature formula as in table 1. View Table 1

P3 ( figure 38A View FIG ): praecoxa as in P1. Coxa ornamented with transverse rows of spinules, with strong spinules close to outer distal corner anteriorly and with slender and long spinules on outer distal corner posteriorly. Basis as in P2 except for seta-like outer element. Exopod as in P2. Endopod as in P2 except for relatively shorter second segment reaching proximal third of second exopodal segment. Armature formula as in table 1. View Table 1

P4 ( figure 38B View FIG ): praecoxa, coxa and basis as in P3. Exopod as in P3, except for armature formula of third segment (without inner seta). Endopod two-segmented, barely reaching tip of first exopodal segment; first segment small, slightly wider than long; second segment ornamented with inner and outer slender spinules and armed with two apical setae.

P5 ( figure 35B View FIG ): exopod and baseoendopod fused. Baseoendopodal lobe longer than exopod, ornamented with sets of inner and outer spinules, with spinules at base of apical seta; armed with one outer, one apical and four inner setae; relative length of setae as in figure 35B View FIG . Exopod ornamented with spinules as shown in figure 35B View FIG , and armed with five setae in all, plus outer seta of basis.

P6 ( figure 35A View FIG ) represented by median plate in anterior half of first genital somite, each vestigial leg represented by a long and slender seta. Copulatory pore in the middle of genital double segment.

Male. Total body length measured from tip of rostrum to posterior margin of caudal rami, ranging from 430 to 640 M m (mean, 539 M m, N ~15; allotype, 640 M m). Habitus ( figure 39A, B View FIG ), anal segment and caudal rami ( figure 39C, D View FIG ) as in female dorsally, except for some minute spinules along posterior margin of anal operculum. Ventrally as in female except for genital somite ( figure 40A View FIG ). Ventral ornamentation of third, fourth and fifth urosomites ( figure 40A View FIG ) coarser than in female.

Antennule ( figure 40B View FIG ) six-segmented; subchirocer. Last segment with two acute teeth.

Antenna, mandible, maxillule, maxilla and maxilliped (not illustrated) as in female.

P1 ( figure 41A View FIG ) as in female except for comparatively shorter endopod and dimorphic projection on inner distal corner of basis.

P2 ( figure 41B View FIG ) as in female except for relatively stouter outer spines of male exopod, dimorphic inner spine on male ENP 2, and relatively shorter apical setae on second endopodal segment.

Exopod of P3 ( figure 42A View FIG ) as in female except for relatively stronger outer spines. Endopod three-segmented; second segment with inner distal apophysis reaching beyond third endopodal segment, the latter reaching tip of first exopodal segment, with one inner and one apical seta relatively shorter than their female homologues.

P4 ( figure 42B View FIG ) as in female, except for stouter outer spines of exopod and relatively shorter setae of second endopodal segment.

Both P5 fused ( figure 40B View FIG ); exopod and baseoendopod fused. Exopod ornamented with spinules at base of outer seta of basis, at base of apical elements and along inner margin; with four setae. Endopodal lobe ornamented with spinules along outer and inner margin, and at base of apical setae; with three elements in all.

P6 ( figure 40A View FIG ) represented by plate; without armature.

Variability

Male. Paratype (EMUCOP-1298-03) possesses a reduced apical seta on right P1 ENP 2, and an abnormally swollen apical element on right P2 EXP 3; paratype (EMUCOP-1298-09) possesses an aberrant right P1 ENP 2, with two setae; the gap between innermost and adjoining seta of P5 BENP is larger in right P5 (EMUCOP-1298-09); paratype (EMUCOP-1298-10) possesses two and three setae on right and left P5 BENP, respectively; paratype (EMUCOP-1298-11) possesses one inner seta on left P2 ENP 1 and four setae on P5 BENP.

Female. Paratype (EMUCOP-1298-05) possesses a reduced inner seta on left P4 ENP 2; paratype (EMUCOP-1298-06) with three setae on both P4 ENP 2; paratype (EMUCOP-1298-07) possesses an abnormal inner distal seta on left P1 ENP 2 and a reduced seta on right P4 ENP 2.