Adoginiceps camaxeni Gómez & Morales-Serna 2015, sp. nov.
Creators: name: Gómez, Samuel
name: Morales-Serna, Francisco Neptali
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Maxillopoda
Harpacticoida
Tetragonicipitidae
Adoginiceps
Adoginiceps camaxeni

description: Adoginiceps camaxeni sp. nov.
(Figures 21A–D, 22A–C, 23A–D, 24A, B, 25A–D, 26A, B)
Diagoniceps cf. monodi Chappuis and Kunz, 1955 in Gómez and Morales-Serna (2014, Appendix 1: 114)
Type locality
Ensenada del Pabellón, Sinaloa State; 24.3167 –24.5833 ° N, 107.4667– 107.75° W.
Type material
Adult male holotype, dissected (EMUCOP 030192–34); adult male paratype preserved in alcohol (EMUCOP 010591 –63).
Etymology
The generic name, Adoginiceps, is an anagram of Diagoniceps; the specific name, camaxeni, is an anagram of mexicana.
Description (based on the male only)
Female. Unknown.
Male. Habitus (Figure 21A) fusiform; tapering from posterior margin of cephalothorax to anal somite. Second and third urosomites not fused. Rostrum (Figure 21A) minute; fused to cephalothorax. Pro- and urosomites with pores, sensilla and small spinules dorsally and ventrally as depicted (Figure 21A, B). Anal somite (Figure 21A, B) as long as preceding somite; with rounded anal operculum flanked by two sensilla. Caudal rami (Figure 21A–D) with patches of minute spinules; elongate, about 7.4 times as long as wide; with seven setae as follows: seta I very small, ventral to seta II, the latter noticeably longer than the former, both situated just below first half of ramus; seta III about as long as seta II, situated subdistally on outer margin of ramus; seta IV slender and long, arising from outer distal corner; seta V strongest; seta VI very small, arising from inner distal corner; dorsal seta VII biarticulated, situated rather subdistally.
Antennule (Figure 22A). Eleven-segmented, haplocer; first segment not elongate; second segment slightly longer than broad, without any process; armature formula difficult to define, most probably as follows: 1(1); 2(11); 3(6); 4(10+(1+ae)); 5(0); 6(5); 7(1); 8(1); 9(2); 10(2); 11(6+(1+ae).
Antenna (Figure 22B). With basis about twice as long as broad, with small spinules as depicted. Exopod one-segmented, with three elements (apicalmost fused to exopod). First endopodal segment with one abexopodal seta arising rather proximally; second endopodal segment with medial and apical outer hyaline frills, with some minute inner spinules proximally; with one slender seta and two spines laterally, and with seven elements distally [one spiniform element, three geniculate single setae, one slender seta, and one genuiclate and one pinnate long seta (outermost elements) fused].
Mandible (Figure 23A, B). Gnathobase with bicuspidate teeth, four spines and one lateral pinnate seta. Coxa-basis with three transverse spinular rows and with three setae as shown. Exopod one-segmented, elongate, with two lateral and seven setae distally. Endopod one-segmented, elongate, shorter than exopod; with three lateral and three apical setae.
Maxillule (Figure 23C). Arthrite of praecoxa with two surface setae, two lateral elements and eight distal spines. Coxal endite with some spinules subdistally and with four apical setae. Basis with seven setae and with some spinules distally. Exopod one-segmented, elongate, with five setae. Endopod one-segmented, small, with three setae.
Maxilla (Figure 22C). Two distalmost endites of syncoxa with three setae each. Basis with two strong claws and three slender setae. Endopod one-segmented, with five setae.
Maxilliped (Figure 23D). Syncoxa with spinules as figured and with three setae. Basis with longitudinal row of inner spinules and with one inner seta; endopodal segment elongate, with long claw and two setae.
P1 (Figure 24A). Coxa large, with spinules as shown. Basis with spinules as figured, with outer long seta and inner shorter element. Exopod three-segmented; elongate, reaching middle of ENP1; first and second segments with outer spine; third segment with four elements. Endopod two-segmented; first segment elongate, about eight times as long as broad and about four times as long as second segment, with one inner strong element on distal third; second segment elongate, about four times as long as broad, with two apical elements.
P2 (Figure 24B). Coxa large, with spinules as shown. Basis with spinules as depicted, with outer seta. Exopod three-segmented; first segment without, second segment with inner seta; third segment with three outer spines and two apical elements; outer exopodal spines bare, probably sexually dimorphic, outer spines of EXP3 bent at tip. Endopod two-segmented, not reaching tip of EXP3; first segment small, slightly wider than long, with one strong inner element; second segment elongate, about four times as long as broad, with three distal elements (outermost fused to segment).
P3 (Figure 25A–C). Coxa large, with spinules as shown. Basis with spinules as depicted, with outer element (lost during dissection). Exopod three-segmented; first segment with, second segment without inner seta; third segment with three outer spines, two apical setae and one inner small element; two proximalmost outer spines of EXP3 probably sexually dimorphic, bare, bent at tip. Endopod two-segmented, reaching proximal third of EXP3; first segment small, nearly as long as broad, with one inner element; second segment elongate, with one inner, two distal and one outer element.
P4 (Figure 25D). Basis with outer seta. Exopod three-segmented; first segment with, second segment without inner seta; third segment with three outer small spines, two apical and two inner elements as shown. Endopod two-segmented, reaching proximal fifth of EXP2; first segment small, nearly as long as wide, with one inner element; second segment elongate, with one inner, two apical and one outer seta.
P5 (Figure 26A). Baseoendopods of both legs fused, with spinules as depicted; with outer basal seta; endopodal lobes with one inner and two apical spiniform elements each. Exopod elongate, about 2.3 times as long as wide, with two outer, two apical and one inner seta.
P6 (Figure 26B). Asymmetrical; left leg functional, right leg fused to somite; each with two slender setae and one inner spine.
Remarks
The material herein presented could not be attributed to any of the existing genera within Tetragonicipitidae. The Mexican material seems to occupy an intermediate position between Diagoniceps laevis and Diagoniceps monodi in Huys’ (1995) key, and keys out to D. monodi in Wells’ (2007) key. However, the Mexican material cannot be attributed D. monodi given the lack of inner armature in the P2EXP1 and P3EXP 1 in the new genus. The Mexican material did not fit the diagnosis by Huys (1995) and Fiers (1995), nor of any other genus within the family. Unfortunately, the female of the new species remains unknown and nothing can be said regarding its affinities or resemblance with other species and genera.
description: Published as part of Gómez, Samuel & Morales-Serna, Francisco Neptali, 2015, On a small collection of Tetragonicipitidae Lang, 1944 (Copepoda: Harpacticoida) from Mexico: new records and new species, pp. 2827-2868 in Journal of Natural History 49 (45) on pages 2859-2867, DOI: 10.1080/00222933.2015.1038329, http://zenodo.org/record/4002265