Halectinosoma mandibularis Clément & Moore 2007, SP. NOV.

• Main Authors: Clément, Michel, Moore, Colin G.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Hexanauplia; Harpacticoida; Ectinosomatidae; Halectinosoma; Halectinosoma mandibularis; Arctic
• Online Access: https://doi.org/10.5281/zenodo.10544965; http://treatment.plazi.org/id/876D87C62159730DFCDEFC69778AF8A4

HALECTINOSOMA MANDIBULARIS SP. NOV. Type material: 1♀ holotype dissected on three slides (NHM1990.425), 1♀ paratype dissected on slide (NHM1990.426), collected by grab from the North Sea (site S58). 1♂ paratype dissected on two slides (NHM1990.427), 1♂ paratype in tube (NHM1990.1219), collected by C. G. Moore by grab from off Banyuls, France (site S65). Other material examined: England: S85 (1♀ in tube NHM1990.1218). France: S65 (1♂ in tube NHM1990.1220). Description of female holotype Length: Habitus 1195 µm; sum of all somites 1380 µm; cephalothorax 400 µm; genital doublesomite 185 µm. Habitus fusiform (Fig. 1A). Colour of preserved specimen dark brown. Surface of cuticle densely covered with small pores. Cephalothorax gradually attenuating anteriorly. Rostrum broadly rounded and partially fused at base with cephalothorax and furnished with two small sensilla subapically. Genital double-somite with a short, transverse chitinous stripe ventrally and divided dorsally by a suture reaching ventro-laterally. Penultimate somite with rounded pseudoperculum. Caudal ramus (Fig. 1B, C). Nearly 1.5 times as long as broadest width. Principal setation and general form as in H. pseudosarsi Clément & Moore, 1995. Somitic ornamentation (Fig. 1A–C). Body somites, except penultimate, sparsely furnished with sensilla and pores. Posterior margin of cephalothorax, first and second free thoracic somites unadorned. Surface of first and second free thoracic somites with one and two rows of fine spinules, respectively. Posterior margin of third free thoracic somite and first urosomite finely crenulated. The surface of third free thoracic somite with two rows of fine spinules, first urosomite with two rows of lappet-like spinules and one row of fine spinules anteriorly. Genital double-somite with a complex arrangement of rows of fine spinules and posteriorly with two rows of lappet-like spinules and a semi-incised subulate hyaline frill. Fourth urosomite with a similar hyaline frill to preceeding somite and furnished with one row ...