Haplostomella uniseriata, Kim & Boxshall, 2021

Kim, Il-Hoi & Boxshall, Geoff A., 2021, Copepods (Cyclopoida) associated with ascidian hosts: Ascidicolidae, Buproridae, Botryllophilidae, and Enteropsidae, with descriptions of 84 new species, Zootaxa 1, pp. 1-286 : 177

publication ID

https://doi.org/ 10.11646/zootaxa.4978.1.1

publication LSID

lsid:zoobank.org:pub:9C7C1723-73EB-4FBE-A47A-54627DEB8F93

DOI

https://doi.org/10.5281/zenodo.10530936

persistent identifier

https://treatment.plazi.org/id/3729879B-FF55-FF47-FA93-FECDD62D1AAF

treatment provided by

Plazi

scientific name

Haplostomella uniseriata
status

sp. nov.

Haplostomella uniseriata sp. nov.

( Fig. 114 View FIG )

Type material. Holotype ♀ (MNHN-IU-2014-21528) and 1 ♀ paratype (MNHN-IU-2014-17390, dissected) from bxçstçma ẚanthẚnum (Sluiter, 1909); Chuuk Island , OCDN 0900 -M (07°25.29’N, 151°49.02’E), depth 4 m, CRRF coll., 11 November 1992. GoogleMaps

Etymology. The name of the new species refers to the uniseriate arrangement of eggs within its egg sac.

Description of female. Body ( Fig. 114A View FIG ) vermiform, cylindrical, curved dorsally, and unsegmented; body length 1.53 mm, maximum width 250 μm. Cephalosome ( Fig. 114B View FIG ) 136×163 μm, narrower than metasomal re- gion, and incompletely defined from metasomal region by posterolateral margins of cephalic shield. Metasomal region bearing 5 pairs of dorsolateral folds at levels of legs 1-5, respectively, last pair smaller than anterior 4 pairs. Genitoabdomen ( Fig. 114C View FIG ) not defined from metasome; genital apertures large, positioned dorsolaterally; genital operculum with 3 teeth distally and 1 small palm-like element bearing 6 digits on ventral side ( Fig. 114N View FIG ). Abdomen ( Fig. 114C View FIG ) not articulated from, but distinctly defined from metasomal region by its narrowness, slightly longer than wide (67×62 μm). Caudal ramus ( Fig. 114D View FIG ) 1.9 times longer than wide (30×16 μm), almost rectangular, armed with 5 naked setae, 1 at middle of outer margin and 4 distally; largest distal seta 28 μm long, about twice as long as other 3. Egg sac ( Fig. 114E View FIG ) 590×155 μm, containing 5 or 6 uniseriate eggs; each egg about 125 μm in diameter.

Rostrum absent. Antennule ( Fig. 114F View FIG ) small, unsegmented, 64 μm long, armed with 7 setae on anterior margin and 6 setae plus 3 short aesthetascs on distal margin; 1 seta on distal margin more than twice length of other setae. Antenna ( Fig. 114G View FIG ) unsegmented, slender, curved, with 1 process-like seta subdistally on inner margin, plus 1 blunt process, 1 spinulose lobe and 1 seta distally.

Labrum ( Fig. 114H View FIG ) simple, semicircular. Mandible ( Fig. 114I View FIG ) unsegmented, lobate, tipped with elongate, acutely pointed spine. Maxilla ( Fig. 114J View FIG ) unsegmented, but consisting of short and broad proximal part and narrow digitiform distal part bearing 1 weakly pinnate seta subdistally. Maxilliped ( Fig. 114K View FIG ) 2-segmented; proximal segment unarmed; distal segment with 1 spine and 1 blunt process mediodistally; and ornamented with several rows of minute spinules on posterior surface; terminal claw simple.

Leg 1 ( Fig. 114L View FIG ) consisting of protopod, exopod, and endopod. Intercoxal plate ( Fig. 114L View FIG ) present between left and right legs, not sclerotized but distinct and broad, ornamented with several rows of minute spinules on anterior surface. Protopod bearing 1 seta on outer margin and 1 tubercle at inner distal corner. Exopod small, distinctly articulated from protopod, and distally bilobed; anterior lobe sclerotized and distally bifurcate; posterior lobe subcircular, tipped with 1 seta. Endopod well-defined, almost rectangular, longer than wide, with truncate and slightly bilobed distal margin. Legs 2-4 same as leg 1, but distal margin of endopods weakly trilobed. Legs 1-4 accompanied by small tubercle on ventral surface of body just lateral to each leg ( Fig. 114A, L View FIG ).

Leg 5 ( Fig. 114M View FIG ) as small lobe bearing 1 minute seta subdistally and 2 naked setae on distal margin.

Male. Unknown.

Remarks. The distal armature element on the mandible of e. unẚserẚata sp. nov. is a slender, straight spine by which the new species can be distinguished from its congeners, since in other species of eaplçstçmella the distal element is a robust claw in e. bçrealẚs; a curved spine in e. dẚstẚncta Ooishi & Illg, 1977 and e. çceanẚca Ooishi & Illg, 1977; a strong, spinulose blade in e. halçcynthẚae (Fukui, 1965); a single seta in e. dubẚa Ooishi & Illg, 1977, e. magellanẚca, e. malacçcera, and e. tuberculata; and it is absent in e. reducta. The mandible of eK australẚensẚs is unknown, but it has a large body size, 6.5 mm long in the female, a 3-segmented abdomen, and 2 distal setae on the maxilla ( Gotto, 1970), which serve to distinguish it from the new species.

Egg sacs are known in only five species of the genus eaplçstçmella, and all of these species have a multiseriate arrangement of eggs. The uniseriate arrangement of eggs in the egg sac of eK unẚserẚata sp. nov. also seems to be an unusual feature within the genus.

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