Gallincola major Kim & Boxshall 2020, gen. et sp. nov.
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Copepoda
Cyclopoida
Notodelphyidae
Gallincola
Gallincola major

description: Gallincola major gen. et sp. nov.
(Figs. 373, 374)
Type material. Holotype ♀ (dissected and mounted on a slide, MNHN-IU-2014-21412) froma gallonthebranchial tissue of Microcosmus madagascariensis Michaelsen, 1918, the Philippines, 07 June 1905.
Etymology. The specific name refers to the larger body size of the new species comparedto the type species.
Descriptionoffemale. Body (Fig. 373A) similarto that of G. bisetatus gen. et sp. nov. Body length 2.90 mm. Prosome 1.95 mmlong, taperinganteriorly, unsegmented, but with 3 lateral constrictions defining cephalosome, first and second pedigerous somites and fused third and fourth pedigerous somites. Cephalosome and first pedigerous somite (Fig. 373B) much narrower thansecondpedigerous somite; fused thirdand fourth pedigerous somites swollen, nearly spherical, forming brood pouch. Freeurosome (Fig. 373C) slender, 4-segmented: genitalsomite short; 3 abdominalsomites 336×250, 273×205, and 295×159 μm, respectively. Last abdominal somite constricted at about 40% of length, marking trace of original articulation between third abdominal and anal somites; with deep posteromedial anal incision; ornamented with setules on lateral surfaces. Caudalramus (Fig. 373D) club-shaped, blunt, about 4.0 times longer than wide (121×30 μm), with narrow proximal part, covered with fine setules.
Rostrum (Fig. 373E) widerthan long, withrounded posteriormargin. Antennule (Fig. 373E) slender, 230 μm long, unarmed and unsegmented, but with traces of several articulations on posterior surface; anterior surface covered with fine setules. Antenna (Fig. 373F) 4- segmented; proximal 3 segments unarmed; last segment (secondendopodal segment) about 3.9 timeslongerthan wide (59×15 μm), ornamented with several fine setules; armedwith 5 smallsetae (arranged as 1, 2, and 2) plus small, strongly curved terminal claw.
Labrum missing. Mandible (Fig. 373G) with coxal gnathobase moderately broad; medial margin with 1 large distal, spiniform tooth, 2 small teeth in middle, and short proximal pectinate region: palp biramous with 1 broad, sparsely pinnate seta at mediodistal corner of basis; exopod with 5 naked setae (2 outer setae about half as long as 3 medial setae); endopod incompletely 2- segmented, with 1 broad, sparsely pinnate setaon first segment and 5 naked setae, including small outer seta, on second. Maxillule (Fig. 373H) with distally produced arthrite bearing 9 setae; coxa with 1 setaon epipodite, endite absent; basis with 1 naked seta on medial margin; exopod and endopod distinctly articulated from basis, exopodwith 4 pinnate setae, endopodwith 3 naked setae; middle seta distinctly longer than other 2. Maxilla (Fig. 373I) 4-segmented; syncoxawith 3, 1, and 2 large setae on first to third endites, respectively; basis with strong clawplus 1 large seta; endopod with 1 large setaon first segment and 2 small setae on second. Maxilliped unsegmented, elongate, armedwith 2 broad, pinnate setae distally, ornamented with scattered patches of fine setules.
Leg 1-4 (Fig. 374 A-D) small. Legs 1–3 biramous, with widely separated rami; exopods curved and unsegmented;endopod incompletely 2-segmented inleg 1, but unsegmented, lobate inlegs 2 and 3. Leg 4 represented by elongate lobe (exopod). Protopod 2-segmented in legs 1 and 2, but unsegmented in leg 3. Rami of leg 1 and exopod of leg 2 ornamented with numerous setules. Legs lacking inner coxal and outer basal setae. Leg 1 bearing inner distal seta on basis. Setation of rami: 2, 8, 8, and 6 (or 5) on exopods of legs 1–4, respectively; 1 on second endopodal segment of leg 1, 5 or 6 on endopod of leg 2, and 1 or 2 on endopod of leg 3. Leg 5 absent.
Male. Unknown.
Remarks. Gallincola major gen. et sp. nov. can be easily distinguished from G. bisetatus gen. et sp. nov. by the following character states: (1) the caudal ramus is longer, about 4.0 timeslongerthan wide, comparedto about 2.4 times longerthan wide in G. bisetatus gen. et sp. nov.; (2) the antennule is slender and unsegmented, compared to the broad and 7-segmented antennule in G. bisetatus gen. et sp. nov.; (3) the mandibular coxal gnathobase bears 1 large and 2 small teeth, compared to 1 large and 5 small teeth in G. bisetatus gen. et sp. nov.; (4) the first endopodal segment of the mandible is armed with 2 setae, compared to only a single seta in G. bisetatus gen. et sp. nov.; (5) the setae on the basis and endopod of the maxillule are naked, whereas these setae are pinnate in G. bisetatus gen. et sp. nov.; (6) the first and second endopodal segments of the maxilla are armed with 1 and 3 setae, respectively, comparedto 2 setaeon each segment in G. bisetatus gen. et sp. nov.; and finally, (7) the exopods of legs 1–4 are unsegmented, compared to 3-segmented in G. bisetatus gen. etsp. nov.
description: Published as part of Kim, Il-Hoi & Boxshall, Geoff A., 2020, Untold diversity: the astonishing species richness of the Notodelphyidae (Copepoda: Cyclopoida), a family of symbiotic copepods associated with ascidians (Tunicata), pp. 1-6 in Megataxa 4 (1) on pages 555-558, DOI: 10.11646/megataxa.4.1.1, http://zenodo.org/record/4591138