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

description: Periproctia latirostris sp. nov.
(Figs. 131, 132)
Typematerial. Holotype (intact ♀, MNHN-IU-2014- 21261), paratype (intact ♀, MNHN-IU-2014-21262), anddissectedparatype (♀, figured) from Polysyncraton lacazei (Giard, 1872) (MNHN-IT-2008-7096 = MNHN A2/ POL /8), Portugal, Saldania coll.
Etymology. The specific name is a combination of the Latin lati (=broad) and rostrum (=snout), alluding to the broad rostrum of the new species.
Descriptionoffemale. Body (Fig. 131A) stout, 836 μm long. Dorsoventral depth 282 μm at middle of prosome. Pedigerous somites fused, but with weakly expressed dorsal tergites on second to fourth somites. Free urosome (Fig. 131B) about 0.35 times as long as prosome, 5-segmented, narrowingposteriorly: genital and 4 abdominalsomites 54×135, 52×101, 46×86, and 43×56 μm, respectively. First to third abdominal somites ornamented with rows of minute spinules on ventral surface. Anal somite highly sclerotized, surface smooth, without spinules. Caudalramus (Fig. 131C) about 1.6 times longer than wide (30×19 μm), armed with 3 claws (2 robust and 1 slender) and 3 naked setae; lengths of claws 24, 17, and 15 μm; lengths of setae 44, 29, and 29 μm.
Rostrum (Fig. 131D) widerthan long, 40×51 μm, tapering steeply towards small, beak-like apical process. Antennule (Fig. 131E) 120 μm long and 7-segmented; armatureformula 2, 14 (or 6, 10), 8+aesthetasc, 4+aesthetasc, 1, 4+aesthetasc, and 7+aesthetasc; articulation indistinct between terminal 2 segments; all setae naked. Antenna (Fig. 131F) moderately slender, 4-segmented; coxashortand unarmed; basiswith 1 large, pinnate seta (representing exopod) at outer distal corner; first endopodal segment with 1 naked seta on inner margin; compound distal endopodal segment about 3.6 timeslongerthan wide (65×18 μm), bearing 7 setae (including 1 pinnate seta and 5 blunt tipped setae) plus small terminal claw, one-third as long as segment.
Labrum missing. Mandible (Fig. 131G) with 5 teeth and 1 seta on coxal gnathobase; basis with 1 seta on medial margin; exopodwith 5 subequal setae; endopod indistinctly 2-segmented with 2 and 5 setae on first and second segments, respectively. Maxillule (Fig. 131H) with 7 setae on arthrite of precoxa, 1 on coxal endite, 2 on epipodite, 3 on basis, 3 onexopodand 4 on endopod. Maxilla (Fig. 131I) 5-segmented; syncoxawith 9 setae (arranged 3, 1, 2, and 3), 2 on basis, and 1, 1, and 3 on first to third endopodal segments, respectively. Maxilliped (Fig. 132A) unsegmented, armed with 8 medial and 2 apical setae.
Legs 1–4 (Fig. 132 B-E) each with 3-segmented exopod and 2-segmented endopod. Inner coxal seta absent in legs 1–4. Outer setaon basis large, longerthan exopod in leg 1, but small in legs 2–4. Exopod longer than endopod in legs 1 and 4, but rami similar in length in legs 2 and 3. Outer setae on exopods of legs 2–4 rod-shaped with blunt tip. Inner seta on second exopodal segment of legs 3 and 4 small. Armature formula for legs 1–4 as follows:
CoxaBasisExopodEndopodLeg 10-01-II-1; I-1; II, I, 40-0; 1, 2, 3Leg 20-01-01-1; 1-1; 3, 1, 50-1; 1, 2, 5Leg 30-01-01-1; 1-1; 2, 1, 50-1; 1, 2, 5Leg 40-01-01-1; 1-1; 2, 1, 50-1; 1, 2, 4
Leg 5 (Fig. 132B) small, consistingof protopod tipped with 1 seta and conical exopod tipped with apical seta; exopodal segment not articulated from protopod.
Male. Unknown.
Remarks. In having an inner seta present on the second exopodal segment of leg 4 P. latirostris sp. nov. is similarto P. stocki sp. nov. and P. acutirostris sp. nov., among the described species. However, these two species are easytodistinguishfrom P. latirostris sp. nov.: P. stocki sp. nov. has 4 claws and 2 setae on the caudal ramus, comparedto 3 + 3 in P. latirostris sp. nov. (Table 3), and P. acutirostris sp. nov. has 3-segmented endopods in legs 1–4 (vs. 2-segmented endopods). The broad rostrum of P. latirostris sp. nov. is also a characteristic feature serving to differentiate it from its congeners.
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 200-203, DOI: 10.11646/megataxa.4.1.1, http://zenodo.org/record/4591138