Periproctia latirostris, Kim & Boxshall, 2020

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), Megataxa 4 (1), pp. 1-6 : 200-203

publication ID	https://doi.org/ 10.11646/megataxa.4.1.1
DOI	https://doi.org/10.5281/zenodo.5699781
persistent identifier	https://treatment.plazi.org/id/03C487CB-EF96-3AFF-FCEF-FC75FDE6F813
treatment provided by	Plazi
scientific name	Periproctia latirostris
status	sp. nov.

Treatment

Periproctia latirostris sp. nov.

( Figs. 131 View FIGURE 131 , 132 View FIGURE 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 View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 131 ) widerthan long, 40×51 μm, tapering steeply towards small, beak-like apical process. Antennule ( Fig. 131E View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 131 ) 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 View FIGURE 132 ) unsegmented, armed with 8 medial and 2 apical setae.

Legs 1–4 ( Fig. 132 View FIGURE 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:

	Coxa	Basis	Exopod	Endopod
Leg 1	0-0	1-I	I-1; I-1; II, I, 4	0-0; 1, 2, 3
Leg 2	0-0	1-0	1-1; 1-1; 3, 1, 5	0-1; 1, 2, 5
Leg 3	0-0	1-0	1-1; 1-1; 2, 1, 5	0-1; 1, 2, 5
Leg 4	0-0	1-0	1-1; 1-1; 2, 1, 5	0-1; 1, 2, 4

Leg 5 ( Fig. 132B View FIGURE 132 ) 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.