Periproctia Stock 1967
Creators: name: Kim, Il-Hoi
name: Boxshall, Geoff A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Copepoda
Cyclopoida
Notodelphyidae
Periproctia

description: Genus Periproctia Stock, 1967
Diagnosis: Prosome comprising cephalosome defined by cephalicshieldandfusedfirsttofourth pedigeroussomites, togetherformingbrood pouch.Pedigerous somitesdefined only by dorsal tergite; fifth pedigerous somite fused to fourth. Free urosome comprising genital and 4 abdominal somites. Anal somite with pair of highly sclerotized, ventral protuberances referred to as “periproctal ring” by Stock (1967) or “perianal ring” by Illg & Dudley (1961). Caudal rami armed with 2 to 4 claws and 2 to 4 setae (total of 6). Antennule 6- to 8-segmented. Antenna 4- segmented; basis with plumose seta representing exopod (rarely absent); compound distal endopodal segment armedwith 9 setae plusterminal claw. Mandible with 5 teeth and 0/1 seta on coxal gnathobase; basis with 1 seta onmedial margin; exopod 2-segmented and armedwith 5 setae (3 on first and 2 on second segment); endopod armed with 2 and 5 or 6 setae on first and second segments, respectively. Maxillule armedwith 5 to 9 setaeon arthrite, 1 on coxal endite (rarely absent), 1 or 2 on epipodite, 2 or 3 on medial margin of basis, 3 on exopod, and 4 on endopod. Maxilla 5-segmented; syncoxawith 3, 1, 2, and 4 setae on first to fourth endites, respectively, 2 setae on basis, and 1, 1, and 2/3 setae on first to third endopodal segments, respectively. Maxilliped unsegmented with 6 to 8 medial plus 1 or 2 apical setae. Legs 1–4 with 3- segmented exopods and 2- or 3-segmented endopods. All legs lacking inner coxal seta. Outer seta on basis very large in leg 1, but small in legs 2–4. Three distal setae on endopod of leg 1 enlarged. First and second exopodal segments of legs 2–4 typically with bifurcate or trifurcate outer distal corners. Third exopodal segments of legs 3 and 4 elongate. Armature formula typically as follows:
CoxaBasisExopodEndopodLeg 10-010-01-II-0/1; I-0/1; II, I, 3/40-0; 1, 2, 2/3Leg 20-020-01-01-1; 1-1; 3, 1, 50-0/1; 1, 2, 5Leg 30-030-01-01-1; 1-0/1; 2, 1, 50-0/1; 1, 2, 5Leg 40-040-01-01-0/1; 1-0/1; 2, 1, 50-0/1; 1, 2, 3/4
Leg 5 consisting of protopod with outer seta and free exopodal segment with apical seta.
Type species: Periproctia biuncata Stock, 1967, by original designation.
Remarks. Stock (1967) considered that the material of Bonnierilla arcuata Brément, 1909 described by Illg & Dudley (1961) was not conspecific with Brément’s species. He designated this material as a new species, P. falsiarcuata Stock, 1967 and placed it in a new genus, Periproctia. This genus takes its name from the modification of the anal somite into the periproctal ring. We agree with this generic placement but we treat P. falsiarcuata as a species inquirendum because was inadequately described and cannot be recognized.
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 page 194, DOI: 10.11646/megataxa.4.1.1, http://zenodo.org/record/4591138