Spongiopsyllus aramisi Farias, Santana, Neves & Johnsson, 2024, sp. nov.

Spongiopsyllus aramisi sp. nov. urn:lsid:zoobank.org:act: C56D7080-DC61-444A-B6D1-3B3619EC3C74 Figs 6–8, Tables 3–4 Diagnosis Body shield-form dorso-ventrally flattened, pedigerous somites three and four not fused. Antennule 16-segmented, presenting the fusions of the segments (III–VI, IX–XIII, XXIII–XXVIII), and aesthetasc on segment 14. Antenna with 4 spinules on outer, and 2 spinules on inner margins of the exopod segment, and endopod 2-segmented with 1 long and 1 short apical setae. Maxillule with 4 setae on inner lobe, and 4 setae on outer lobe. Maxilliped with endopod 3-segmented, showing 2 seta on first, one seta on second and one seta on third segment, with setal formula (2,1,1+claw). Etymology The tapered morphology of leg 1 endopodal segments, showing sharpened processes, inspired the species name referring to the swordsman ‘Aramis’, one of Alexandre Dumas’ characters from ‘ The Three Musketeers ’, a historical adventure novel written in 1844. Type material Holotype BRAZIL • ♀; Bahia, Todos-os-Santos Bay, Pedra Cardinal; 12°50′15″ S, 38°32′58″ W; 20 May 2017; L.C.C. Silvany leg.; manually collected, associated with the sponge Aplysina cauliformis (Carter, 1882); UFBA 3298. Paratypes BRAZIL • 3 ♀♀; same data as for holotype; UFBA 3299 to 3301. Description Female Body length (from cephalosome to the furcal rami) 1190 µm and body greatest width (cephalosome) 840 µm. Prosomal shield flattened (Fig. 6A), with radiating bands along outer margin. Pedigerous somites 2–4 free. Urosome (Fig. 6B) 4-segmented. Genital double-somite fused with fifth pedigerous somite, 175 µm long, with length:width ratio 1.2:1. Three postgenital somites present, all wider than long, 72 ×55, 70 × 30, 55 ×32 µm, respectively. Prosome:urosome length ratio 3:1. Caudal rami elongate, 108 µm long, with setules along medial-distal inner margin, and armed with 6 setae distally. Antennule (Fig. 7A) slender, 220 µm long (not including setae), and 16 segmented. Length of segments: 54, 20, 25, 7, 9, 13, 9, 10, 9, 9, 11, 10, 11, 12, 9 and 13 µm, respectively. Segmental homologies and setation as follows: I-1; II-2; III–VI-7; VII-2; VIII-2; IX–XIII-7; XIV-1; XV-2; XVI-2; XVII-2; XVIII-2; XIX-2; XX-2; XXI-1+ae; XXII-1; XXIII–XXVIII-7. All setae naked. Antenna (Fig. 7B) 226 µm long (including distal claw); coxa 36 µm long; basis 62 µm long. Exopod 1-segmented, 45 um long, with 1 small delgate distal seta, 2 distal spinules, and 4 on lateral margin. Endopod 2-segmented; first segment 54 µm long, unarmed; second segment 23 µm long, ornamented with row of setules along outer margin, and armed with 1 long seta and 1 small robust spine; distally slightly curved claw, 51 µm long. Oral cone 800 µm long, reaching prosomal distal margin (Fig. 6A). Mandible comprising stylet (Fig. 7C) and slender 2-segmented palp (Fig. 7D) measuring 36 and 67 µm long, respectively. Palp with second segment armed with 2 apical, smooth setae and ornamented with setules along outer margin. Maxillule (Fig. 7E) bilobed; inner lobe 80 µm long, armed with 3 setae, 2 longer and plumose. Outer lobe 42 µm long, armed with 4 setae and ornamented with setules along outer margin; all setae naked. Maxilla (Fig. 7F) with syncoxa and curved claw measuring both 152 µm long, respectively; distal claw tip perpendicularly curved. Maxilliped (Fig. 7G) 5-segmented, 326 µm long (excluding claw); syncoxa 80 µm long, unarmed; basis 122 µm long, unarmed. Endopod 3-segmented, 18, 20, and 32 µm long, respectively; first segment with 2, and second with 1 naked seta; third segment with seta and curved claw measuring 53 µm. P1–P3 (Fig. 8A–C) biramous, with 3-segmented rami. P4 (Fig. 7D) with 3-segmented exopod and endopod absent. Armature formula below (Table 3). First exopodal segment of P1 (Fig. 7A) with setules on outer margin, second and third segments with outer margins ornamented with spinules on exopod, and setules on endopod. First exopodal segment of P2 (Fig. 7B) also ornamented with setules on outer margin, outer margins ornamented with spinules on second exopodal segment, and with setules on endopodal segment, distal spines of third exopodal segment with long setules on inner margin. Exopodal segments of P3 (Fig. 7D) with spinules on outer margins, second segment with setules on inner margin. Outer margin of P4 basis (Fig. 7E) ornamented with spinules, exopodal segments of P4 also ornamented with spinules on outer margins, second segment with setules on inner margin, distal spines of exopod with long setules on inner margin. Free exopodal segment of P5 (Fig. 5E) elongate, curved, 207 µm long, reaching first postgenital somite, and armed with 2 distal and one medial outer seta. Male Unknown.