A new species of Catinia Bocquet & Stock, 1957 (Copepoda, Catiniidae) associated with mud shrimps, Axianassa australis Rodrigues & Shimizu, 1992 (Decapoda, Thalassinidea, Laomediidae), from Brazil Author Kihara, Terue C. Author Rocha, Carlos E. F. Author Santos, Cynthia text Zootaxa 2005 1039 39 55 journal article 50972 10.5281/zenodo.169785 f1e3e8f1-72cc-4573-bfc7-7a61b029cb16 1175­5326 169785 Catinia aiso sp. n. ( Figs. 1–11 ) Material examined . São Sebastião, Araçá Beach ( 23°48’50’’S , 45°23’48’’W ): 2 females , Sep. 19 1997 ; 11 females and 1 male , 22 Jan. 2000 , and 2 females and 1 male , 11 Mar. 2001 . All specimens from external surface of carapace and uropods of Axianassa australis in the intertidal zone; Cynthia Santos coll. Holotype (registration number: MZUSP 16462) and undissected paratypes ( MZUSP 16463) deposited in Museu de Zoologia, Universidade de São Paulo. Dissected paratypes in collection of Carlos E. F. Rocha (Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo). Female ( Figs. 1–5 , 6 A–C, 10). Total length, excluding setae on caudal rami, 0.7–0.8 mm (N=15). Body broadly ovoid ( Figs. 1 A, 10A–B), dorsoventrally compressed. Prosome longer than urosome (3.17:1). Cephalosome and free prosomites pitted ( Figs. 1 B, 10C), with sensilla pattern as shown in Fig. 1 A, and posterior borders smooth. Epimera of third and fourth pedigerous somites expanded posteriorly, lateral margins of epimera deeply serrate. Posterior margin of fourth pedigerous somite clearly incised medially. Urosome ( Figs. 1 C, 2A, 10D) 5­segmented, comprising fifth pedigerous somite, genital doublesomite and 3 free abdominal somites. Hyaline frills of second to fourth urosomites deeply indented. Somite bearing leg 5 ( Figs. 1 C, 2A) about 2.5 times wider than long in dorsal view, with 4 transverse rows of spinules on ventral surface and leg 5 arising ventrolaterally. Genital double­somite ( Figs. 1 C, 2A) slightly longer than broad, with 2 transverse rows of minute spinules and few sensilla on dorsal surface; densely covered with rows of spinules ventrally. Genital area ( Fig. 1 C) located dorsolaterally on each side. Anal somite ( Figs. 1 C, 2A–C) cleft medially, twice as wide as long, with pairs of setules and spinules on dorsal surface and row of strong spinules along posterior edge, both ventrally and laterally. Caudal ramus ( Figs. 2 A–C) slightly longer than wide and armed with 7 setae. Setae I and III bipinnate; setae IV and V strongly developed and bipinnate, seta V 3 times longer than seta IV; seta VI shortest; seta VII biarticulate at base and arising from minute dorsal pedestal, near inner posterior margin. Ramus with tiny spinules on inner margin and row of strong spinules along posterior margin ventrally. Rostrum ( Figs. 3 A, 10F) conspicuous only in ventral view, quadrangular. Antennule ( Figs. 3 A–C) 6­segmented. Segment 1 with spiniform, serrate, upwardcurved seta inserted on pedestal near posteroventral edge (arrowed in Figs. 3 B–C, 10E). Segment 2 longest. Segment 5 with aesthetasc fused basally to seta. Segment 6 with apical acrothek consisting of aesthetasc and 2 slender setae. Armature formula: 5, 13, 9, 4 + 1 aesthetasc, 2 + 1 aesthetasc, 7 + 1 aesthetasc. Antenna ( Figs. 3 D, 10F–G) 4­segmented. Segment 1 longest, with rows of setules along inner and outer margins; plumose seta and massive corrugated process ( Fig. 10 H, arrowed in Figs. 3 D, 10G) on distal corner. Segment 2 unarmed, segment 3 with pinnate seta, large pedunculate sucker ( Fig. 10 I), and flattened pinnate seta on distal edge. Segment 4 with row of fine spinules on outer corner; 4 geniculate setae at apex, two of them with setules terminally; 2 unipinnate subterminal outer setae, inner seta twice as long as outer. Labrum ( Fig. 4 A) conical, partly covering mandibles; rounded part with row of spinules. Mandible ( Figs. 4 A–B) consisting of elongate process bent 90° downward, with short subterminal spinules. Maxillule ( Figs. 4 A, 4C) 1­segmented, implanted on reinforced integumental area; armed with 1 lateral and 4 apical setae. FIGURE 1 . Catinia aiso sp. n. Female: A. habitus, dorsal; B. detail of cephalosome ornamentation, showing pits and tegumental glandular pores, dorsal; C. urosome, dorsal (scale bars 50 m). FIGURE 2 . Catinia aiso sp. n. Female: A. urosome, ventral; B. anal somite and caudal rami, dorsal; C. posterior margin of anal somite and caudal rami, ventral (scale bars 50 m). FIGURE 3 . Catinia aiso sp. n. Female: A. frontal part of cephalosome showing rostral area and pair of antennules (armature not represented), ventral; B. antennule (arrow indicating spiniform seta); C. antennule segment 1 (arrow indicating spiniform seta), posterior; D. antenna (arrow indicating massive process) (scale bars 50 m). FIGURE 4 . Catinia aiso sp. n. Female: A. oral area with labrum (Lbr), mandible (Md), maxillule (Mxl) and maxilla (Mx); B. mandible; C. maxillule articulating on reinforced integumental area; D. maxilla, anterior; E. maxilla, ventral (scale bars 25 m). FIGURE 5 . Catinia aiso sp. n. Female: A. leg 1; B. leg 2, with intercoxal sclerite; C. leg 4, with intercoxal sclerite (scale bars 50 m). FIGURE 6 . Catinia aiso sp. n. Female: A. leg 5, posterior; B. leg. 5, anterior; C. leg 6. Male: D. habitus, dorsal (scale bars 25 m). Maxilla ( Figs. 4 A, 4D–E) 2­segmented. Segment 1 elongate, slightly narrower distally and with row of spinules posteriorly along crest. Segment 2 forming an elongate process directed towards mouth, distal part folded and lamellar. Maxilliped absent. Legs 1–4 ( Fig. 5 ) biramous, with 3­segmented rami. Legs 2 and 3 differing only in size. Elements on coxa of legs 1–4 very variable; leg 1 ( Fig. 5 A) with stiff bipinnate seta; legs 2 and 3 ( Fig. 5 B) each with long plumose seta; leg 4 ( Fig. 5 C) with short pinnate seta. Basis of legs 1–4 elongate, inserted on coxa at angle of about 45, with plumose seta at outer distal corner, and row of spinules along distal rim between exopod and endopod; outer and inner margins each with row of sparse setules. Leg 1 basis with slightly curved inner spine, this spine serrate along its outer margin. Inner and outer margins of exopods and endopods of legs 1–4 ornamented with setules and spines as shown in Figs. 5 A–C. Leg 4 endopod segment 3 with 2 thick inner setae ornamented with stiff setules on distal 2/ 3, proximal seta about 1.25 times longer than distal seta; apical seta stiff, serrate and reaching midlength of inner distal seta. Armature formula as follows (Roman numerals representing spines, Arabic numerals representing setae):
Coxa Basis Exopod Endopod
Leg 1 0­1 1­I I­0; I­1; I,2,1,3 0­1; 0­1; 1,4
Leg 2 0­1 1­0 I­0; I­1; I,1,1,4 0­1; 0­1; 1,4
Leg 3 0­1 1­0 I­0; I­1; I,1,1,4 0­1; 0­1; 1,4
Leg 4 0­1 1­0 I­0; I­1; I,1,1,4 0­1; 0­1; 1,3
Leg 5 ( Figs. 6 A–B, 10D) 2­segmented. Basal segment with long seta armed with minute sparse spinules; ventral surface spinulose and with subterminal row of spinules ending at base of seta. Terminal segment 10 times longer than wide, with oblique rows of spinules on ventral surface running toward insertion sites of outer spines, plus row of spinules at apex. Armature consisting of 4 bipinnate spines, each with terminal flagellum. Leg 6 ( Fig. 6 C) consisting of 3 small setae. Male ( Figs. 6 D, 7–9, 11). Total length, excluding setae on caudal rami, 0.4 and 0.5 mm (N=2). Body cyclopiform ( Figs. 6 D, 11A). Prosome longer than urosome (2.28:1). Cephalosome and free prosomites with smooth posterior borders; integumental pores and sensilla as shown in Fig. 6 D. Epimera of second to fourth pedigerous somites weakly indented on lateral margin. Urosome ( Figs. 7 A–B) 6­segmented. Hyaline frills of second to fourth urosomites finely striated. Somite bearing leg 5 ( Figs. 7 A–B) with row of spinules on ventral surface; fifth legs arising ventrolaterally. Anal somite ( Figs. 7 A–B) with pair of sensilla on inner dorsolateral area and row of few thick spinules along posterior margin ventrally and laterally. FIGURE 7 . Catinia aiso sp. n. Male: A. urosome, dorsal; B. urosome, ventral; C. anal somite and caudal rami, dorsal (scale bars 25 m). FIGURE 8 . Catinia aiso sp. n. Male: A. cephalosome in ventral view, with rostrum (R), antennae (A2), labrum (Lbr), mandible (Md), maxillule (Mxl), maxilla (Mx), and maxilliped (Mxp) (antennules not shown); B. antenna; C. labrum (scale bars 50 m). FIGURE 9 . Catinia aiso sp. n. Male: A. maxilla, anterior; B. maxilliped, posterior; C. maxilliped segment 2, anterior; D. leg 5, dorsal; E. legs 5 and 6, ventral (scale bars 50 m). FIGURE 10 . Catinia aiso sp. n. Female: A. habitus, dorsal; B. habitus, ventral; C. Epimera of third pedigerous somite, showing deeply indented lateral margin, dorsal; D. urosome, dorsal; E. antennule segment 1 (arrow indicating spiniform seta), posterior; F. rostrum (R) and pedunculate suckers of antennae (A2), ventral; G. antenna (arrow indicating massive process); H. antenna, detail of the massive process; I. antenna, detail of the pedunculate sucker (scale bars: A–B, 200 m; C, 25 m; D, 100 m; E, 25 m; F–G, 50 m; H–I, 10 m). Caudal ramus ( Figs. 6 D, 7C) bearing 7 setae. Setae I, II and VI naked; seta V 4 times longer than seta IV; seta VII bipinnate. Ramus with spinules along lateral posterior edge. Rostrum ( Fig. 11 B) with rounded posterior margin. Antenna ( Figs. 8 A–B) with process on first segment less conspicuous than in female. Segment 3 with sucker, 1 bifid spine, 1 unipinnate seta and 1 long seta with small backwards­curved spinules. Labrum ( Figs. 8 A, 8C) with 2 rows of stiff spinules medially. Maxilla ( Figs. 8 A, 9A, 11C) produced into crest and ornamented with rows of spinules along posterior and distal margin of segment 1. Segment 2 as in female. Maxilliped ( Figs. 8 A, 9B–C, 11C) 4­segmented. Segment 1with seta on inner margin. Segment 2 with row of denticles along anterior surface; seta and row of spinules on inner distal margin, and 1 lateral seta on posterior surface. Segment 3 reduced and unarmed. Segment 4 long and narrow, claw­like with plumose apical seta and 2 proximal short setae. FIGURE 11 . Catinia aiso sp. n. Male: A. habitus, dorsal; B. rostrum, ventral; C. oral area with maxillule (Mxl), maxilla (Mx) and part of maxilliped (Mxp) (scale bars: A, 200 m; B–C, 25 m). Leg 5 ( Figs. 9 D–E) 2­segmented. Segment 1 partly fused to base, with 1 seta arising from pedestal. Terminal segment having 3 spiniform setae and 1 slender seta; and with rows of spinules ventrally at setal insertions. Leg 6 ( Fig. 9 E) represented by membranous opercular flaps, with spinules and 1 long seta. Etymology . — The specific name is derived from the Tupi­Guarani word aisó , meaning comely.