Cirolana undata, Schotte & Kensley, 2005

Schotte, Marilyn & Kensley, Brian, 2005, New species and records of Flabellifera from the Indian Ocean (Crustacea: Peracarida: Isopoda), Journal of Natural History 39 (16), pp. 1211-1282 : 1229-1232

Cirolana undata sp. nov.

( Figures 11 , 12 )

Material examined

Holotype: USNM 280282 , one male (6.5 mm), IIOE sta 437, off Somalia, 9 ° 259N, 50 ° 549E, 90 m, 16 December 1964 . Paratypes: USNM 280283 , two males, 14 ovigerous females, one female, same data as holotype .

Other material examined. USNM 280284 , one ovigerous female , IIOE sta 453, off Somalia, 9 ° 419N, 51 ° 039E, 47–49 m, 16 December 1964 . USNM 285232 , one male, four ovigerous females, two females , IIOE sta 408-D, off Mozambique, 16 ° 429S, 43 ° 199E, 150–300 m, 15 October 1964 .

Description

Male. Body length three times width. Cephalon slightly produced anteriorly, covering antennal bases, apically upturned in dorsal view; two dorsal, medial tubercles present, anterior of which low, rounded; posterior tubercle low, short, transverse ridge; interocular suture lacking. Pereon punctate. Pereonites 1–3 each with one, and pereonites 4–6 each with two transverse sutures. Pereonite 7, posterior border finely scalloped, largely concealing pleonite 1. Coxae 2–7 each with two prominent carinae. Pleonites 3–4 with several tiny tubercles on posterior border. Pleonite 4 bearing prominent tubercle middorsally. Pleotelson with slightly sinuous lateral margins, narrowly rounded apex bearing eight long, flat spine-like setae separated by long, slender setae.

Antennular peduncle articles 1 and 2 fused but suture slightly visible; article 3 about twothirds length of articles 1 and 2 combined; flagellum of eight articles; several aesthetascs each on articles 2–7. Antennal flagellum with 16 articles. Frontal lamina narrow, pentagonal, length nearly twice greatest width, lateral margins slightly incurved with submarginal depression. Maxilla 1 and 2 and mandible as figured.

Pereopod 1, merus with six stout, blunt setules and three more slender, bifid setae on posterior margin. Pereopod 2, merus with six stout, one bifid and three simple setules on posterior margin. Pereopod 7, posterodistal angles of merus and ischium each with two plumose setae and several long, simple spine-like setae, carpus bearing single fringed seta and eight stiff, simple setae at same angle. Penes absent; openings on sternite 7 separated by about 3% width of sternite.

Pleopod 1 endopod one-half width of exopod. Pleopod 2, appendix masculina long, slender, extending beyond apex of endopod by about 10% of length; apical one-sixth with sparse scales or setules. Pleopods 3 and 4 similar with four coupling hooks and four plumose setae on peduncles. Pleopod 5, endopod lacking setae. Uropodal peduncle, posterior margin sinuous. Uropodal endopod broadly rounded apically, bearing 11 spinelike setae interspersed with plumose setae; scattered short setae on dorsal surface. Uropodal exopod with four stiff, simple and several plumose setae on mesial margin; stiff setae lacking on lateral margin, with four to five tufts of slender setae at notches; apex entire, with long, simple setae of various lengths. Uropodal rami subequal in length, both extending beyond pleotelson by 20% of length of exopod.

Female. Similar to male, excepting sexual characteristics and having cephalon smooth, lacking tubercles.

Remarks

The scalloped border of pereonite 7 and the character and number of cephalic tubercles in the male serve to separate this species from its congeners, as well as the anteriorly produced cephalon.

Etymology

The specific name, from the Latin for ‘‘wavy’’, refers to the distinctive scalloped posterior border of pereonite 7.

Genus Eurydice Leach, 1815

Restricted synonymy. Eurydice Leach 1815, p 354 , 370; Jones 1971, p 201; Bruce and Jones 1978, p 396; Bruce 1986, p 11. Brusca et al. 1995, p 40.

Diagnosis

Pereonites 1 and 2 subequal in length. Pleonite 5 lateral margin not overlapped by pleonite 4. Antennular peduncle article 2 at right angles to article 1. Antenna peduncle with four articles. Frontal lamina reduced; clypeus with triangular blade projecting ventrally. Pereopods 5–7 with ischium to propodus flattened, setose. Pleopods rounded; endopod of pleopod 5 without setae. Appendix masculina inserted medially. Uropodal peduncle not produced.

Figures

Figure 11. Cirolana undata sp. nov. (A) Male, dorsal view; (B) male, lateral view; (C) maxilla 2; (D) maxilla 1; (E) frons; (F) pleotelson and uropods; (G) mandible; (H) maxilliped; (I) pleopod 1; (J) male pleopod 2; (K) pleopod 3.

Figure 12. Cirolana undata sp. nov. (A) Pereopod 1; (B) dactylus of pereopod 1; (C) pereopod 2; (D) anterior pleon in ventral view; (E) pleopod 4; (F) pleopod 5; (G) pereopod 7; (H) uropodal exopod.