Cirolana fasfes, Sidabalok & Bruce, 2018

Sidabalok, Conni M. & Bruce, Niel L., 2018, Review of the Cirolana ‘ pleonastica-group’ (Crustacea: Isopoda: Cirolanidae) with description of four new species from the Indo- Malaysian region, Raffles Bulletin of Zoology 66, pp. 177-207 : 191-197

Cirolana fasfes , new species

( Figs. 9–12 )

Material examined. All Indonesia: Holotype, male (7.4 mm) ( MZB Cru.Iso 090), Saunek, Raja Ampat, West Papua, 00°27′58.9′S, 130°46′32.5′E, trap 40 m, coll. M. Mofu and E. Mamberaku, 9 August 2015.

Paratypes. 8 males (6.9, 7.0, 7.2 [dissected], 7.3, 7.3, 7.4, 7.4, 7.5 mm) ( MZB Cru.Iso 091), same data as holotype ; 4 males (6.5, 6.6, 6.7, 6.9 mm), 41 females (4.9–7.4, 5.9 [dissected], average 6.1 mm) ( MZB Cru.Iso 092), Saunek Monde, Raja Ampat, 00°27′04.9′S, 130°48′14.0′E, trap 40 m, coll. M. Mofu and E. Mamberaku, 11 August 2015 ; 3 males (5.9, 6.3, 6.4 mm) ( MTQ W34885), same data as previous ; 5 females (6.3, 6.4, 6.4, 6.6, 6.9 mm) ( MZB Cru.Iso 093), Saprok Bakdi, Raja Ampat, 00°26′36.2′S, 130°47′22.8′E, trap 10 m, coll. M. Mofu and E. Mamberaku, 12 August 2015 ; 3 females (5.7, 5.9, 6.0) ( MTQ W34887), same data as previous .

Description. Body ( Fig. 9A ) 3.1 times as long as greatest width, dorsal surfaces punctate, widest at pereonite 5, lateral margins subparallel. Rostral point absent. Eyes ( Fig. 9C ) separated by about 83% width of head, eye colour black. Pereonite 1 and coxae 2–3 ( Fig. 9B ) each with posteroventral angle rounded; coxae 5–7 with entire oblique carina; posterior margins of pereonite 7 with irregular submarginal nodules. Pleon ( Fig. 9F ) with pleonite 1 not visible in dorsal view; pleonites 2–5 posterior margin with regular small nodules; posterolateral angles of pleonite 2 forming acute point, extending posteriorly to anterior of pleonite 3; pleonite 3 with 1 median tubercle (the largest) and 10 sublateral tubercles on each side (set as two rows), posterolateral margins not extending to posterior margin of pleonite 5, acute; pleonite 4 with 1 median tubercle (the largest) and 10 sublateral tubercles on each side (set as two rows), posterolateral margin of pleonite 4 rounded, clearly extending beyond posterior margin of pleonite 5; pleonite 5 with 2 submedian and 2 sublateral tubercles on each side and posterolateral angles overlapped by lateral margins of pleonite 4. Pleotelson ( Fig. 10E ) 0.8 times as long as anterior width; with 2 submedian tubercle rows on dorsal surface (4 tubercles each) and a median row of small palmate setae; lateral margins straight, middle margins with wave-like nodules, posterior margin narrowly rounded, without median point, with 6 RS.

Antennula ( Fig. 9G ) peduncle articles 1 and 2 fused; articles 3 and 4 0.7 times as long as combined lengths of articles 1 and 2, article 3 1.8 times as long as wide; flagellum with 8 articles, extending to anterior of pereonite 1. Antenna ( Fig. 9D ) peduncle article 4 2.0 times as long as wide, 1.7 times as long as article 3, and 2 short simple setae and 1 palmate seta (distal); article 5 as long as article 4, 2.6 times as long as wide, anterodistal angle with cluster of 3 short simple and 2 palmate setae; flagellum with 19 articles, extending to posterior of pereonite 4.

Frontal lamina ( Fig. 9E ) pentagonal, 2.4 longer than greatest width, lateral margins anteriorly straight, diverging slightly towards anterior, anterior margin straight and acute, forming median point.

Mandible ( Fig. 10C ) molar process anterior margin with 21 flat teeth; with proximal cluster of long simple setae; right mandible spine row composed of 9 spines; palp article 2 with 13 distolateral setae, palp article 3 with 5 robust biserrate and 12 plumose setae. Maxillule ( Fig. 10B ) mesial lobe with 3 large and circumplumose RS; lateral lobe with 11 RS. Maxilla ( Fig. 10D ) lateral lobe with 5 long simple setae; middle lobe with 16 long simple setae; mesial lobe with 8 distal simple setae, with 4 proximal simple and plumose setae. Maxilliped ( Fig. 10A ) palp article 2 mesial margin with 5 slender setae, lateral margin distally with 1 slender seta; article 3 mesial margin with 11 slender setae, lateral margin with 8 slender setae; article 4 mesial margin with 10 slender setae, lateral margin with 4 slender setae; article 5 distal margin 11 setae, lateral margin with 3 setae; endite with 3 long CPS, and 2 coupling setae.

Pereopod 1 ( Fig. 11A ) basis 1.9 times as long as greatest width, superior distal angle without cluster of acute setae, inferior distal angle with cluster of 3 acute setae; ischium 0.6 times as long as basis, inferior margin with 2 setae, inferior distal margin with 1 RS, superior distal margin with 2 RS; merus inferior margin with 6 molariform RS, set as 2 and 4, with 2 simple setae, inferior distal margin without RS, superior distal angle with 2 RS; carpus inferior margin with 1 RS and 1 simple seta; propodus 1.9 times as long as wide, inferior margin with 2 RS, inferior distal margin with 1 large RS and 1 simple seta, superior distal with 2 simple setae; dactylus 0.8 as long as propodus. Pereopod 2 ( Fig. 11B ) ischium inferior margin with 1 long acute RS, inferior distal margin with 3 RS and 1 simple seta, superior distal margin with 1 long acute seta and 1 plumose seta; merus inferior margin with 4 stout RS and 1 RS, set as single row, inferior distal margin with 1 stout RS and 2 RS, superior distal margin with 1 long acute RS, 1 small RS and 1 plumose seta; carpus inferior distal margin with 2 RS and 1 acute RS; propodus 2.6 as long as wide, with 2 clusters of acute RS, inferior margin with 2 RS, inferior distal margin with 1 large RS and 2 simple setae; dactylus 0.8 as long as propodus. Pereopod 3 similar to pereopod 2. Pereopod 6 ( Fig. 11C ) similar to pereopod 7. Pereopod 7 ( Fig. 11D ) basis 1.9 times as long as greatest width, superior margin convex with 3 palmate setae, inferior margin convex; ischium 0.6 as long as basis, inferior margin with 7 RS (set in group of 3 and 4), inferior distal angle with 2 acute and 2 blunt RS, superior distal angle with 4 RS (1 biserrate); merus 0.8 as long as ischium, 1.9 times as long as wide, inferior margin with 3 RS, superior distal angle with 9 RS (2 biserrate), inferior distal angle with 7 RS (1 blunt); carpus 0.8 as long as ischium, 2.4 times as long as wide, inferior margin with 2 RS, superior distal angle with 16 biserrate RS, inferior distal angle with 8 RS (2 biserrate); propodus 1.1 as long as ischium, 4.2 times as long as wide, inferior margin with 2 clusters of RS (set as 1 and 2), superior distal angle with 2 slender setae, 1 plumose seta and 2 RS, inferior distal angle with 2 RS; dactylus 0.5 as long as propodus.

Penes ( Fig. 10G ) opening flush, penial openings separated by 11% of sternal width.

Pleopod 1 ( Fig. 12A ) exopod 1.4 times as long as wide, lateral margin straight, distally broadly rounded, mesial margin strongly convex, with PMS from distal one-third, with ~33 PMS; endopod 2.1 times as long as wide, distally narrowly rounded, lateral margin proximally concave, with PMS from distal one-third, mesial margin with PMS on distal margin only, endopod with ~17 PMS; peduncle 1.7 times as wide as long. Pleopod 2 ( Fig. 12B ) exopod with ~45 PMS, endopod with ~19 PMS; appendix masculina with parallel margins, as long as endopod, distally acute. Pleopod 3 ( Fig. 12C ) exopod with ~51 PMS, endopod with ~14 PMS. Pleopod 4 ( Fig. 12D ) exopod with ~52 PMS, endopod with ~12 PMS. Pleopod 5 ( Fig. 12E ) exopod with ~50 PMS. Pleopods 2–5 peduncle distolateral margin with prominent acute RS, 3–5 endopods with distomesial serrate scales.

Uropod ( Fig. 9H–9I ) peduncle ventrolateral margin without RS, lateral margin with medial short acute RS, posterior lobe about 1.1 as long as endopod; rami extending beyond pleotelson, marginal setae in single tier, apices not bifid with lateral process. Endopod apically rounded in male and not bifid in female with lateral process; lateral margin distally straight, proximal lateral margin without RS; distal lateral margin with 1 RS, mesial margin convex, with 7 RS. Exopod extending beyond end of endopod, 1.1 (0.8 in female) times as long as endopod, 3.2 (2.6 in female) times as long as greatest width, apically subtruncate (in male) and not bifid (in female) with lateral process; lateral margin straight, proximally convex, with 3 visible widely separated RS, distal with setal fringe; mesial margin straight, with 2 RS.

Female. Female differs in lacking a median row of small setae on the pleotelson ( Fig. 10F ). The uropodal exopod is shorter than the male (0.8 vs. 1.1 LW) and narrower (2.6 vs. 3.2 LW) with a narrower apex and lacks the setal mass on the posterior lateral margin.

Size. Males 5.9–7.5 mm, mean 6.9 mm (n=16); non-ovigerous females 4.9–7.4 mm, mean 6.2 mm (n=49); all from type series.

Variation. RS count was measured from 9 specimens of type series. Uropod exopod lateral: 3 = 77.8%, 4 = 22.2%; mesial: 2 = 22.2%, 3 = 77.8%. Uropod endopod lateral: 1 = 11.1%, 2 = 88.9%; mesial: 6 = 22.2%, 7 = 77.8%. Pleotelson: 6 = 100%.

Remarks. Cirolana fasfes , new species, is characterised by the presence of small irregular submarginal nodules on posterior margins of pereonites 7 only; pleonites 3 and 4 with 1 large median tubercle and sublateral tubercles; and 4 submedial tubercles and wave-shaped nodules on lateral margins of the pleotelson. The wave-like series of nodules on lateral margin of pleotelson are not easy to observe, needing critical lighting to be seen clearly at a magnification of 20 times or higher. Cirolana curtensis Bruce, 1986 shows similar marginal nodules on the pleotelson but is proportionally more slender (0.7 vs. 0.8 LW), has only two small submedial tubercles on the pleotelson (vs. two rows with four prominent tubercles each), has truncate pleotelson (vs. narrowly rounded), has more close set penial openings (7% vs. 11% in C. fasfes ), and lacks of setal fringe on posterior of the uropodal exopod.

Distribution. Raja Ampat, West Papua, Indonesia; 10 to 40 metres.

Etymology. Fasfes is the Biak language for curly, alluded to the wavy shape of the nodules on the lateral margin of pleotelson; noun in apposition.

Figures

Fig. 9. Cirolana fasfes n. sp. A–C, E–F, holotype male (7.4 mm) (MZB Cru.Iso 090), Raja Ampat, Indonesia. D, G, H, paratype male (7.2 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. I, paratype female (5.9 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. A, dorsal view; B, lateral view; C, head; D, antenna peduncle; E, frons; F, pleon; G, antennule; H, uropod male; I, uropod female.

Fig. 10. Cirolana fasfes n. sp. A–E, G, paratype male (7.2 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. F, paratype female (5.9 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. A, maxilliped; B, maxillule; C, right mandible; D, maxilla; E, pleotelson male; F, pleotelson female; G, penial openings.

Fig. 11. Cirolana fasfes n. sp. A–D, paratype male (7.2 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. A, pereopod 1; B, pereopod 2; C, pereopod 6; D, pereopod 7.

Fig. 12. Cirolana fasfes n. sp. A–E, paratype male (7.2 mm) (MZB Cru.Iso 091), Raja Ampat, Indonesia. A, pleopod 1; B, pleopod 2; C, pleopod 3; D, pleopod 4; E, pleopod 5.