Paranikione sibogae, An & Boyko & Li, 2015

An, Jianmei, Boyko, Christopher B. & Li, Xinzheng, 2015, A Review Of Bopyrids (Crustacea: Isopoda: Bopyridae) Parasitic On Caridean Shrimps (Crustacea: Decapoda: Caridea) From China, Bulletin of the American Museum of Natural History 2015 (399), pp. 1-85 : 23-25

Paranikione sibogae , n. sp.

Figure 4

Urobopyrus processae: An, 2006: 69–70 , fig. 29 (not Urobopyrus processae Richardson, 1904 ).

MATERIAL EXAMINED: Infesting Nikoides sibogae de Man, 1918 . Holotype ♀ ( CIEPR 615401) and allotype ♂ ( CIEPR 615402), South China Sea, Stn. 6154, 110 ° 45′E, 19 ° 15′N, 38 m, 10 July 1959, coll. Fengshan Xu. Paratypes: 1 ♀, 1 ♂ ( CIEPR 603001), South China Sea, Stn. 6030, 115 ° 30′E, 21 ° 30′N, 115 m, 13 April 1960, coll. Jingzuo Qu.

OTHER MATERIAL: 1 ♀, 2 ♂♂ ( CIEPR 607701 ), South China Sea, Stn. 6077, 113 ° 00′E, 21 ° 00′N, 54 m, 21 April 1959, coll. Fuzeng Sun ; 1 ♀, 1 ♂ ( CIEPR615901 ), South China Sea, Stn. 6159, 110 ° 30′E, 18 ° 45′N, 31 m, 6 May 1960, coll. Shoupeng Shen.

DESCRIPTION: Holotype female (CIEPR 615401): Length 4.39 mm, maximal width 4.54 mm, head length 0.69 mm, head width 1.32 mm, sinistral body shape, distorted 23 ° (fig. 4A, B). Body wider than long, left side longer than right, all segments distinct. Head elliptical with bilobate anterior margin, well-developed frontal lamina extending beyond head. Eyes absent (fig. 4A). Antennule of three articles, antenna of five articles, setae not observed. Maxilliped rec‐ tangular, with stout and short palp bearing three stout setae distally (fig. 4D). Barbula with two pairs of smooth falcate lateral projections on each side, median pair of small trianglular projections near center (fig. 4D).

Pereon broadest across third pereomere. First four pereomeres with dorsolateral bosses, all pereomeres with coxal plates. Coxal plates of left side larger than right (fig. 4A). Brood pouch widely open (fig. 4B). Oostegite 1 (fig. 4E, F) with smooth internal ridge, posterolateral point round, laterally directed, mesiolateral margin setose. Posterior pereopods larger than anterior pairs, carpi and meri smooth, bases of all pereopods produced into smooth lobes. Pleon of six pleomeres, lateral plates well developed. First five pleomeres with biramous pleopods and lateral plates, sixth pleomeres with biramous uropods. Surface of pleopods and uropods tubercular (fig. 4B).

DESCRIPTION: Allotype male (CIEPR 615402): Length 1.50 mm, maximal width across pleomere 4 0.44 mm, head width 0.28 mm, head length 0.16 mm. All pereomeres distinctly segmented (fig. 4G, H). Head semicircular (fig. 4G), dark eyes medially (fig. 4G). Antennule of three articles, with setae on distal article, antenna of five articles, terminally setose (fig. 4H). All pereomeres subequal in width, midventral projections lacking (fig. 4H). First two pereopods each with slightly larger dactylus and longer ischium (fig. 4I, J) than other pereopods. Pleon of six segments, midventral projections lacking, five pleomeres with small tubercular pleopods. Sixth pleomere (pleotelson) with medial anal cone and pair of distolateral uropods with setose terminal margins (fig. 4H).

VARIATION: The paratype female agrees with the holotype in most characters, but is weakly tubercular on the surface of the head and sinistral at 39 °. Two immature males (CIEPR607701) are attached to the pleomere of this female. Another female (CIEPR615901) has a white body, as opposed to the typical preserved tan coloration, but this may be an artifact of preservation.

ETYMOLOGY: The specific name, sibogae , refers to the host name and honors the Dutch Siboga Expedition to Indonesia (March 1899 – February 1900) on which bopyrid researcher Hugo Frederik Nierstrasz (1872–1937) served as zoologist. The species is feminine because ships names are considered female.

HOST AND LOCALITY: Infesting Nikoides sibogae de Man, 1918 (Processidae) , South China Sea, 38– 54 m.

REMARKS: See the generic diagnosis for discussion of the differences between this species and those in Nikione and Urobopyrus and Remarks under Paranikione distorta , n. sp., for the differences between the two species in the new genus.

Figures

Fig. 4. Paranikione sibogae n. gen., n. sp., holotype female (CIEPR615401) (A–F): A. Dorsal view. B. Ventral view. C. Left maxilliped, external view. D. Right side of barbula. E. Right oostegite 1, external view. F. Right oostegite 1, internal view. Allotype male (CIEPR615402) (G–J): G. Dorsal view. H. Ventral view. I. Pereopod 1. J. Pereopod 7. Scale: 1 mm (A, B); 0.5 mm (C–F); 0.25 mm (G–J).