Parabopyrella symmetros, 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 : 59-61

Parabopyrella symmetros , n. sp. Figure 18

Parabopyrella mortenseni: An, 2006: 84–85 , fig. 39 (not Parabopyrella mortenseni Nierstrasz and Brender à Brandis, 1929)).

MATERIAL EXAMINED: Infesting Alpheus microstylus ( Bate, 1888) , holotype ♀ ( CIEAL 800505), allotype ♂ ( CIEAL 800506), Xisha, Shanhu Islands, 111 ° 40′E, 16 ° 45′N, 9–12 May 1980. Paratypes: 3 ♀♀ ( CIEAL 800507), 3 ♂♂ ( CIEAL 800508), same data as for holotype.

DESCRIPTION: Holotype female (CIEAL 800505): Length 5.92 mm, maximal width 3.81 mm, head length 1.48 mm, head width 1.55 mm, almost symmetrical (fig. 18A, B). Head an inverted trapezoid, lateral margins distinct, posterior margin fused with first pereomere; black eyes near anterolateral corners (fig. 18A). Antennule of three articles, terminally setose, visible in dorsal view, basal article stout. Antenna of two articles, terminally setose. Maxilliped (fig. 18C) with stout palp, terminally truncate, setose. Barbula (fig. 18D) with two pairs of falcate lateral projections on each side, medially flattened.

Pereon broadest across third pereomere (fig. 18A). Coxal plates and dorsolateral bosses on first four pereomeres. Brood pouch completely open (fig. 18B), oostegite 1 and barbula visible in ventral view. Oostegite 1 (fig. 18E, F) with two articles, anterior margin of first article concave, internal ridge bearing two or three small projections, posterolateral point directed laterally. Pereopods of similar size (fig. 18G), with slender bases and small dactyli. Pleon of six pleomeres, first pleomere distinct, second to fourth pleomeres on right side distinct, but those on left side obscure and only indicated by lateral indentations. Fifth and sixth pleomeres fused and indicated by lateral notches. Pleotelson fan shaped, terminal margin entire. First five pleomeres with flaplike biramous pleopods; uropods absent.

DESCRIPTION: Allotype male (CIEAL800 506): Length 1.95 mm, maximal width across pereomere 3 0.70 mm, head width 0.38 mm, head length 0.17 mm, pleonal length 0.39 mm (fig. 18H, I). Head elliptical, fused with first pereomere, but with lateral notch between head and pereon (fig. 18H); black eyes mediolaterally (fig. 18H). Antennule of two articles, antenna of three articles, lacking terminal setae (fig. 18I). Pereomeres subequal in width, lacking midventral projections (fig. 18I). Pereopods of similar size, but first two with slightly larger dactyli, last four pereopods with longer carpi than first three (fig. 18I). Pleon with first three segments distinct, last three segments fused but indicated by weak lateral indentations. First three pleomeres with midventral tubercles. Pleopods and uropods lacking (fig. 18I).

ETYMOLOGY: The specific name symmetros is feminine and refers to the female having an almost symmetrical body shape.

HOSTS AND LOCALITY: Infesting Alpheus microstylus ( Bate, 1888) (Alpheidae) , Xisha (Paracel Islands), China.

REMARKS: Parabopyrella symmetros , n. sp., belongs to the “A” group with the female pleotelson posterior margin entire, not incised or indented. The new species can be distinguished from the other five species of “A” group by the symmetrical female having the first, second, and third pleomeres on the right side distinct, and the male with the first three pleomeres distinct. This species is most closely related to P. perplexa , but P. perplexa females have an asymmetrical body, lack eyes, have the posterolateral point of oostegite 1 acute, and the palp of the maxilliped triangular. Alpheus microstylus is also known to be infested by Bopyrione toloensis Markham, 1982 .

KEY TO THE 28 SPECIES OF PARABOPYRELLA MARKHAM, 1985 , BASED ON MALE AND FEMALE CHARACTERS

1a. Posterior edge of female pleotelson entire.. 2

1b. Posterior edge of female pleotelson not entire........................... 15

2a. Posterior edge of female pleotelson truncate or very weakly convex........... 3

2b. Posterior edge of female pleotelson strongly convex.................... 4

3a. Body symmetrical.... P. symmetros , n. sp.

3b. Body asymmetrical............................ P. perplexa Markham, 1990

4a. Posterior edge of female pleotelson rounded.. 8

4b. Posterior edge of female pleotelson not rounded......................... 5

5a. Anterior margin of female head crenulated

............. P. crenulata ( Shiino, 1939) 5b. Anterior margin of female head smooth.. 6 6a. Dorsolateral bosses reduced on both sides

of female pereon............. P. choprai

(Nierstrasz and Brender à Brandis, 1929) 6b. Dorsolateral bosses on at least one side of female’ s first four pereomeres......... 7 7a. Distal margin of female pleotelson acute

........... P. delagoae ( Bourdon, 1982) 7b. Distal margin of female pleotelson blunt

.......... P. angulosa ( Bourdon, 1980a) 8a. Coxal plates and dorsolateral bosses of female absent... P. setoensis ( Shiino, 1939) 8b. Coxal plates and dorsolateral bosses of female present.................... 9 9a. Lateral margin of pleon of male deeply indented......................... 10 9b. Lateral margin of pleon of male slightly indented......................... 12 10a. Median of female pleon fused, segments obscure......... P. angusta (Shiino, 1963) 10b. Median of female pleon not fused, only last two pleomeres fused................ 11 11a. Male with five pairs of pleopods........

........... P. nierstraszi ( Chopra, 1930) 11b. Male with four pairs of pleopods.......

........... P. tanyensis (Bourdon, 1979) 12a. Female barbula with one pair of lateral projections................. P. saronae

( Bourdon and Bruce, 1979) 12b. Female barbula with two pairs of lateral projections....................... 13 13a. First oostegite with long posterior portion

... P. essingtoni ( Bourdon and Bruce 1983) 13b. Oostegite 1 with short posterior portion.. 14 14a. Pleon of male much broader than pereon

......... P. richardsonae (Nierstrasz and

Brender à Brandis, 1929) 14b. Pereon of male equal to or broader than pleon...... P. mortenseni (Nierstrasz and

Brender à Brandis, 1929) 15a. Distal edge of female pleon deeply separated........................ 16 15b. Distal edge of female pleon slightly indented......................... 17 16a. Pereon of female much wider than pleon........... P. lata (Nierstrasz and

Brender à Brandis, 1929) 16b. Pereon of female equal to or slightly wider than than pleon.......... P. megatelson

(Nierstrasz and Brender à Brandis, 1929)

17a. Divergent pleotelson of female terminally rounded......................... 18

17b. Divergent pleotelson of female not terminally rounded...................... 20

18a. Male with slender pleon, all segments fused, without lateral indentations...... P. thomasi (Nierstrasz and Brender à Brandis, 1929)

18b. Male with broad pleon, lateral indentations indicating segments............. 19

19a. Barbula of female with one pair of lateral projections.... P. intermedia (Nierstrasz and Brender à Brandis, 1923)

19b. Barbula of female with two pairs of lateral projections.... P. distincta (Nierstrasz and Brender à Brandis, 1923)

20a. Pleotelson of female divergent and terminally quadrate..................... 21

20b. Pleotelson of female slightly divergent, terminus with two points............... 25

21a. Male with uropods............................... P. pacifica ( Shiino, 1933)

21b. Male without uropods............... 22

22a. Male pleomeres not completely fused... 23

22b. Male pleon fused, segments indicated only by lateral indentations............... 24

23a. Male pleon segments indicated by dorsal obscure sutures and deep lateral indentations......... P. barnardi (Nierstrasz and Brender à Brandis, 1931)

23b. Male pleon segments without any fusion, distinct............. P. cuspidata , n. sp.

24a. Female with eyes................................ P. elongata (Shiino, 1949)

24b. Female without eyes........................ P. australiensis ( Bourdon, 1980a)

25a. Pleomeres of male fused, with very weak lateral indentations................. 26

25b. Pleomeres of male fused only medially... 27

26a. Male first two pleomeres with midventral tubercles...... P. bonnieri (Nierstrasz and Brender à Brandis, 1923)

26b. Male first pleomere only with midventral tubercle........ P. incisa ( Chopra, 1923)

27a. Male first two pleomeres much wider than pleon........ P. hodgarti ( Chopra, 1923)

27b. Male first pleomere only wider than pleon....... P. indica ( Chopra, 1923)

Figures

Fig. 18. Parabopyrella symmetros n. sp., holotype female (CIEAL800505) (A–G): A. Dorsal view. B. Ventral view. C. Right maxilliped, external view. D. Right side of barbula. E. Right oostegite 1, external view. F. Right oostegite 1, internal view. G. Right pereopod 7. Allotype male (CIEAL800506) (H, I): H. Dorsal view. I. Ventral view. Scale: 2 mm (A, B); 1 mm (C, D); 1.5 mm (E, F); 0.55 mm (G); 0.5 mm (H, I).