Periclimenes brevicarpalis ( Schenkel, 1902 )

Prakash, Sanjeevi, Kumar, Thipramalai Thangappan Ajith & Subramoniam, Thanumalaya, 2015, Notes on some Indo-Pacific Caridean shrimps (Crustacea: Decapoda: Caridea: Palaemonidae and Gnathophyllidae) particularly from India, Zootaxa 3914 (4), pp. 456-466 : 461

Periclimenes brevicarpalis ( Schenkel, 1902)

( Figure 3 B)

Restricted synonymy:

Ancylocaris brevicarpalis Schenkel, 1902: 563 ; Plate 13, figs 21a–m.

Periclimenes (Ancylocaris) brevicarpalis Kemp, 1922: 185 , Figs. 40–42, pl. 6: Fig. 8

Periclimenes (Harpilius) brevicarpalis Holthuis, 1952: 10 , 69–73, fig. 27.

Periclimenes brevicarpalis Bruce, 1973: 133 –134, fig. la, b. Bruce, 1974b: 439 –440. Bruce, 1983: 879, Fig. 7D, E. Chace and Bruce, 1993: 104. Unmesh and Prakash, 2011, 17: 34, figs. 3–5.

Material examined. 8 males and 6 female (3 ovigerous) (tl 2.6–3.4 cm, cl 5.5–7 mm), Agatti Island, Lakshadweep, depth 3 m, on Heteractis magnifica and Entacmaea quadricolor , (10o50’44.06”N 72o11’08.91”E), lagoon area, coll. S. Prakash and M. Gopi, 10th March 2011, ( MBRC /ZSI M1-52)

4 individuals (2 ovigerous females and 2 males) (tl 3.0– 3.5 cm, cl 6.0– 6.5 mm), near Van Island, Gulf of Mannar, depth 4–5 m, on Stichodactyla haddoni (8o50’06.92”N 78o12’48.75”E), coll. T. T. Ajith Kumar, 12th May 2013.

Diagnoses based on the collected material. Specimens have five dorsal and one ventral tooth and the single male has six dorsal and one ventral tooth. The endopod of the male first pleopod is 2.3 times longer than broad and slightly expanded distally. The borders of the distal two thirds bear sixteen plumose setae, of which the distal are shorter than the proximal. Six simple submarginal setae are present along the distal third of the medial border. Ten short, curved, subequal, simple setae are present along two thirds of the medial border proximal to the plumose setae. The endopod of the male second pleopod bears a slender appendix, which slightly exceeds the appendix interna, and bears a single simple seta terminally with eight similar setae, of decreasing length proximally, along its lateral border. Telson and uropods have five orange spots bordered with black ring.

Host. Associated with sea anemones like Heteractis magnifica and Entacmaea quadricolor from the lagoon area, Agatti Island, Lakshadweep at a depth of 2– 3 m. Gulf of Mannar specimens were collected from the sea anemone Stichodactyla haddoni at a depth of 3– 4m.

Distribution. Red Sea, Djibouti, Kenya, Zanzibar, Tanzania, Mozambique, Madagascar, Seychelles, Mauritius, Persian Gulf, Maldives, south India, Andaman Islands, Malaya, Singapore, Vietnam, South China Sea, Ryukyu Islands, Japan, Philippines, Indonesia, Papua New Guinea, Australia, Caroline Islands, Solomon Islands, New Caledonia, Loyalty Islands, and Marshall Islands. In India it has been reported from Andaman & Nicobar Islands ( Tikader et al., 1986), Gulf of Mannar ( Kemp 1922; Ramesh et al., 2008; Radhakrishnan et al., 2012), Gulf of Kuchchh ( Unmesh and Prakash, 2011). Currently known from Agatti Island, Lakshadweep.

Remarks. The specimens agree well with the previous descriptions and considered as well known commensal of giant sea anemones. It also clips and feeds on the tentacle of its host anemone without any evident benefit for the host ( Fautin et al., 1995).

Figures

FIGURE 3. A, Ancylomenes magnificus Bruce, ovigerous female (dorsal view) from Gulf of Mannar; B, A pair of Periclimenes brevicarpalis Schenkel (dorsal view) with a host anemone Heteractis magnifica from Lakshadweep; C, P. s o ror Nobili, ovigerous female (dorsal view) on the ventral side of cushion sea star Culcita sp. from Lakshadweep; D. same (dorsal view).