Platylicoa angela Bamber, 2013

Kong, Chim Chee, 2024, A synopsis of the Tanaidacea (Crustacea: Peracarida) of Singapore, with a review of tanaidacean diversity in Southeast Asia and the South China Sea, Zootaxa 5451 (1), pp. 1-75 : 27-28

Platylicoa angela Bamber, 2013

( Fig. 13 )

Platylicoa angela Bamber, 2013b: 425–432 , figs. 13–16.

Material examined. Station SG 6: 1 ovigerous female and 1 female with oostegites ( ZRC.1992.6636-6642). Station SG13: 1 damaged specimen (002). Station SG14: 7 damaged and incomplete specimens (133). Station SG15: 1 damaged specimen (129). Station SG16: 3 damaged specimens (041); 10 damaged and incomplete specimens (220). Station SG 22: 1 incomplete and damaged specimen (CR0511-P02-01-01), 9 May 2011 ; 1 incomplete and damaged specimen (CR0512-P02-01-02), 23 May 2012; 1 incomplete male (CR0514-P02-03-05), 7 May 2014; 1 incomplete specimen (CR1114-P02-03-01), 11 November 2014; 1 incomplete specimen (CR0515-P02-03), 11 May 2015; 1 incomplete specimen (CR1016-P02-02-01), 5 October 2016; 2 incomplete specimens (CR1117-P02- 01-03, CR1117-P02-02-03), 8 November 2017; 1 incomplete specimen (CR1118-P02-01-02), 14 November 2018; 1 incomplete specimen (CR0619-P02-03), 13 June 2019; 1 damaged specimen (CR1219-P02-01-02), 4 December 2019; 1 incomplete specimen (CR0820-P02-01), 5 August 2020. Station SG23: 1 incomplete female with oostegites (CR0513-P06-02), 9 May 2013; 1 incomplete female with oostegites (CR1113-P06-01), 1 specimen (CR1113- P06-02), 1 incomplete specimen (CR1113-P06-03-01) and 1 incomplete specimen (CR1113-P06-03-02), 13 November 2013; 1 incomplete male (CR0514-P06-01-01), 8 May 2014; 2 incomplete males (CR1115-P06-01-01) and 2 specimens (CR1115-P06-01-02), 3 November 2015; 1 specimen (CR1117-P06-02-01), 9 November 2017 ; 1 incomplete female with oostegites (CR0518-P06-02), 10 May 2018; 1 incomplete specimen (CR1219-P06-02), 6 December 2019. Station SG24: 1 incomplete ovigerous female (CR1115-P07-02), 3 November 2015. Station SG25: 2 damaged specimens (CR0609-P08-01), 8 June 2009. Station SG36: 1 adult male (JS-7365) .

Remarks. Guţu (2006) erected Platylicoa and assigned Pakistanapseudes pectinis Bamber, 1999 from Brunei as the type species of the new genus. The genus name refers to the great width of the pleonites (Guţu 2006). Other diagnostic features of this taxon include (1) the short pleon; and (2) the presence of plumose setae on both dorsal and ventral margins of pereopod-6 basis (Guţu 2006). A revised diagnosis of the genus is available in Guţu (2008). Bamber (2013b) later questioned the validity of this genus, as he observed that the dorsal row of setae on pleonite- 1 displays interspecific variation within the genus, while the setation of pereopod-6 shows intraspecific variation in the genus. He also transferred Platylicoa from another subfamily, Parapseudinae , to Pakistanapseudinae . This genus is currently represented by three species ( Anderson 2023), namely P. pectinis , P. setosa Gutu, 2006 and P. angela Bamber, 2013b , all of which were recorded from shallow (6.5–180 m depth) sandy habitats in Borneo and Queensland, Australia (Bamber 1998 (1999), 2013b; Bamber & Sheader 2005; Guţu 2006).

Most of the individuals in the present material are incomplete, reflecting the fragility of the specimens as also observed by Bamber (2013b). Nonetheless, these specimens from Singapore can be readily identified as P. angela based on the distinctive posterolateral ventral curved spiniform setae on each of pereonites 2 and 3 ( Fig. 13 ). The body length of the current material, excluding the rostrum, reaches a maximum of 8.8 mm, which is similar to the length of the P. angela holotype at 10.5 mm including the rostrum. However, the P. angela specimens from Singapore differ from that described in Bamber (2013b) by the presence of a large and curved spiniform seta on pereopod-1 merus dorsodistally. Bamber (2013b) also observed intraspecific variation in the number of setae and spines on the ventral margin of pereopod-1 propodus of this species. Platylicoa angela was previously recorded only from its type locality in Brunei at 6.5–90 m depth ( Bamber 2013b). The Singaporean specimens were collected from the Singapore Strait and the outer East Johor Strait (i.e., Pulau Tekong, Pulau Ubin and Punggol) at 5–54 m depth.

Figures

FIGURE 13. Platylicoa angela Bamber, 2013, non-ovigerous female with detached pereopods, CR0513- P06-02, Singapore, dorsal habitus, with inset showing posterolateral curved spiniform setae (arrows) on pereonites 2 and 3. Scale bar = 2 mm.