Calozodion sp.

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 : 20

Calozodion sp. SG#1

( Figs. 7A–C )

Material examined. Station SG23: 1 incomplete specimen (CR0112-P06-03-01), 20 January 2011; 9 damaged specimens (CR0512-P06-01-02) and 1 specimen (CR0512-P06-03), 25 May 2012; 1 specimen (CR1114-P06-01-02), 12 November 2014 ; 2 specimens (CR1115-P06-01-03), 3 November 2015; 3 specimens (CR1117-P06-01, CR1117- P06-02-02, CR1117-P06-03-02), 9 November 2017; 2 specimens (CR0518-P06-01), 10 May 2018; 1 damaged specimen (CR1118-P06-01), 15 November 2018; 3 specimens (CR0820-P06-03-01), 6 August 2020. Station SG24: 1 specimen (CR0605-P07-02), 23 June 2005; 2 damaged specimens (CR1209-P07-03), 3 December 2009; 1 specimen (CR0710-P07-01), 20 July 2010; 2 specimens (CR0512-P07-02), 25 May 2012; 4 damaged specimens (CR1112- P07-01), 1 damaged specimen (CR1112-P07-02) and 1 damaged specimen (CR1112-P07-03), 6 November 2012; 1 specimen (CR1113-P07-03), 13 November 2013; 2 ovigerous females (CR0514-P07-02), 8 May 2014; 2 damaged specimens (CR1219-P07-02), 6 December 2019. Station SG26: 2 specimens (CR0512-PS06-02), 28 May 2012; 6 damaged specimens (CR1113-PS06-01-02), 5 specimens (CR1113-PS06-02) and 1 specimen (CR1113-PS06-03), 11 November 2013; 106 specimens (CR0514-PS06-01-02), 21 specimens including 2 ovigerous females (CR0514- PS06-02-02) and 2 specimens (CR0514-PS06-03-02), 5 May 2014; 1 ovigerous female and 1 male (CR1114-PS06- 03-03), 13 November 2014; 1 specimen (CR0515-PS06-01), 14 May 2015 ; 4 ovigerous females (CR1115-PS06-01) and 1 specimen (CR1115-PS06-03-01), 5 November 2015; 3 specimens (CR0516-PS06-03-01), 12 May 2016 ; 1 ovigerous female and 1 incomplete specimen (CR1117-PS06-02-04), 6 November 2017; 2 damaged specimens (CR0619-PS06-03), 14 June 2019; 2 damaged specimens (CR1219-PS06-01-02), 2 December 2019. Station SG 44: 8 specimens (SS-0134). Station SG 49: 1 specimen (SEA-2321). Station SG62: 1 male (SEA-7676). Station SG72: 1 specimen (SUB-2034) .

Remarks. Gardiner (1973) described the genus Calozodion and designated C. wadei Gardiner, 1973 from Jamaica as the type species. The diagnosis of the genus was later revised by Guţu (1996, 2002), and characters that define this taxon include (1) the antennule inner flagellum formed by only two articles; (2) the labium terminal lobe bearing apical spine that is usually long; and (3) the chelipd with a very short carpus, a very large propodus bearing two proximal spines on the ventral margin, and a very thick and short fixed finger. The genus is currently represented by 12 species ( Anderson 2023), of which 10 were described from the Atlantic Ocean, including the Mediterranean Sea ( Gardiner 1973; Guţu 1984, 1996, 2002, 2006, 2014; Bochert 2012; Menioui 2013; Jakiel et al. 2015). The two Indo-West Pacific species, C. suluk Bamber & Sheader, 2005 and C. tanzaniense Guţu, 2014 , were described from Malaysia and Tanzania, respectively. All seven species with available depth data were recorded from shallow waters (6–117 m depth), with the exception of C. pabisi Jakiel & Jóźwiak, 2015 (in Jakiel et al. 2015), which was collected from 386 m in the Gulf of Guinea. The characters used for identification keys to Calozodion species were mostly located on the antennule, mandibles, cheliped, pereopods, and uropod endopod ( Guţu 1996, 1998c, 2014; Menioui 2013). The present material clearly belongs to Calozodion but cannot be identified to known species based on these keys. Calozodion sp. SG#1 is also different from the recently described species C. bogoescui Guţu, 2014 , C. tanzaniense Guţu, 2014 and C. pabisi . This potentially undescribed species was collected from sandy and rocky bottoms in the Singapore Strait at 14–91 m depth.

Figures

FIGURE 7. Calozodion sp. SG#1, SS-0134, Singapore: (A, B) non-ovigerous female, dorsal and lateral habitus, respectively; (C) adult male, lateral habitus. Scale bar = 1 mm.