Upogebia ancylodactyla de Man, 1905

Dworschak, Peter C. & Anker, Arthur, 2022, Axiidea (Crustacea: Callianassidae, Callichiridae and Ctenochelidae) and Gebiidea (Upogebiidae) collected during the Comprehensive Marine Biodiversity Survey of Singapore, Raffles Bulletin of Zoology 70, pp. 108-133 : 121-123

Upogebia ancylodactyla de Man, 1905

( Figs. 2g, h , 10)

Upogebia (Gebiopsis) ancylodactyla de Man, 1905: 599–600 .

Upogebia (Calliadne) ancylodactyla . — de Man, 1928: 24 (list), 87 (part.), pl. 9 fig. 13–13f [not pl. 9, fig. 13g, h, pl. 10, fig. 13i–j = Upogebia baweana Tirmizi & Kazmi, 1979 ].

Upogebia ancylodactyla . — Tirmizi & Kazmi, 1979: 106, fig. 1; — Sakai, 1993: 90; — Sakai, 2006: 91; — Ngoc-Ho, 2008: 143, fig. 7.

Upogebia (Upogebia) ancylodactyla . — Sakai, 1982: 27, figs. 3e, 5c; — Sakai, 1984a: 160.

[ Upogebia darwini . — Ngoc-Ho, 1977: 439 (part), figs. 1–3b [not fig. 3c–i, = U. darwinii ( Miers, 1884) ; not fig. 4f–i, = U. barbata ( Strahl, 1862) ].

CMBS material. 1 ov. female (17/5.3), 1 male (17/5.1) ( ZRC 2018.0547 ), sta. DR174, Straits of Singapore near Kusu Island, 1°12.202′N 103°52.178′E, reddish marine clay, gravel, shells, rectangular dredge, 79.6–135 m, coll. B Richer de Forges et al., 5 June 2013; 1 ov. female (23/6.4), 1 male (22/6.6) ( NHMW 26052 ), sta. IT103, Terumbu Pempang Tengah, 01°13.758′N 103°43.736′E, intertidal, coll . CS Tan, D Uyeno et al., 30 May 2013 (SS-3231); 1 male (15/4.9) ( NHMW 26049 ), 1 ov. female (29/8.3) ( NHMW 26050 ), 1 ov. female (25/7.7) ( ZRC 2018.0530 ), 1 male (26/6.9) ( ZRC 2018.0531 ), 1 male (27/8.0) ( ZRC 2018.0532 ), 1 ov. female (24/6.9) ( ZRC 2018.0533 ), 1 ov. female (18/5.1), 1 male (16/5.1) 1 exuvia (17/5.3) ( NHMW 26054 ), sta. IT120, Pulau Hantu, intertidal, coll. KS Koh, TS Ahyong, K Tilbrook et al., 31 May 2013 (SS-2946, SS-2949); 1 male (26/7.7) ( ZRC 2018.0528 ), sta. IT122, Terumbu Raya , intertidal, coll . CS Tan et al., 31 May 2013 (SS-2948); 1 male (20/6.0) ( ZRC 2018.0556 ), sta. IT124, Terumbu Pempang Laut, 01°13.912′N 103°43.402′E, intertidal, coll. YL Lee, I Kwan et al., 31 May 2013 (SS-3981); 1 ov. female (16/5.1), 2 males (24/7.1, 18/5.1), 1 female (16/5.0) ( NHMW 26053 ), sta. IT140, Tekukor, 1°13.899′N 103°50.265′E, intertidal, coll. YL Lee, SK Tan et al., 1 June 2013 (SS-4012); 1 male (16/4.9) ( ZRC 2018.0555 ), sta. SB146, west of Pulau Hantu , coral rubble brushing, 5–7 m, coll. HH Tan, S De Grave et al., 2 June 2013 (SS-2979); 1 male (29/8.4) ( ZRC 2018.0549 ), 1 female (40/11.3) ( ZRC 2018.0551 ), sta. SD056, southern Pulau Jong, 1°12.55′N 103°47.2′E, silty rubble, hand collection by scuba diving 17 m, coll. C Messing, S De Grave, HH Tan et al., 25 May 2013 (SS-1623, SS-1624); 1 male (11/3.5) ( ZRC 2018.0543 ), sta. SW024, Pulau Sekudu, 1°24.263′N 103°59.241′E, sand, mud, rocks, hand and yabby pump, 0 m, coll . R Tan, M Ng et al., 18 October 2012; 1 ov. female (27/7.7), 1 male (27/8.1) ( NHMW 26051 ), sta. SW026, Tuas , West Drive 60, 1°19′45.9″N 103°37′50.9″E, intertidal, sand-mud, some corals, hand collection and beach seine, 0–0.5 m, coll. HH Ng, H Wong et al., 18 October 2012 (JS-1152); 1 ov. female (16/4.4) ( ZRC 2018.0554 ), sta. TB172, Straits of Singapore near Kusu Island, 1°12.180′E 103°52.125′E, consolidated marine clay, 94.5–100 m, coll. B Richer de Forges et al., 5 June 2013 (SS-4522) .

Diagnosis. Lateral ridges of gastric region not projecting forward. Linea thalassinica not reaching end of carapace. Rostrum longer than eyestalks, with 4 frontal teeth. Postocular spine absent. Antennal peduncle as long as antennular peduncle. First pereopod chelate, sexually dimorphic, twisted by 45° laterally; ischium with small lower spine; merus with small lower spines decreasing in size distally, without proximal upper spine; carpus with moderate upper spine, but without median and lower spines mesially; propodus smooth on lower mesial face and upper border, slender (3 times as long as high) in females, very robust (less than 2 times as long as high) in males; fingers slender in females, dactylus with rounded tooth proximally, stout (as long as high) in males. Second pereopod merus without proximal upper spine; propodus 2.1–3.0 as long as high. Sixth pleomere without lateral spines; posterior border smooth. Uropodal endopod rectangular. Telson 0.7 to 1.0 as long as wide; inverted U-shaped carina with tubercles. First and third maxillipeds without epipods. Third maxilliped exopod flagellate. Arthrobranchs of type B. Embryos 750–1430 µm in diameter.

Distribution. Ranging in the Indo-West Pacific, from the Red Sea to northern Australia ( Sakai, 2006).

Habitat. Sand, mud, coral rubble and consolidated clay from the intertidal to 100 m (this study); also reported from coral rocks ( Ngoc-Ho, 2008).

Remarks. De Man (1905) did not specify how many specimens were available to him from “Baingsisi, Samau- Island, near Timor”, now Semau Island. Sakai (1975) first considered U. ancylodactyla as a junior synonym of U. amboinensis (de Man, 1888) , but later ( Sakai, 1982) corrected the identification of an illustrated specimen from Fiji Islands ( Sakai, 1975: fig. 2), describing it as U. fijiensis Sakai, 1982 .

The type material of U. darwinii and U. barbata also contained specimens of U. ancylodactyla according to Sakai (1982: 27). The egg diameter in gravid females of U. ancylodactyla seems to be somewhat variable. According to Sakai (1982), based on de Man (1928), the egg size is 0.9 mm. Ngoc-Ho (2008) listed 1.10–1.30 mm for specimens from Singapore and 1–1.1 mm for specimens from Aden; however, she earlier mentioned that the latter material, listed as U. ancylodactyla by Sakai (1982), was actually U. barbata (see also above).

Figures

Fig. 2. Specimens, habitus (dorsal and ventral views), showing colouration in life: a, Upogebia carinicauda (Stimpson, 1860), male (21/6.1) (NHMW 26035); b, same, male (23/6.6) (NHMW 26034); c, d, U. darwinii (Miers, 1884), ovigerous female (44/12.6) (NHMW 26038); e, U. hexaceras (Ortmann, 1894), male (23/7.0) (ZRC 2018.0557); f, same, ovigerous female (22/6.1) (NHMW 26042); g, U. ancylodactyla de Man, 1905, female (40/11.3) (ZRC 2018.0551); h, same, male (29/8.4) (ZRC 2018.0549). Not to scale. [Photographs by AA].