Lyreidus tridentatus De Haan, 1841

Ahyong, Shane T., 2008, Deepwater crabs from seamounts and chemosynthetic habitats off eastern New Zealand (Crustacea: Decapoda: Brachyura), Zootaxa 1708 (1), pp. 1-72 : 11-12

Lyreidus tridentatus De Haan, 1841

( Figs 1E , 28F )

Lyreidus tridentatus De Haan, 1841: 140 , pl. 35: fig. 6 [type locality: Japan]. — McNeill 1953: 91. — Dell 1955: 148;

1963a: 243–244; 1963b: 20; 1968a: 23; 1968c: 234, 238. — Griffin 1970: 94–104, figs 1–5, 6a, e, f, j–n, o, 7a, b, 8a,

b, f, g, pl. 1A. — McLay 1988: 84, fig. 15. — Davie 2002: 486–487. — Poore 2004: 322, fig. 94a, pl. 18e. Lyreidus elongatus Miers, 1879: 46 [type locality: Kada Bay, Japan]. Lyreidus australiensis Ward, 1933: 377 , pl. 23: fig 10 [off Newcastle, New South Wales, Australia]. — Richardson &

Kreft 1949: 69–71, fig. 1. Lyreidus fossor Bennett, 1964: 9 , 24–26, figs 5–9, 106 [type locality: N of Whale Island , Bay of Plenty] .

Material examined. Mahina Knoll: NIWA 6726 , 1 female (cl 40.6 mm), 37°19.76–19.64’S, 177°04.38– 04.63’E, 350–380 m, TAN0413/128, 14 Nov 2004 .

Off White Island: NIWA 34967 , 1 female (cl 12.5 mm), 37°28.14–28.11’S, 177°06.97–06.51’E, 230–318 m, KAH9907/50, 5 Jun 1999 .

Tuatoru Seamount: NIWA 6717 , 2 females (cl 21.6–24.5 mm), 37°28.28–28.32’S, 177°12.30–12.59’E, 295– 200 m, TAN0413/68, 11 Nov 2004 ; NIWA 6718 , 4 males (cl 11.5–20.3 mm), 3 females (cl 24.0– 31.9 mm), 37°28.19–28.33’S, 177°13.20–12.94’E, 200– 175 m, TAN0413/74, 12 Nov 2004 ; NIWA 6719 , 1 damaged female, 37°28.84–28.64’S, 177°13.74–13.57’E, 454– 317 m, TAN0413/76, 12 Nov 2004 ; NIWA 6720 , 1 male (cl 38.5 mm), 1 female (cl 19.5 mm), 37°28.26–28.48’S, 177°12.89–12.82’E, 180– 177 m, TAN0413/77, 12 Nov 2004 ; NIWA 6721 , 1 male (cl 15.5 mm), 1 female (cl 14.9 mm), 37°28.30–28.49’S, 177°13.49– 13.24’E, 218–220 m, TAN0413/84, 12 Nov 2004 ; NIWA 6722 , 1 male (cl 23.1 mm), 37°29.14–28.89’S, 177°12.92–12.86’E, 400– 225 m, TAN0413/92, 12 Nov 2004 ; NIWA 6723 , 3 males (cl 15.1–16.5 mm), 3 females (cl 15.0– 46.6 mm), 37°28.58–28.40’S, 177°12.94–12.73’E, 180– 179 m, TAN0413/93, 13 Nov 2004 .

Tumokemoke Seamount: NIWA 6727 , 2 males (cl 14.2–15.5 mm), 1 female (cl 23.9 mm), 37°28.36– 28.22’S, 176°55.13–54.97’E, 260– 219 m, TAN0413/152, 15 Nov 2004 ; NIWA 18048 , 4 males (cl 15.4–31.6 mm), 37°27.46–27.64’S, 176°54.08–54.24’E, 312– 278 m, TAN0413/160, 15 Nov 2004 ; NIWA 6728 , 4 males (cl 14.5–37.7 mm), 2 females (cl 14.5–22.8 mm), 37°28.02–28.13’S, 176°55.13–54.98’E, 232– 218 m, TAN0413/161, 15 Nov 2004 ; NIWA 6729 , 6 specimens, 37°28.27–28.20’S, 176°55.21–55.07’E, 262– 230 m, TAN0413/162, 15 Nov 2004 ; NIWA 6730 , 1 damaged male, 37°28.4–28.11’S, 176°55.79–55.58’E, 315– 283 m, TAN0413/163, 15 Nov 2004 ; NIWA 6731 , 1 male (cl 14.5 mm), 2 females (cl 15.1–35.0 mm), 1 damaged (cl 25.0 mm), 37°28.00–28.16’S, 176°54.91–54.87’E, 225– 210 m, TAN0413/164, 15 Nov 2004 ; NIWA 6732 , 3 males (cl 11.3–15.3 mm), 3 females (cl 14.6–15.2 mm), 37°28.19–28.15’S, 176°55.15–54.94’E, 240– 212 m, TAN0413/166, 15 Nov 2004 ; NIWA 6733 , 2 males (cl 23.9–26.5 mm), 37°27.61–27.72’S, 176°55.59– 55.48’E, 320– 302 m, TAN0413/167, 15 Nov 2004 ; NIWA 6734 , 2 males (cl 11.6–16.4 mm), 1 female (cl 25.4 mm), 37°27.69–27.87’S, 176°54.81–54.85’E, 294– 247 m, TAN0413/170, 16 Nov 2004 .

Rungapapa Seamount: NIWA 6724 , 1 male (cl 17.3 mm), 37°33.41–33.18’S, 176°58.94–59.05’E, 266– 197 m, TAN0413/97, 13 Nov 2004 ; NIWA 6725 , 1 damaged female, 37°32.11–32.20’S, 176°58.26–58.32’E, 217– 169 m, TAN0413/112, 13 Nov 2004 .

Remarks. Lyreidus tridentatus is easily recognised by its smooth, elongated, pod-shaped carapace. It was frequently collected with Bellidilia cheesmani ( Filhol, 1886) and Ebalia tuberculosa (A. Milne-Edwards, 1873) on Tumokemoke Seamount.

Distribution. Western Indian Ocean and western Pacific from Japan to Hawaii, Fiji, Australia and New Zealand around the whole of the North Island; 27–512 m ( McLay 1988; Takeda & Webber 2006).

Figures

FIGURE 1. A, Dagnaudus petterdi (Grant, 1905), female, pcl 44.1 mm (NIWA 34784). B, Homolodromia kai Guinot, 1995, female, cl 19.9 mm, cw 14.6 mm (NIWA 6761). C, Dicranodromia spinulata Guinot, 1995, male, cl 9.6 mm, cw 6.8 mm (NIWA 34933). D, Cymonomus clarki sp. nov., ovigerous female holotype, cl 6.9 mm, cw 6.6 mm (NIWA 29666). E, Lyreidus tridentatus De Haan, 1841, female, cl 46.6 mm (NIWA 6723). F, Cymonomus aequilonius Dell, 1971, female, cl 7.7 mm, cw 6.7 mm (NIWA 34966).

FIGURE 28. A–B, Ethusina castro sp. nov., ovigerous female holotype, cl 14.1 mm (NIWA 6067), dorsal and ventral views. C, Trichopeltarion fantasticum Richardson & Dell, 1964, female, cl 53.1 mm (NIWA 6754). D, Trichopeltarion janetae sp. nov., male, cl 27.9 mm (NIWA 29650). E, Chaceon yaldwyni Manning, Dawson & Webber, 1990, 1 male, cl 55.2 mm (NIWA 6716). F, Lyreidus tridentatus De Haan, 1841, male, cl 38.5 mm (NIWA 6720). Photo credits: R. Stewart (A–C, E–F), C. Marriot (D).