Praedatrypaea propinqua (De Man, 1905 )

Poore, Gary C. B., 2023, New records, one new genus and 21 new species of Callianassidae (Crustacea, Axiidea) from the Indo-West Pacific, Memoirs of Museum Victoria 82, pp. 167-255 : 220

Praedatrypaea propinqua (De Man, 1905)

Figure 36

Callianassa propinqua De Man, 1905: 609 .— Ngoc-Ho, 1991: 290–292, fig. 4.— Sakai, 1999: 51.— Sakai, 2005: 100–101.

Callianassa (Cheramus) propinqua .— De Man, 1928a: 27, 98, 127, pl. 12 fig. 18.

Callianassa propinqua .— Ngoc-Ho, 1994: 54, fig. 2d–f.

Cheramus propinquus .— Tudge et al., 2000: 145.—Davie, 2002: 459.— Sakai, 2011: 371–372.

Lipkecallianassa sp. MoV 4960.— Poore et al., 2008: 96.

Praedatrypaea propinqua .— Poore et al., 2019: 139, 143.

Material examined. Papua New Guinea, off Cape Croisiles , 04° 53' S, 145° 49' E, 370 m ( PAPUA NIUGINI stn DW4031 ) , MNHN IU-2013- 12310 (female, 5.0 mm) . Australia WA, North West Shelf , between Timor Sea and off Ningaloo : 12.434° S, 123.601° E, 100 m ( CSIRO stn SS05/2007/185) , NMV J60028 (juvenile) ; 12.4343° S, 123.601° E, 100 m ( CSIRO stn SS05/2007/186) , NMV J60033 (2 females, 1.0 mm) ; 17.4408° S, 120.439° E, 200 m ( CSIRO stn SS05/2007/94) , NMV J60029 (female, 3.1 mm) ; l 8° 50' S, 117° 39' E, 178 m ( MV stn NWA 29 ) , NMV J22660 (male, 2.1 mm; ovigerous female, 2.8 mm) , 19° 5' S, 117° 26' E), 120 m ( MV stn NWA 52 ) , NMV J22661 (2 females, 2.8 mm) ; 19.7503° S, 115.367° E, 200 m ( CSIRO stn SS05/2007/32) , NMV J60026 (female, 3.9 mm) ; 21.986° S, 113.82° E, 165 m ( CSIRO stn SS10/2005/153) , NMV J53451 (ovigerous female, 3.8 mm) ; 22.079° S, 113.796° E, 201–206 m ( CSIRO stn SS10/2005/146) , NMV J53452 (4 females, 3.6 mm [one with Bopyridae in branchial chamber]) ; NMV J71760 (male, 4.0 mm).

Diagnosis. Antennular peduncle reaching midpoint of antennal peduncle article 5. Maxilliped 3 ischium about twice as long as wide; merus with lobed mesiodistal corner, about 1.2 times as wide as long, with tooth on convex distal margin. Chelipeds meri upper margins each unarmed. Major cheliped merus lower margin with spine at midpoint; carpus 1.0–1.2 times as long as wide; palm 1.4–1.7 times as long as carpus, 1.3–1.4 times as long as wide; fingers, cutting edges with obsolete teeth. Uropod endopod 1.5–1.7 times as long as wide; anterior margin convex, with two distal stout setae; distal-posterior margin not differentiated from anterior margin, more convex distally; dorsal face with row of three (rarely four) spiniform setae proximally and close to anterior margin. Uropod exopod rectangular, truncate distally, 1.6–1.9 times as long as wide; anterior margin straight, setose. Telson 1.2–1.3 times as long as wide, widest at strong lateral lobes at about one quarter length; posterior margin convex, with median spine; with two pairs of spiniform setae on posterolateral margins. Male pleopod 1 2-articled or filiform; pleopod 2 biramous or minuscule.

Distribution. Tropical Southwestern Pacific, Western and Eastern Coral Triangle, Sahul Shelf, Northwest Australian Shelf ( New Caledonia; Indonesia [type locality: North Sulawesi, Kwandang Bay, 75 m]; Papua New Guinea; Australia, northwestern WA); 75– 300 m.

Remarks. Callianassa propinqua was described from Kwandang, North Sulawesi, Indonesia at 75 m (De Man, 1905) and has been subsequently reported from New Caledonia ( Ngoc-Ho, 1991) and the North West Shelf of Australia ( Ngoc-Ho, 1994), where it seems relatively common. Some of the ratios of and between articles used to diagnose the species are variable between individuals.

The male from New Caledonia differs from the Indonesian and Australian specimens in having several teeth along the lower margin of the major cheliped merus and a rounder merus of maxilliped 3. This male possesses a two-articled male pleopod 1 and a biramous pleopod 2; the only male from Australia has a filiform pleopod and minuscule bud-like pleopod 2 (fig. 36h).

Figures

Figure 36. Praedatrypaea propinqua (De Man, 1905). Australia, North West Shelf. NMV J53452, female (with Bopyridae in right branchial cavity), 3.6 mm: a, b, carapace, eyestalks, antennular, antennal peduncles (lateral, dorsal views); c, telson, right uropod; d, maxilliped 3; e, major cheliped (right, mesial view); f, g, pereopods 2, 3. NMV J71760, male, 4.0 mm; h, right pleomeres 1, 2 lower margins, pleopods 1, 2 (lateral view in situ). NMV J53451, female, 3.8 mm: i, major cheliped (right, mesial view); j, minor cheliped (left, mesial view). NMV J22661, female, 2.8 mm: k, telson, left uropod. NMV J22660, female, 2.8 mm: l, maxilliped 3. Scale bars = 1 mm.