Rhinoecetes coclearis, Just, Jean, 2012

Just, Jean, 2012, Siphonoecetini Just, 1983 (Crustacea, Amphipoda, Ischyroceridae) 9: New species in Rhinoecetes Just, 1983, Cephaloecetes gen. nov. and Neoecetes gen. nov. from the south-eastern Australian shelf, Zootaxa 3234, pp. 1-42 : 20-25

Rhinoecetes coclearis sp. nov.

Figures 13–15

Type fixation. Holotype, male, here designated.

Etymology. The species name is from the Latin coclear meaning spoon, alluding to the characteristic broad, curved, spoon-shaped outer ramus of uropod 1.

Material examined. Holotype. 3, 7.0 mm, Eastern Bass Strait, 6 km WSW of Cape Conran, Victoria, 37°50’S, 148°40’E, 26 m, medium sand, epibenthic sled, M. Gomon and R. Wilson, FV Silver Gull, stn BSS 208, 30 July 1983, NMV J61807 .

Paratypes. Victoria, Bass Strait: Same data as holotype, NMV J9569 (3 Ƥ, 1 3, 3 young). Eastern Bass Strait, 45 km NE of North Point, Flinders Island, 39°31.2’S, 148°24.4’E, 40 m, medium sand, epibenthic sled, stn BSS 168, 15 November 1981, NMV J9566 (1 ovigerous Ƥ). Eastern Bass Strait, 20 km SE of Port Albert, 38°43.4’S, 146°56.9’E, 26 m, shell, epibenthic sled, R. Wilson, RV Tangaroa, Cruise 81-T-1, stn BSS 178, 18 November 1981, NMV J9567 (2 specimens). Eastern Bass Strait, 20 km SE of Port Albert, 38°43.4’S, 146°56.9’E, 26 m, shell, epibenthic sled, R. Wilson, RV Tangaroa, Cruise 81-T-1, stn BSS 178, 18 November 1981, NMV J9568 (14 specimens). Western Bass Strait, 40°05.6’S, 143°18.1’E, 123 m, medium sand, dredge, G.C.B. Poore, HMAS Kimbla , stn BSS 98, 11 October 1980, NMV J62372 (4 specimens).

New South Wales, Sydney: 500 m E of 32°57’31”S, 151°44’43”E, 14 m, coarse sand, Australian Museum Hunter District Water Board Survey, stn HDWBS 06020204, 22 August 1975, AM P23084 (ƤA, ovigerous, illustrated). 1.5 km E of Burwood Beach, 32°57’31”S, 151°44’43”, 28 m, coarse sand, Australian Museum Hunter District Water Board Survey, stn HDWBS 06030302, 22 August 1975, AM P23085 (1 3). 1.5 km E of Burwood Beach, 32°57’31”S, 151°44’43”, 28 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 06030305, 17 March 1975, AM P23086 (1 3, 2 Ƥ). 1.5 km E of Burwood Beach, 32°57’31”S, 151°44’43”E, 22 m, coarse sand, Australian Museum Hunter District Water Board Survey, stn HDWBS 06020304, 22 August 1975, AM P23087 (29 specimens including ovigerous Ƥ). 1.5 km E of Burwood Beach, 32°57’31”S, 151°44’43”, 22 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 06020302, 22 August 1975, AM P23088 (1 3). 1.5 km E of Burwood Beach, 32°57’31”S, 151°44’43”E, 28 m, mud and gravel, Australian Museum Hunter District Water Board Survey, stn HDWBS 06010303, 20 March 1975, AM P23089 (2 Ƥ). 1 km E of Burwood Beach, 32°57’31”S, 151°44’43”E, 24 m, fine sand, Australian Museum Hunter District Water Board Survey, stn HDWBS 06030205, 17 March 1975, AM P23090 (1 3, 1 Ƥ). East of Burwood Beach, 32°57’31”S, 151°44’43”E, 24 m, Australian Museum Hunter District Water Board Survey, 20 July 1975, AM P23091 (19 specimens including ovigerous Ƥ). 1.5 km E of Belmont Beach, 33°02’36”S, 151°40’50”E, 23 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 09010301, 18 March 1975, AM P23096 (1 ovigerous Ƥ). 1.5 km E of McMasters Beach, 33°30’S, 151°25’E, 20 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 05040303, 20 July 1975, AM P23097 (1 ovigerous Ƥ with abode and parasitic copepod). 1.5 km E of McMasters Beach, 33°30’S, 151°25’E, 20 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 05040303, 22 November 1975, AM P23098 (42 specimens including ovigerous Ƥ). 1 km E of McMasters Beach, 33°30’S 151°25’S, 20 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 05040202, 20 July 1975, AM P23099 (4 specimens). 1.5 km E of Belmont Beach, 33°02’36”S, 151°40’56”E, 18 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 09030201, 18 March 1975, AM P23101 (1 Ƥ). 1 km E of Belmont Beach, 33°02’36”S, 151°40’56”E, 22 m, Australian Museum Hunter District Water Board Survey, stn HDWBS 09010203, 18 March 1975, AM P23102 (1 ovigerous Ƥ). 1 km E of Burwood Beach, 32°57’31”S, 151°44’43”E, 24 m, fine sand, Australian Museum Hunter District Water Board Survey, stn HDWBS 06030201, 17 March 1975, AM P23103 (1 3). Botany Bay between the heads, 34°00’12”S, 151°14’E, 21 m, sand, New South Wales State Pollution Control Commission, stn 63, 24 January 1977, AM P31558 (1 specimen). Botany Bay between the heads, 34°00’12”S, 151°14’E, 13.5 m, sand, New South Wales State Pollution Control Commission, stn 64, 24 January 1977, AM P31559 (1 ovigerous Ƥ, 1 young). Botany Bay between the heads, 34°00’12”S, 151°14’E, 21 m, sand, New South Wales State Pollution Control Commission, stn 66, 25 January 1977, AM P31560 (3 ovigerous Ƥ, 7 other). Botany Bay between the heads, 34°00’12”S, 151°14’E, 20 m, sand, New South Wales State Pollution Control Commission, stn 67, 25 January 1977, AM P31561 (7 mostly young). Botany Bay between the heads, 34°00’12”S, 151°14’E, 18 m, sand, New South Wales State Pollution Control Commission, stn 68, 25 January 1977, AM P31562 (1 3). Botany Bay between the heads, 34°00’12”S, 151°14’E, 16 m, sand, New South Wales State Pollution Control Commission, stn 93, 8 January 1977, AM P31566 (1 3). Botany Bay, E of Sutherland Point, 34°02’S, 151°23’E, 20 m, New South Wales State Fisheries, 14 January 1975, AM P84641 (1 spent Ƥ). Jervis Bay: Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, airlift, P.B. Berents, 17 November 1981, AM P35078 (47 specimens). Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, airlift, P.B. Berents, 17 December 1982, AM P35079 (68 specimens). Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, airlift, P.B. Berents, 21 August 1982, AM P35080 (about 200 specimens Ƥ). Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, airlift, P.B. Berents, 21 August 1982, AM P35081 (4 specimens incl. ovigerous Ƥ). Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, core, P.B. Berents and A.R. Jones, 18 March 1983, AM P35082 (4 specimens). Off Moona Moona Creek, 35°03’S, 150°42’E, 8 m, sand, airlift, P.B. Berents, 29 January 1983, AM P35083 (> 100 specimens). Off Moona Moona Creek, south east of Huskisson, 35°03’S, 150°40’E, 8 m, broadly rippled sand with detritus, hand dredge, SCUBA, J. Just, P.B. Berents & R.T. Springthorpe, 15 November 1984, stn AU 64, AM P87047 (3 specimens). Off Moona Moona Creek, SE of Huskisson, 35°03’S, 150°40’E, 8 m, broadly rippled sand with some detritus, hand dredge, SCUBA. J. Just, P.B. Berents & R.T. Springthorpe, stn AU66, 16 November 1984, AM P87048 (4 specimens). Off Moona Moona Creek, SE of Huskisson, 35°03’S, 150°40’E, 8 m, fine sand with detritus along inner edge of low rock reef patch, hand dredge, SCUBA. J. Just, P.B. Berents & R.T. Springthorpe, stn AU67, 16 November 1984, AM P87049 (3 specimens). Off Moona Moona Creek, SE of Huskisson, 35°03’S, 150°40’E, 8 m, fine sand with detritus along inner edge of low rock reef patch, hand dredge, SCUBA. J. Just, P.B. Berents & R.T. Springthorpe, stn AU68, 16 November 1984, AM P87050 (2 specimens).

Queensland: Moreton Bay, Middle Banks, Cook and Newlands, 3–4 November 1976, QM W10652 (2 ovigerous Ƥ, 1 3). Moreton Bay, Middle Banks, Z.D.W.Q., September 1976, QM W11666 (1 3 with prosobranch abode).

Tasmania: Southeastern Tasmania, Blackmans Bay, just S of sewage works, 400 m offshore, 20 m, S. Halse, November 1984, TM G2845 (1 3). Eastern Tasmania, Wineglass Bay, 20 m, coarse sand, v. Veen grab, D.J. Dartnall, 5 June 1977, TMAG (2 Ƥ). Eastern Tasmania, off entrance to Little Swanport, 10 m, sandy bottom, v. Veen grab, A.J. Dartnall, 8 June 1977, TMAG (1 ovigerous Ƥ, 1 Ƥ, 2 young). Southeastern Tasmania, off Hellfire Bluff, S of Cape Bernier, 12 m, sandy bottom, v. Veen grab, A.J. Dartnall, 7 June 1977, TMAG (2 juveniles).

Description (holotype, 3). Head as long as pereonite 1 and 2/3 of 2 combined along dorsal midline; brows narrow; midanterior depression moderately deep, encompassing approximately 0.5 head length. Rostrum straight, in dorsal view with nearly parallel margins, reaching beyond apices of eye lobes with about one half its length, acutely pointed. Eye lobes rounded in lateral view, lower anterior margin with a bunch of long and shorter simple seta. Head and pereon with scattered small simple setae.

Antenna 1 approximately as long as head, pereonites 1–4 and half of 5 combined, reaching to apex of antenna 2 peduncle article 4; peduncle articles 1 and 2 with dense bunches of long setae ventrally; flagellum of 7+ articles, approximately as long as peduncle articles 1 and half of 2 combined. Antenna 2 approximately as long as head, pereonites 1–7 and pleonites 1–2 combined; ventral projection of peduncle article 2 about twice as long as wide at base, tapering to rounded apex, with long setae laterally and at apex; articles 4 and 5 with ventral groups of long simple setae, densest on article 5; article 5 length 0.9 of 4; flagellum articles 1 and 2 with medium sized robust setae.

Mouthparts, mandible palp article 1with 3 dorsal groups and 3 ventral groups of long setae, apex truncate surrounded by long setae; article 2 deeply embedded in article 1 apex.

Gnathopod 1 propodus length 2.9 width, with 4 posterior robust setae. Gnathopod 2 propodus length 1.75 greatest width. Pereopods 3–4 basis with fringe of unequally long setae along anterior margin, mid posterior margin with two groups of long setae, distolateral surface with 2 long setae; merus anterior and posterior margins with 5 groups of long setae. Pereopods 5–6 basis anterior margin with 2 groups of short setae in distal half and apical tuft of long setae, posterior margin with scattered short setae. Pereopod 7 propodus anterior margin with 5–6 groups of long setae.

Uropod 1 peduncle broad, with dorsolateral row of small simple setae and a few robust setae, and single robust seta in distomedial corner; outer ramus broad, inward curved, twisted into spoon-shape (see Fig. 15 up1 lv), 0.5 length of peduncle, lateral margin with row of 8 robust setae, medial margin smooth, dorsal surface with many small simple setae; inner ramus 0.75 length of outer ramus, straight, with 2 robust setae distomedially. Uropod 2 peduncle broad, approximately half length peduncle of uropod 1, lateral margin with row of short simple setae and distolateral tuft of long setae, distomedial margin with cluster of 3 robust setae; ramus 0.45 length of peduncle, slightly spoon-shaped, reaching beyond ramus uropod 3 with its entire length, distolateral margin with 3 robust setae. Uropod 3 peduncle with poorly developed medial projection; ramus with near circle of 8–9 long simple setae. Telson width approximately 1.5 length.

Female. Similar to male except uropod 1 inner ramus and ramus uropod 2 with a few more robust setae. Size. Largest 3, 7.0 mm, largest ovigerous Ƥ, 6.1 mm.

Colour and biology. Colour not recorded. Abode aggregations may comprise one male and up to three females ( Fig. 15 A).

Distribution. Eastern Australia from Moreton Bay, Queensland to Bass Strait and eastern and southern Tasmania, 13.5– 40 m.

Figures

FIGURE 13. Rhinoecetes coclearis sp. nov. Holotype, 3. a 2 flag, antenna 2 flagellum; c lv, head lateral view; c dv, head dorsal view; md l, left mandible, with palp enlarged. Habitus scale: 1 mm.

FIGURE 14. Rhinoecetes coclearis sp. nov. Holotype, 3. gp 1 – 2, gnathopods 1 and 2; p 4, p 6, pereopods 4 and 6; vp, ventral projection of antenna 2 article 2; us, urosome with uropods.

FIGURE 15. Rhinoecetes coclearis sp. nov. Paratype, ƤA, except A, paratype abode complex,. up 1, uropod 1 (lv, lateral view, vv, ventral view; up 2 vv, uropod 2 ventral view; note apical corona of tiny setules on both peduncles); us, urosome with uropods. Habitus scale: 1 mm.