Chlamydella favus (Hedley, 1902)

Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), Records of the Australian Museum (Rec. Aust. Mus.) 70 (2), pp. 113-330 : 160-161

Chlamydella favus (Hedley, 1902)

Figs 21C,F–L, 22, 23A,D

Cyclopecten favus Hedley, 1902: 305 , fig. 50; Gatliff & Gabriel, 1911: 200; May, 1921: 11; Gabriel, 1956: 14.

Cyclopecten obliquus Hedley, 1902: 306 , fig. 51.

Chlamydella favus (Hedley) .– Iredale, 1929: 164; Macpherson & Chapple, 1951: 145; Iredale & McMichael, 1962: 11.

Chlamydella fava [sic] (Hedley).–Cotton & Godfrey, 1938: 98, fig. 85 (after Hedley); Cotton, 1961: 103, fig. 89.

Chlamydella obliqua (Hedley) .–Iredale & McMichael, 1962: 11.

Cyclochlamys favus (Hedley) .–Dijkstra, 1995b: 40, figs 87-90; Dijkstra, 2001: 88; Dijkstra & Maestrati, 2008: 101.

Type data. Cyclopecten favus : holotype (pr) AM C.013231, 20 + paratypes (v) AM C.171633. Type locality: Australia, New South Wales, 5.5–7.5 miles [9–12 km] NE of Cape Three Points , 33°28'S 151°33'E, alive, 75–91 m (Thetis stn 13) .

Cyclopecten obliquus : holotype (lv) AM C.013234, 70 + paratypes (v) AM C.013232, C.013233. Type locality: Australia, New South Wales, 5–8 miles [8–13 km] off Port Kembla , 34°28'S 151°06'–03'E, dead, 115–137 m (Thetis stn 49) .

Additional material examined. — AUSTRALIA: QUEENSLAND: GBR, Lizard Island, South Island , SW reef face, 14°42'S 145°27'E, dead, 9–12 m (1 v, C.338077) ; off Cairns, outer Barrier Reef, Euston Reef , SW side of reef, 16°41'S 146°15'E,dead, 21 m (5 v,C.269876) ; GBR, Swain Reefs, 3km NE of W side of Gillett Cay , 21°42'S 152°26' E,dead, 64–73 m (1 v, C.338078; 15 v, C.165519 [in part]) ; SE of Swain Reefs , 22°20'S 153°17'E, dead, 187 m (2 v [ var. obliqua ], C.461401; 19 v, C.463128) ; SE of Swain Reefs , 22°31.11' S 152°42.63'E, dead, 78 m (4 v, C.157671) ; Capricorn Group, Heron Island , 23°26'S 151°57'E,dead, 8 m (3 v,C.338074) ; E of Lady Musgrave Island , 23°50.1'S 152°32.1'E,dead, 132 m (6 v, C.157666;9 v [ var. obliqua ], C.157667) ; Noosa Heads , 26°23'S 153°06'E, dead, beach (2 v, C.338073); off Maroochydore, 26°41.2' S 153°38.4'E, dead, c. 200 m (6 v, C.165520) ; Caloundra , 26°49'S 153°10'E, dead (2 v, C.338076); NNE of Cape Moreton, 26°50'– 26°55'S 153°36' E, dead, 183 m (21 v, C.338069) ; NE of Cape Moreton , 26°55.5'S 153°33.5'E, alive, 115–124 m (1 pr + 14 v, C.338072) ; off Cape Moreton , 27°0'S 153°35'E, alive, 128–183 m (1 pr + 24 v, C.338068) ; off Moreton Bay , 27°27.37'S 153°39'E, alive, 77 m (4 pr + 2 v, C.338070) ; off Moreton Bay , 27°31'S 153°40'E, dead, 75–80 m (1 v, C.338071) ; off S end Frazer Island , 27°57.13'S 153°51.05' E,dead, 201 m (1 v,C.338075) . NEW SOUTH WALES: 6 km E of Cudgen, S of Tweed Heads , 28°14'S 153°37'E, dead, 35 m (1 v, C.337218) ; 12.5 ml E of Cape Byron , 28°38'S 153°52'E, dead, 203 m (2 v,C.019805) ; off Ballina , 29°10'S 153°43'E,dead, 86 m (2 v,C.337219) ; E of Yamba , 29°30' S 153°22'E, dead, 13 m (3 v, C.157722) ; E of Yamba , 29°30' S 153°26'E, dead, 53 m (2 v, C.157721) ; 12 km E of Cakora Point, S of Yamba , 29°39'S 153°26'E, dead, 55 m (many v, C.337215) ; N of Coffs Harbour , 29°39'S 153°37'E, dead, 82 m (9 v, C.337217) ; N of Coffs Harbour , 29°40'S 153°30'E, dead, 71 m (6 v, C.157720) ; N of Coffs Harbour , 30°0'S 153°23'E, dead, 61 m (many v, C.337216) ; 9 ml NE of Coffs Harbour , 30°15'S 153°19'E, dead, 73–82 m (7 v, C.337220) ; NE of Port Macquarie , 31°23'S 153°12'E,dead, 183 m (2 v, C.037766) ; off Laurieton , 31°39'S 152°55'E,dead, 73 m (many v, C.337214) ; Port Stephens, near Hawks Nest , 32°41'S 152°10'E, dead, 5 m (6 v, C.337211) ; Port Stephens, near Soldiers Point , 32°42'S 152°04' E, dead, 7 m (1 v, C.337210) ; Port Stephens, near Soldiers Point , 32°42'S 152°04' E, dead, 5–9 m (5 v, C.337212) ; Port Stephens, 32°42'S 152°05'E, dead (3 v, C.012157; 3 v, C.012180; 14 v, C.337206); Port Stephens , 32°42'S 152°05'E, dead, 45–73 m (10 v, C.337213) ; Port Stephens, Fly Point , 32°43'S 152°09'E,alive, 18 m (5 pr, C.337204) ; Port Stephens, Fly Point , 32°43'S 152°09'E, alive, 8 m (many, C.339143) ; Port Stephens, Halifax Bay, between Shoal Bay & Nelson Bay , 32°43'S 152°09'E, dead (15 v, C.337207); Port Stephens , off Nelson Head , 32°43'S 152°10' E, alive, 15–24 m (4 pr, C.337203; 2 pr, C.337208; 2 v, C.337209) ; Port Stephens, off Nelson Bay , 32°43' S 152°15'E, dead, 46–73 m (many v, C.337205) ; Port Stephens, Fingal Bay, 32°45'S 152°10'E, dead (2 v, C.157583); off Newcastle , 32°53'S 152°35'E, dead, 146–175 m (4 v, C.157654) ; 18 km E of Newcastle , 32°55'S 151°58' E, dead, 70 m (2 v, C.337201) ; off Tuggerah Lake , 33°20' S 151°39' E,dead, 60 m (1 v,C.337202) ; off Sydney , 33°27' S 152°05'E,dead, 366 m (4 v, C.337187) ; 9–12 km NE of Cape Three Points , 33°32'– 33°31'S 151°31'– 151°34.9'E,alive, 75–91 m (1 pr, C.013231; many, C.013232; many v, C.171633; 1 pr, C.337200) ; Broken Bay, Patonga, 33°33'S 151°16'E, dead (1 v, C.337199); off Broken Bay , 33°34'S 151°31'E, dead, 82–137 m (1 v, C.337198) ; 22 ml E of Narrabeen, N of Sydney , 33°42'S 151°43'E,dead, 146 m (many v, C.026068;many v,C.026069) ; Collaroy Beach, N of Sydney, 33°44'S 151°18'E,dead (1 v, C.337181;many v,C.337182); Sydney, off Long Reef , 33°44' S 151°21'E, alive, 43 m (1 pr, C.339144) ; N of Sydney , 33°45'S 151°21'E, dead, 40 m (2 v, C.337189) ; off Sydney , 33°46'S 151°43' E, dead, 176 m (1 v, C.157578; 5 v, C.337186) ; Sydney, Port Jackson, North Harbour , 33°48'S 151°16'E, dead (many v, C.337172; 1 v, C.337173); Sydney , Middle Harbour, off Chinamans Beach , 33°48'S 151°14'E, dead, 3–7 m (4 v, C.337174) ; Sydney, Manly Beach, Ocean beach, 33°48'S 151°17'E, dead (15 v, C.337196; many v, C.337197); Sydney , Middle Harbour, off Balmoral , 33°49' S 151°15'E, dead, 3–9 m (many v, C.337171) ; Sydney Harbour,Quarantaine Bay, North Head, 33°49'S 151°17'E, dead, 27 m (9 v,C.337175) ; 44 km E of Sydney Heads , 33°50'S 151°49'E,dead, 549 m (many v,C.024346) ; Sydney Harbour, Watsons Bay, 33°50'S 151°16'E, dead (1 v, C.011600); Port Jackson, Watsons Point,off Green Point , 33°50'S 151°16'E,alive, 15 m (many,C.032207;2 v,C.337162) ; Port Jackson, Western Channel , 33°50'S 151°16'E, dead, 27 m (1 v, C.337168) ; Sydney Harbour, Western Channel, off Sow & Pigs Reef, 33°50'S 151°16'E, alive, 11–16 m (2 v, C.337161; 1 pr, C.337169) ; Sydney Harbour, Nielson Park, Bottle & Glass Rocks, 33°50'S 151°16'E, dead, 11–17 m (8 v, C.337163; 9 v, C.337177) ; Sydney, off North Head , 33°50'S 151°18' E,dead, 33 m (1 v, C.337194) ; Port Jackson, Balmain,off Morts Dock , 33°51'S 151°11'E, dead, 7 m (7 v, C.337176) ; 50 km E of Sydney , 33°51'S 151°58'E, dead, 1463 m (many v, C.026642) ; off Sydney , 33°52'S 151°40'E, dead, 200 m (10 v, C.337188) ; Sydney, 33°53'S 151°13'E, dead (14 v, C.018530); Sydney, South Coogee , 33°55'S 151°15'E, dead, 10 m (1 v, C.337178) ; Sydney , 2 km E of Minstral Point, 33°56'S 151°16'E,dead, 38 m (5 v,C.337191) ; Sydney , 6 km E of Minstral Point, 33°56'S 151°19'E, dead, 61 m (many v, C.337192) ; Sydney , 2 km SE of Long Bay, 33°58'S 151°16'E, alive, 29 m (5 pr,C.337190) ; Sydney , 5 km E of Long Bay, dead, 77 m (1 v, C.337195) ; off Sydney , 33°58'– 33°52'S 151°29'– 151°22'E, dead, 75–150 m (many v, C.337183) ; off Sydney , 33°58'S 151°29'E, dead, 150 m (many v, C.337184) ; Sydney , 2.3 km E of Malabar, 33°59'S 151°16' E, dead, 66 m (1 v,C.337193) ; off Botany Bay , 33°59'S 151°33'E, dead, 194 m (4 v, C.337156) ; Botany Bay, Kurnell, 34°0'S 151°12'E,dead (1 v,C.337167); Sydney S, Bate Bay , Cronulla Beach , 34°02'S 151°10'E, dead (many v, C.337152); Sydney , N of Cronulla, Boat Harbour, 34°02'S 151°12'E, dead, 2 m (1 v, C.337160) ; Port Hacking, Gunnamatta Bay , 34°03'S 151°08' E, dead (3 v, C.337151;1 v,C.337170);off Cronulla, 34°03'S 151°12' E,dead, 64 m (5 v,C.337155) ; E of Sydney , 34°03'S 151°37'E, dead, 295 m (3 v, C.337185) ; off Cronulla , 34°04' S 151°14' E,dead, 40–100 m (many v, C.337154) ; Port Hacking, 34°04'S 151°06'E, dead (10 v, C.337164); Port Hacking, Gunnamatta Bay , 34°04'S 151°08' E, channel at SW end,dead (4 v, C.337166);off Sydney , 34°04'S 151°37'E, dead, 384 m (6 v,C.337179) ; Port Hacking, off Jibbon , 34°05' S 151°13'E, dead, 70–85 m (3 v, C.337149; many v, C.337150; 7 v,C.337157) ; Port Hacking,off Jibbon ( Hacking ) Point , 34°05' S 151°14'E, dead, 70 m (1 v,C.337165) ; 32 km NE of Wollongong , 34°18'S 151°25'E, alive, 457 m (3 pr,C.155824) ; off Wollongong , 34°22'S 151°27'E,alive, 439–446 m (10 pr,C.339142) ; 16 ml E of Wollongong , 34°25'S 151°15'E, dead, 183 m (many v, C.018284) ; off Wollongong , 34°26'S 151°15'E, dead, 183 m (1 v, C.337144) ; 5-8 ml off Port Kembla , 34°27' – 34°30'S 151°04' – 151°0.9'E,dead, 115–137 m (many v, C.013233;1 v, C.013234; many v,C.013239) ; Gerringong, Werri Beach , 34°44'S 150°50'E,dead (1 v,C.337158); off Crookhaven, 34°55'S 150°54'E, dead, 55–64 m (many v, C.337148) ; 44 km E of Nowra , 34°55.79'– 34°56.06'S 151°08.06'– 151°07.86'E, alive, 429–466 m (16 pr [smooth],VM F.60168) ; Beecroft Peninsula, Honeymoon Bay , 35°03' S 150°46'E,alive, 7 m (1 pr, C.339141) ; 8 km off Sussex Inlet, Wreck Bay , 35°12' S 150°36'E, alive, 37 m (13 v, C.022406) ; off Brush Island , 35°35'– 35°37'S 150°40'– 150°41'E, dead, 165 m (1 v, C.155818) ; Pebble Beach, 35°36'S 150°19'E, dead (1 v, C.337147); off Batemans Bay , 35°46'S 150°25'E, dead, 110 m (4 v, C.337139) ; off Montague Island, Narooma , 36°15'S 150°13'E,alive, 9–16 m (8 v,C.337137) ; off Montague Island, Narooma , 36°15'S 150°15'E,dead, 101 m (2 v, C.337145;4 v,C.337146) ; Bermagui, Shelly Beach , 36°25'S 150°05'E, dead (4 v, C.337143); off Merimbula, 36°55'S 150°0'E, dead, 55–82 m (15 v, C.337153) ; Pambula , 36°56'S 149°55' E, dead (1 v, C.011772); off Eden, 37°00.60'S 150°20.70' E,alive, 363 m (7 pr [smooth],VM F.60165) ; Twofold Bay, 37°05'S 149°54'E, alive (6 v, C.337138); Twofold Bay , 37°05'S 149°57'E, dead, 37 m (1 v, C.337140) ; 15 ml off Twofold Bay , 37°22'S 150°02'E,dead, 75 m (9 v,C.337141) ; 20 ml SE of Twofold Bay , 37°26'S 150°15'E,dead, 149 m (5 v,C.337142) . VICTORIA: Mallacoota, 37°34'S 149°56'E, dead (4 v, C.337225); SSE side of Gabo Island , 37°34'S 149°55'E, dead, 15–18 m (1 v,C.337226) ; off Mallacoota , 37°40'S 149°47'E,dead, 73 m (2 v,C.337227) ; 15 km S of Gabo Island , 37°43'S 149°57' E, dead, 95 m (1 v, C.337228) ; 12 km S of Ram Head , 37°50' S 149°37'E, dead, 119 m (1 v, C.157719) ; between Cape Howe & Lakes Entrance, 37°55'S 149°0'E, dead, 75–78 m (1 v, C.337223) ; 30 km SW of Cape Everard , 38°03'S 149°08'E, dead, 119 m (9 v, C.337236) ; Bass Strait , 36 km S of Cape Conran, 38°08'S 148°43' E,dead, 107 m (4 v,C.337238) ; Bass Strait , 44 km S of Marlo, 38°12'S 148°35'E,dead, 146 m (2 v,C.337239) ; between Cape Howe &Lakes Entrance, 38°13'S 149°06'E, dead, 146–158 m (10 v, C.337222) ; Western Port Bay, Warneet Channel , 38°14'S 145°19'E, alive, 4 m (4 pr, C.337229) ; c. 43 km SE of Cape Everard , 38°15' S 149°12'E, dead, 165–274 m (2 v, C.337231) ; Western Port Bay , between Eagle & Crawfish Rock, NW arm, 38°16'S 145°17'E, alive, 3–5 m (3 pr + 8 v, C.337230) ; Bass Strait,SW of Lakes Entrance , 38°17'S 147°40' E,dead (2 v,C.337998); Bass Strait, c. 40 km S of Lakes Entrance, 38°31.7'S 147°91.7'E, dead, 60 m (7 v, C.338081) ; S of Point Hicks , 38°17.70'S 149°11.30'E,alive, 400 m (many, VM F.60164) ; Point Nepean , 38°18' S 144°39'E,dead (4 v,C.013537); Bass Canyon,33 ml [53 km] S of Cape Conran, 38°18'S 148°39' E,dead, 750 m (7 v, C.337234) ; S of Point Hicks , 38°21.90'S 149°20' E, alive, 1000 m (1 pr [ var. obliqua ],VM F.60159) ; Western Point , 38°22'S 145°32'E,dead, 5–9 m (2 v, C.018663) ; Port Fairy , 38°23'S 142°14'E, dead (3 v, C.337233); 30 ml [48 km] S of Cape Everard, 38°30' S 149°30'E, dead, 366 m (2 v, C.337232) ; Bass Strait , c. 56 km S of Lakes Entrance, 38°50'S 147°91.7'E, dead, 63 m (1 v, C.338080) . TASMANIA: Bass Strait, midway between Cape Everard & Flinders Island , 39°0' S 148°30' E, dead, 126 m (7 v, C.337997) ; Bass Strait , 25 ml S of Wilsons Promontory, 39°19'S 146°12'E, dead, 76 m (2 v, C.337224) ; Bass Strait, Erith (Deal) Island , 39°27'S 147°17'E, alive, 6 m (5 pr + 1 v, C.338026) ; Bass Strait, Murray Pass, Deal Island , 39°28' S 147°18'E, alive, 30–50 m (10 pr, C.338024;13 pr,C.338025) ; Bass Strait, Deal Island, Little Squally Cove , 39°30' S 147°20'E, alive, 10–30 m (4 pr + 1 v, C.338031) ; Bass Strait, Deal Island, East Cove , 39°30'S 147°20'E, alive, 6–15 m (8 pr, C.339147) ; N of Hummock Island , 40°09'S 145°35'E, dead, 64 m (6 v, C.338006) ; N of Hummock Island , 40°09' S 145°11'E, dead, 51 m (3 v, C.338034) ; Bass Strait , S of King Island, 40°22'S 143°39' E, dead, 128 m (7 v, C.338005) ; S of King Island , 40°24'S 143°34'E, dead, 110 m (8 v, C.338004) ; off Cape Naturaliste , 40°48' S 148°27'E, dead, 51 m (3 v, C.338018) ; W of West Point , 41°01'S 144°21'E, dead, 80 m (1 v, C.338010) ; Tamar River mouth, Green’s Beach, West Head , 41°05' S 146°45'E, dead (1 v,C.338030); S of West Point, 41°09'S 144°24' E,dead, 88 m (3 v,C.338009) ; off St.Helens Point , 41°20' S 148°30'E, dead, 110 m (2 v, C.338019) ; SW of Sandy Cape , 41°39'S 144°37'E, dead, 130 m (1 v, C.338008) ; off Freycinet Peninsula , 41°57.50' S 148°37.90'E, alive, 400 m (1 pr,VM F.60163) ; S of Cape Lodi , 42°0'S 148°18' E,dead, 28 m (1 v,C.338020) ; Great Oyster Bay , 42°20'S 148°13'E, dead, 45 m (3 v, C.338021) ; 2.5 ml NE Beaching Bay, Maria Island , 42°27.5' S 148°12'E, dead, 82.5 m (many v, C.338028) ; off Marion Bay , S of Maria Island, 42°50'S 147°59.8' E, alive, 58 m (1 pr + 7 v, C.337999) ; S of Maria Island , 42°50'S 148°07'E, dead, 84 m (15 v, C.338035) ; Pirates Bay, Eaglehawk Neck, 43°01'S 147°54' E,dead(1 v,C.338023); Tinderbox Bay , S of Hobart, 43°03'S 147°20'E, dead, 15 m (many v, C.338032) ; 9.5 ml NE of Tasman Island , 43°12'S 148°13'E, dead, 570 m (1 v,C.338027) ; off Port Davey , 43°13'S 145°36'E,dead, 132 m (15 v,C.338011) ; off Cape St.Vincent , 43°15' S 145°30'E, dead, 155 m (1 v,C.338003) ; W of Port Davey , 43°20'S 145°48'E, dead, 82 m (4 v,C.338012) ; S of Storm Bay , 43°20' S 147°37' E,dead, 97 m (11 v,C.338014) ; off Port Davey , 43°22'S 145°44'E,dead, 144 m (4 v, C.338002) ; D’Entrecasteaux Channel, Partridge Island ,SE side, 43°23' S 147°06'E, dead, 16–20 m (1 v, C.338033) ; 11 ml SW of Cape Raoul , 43°25'S 147°45'E, alive, 117 m (many, C.338022) ; 2 ml S Tasman Head, S Bruny Island , 43°33'S 147°19'E, dead, 73 m (2 v, C.338029) ; S of Storm Bay , 43°35'S 147°32'E, dead, 121 m (2 v, C.338017) ; SE of South West Cape , 43°38'S 146°07'E,dead, 119 m (1 v,C.338013) ; S of D’Entrecasteaux Channel , 43°40'S 146°50'E, dead, 104 m (many v, C.338016) ; S of South East Cape , 43°49'S 146°33'E,dead, 159 m (4 v,C.338015) ; S of South East Cape , 43°55'S 146°51'E, dead, 168 m (3 v, C.338001) ; N of Macquarie Harbour , 44°19'S 144°51'E,dead, 170 m (1 v, C.338007) . SOUTH AUSTRALIA: c. 35 ml [56 km] SW of Neptune Islands , dead, 190 m (2 v, SAM D19019) ; Cape Jaffa, dead, 165–238 m (2 v, SAM D19020) ; off Cape Borda ,dead, 110 m (2 v, SAM D19021) ; off Beachport ,dead, 73 m (2 v, SAM D19022) ; Beachport, off Cape Martin , 38°12.5'S 140°0'E, dead, 667 m (many v, C.165455) ; 80 km SE of Kangaroo Island , 37°0'S 138°33' E,dead, 77 m (1 v,C.338059) ; 64 km S of Cape Wiles , 35°39'S 136°40'E, dead, 174–183 m (many v, C.032058) ; N of Cape Borda ,35°20'– 35°42'S 136°35' E,dead, 73 m (2 v,C.338058) ; SW of Cape Carnot , 35°15'S 134°32'E, dead, 150–178 m (3 v, C.338060) ; S of St. Francis Island , 33°0'– 33°05'S 133°05'– 133°10' E, dead, 64 m (2 v, C.338057) ; Great Australian Bight , SW of CapeAdieu, 32°42'S 131°27' E,dead, 79 m (1 v,C.338061) . WESTERNAUSTRALIA: Great Australian Bight , 33°20' S 128°45'E, dead, 140–147 m (2 v, C.338062) ; Great Australian Bight , 33°05'S 128°40'E,dead, 75 m (3 v,C.338056) ; RechercheArchipelago , 34°27.5'S 122°0.3'E,dead (1 v,C.165124); RechercheArchipelago, 34°19.5'S 121°27'E, dead, c. 80 m (1 v, C.165463) ; Great Australian Bight , between Eucla & Esperance, 33°08.3'– 33°33.3'S 128°66.7'–128°75' E, dead, 79–147 m (7 v, C.165457) ; NW of Bunbury , 33°15'S 114°32' E,dead, 201–228 m (7 v, WAM424.91 ) ; W of Rottnest Island , 32°0'S 115°15'E, dead, 146–150 m (2 v, C.165458) ; W of Rottnest Island , 31°59'S 115°14'E,dead, 182 m (1 v,C.338066) ; off Rottnest Island , 31°42.2'S 115°08.2' E,dead, 150 m (3 v, C.338067) ; off Rottnest Island, 31°40'S 115°09.3'E, dead (3 v, C.338064); off Rottnest Island , 31°38'S 115°08'E,dead, 140 m (2 v,C.165461) ; W of Rottnest Island , 31°0'S 114°51' E,dead, 256 m (1 v, C.165460) ; W of Rottnest Island , 30°59'S 114°51'E, dead, 229 m (3 v, C.165459) ; W of Cervantes Island , 30°33.5'S 114°40.5'E, dead, 192–196 m (1 v, C.338065) ; NW of Beagle Island , 29°43' S 114°17'E, dead, 274–283 m (4 v, C.165462) ; off North West Cape , 22°15.5'S 113°47.6'E, dead, 70 m (1 v, C.338063) ; c. 370 km W of Broome , 18°0'S 118°56'E, dead, 261 m (2 v [ var. obliqua ], C.157715) . TASMAN SEA: Lord Howe Shelf , 31°30'S 159°02' E, dead, 32.5 m (1 v, C.461409) . — PAPUA NEW GUINEA: Port Moresby, Ela Beach, 9°29'S 147°09'E, dead (14 v, C.165447); Amazon Bay , 10°18'S 149°20'E, dead (1 v, C.165448) .

Description. Shell small, fragile, up to c. 3 mm high, hyaline or opaque, valves dissimilar in shape, size and sculpture; prodissoconch of both valves similar, c. 245 µm in width, 135 µm in height (Dijkstra, 1995b: figs 87–88; Figs 21C, 23A), evenly and weakly convex, sculptured with many low, narrow, weakly defined radial ridgelets; contrasting strongly with that of Cyclochlamys nepeanensis in sculpture and in lack of central projection on left valve.

Left valve slightly larger and more convex than right valve, smooth except for a few minute commarginal growth lines (typical var.) or with more prominent commarginal lirae ( var. obliqua ); auricles almost equal, with some commarginal lines. Outer ligament insertion with small holes near resilifer (Dijkstra, 1995b: fig. 89).

Right valve smooth apart from faint hexagonal microsculpture (Dijkstra, 1995b: fig. 90). Anterior auricle with closely spaced commarginal lamellae. Byssal notch well developed.

Habitat. Living in the littoral zone (amongst algae) and in the bathyal zone amongst rubble on soft sediment (sand and mud).

Distribution. New Caledonia, 305–610 m (Dijkstra, 1995b); Fiji, 135–151 m (Dijkstra & Maestrati, 2008). Present material from Papua New Guinea (beached, dead) and Australia (northeastern Queensland southwards to New South Wales, Victoria and Tasmania, and westwards to South Australia and Western Australia up to Broome) (3–1000 m, alive).

Remarks. Chlamydella favus is variable in shape (almost circular to posteriorly oblique) and extremely variable in sculpture on the left valve (almost smooth to prominent commarginal, weak radial or reticulate sculpture, or intermediate variations). The specific epithet “favus” is an indeclinable noun (Latin, honeycomb), selected by Hedley (1902: 306) because of the hexagonal structure of the surface of the right valve.