Ceradocus shoemakeri Fox, 1973

Krapp-Schickel, Traudl & Vader, Wim, 2009, On some Maerid genera (Crustacea, Amphipoda, Maeridae) collected by the Hourglass Cruises (Florida). Part 1: Genera Anamaera, Ceradocus, Clessidra gen. nov., Jerbarnia, Maera, Meximaera, with a key to world Ceradocus, Journal of Natural History 43 (33 - 34), pp. 2057-2086 : 2071-2073

Ceradocus shoemakeri Fox, 1973

( Figure 5 )

Ceradocus shoemakeri Fox, 1973: 147–152 , figs. 1–4; LeCroy, 2000: 73, fig. 121.

Type locality

Bahama Island .

Material examined

FSBC I 44754 : 22 specimens; 18 m; dredge; 14 November 1967; 26°24′ N, 82°28′ W . FSBC I 44837 : 1 slide; 18 m; dredge; 2 November 1967; 27°37′ N, 83°07′ W . FSBC I 44872 : 2; 37 m; dredge; 6 December 1966; 26°24′ N, 82°58′ W . FSBC I 44893 : 2; 73 m; dredge; 6 July 1967; 26°24′ N, 83°43′ W . FSBC I 45594 : 5; 37 m; 20 foot (6 m) balloon trynet; 2 November 1967; 27°37′ N 83°28′ W . FSBC I 45596 : 1; 18 m; dredge; 11 May 1967; 27°37′ N, 83°07′ W . FSBC I 45598 : 1; 37 m; dredge; 5 February 1967; 27°37′ N, 83°28′ W . FSBC I 45599 : 1; 73 m; 20 foot (6 m) balloon trynet; 7 April 1966; 27°37′ N, 84°13′ W . FSBC I 45600 : 1; 55 m; dredge; 5 September 1967; 26°24′ N, 83°22′ W . FSBC I 45601 : 1 slide male 5 mm; 12 specimens 73 m; 20 foot (6 m) balloon trynet; 5 September 1967; 27°37′ N, 84°13′ W . FSBC I 45602 : 7; 55 m; 20 foot (6 m) balloon trynet; 6 October 1967; 27°37′ N, 83°58′ W . FSBC I 45604 : 1 (bad); 73 m; 20 foot (6 m) balloon trynet; 1 September 1967; 27°37′ N, 84°37′ W . FSBC I 45608 : 3; 73 m; dredge; 2 Decmber 1966; 27°37′ N, 84°13′ W . FSBC I 45621 : 1; 55 m; dredge; 6 August 1966; 26°24′ N, 83°22′ W . FSBC I 45622 : 7; 37 m; 20 foot (6 m) balloon trynet; 21 November 1967; 27°37′ N, 83°28′ W . FSBC I 45629 : 37 m; dredge; 11 August 1967; 27°37′ N , 83°28′ WE. FSBC I 45631 : 5; 55 m; dredge; 7 June 1967; 26°24′ N, 83°22′ W . FSBC I 45632 : 2; 73 m; 20 foot balloon trynet; 6 July 1967; 26°24′ N, 83°43′ W . FSBC I 45635 : 2; 18 m; dredge; 1 August 1967; 27°37′ N, 83°07′ W . FSBC I 45636 : 5; 73 m; 20 foot balloon trynet; 2 December 1966; 27°37′ N, 84° 13′ W . FSBC I 45637 : 1 male; 1 slide; 55 m; 20 foot (6 m) balloon trynet; 5 September 1967; 26°24′ N, 83°22′ W . FSBC I 45638 : 1; 18 m; dredge; 6 June 1967; 26°24′ N, 82°28′ W . FSBC I 45639 : 13; 55 m; dredge; 12 May 1967; 27°37′ N, 83°58′ W . FSBC I 45640 : 1; 55 m; dredge; 6 July 1967; 26°24′ N, 83°22′ W . FSBC I 45641 : 1; 73 m; 20 foot (6 m) balloon trynet; 3 November 1967; 27°37′ N, 84°13′ W . FSBC I 45647 : 3; 55 m; dredge; 8 August 1967; 26°24′ N, 83°22′ W . FSBC I 45656 : 4; 55 m; 20 foot balloon trynet; 5 February 1967; 26°24′ N, 83°22′ W . FSBC I 45661 : 1; 37 m; 20 foot balloon trynet; 13 January 1967; 26°24′ N, 83°22′ W . FSBC I 45663 : 2; 55 m; 20 foot (6 m) balloon trynet; 12 October 1967; 26°24′ N, 83°22′ W . FSBC I 45668 (MSV): 4; 55 m; dredge; 16 February 1967; 26°24′ N, 83°22′ W . FSBC I 45669 : 2; 18 m; dredge; 15 May 1967; 26°24′ N, 82°28′ W .

Length

4–7 mm.

Features for regional diagnosis

Gn2 sexually dimorphic, in male asymmetrical, palmar margin of enlarged side straight, with two broad subquadrate processes (lacking on other side). Pleon segments posterodorsal margins entire, lacking teeth or serrations. Ep1–3 serrated. Us1,2 posterodorsal margin with single weak median tooth. T lobes subapical robust setae short.

Distribution

Bahama Islands ( Fox 1973); south Florida from Biscayne Bay south to the Dry Tortugas; Apalachee Bay and Perdido Key, Florida; Caribbean ( LeCroy 2000).

Ecology

Common on coral rubble, algae and sponge bottoms at depths of 0.5–6.0 m; also occasionally found in grassbeds ( LeCroy 2000). Here down to 73 m.

Figures

Figure 5. Ceradocus shoemakeri male 5 mm, FSBC I 45601. A1,2, antenna 1,2; Md, mandible; UL, upper lip; Gn1, gnathopod 1; Gn2, Gn2′, Gn2″, different shapes during allometric growth of gnathopod 2; P4, P7, peraeopod 4, 7; Ep1–3, epimeral plates 1–3; Ep3′, Ep3″ variations in serration of posterior margin of epimeral plate 3; Us 1,2, Us 1,2′, shape of two different urosome segments 1,2; u1,2, uropod 1,2; T, telson.