Ceradocus cf. 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 : 2073-2075

Ceradocus cf. shoemakeri

( Figure 6 )

Material examined

FSBC I 44556: 3; 18 m; 20 foot (6 m) balloon trynet; 5 October 1967; 27°37′ N, 83°28′ W . FSBC I 44564: 1; 37 m; 20 foot (6 m) balloon trynet; 20 May 1967; 27°37′ N, 83°28′ W . FSBC I 44603: 13; 55 m; 20 foot (6 m) balloon trynet; 1 September 1967; 27°37′ N, 83°58′ W . FSBC I 44607: 3; 55 m; 20 foot (6 m) balloon trynet; 21 November 1967; 27°37′ N, 83°58′ W . FSBC I 44755: 2; 55 m; 20 foot (6 m) balloon trynet; 7 June 1967; 26°24′ N; 83°22′ W . FSBC I 44888: 9; 55 m; 20 foot (6 m) balloon trynet; 1 September 1967; 27°37′ N, 83°58′ W . FSBC I 44894: 4; 55 m; dredge; 6 October 1967; 27°37′ N, 83°58′ W . FSBC I 44598: 1 slide; 37 m; 20 foot (6 m) balloon trynet; 7 August 1967; 26°24′ N, 82°58′ W . FSBC I 44603: 1; 37 m; 20 foot (6 m) balloon trynet; 31 August 1967; 27°37′ N, 83°28′ W . FSBC I 44646: 2; 18 m; dredge; 11 August 1967; 27°37′ N, 83°07′ W . FSBC I 44844: 2; 55 m; 20 foot (6 m) flat trynet; 13 November 1965; 26°24′ N, 83°22′ W . FSBC I 44862: 1; 73 m; dredge; 14 January 1966; 26°24′ N, 83°43′ W . FSBC I 44866: 5 females 5.5–7 mm; 55 m; dredge; 6 September 1966; 26°24′ N, 83°22′ W . FSBC I 45185 : 1 female slide; 6 m; dredge; 11 October 1967; 26°24′ N, 82°06′ W . FSBC I 45596: 1 slide; 18 m; dredge; 11 May 1967; 27°37′ N, 83°07′ W . FSBC I 45597: 37 m; dredge; 2 June 1967; 27°37′ N, 83°28′ W . FSBC I 45605: 1 specimen 4 mm; 37 m; 20 foot (6 m) balloon trynet; 5 February 1967; 27°37′ N, 83°28′ W . FSBC I 45610: 1; 55 m; 20 foot (6 m) balloon trynet; 20 November 1967; 27°37′ N, 83°58′ W . FSBC I 45613: 2; 55 m; 20 foot (6 m) balloon trynet; 12 September 1967; 27°37′ N, 83°58′ W . FSBC I 45618: 2; 73 m; 20 foot (6 m) balloon trynet; 12 October 1967; 26°24′ N, 83°43′ W . FSBC I 45622: 6; 37 m; 20 foot (6 m) balloon trynet; 21 November 1967; 27°37′ N, 83°28′ W . FSBC I 45644: 1 specimen 3.5 mm; 55 m; 20 foot (6 m) balloon trynet; 21 June 1967; 27°37′ N, 83°58′ W . FSBC I 45650: 2; one slide 6 mm; 55 m; 20 foot (6 m) balloon trynet; 6 July 1967; 26°24′ N, 83°22′ W . FSBC I 45651: 2; 55 m; dredge; 8 April 1967; 26°24′ N, 83°22′ W . FSBC I 45652: 1; 55 m; 20 foot (6 m) balloon trynet; 28 February 1967; 27°37′ N, 83°58′ W . FSBC I 45659: 2; 55 m; dredge; 15 November 1967; 26°24′ N, 83°22′ W .

Remarks

The unspecialized second gnathopods and short telsonic setae could also fit the females of C. paucidentatus (a species from California), but Ep2 should be smooth there. Also C. breweri is strikingly similar, especially based on the incomplete original description of a single female of 8 mm. In the description by Krapp-Schickel (2008a) of C. breweri from Florida the telsonic robust setae are different being clearly inserted on the inner side of the telsonic lobes and in a well-defined excavation, while both C. shoemakeri and the here discussed material have a much longer robust seta inserted on the outer margin of the telsonic lobes.

In C. shoemakeri the adult males have serrations also on Ep1, but these could develop with age; also the relative length of telsonic setation is reported as different with age (in younger specimens the robust setae are relatively longer). For the moment it seems quite probable that the above cited material belongs to this species.

Figures

Figure 6. Ceradocus cf. shoemakeri female 4.5 mm, FSBC I 45185. Gn1, gnathopod 1; Gn2, gnathopod 2; P3,4, peraeopod 3,4; Ep1–3, epimeral plates 1–3; T, telson.