Ceradocus sheardi Shoemaker, 1948

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 : 2065-2071

publication ID

https://doi.org/ 10.1080/00222930903091007

persistent identifier

https://treatment.plazi.org/id/03EE0604-FF89-D03F-E4CE-AB2BDE9EFCD4

treatment provided by

Felipe

scientific name

Ceradocus sheardi Shoemaker, 1948
status

 

Ceradocus sheardi Shoemaker, 1948

( Figures 3 View Figure 3 , 4 View Figure 4 )

Ceradocus sheardi Shoemaker, 1948: 7–9 , fig. 2; Thomas, 1993:43, fig. 56.

Type locality

Cuba.

1. Length

0:> 5 mm

1: ≤ 5 mm

2. A1 acc. flagellum

0: ≤ 3 arts

1: 4–10 arts

2:> 10 arts

3. Mdb palp art 3:2

0: art 3 shorter than half of art2

1: art 3 half of art2

4. Gn1 ratio propodus: carpus

0: propodus <carpus

1: subequal

2: propodus> carpus

5. Gn2 asymmetrical

0: yes

1: no

6. Gn 2 male larger palm

0: transverse or nearly transverse

1: oblique

7. Gn 2 male larger: propodus ratio length: breadth 0: <1.5

1: 1.5–1.8

2:> 1.8

8. Gn 2 male larger: palm incision(s)

0: present near corner

1: only shallow near corner

2: present medium

3: with broad molar-like hump(s)

4: present near dactylus insert

5: many

6: absent

9. P7 basis ratio length: breadth

0: <1.8

1: ≥ 1.8

10. Ep1 post. margin posteroventral*

0: serrated or uneven toothwaves

1: smooth

11. Ep1 inferior margin*

0: serrated or few incisions

1: smooth

12. Ep2 posterior margin posteroventrally*

0: serrated or toothwaves

1: smooth

13. Ep2 inferior (ventral) margin*

0: serrated or few incisions

1: smooth

(Continued)

14. Ep3 posterior margin posteroventrally*

0: serrated

1: smooth

15. Ep3 inferior margin*

0: serrated or few incisions

1: smooth

16. Metasome segment 1 posterior margin dorsally

0: serrated or at least one small tooth

1: smooth

17. Metasome segment 2 posterior margin dorsally

0: medial tooth large

1: medial tooth small

2: medial gap, lateral teeth

3: smooth

18. Metasome segment 3 posterior margin dorsally

0: normally rounded

1: produced

19. Us1,2 dorsally

0: smooth

1: dentate

20. U3 ratio rami: peduncle

0: <2.0

1: 2.0–2.5

2:> 2.5

21. U3 ratio external ramus ratio length: breadth

0: <4

1: 4–4.5

2:> 4.5

22. Telson lateral fine setae

0: present

1: absent

23. T subdistal robust setae

0: one, long

1: two or three, long

2: many

3: none

4: only short ones

24. Geographical distribution of type species

0: Atlantic

1: Pacific

2: New Zealand / Australia

3: South Africa / Madagascar /Mascarene Islands

4: Mediterranean

*Remarks on epimeral plates: authors have a

different opinion about the posterodistal corner of

the epimeral plates; we agree with Jerry Barnard

defining the corner as the end of the ridge, not the

largest tooth.

Material examined

FSBC I 44583 View Materials : 1; 18 m; dredge; 1 July 1967; 27°37′ N, 83°07′ W GoogleMaps . FSBC I 44751 View Materials : 14 specimems; 55 m; dredge; 12 May 1967; 27°37′ N, 83°58′ W GoogleMaps . FSBC I 44753 View Materials (MSV): 3 specimens; 18 m; dredge; 5 October 1967; 27°37′ N, 83°07′ W GoogleMaps . FSBC I 44807 View Materials : 1; 73 m; dredge; 13 June 1966; 26°24′ N 83°43′ W GoogleMaps . FSBC I 44808 View Materials : 7 adults and juveniles 4–7 mm; 55 m; dredge; 13 October 1966; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44810 View Materials : 7 (5 MSV); 55 m; dredge; 16 February 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44812 View Materials : 1 slide; 4 specimens; 73 m; 20 foot (6 m) flat trynet; 13 October 1966; 26°24′ N, 83°43′ W GoogleMaps . FSBC I 44813 View Materials : 5; 55 m; dredge; 7 June 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44814 View Materials : 1; 55 m; dredge; 21 May 1967; 27°37′ N, 83°58′ W GoogleMaps . FSBC I 44815 View Materials : 1; 37 m; 20 foot (6 m) balloon; 7 August 1967; 26°24′ N, 82°58′W GoogleMaps . FSBC I 44816 View Materials : 1 adult 7 mm, 1 juvenile 4 mm; 55 m; 20 foot (6 m) flat trynet; 15 February 1966; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44819 View Materials : 7 specimens alcohol, 1 slide; 55 m; dredge; 12 October 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44822 View Materials : 11 adults 5–8 mm; 37 m; dredge; 5 July 1967; 26°24′ N, 82°58′ W GoogleMaps . FSBC I 44823 View Materials : 1; 37 m; dredge; 1 August 1966; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44824 View Materials : 1 adult 7 mm; 55 m; dredge; 12 September 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44827 View Materials : 1; 55 m; 20 foot (6 m) flat trynet; 12 October 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44828 View Materials : 2; 73 m; 20 foot (6 m) flat trynet; 5 September 1967; 26°24′ N, 83°43′ W GoogleMaps . FSBC I 44835 View Materials : 4; 37 m; dredge; 20 May 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44837 View Materials : 47; 18 m; dredge; 2 November 1967; 27°37′ N, 83°07′ W GoogleMaps . FSBC I 44838 View Materials : 3; 73 m; dredge; 2 August 1967; 27°37′ N, 84°13′ W GoogleMaps . FSBC I 44843 View Materials : 4; 37 m; 20 foot (6 m) balloon trynet; 31 August 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44849 View Materials : 1 slide; 55 m; dredge; 21 November 1967; 27°37′ N, 83°58′ W GoogleMaps . FSBC I 44850 View Materials : 1; 37 m; dredge; 2 May 1966; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44851 View Materials : 1 adult damaged; 37 m; 20 foot (6 m) balloon trynet; 5 August 1966; 26°24′ N, 82°58′ W GoogleMaps . FSBC I 44856 View Materials : 14 adults 6–8 mm; 18 m; dredge; 14 November 1967; 26°24′ N, 82°28′ W GoogleMaps . FSBC I 44858 View Materials : 1; 37 m; dredge; 2 November 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44861 View Materials : 19; 55 m; dredge; 5 September 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44866 View Materials : 38 specimens, 1 slide; 55 m; dredge; 5 September 1966; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44875 View Materials : 5; 55 m; 20 foot (6 m) balloon trynet; 8 August 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44876 View Materials : 1; 55 m; 20 foot balloon trynet; 13 November 1965; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44877 View Materials : 1; 55 m; dredge; 6 August 1966; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44878 View Materials : 1 adult 7 mm; 37 m; dredge; 11 May 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44879 View Materials : 1; 37 m; dredge; 6 January 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 44880 View Materials : 4 adults 6–8 mm; 55 m; 20 foot (6 m) balloon trynet; 6 July 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44881 View Materials : 1 adult 5.5 mm; 73 m; dredge; 6 July 1967; 26°24′ N, 83°43′ W GoogleMaps . FSBC I 44882 View Materials : 5; 55 m; dredge; 8 April 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44883 View Materials : 6; 55 m; 20 foot (6 m) balloon trynet; 12 October 1967; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44884 View Materials : 1 male 9 mm slide; 55 m; dredge; 7 December 1966; 26°24′ N, 83°22′ W GoogleMaps . FSBC I 44885 View Materials : 1 adult, 1 juvenile; 18 m; dredge; 31 August 1967; 27°37′ N, 83°07′ W GoogleMaps . FSBC I 45622 View Materials : 3; 37 m; 20 foot (6 m) balloon trynet; 21 November 1967; 27°37′ N, 83°28′ W GoogleMaps . FSBC I 45659 View Materials : 5; 55 m; dredge; 15 November 1967; 26°24′ N, 83°22′ W GoogleMaps .

Length

9–16 mm.

Features for regional diagnosis

Gn2 not sexually dimorphic, not asymmetrical, palmar margin sinuous, without processes. P7 basis with posteroventral angle rectangular, not projecting into acute lobe. Pleon segments with strong teeth and serrations. Ep1–3 serrated. Us segments 1,2 with teeth. T lobes acutely ending, with strong subapical robust seta (and small additional ones).

Distribution

Atlantic Ocean: Biscayne Bay to Dry Tortugas; Belize, Yucatan, Mexico ( Shoemaker 1948; Thomas 1993; LeCroy 2000); Cuba ( Shoemaker 1948; Ortiz 1974); Puerto Rico ( LeCroy 2000).

Ecology

Rubble zone, lagoon, forereef, 1–2 m: under rocks on sandy bottoms ( Thomas, 1993); down to 52 m ( Thomas, 1993). Here down to 73 m.

Colour

Pure transparent white; U1,2 rami faint salmon pink; eyes dark red, divisions white [Shoemaker’s unpublished colour notes based on live material from Dry Tortugas (fide LeCroy 2000)]; ivory ( Thomas 1993).

T

Tavera, Department of Geology and Geophysics

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Amphipoda

Family

Maeridae

Genus

Ceradocus

Loc

Ceradocus sheardi Shoemaker, 1948

Krapp-Schickel, Traudl & Vader, Wim 2009
2009
Loc

Ceradocus sheardi

Thomas JD 1993: 43
Shoemaker CR 1948: 9
1948