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Table 1 Overview of endobiotic bacteria and their aggregates within the epidermic tip region of cerata from 12 nudibranch species

From: Endobacterial morphotypes in nudibranch cerata tips: a SEM analysis

Nudibranch groups Aeolidiacea Dendronotacea Arminiaceae
Species Aeolidia papillosa Berghia caerulescens Coryphella brownii Coryphella lineata Coryphella verrucosa Cuthona amoena Facelina coronata Flabellina pedata Dendronotus frondosus Doto coronata Tritonia plebeia Janolus cristatus
Aggregates and endobacterial morphology
Bacterial aggregates with envelope        
 Coccoid shaped bacteria (μm) 10/1.4a
4/0.5
6/0.8
13/0.9 r
ne/1.3 po
25/2.5   15/1.7   5/0.5 6/0.6     6/1.0
 Oval-shaped bacteria (μm)   5/0.8 × 1.3
No envelope
          4/0.8 × 1.6
Envelope
7/0.8 × 1.5
No envelope
Coccoid bacteria and aggregates without envelope (μm)     0.5
0.5 × 0.9 sp
        0.9
Dispersed coccoid endobionts (μm) 0.8 0.9 1.2    1.4 1.0 0.7 ca 2-4 μm 1.5 1.0  
Endobionts located closely to cnidocysts + + + + + nd. + + nd + + nd
  1. Nudibranch species selected prey on cnidarian diet (exception Janolus cristatus usually feeds on bryozoan Bugula sp.). Aggregate and bacterial sizes are approximate values
  2. nd not detected, ne not estimable, r rough surface, po polymorphic, sp spindle shaped
  3. aFirst number gives aggregate diameter and second refers to bacterial size, + detected