Ceratomyxa

Laamiri, Sayef, 2014, New observations on Myxozoa of the goldline sea bream Sarpa salpa L. 1758 (Teleostei: Sparidae) from the Mediterranean coast of Tunisia, Zootaxa 3887 (2), pp. 157-190: 166-167

publication ID

http://dx.doi.org/10.11646/zootaxa.3887.2.3

publication LSID

lsid:zoobank.org:pub:B697D6BA-836B-44E2-A8D9-07661554FE59

persistent identifier

http://treatment.plazi.org/id/038887C4-FFCD-FFD1-B3BB-F9FE836345BE

treatment provided by

Plazi

scientific name

Ceratomyxa
status

 

Ceratomyxa  sp. 1

Type host: Sarpa salpa Linnaeus, 1758  goldline sea bream ( Perciformes  : Sparidae  )

Type locality: Mediterranean off Tunisia, Gulf of Tunis (36 ° 45 ’N, 10 ° 15 ’E).

Site of infection: Within gall bladder

Prevalence: The overall prevalence is 2.1 % (7 / 330) ( Fig. 9View FIGURE 9). 0% (0/ 120) fish infected in the Bay of Bizerte. The infection was restricted to the Gulf of Tunis with prevalence 3.33 % (7 / 210) distributed as following, 03/ 2012: 0% (0/ 30); 04/ 2012: 23.3 % (7 / 30); 05/ 2012: 0% (0/ 30); 06/ 2012: 0% (0/ 30); 07/ 2012: 0% (0/ 30); 08/ 2012: 0% (0/ 30); 05/ 2013: 0% (0/ 20); 06/ 2013: 0% (0/ 10) (see Table 4).

Mean intensity: 47.1 ± 11.5 spores/infected fish (++++) ( Fig. 10View FIGURE 10) (see Table 4).

Type-material: Digitized photos of syntype spores were deposited in the parasitological collection of the Museum National d’Histoire Naturelle ( MNHN), Paris, Coll. No ZS 118.

Description

Vegetative stages. Trophozoïtes were freely floating in bile of the gallbladder in different stages of maturation and some seen attached to each others with their pseudopodia mostly short ( Fig. 4View FIGURE 4 A), Plasmodia (n = 30) were both monosporous and disporous ( Figs. 4View FIGURE 4 A –E), spherical to sub-spherical with variety of size, measuring 22.5 ± 4.23 (18.9–29.4) µm in length and 28.6 ± 6.43 (20.5–37.5) µm in width. Each plasmodium occupied one or two identical spores with some refractive granules.

Spores (n = 30 fresh spores). Spores typical of the genus Ceratomyxa  . Mature spores were elongated in sutural view ( Fig. 4View FIGURE 4 F, 8 D) measuring in 7.32 ± 0.52 (6.52–7.92) µm in length and in 29.32 ± 1.5 (27.8–31.8) µm in breadth of central portion and 67.98 ± 2.44 (64.9–70.1) µm in total thickness. Enlarged valves were greatly extended and presented almost the half of the length of the spore. They are twisted forming with the basal plane of the spore an angle high-pitched in each side α = 35.6 ± 12.3 (28–57 °) ( Fig. 4View FIGURE 4 F). Polar capsules were spherical and convergent 3.26 ± 0.23 (3–3.5) µm in length and 3.26 ± 0.23 (3–3.5) µm in width (n = 30). Numbers of turns of polar filament coil appeared to be 4–5. Sporoplasm finely granular and suture line perpendicular to the basal plane. Rarely, atypical spores with three valves, possessing three polar capsules, were observed ( Fig. 4View FIGURE 4 H).

Taxonomic affinities

The recent isolate species has a specific feature with the presence of enlarged valves “appendages” which make it distinguishable from other confamiliar known Ceratomyxa  spp. Over all the species of Ceratomyxa  described in Mediterranean Sea or from different part of the world, the current species appears to be morphologically similar only to one species C. taenia Davis, 1917  described from the gall bladder of elasmobranch species Scoliodon  terra-novae (Richardson, 1836) from the Atlantic Ocean ( USA) (see Table 1). However, the present finding can be clearly separated from C. taenia  by having spores larger in length and smaller in both breath of central part and total thickness. Furthermore, the average range of polar capsules of the current species is bigger than those of C. taenia  and the angle between the shell valves and the basal plane is high-pitched for present form while it is right for C. taenia  . On the other hand, the original report of C. taenia  noted that this species has merely a disporic plasmodia on the contrary to the present form. In view of the morphological differences, host and locality records, this species is considered distinct and designated as unknown species identified by the first time in sparid host S. salpa  from the Mediterranean Sea.

Ecological notes

During this study, the overall prevalence is 2.1 %. This myxosporean has a parasitic status as satellite species. Infection by Ceratomyxa  sp. 1 was restricted only in Gulf of Tunis and this species was detected only in April with prevalence 23.3 % and mean intensity 47.1 ± 11.5 spores per infected fish (see Table 4).

(measurements are in micrometer).

Species Host Locality Spore Polar capsule Length Breadth of Thickness Length Width central portion

Ceratomyxa  sp. 1 Sarpa salpa  Tunisia (Gulf of 7.32 29.32 67.98 3.26 3.26

(Present study) Tunis) (6.52–7.92) (27.8–31.8) (64.9–70.1) (3–3.5) (3–3.5)

C. taenia Davis, 1917  Scoliodon  USA (Atlantic 6 45 140–150 3 3 terra-novae ocean)

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Myxozoa

Class

Myxosporea

Order

Bivalvulida

Family

Ceratomyxidae

Loc

Ceratomyxa

Laamiri, Sayef 2014
2014
Loc

C. taenia

Davis 1917
1917