Ceriantheomorphe ambonensis

Lopes, Celine S. S., Ceriello, Hellen, Morandini, Andre C. & Stampar, Sergio N., 2019, Revision of the genus Ceriantheomorphe (Cnidaria, Anthozoa, Ceriantharia) with description of a new species from the Gulf of Mexico and northwestern Atlantic, ZooKeys 874, pp. 127-148 : 127

Ceriantheomorphe ambonensis Fig. 6 A–B

Cerianthus ambonensis Kwietniewski, 1898: 426; Pax 1910: 167; McMurrich 1910: 26-28; Carlgren 1912: 44-47.

Cerianthus sulcatus McMurrich, 1910: 28-30.

Ceriantheomorphe ambonensis - Carlgren 1931: 1.

Material examined.

(MZSP 8476): • young individual (3.8 cm long) from Jakarta Bay, Indonesia, K. Cassiolato leg. (viii/2011) ( Fig. 6 A–B ).

Diagnosis.

Small cerianthid, 3.8 cm long and 2.1 cm wide. 48 marginal tentacles and 72 labial tentacles, both disposed in three cycles. Directive marginal and labial tentacles absent. Marginal tentacles arrangement: (0)1123.1121.1213.1213... Labial tentacles arrangement: (0)112.1121.1121.1121 … Pharynx occupies about 18% of total body length. Hyposulcus and hemisulci absent. Gastrovascular cavity occupies about 55% of total body length. Three pairs of protomesenteries, all connected to the siphonoglyph (directive mesenteries, P2 and P3). About 96 mesenteries arranged in M,B,m,b ( Fig. 7 ). Directive mesenteries shorter than all other mesenteries. Protomesenteries (P2) longer than all metamesenteries. Ratio of 4% between betamesenteries (B × b) and 2.2-3.5% between metamesenteries (M × m). Directive mesenteries, protomesenteries P2 and P3, occupy 2.3%, 85.7%, 14.2% of total gastrovascular cavity length, respectively. Cnidome ( Fig. 8 , Table 3 ) composed of spirocysts, microbasic b-mastigophores (six types), atrichous (one type), ptychocyst and holotrichous.

Distribution.

Indonesia, shallow waters.

Description of specimen.

Small individual, with 3.8 cm long and 2.1 cm wide. 48 marginal tentacles and 72 labial tentacles, both disposed in three cycles. Marginal tentacles arrangement: (0)1123.112 …, labial tentacles arrangement: (0)112.112.112 … Small pharynx, occupies 18% of total body length. Hyposulcus and hemisulci absent. Well-marked siphonoglyph with three pairs of mesenteries connected to it (one pair of directive mesenteries and two pairs of protomesenteries). Long protomesenteries (P2) extending to the terminal pore and longer than other mesenteries. Directive mesenteries shorter than all mesenteries. Protomesenteries (P3) shorter than metamesenteries (M and m) and longer than betamesenteries (B and b). 96 mesenteries arranged in M,B,m,b ( Fig. 6 ). Mesenteric filaments and craspedonemes present on initial portion of the gastrovascular cavity. Gastrovascular cavity occupies approximately 55% of the entire body length. Directive mesenteries and protomesenteries P3 occupy 2.3% and 14.2% of total gastrovascular cavity length, respectively, while protomesenteries P2 occupies 85.7%. Ratio of 2.2-3.5% between metamesenteries (M × m) and 4% between betamesenteries (B × b). Cnidome ( Fig. 7 ) composed of spirocysts, microbasic b- mastigophores (six types), atrichous (one type), ptychocyst and holotrichous.

Figures

Figure 6. Specimen of Ceriantheomorphe ambonensis (MZSP 8476). A Dissected specimen and B external morphology.

Figure 7. Mesenteries arrangement of Ceriantheomorphe ambonensis. MT Marginal tentacles LT Labial tentacles, M and m. Metamesenteries, B and b. Betamesenteries.

Figure 8. Cnidome of Ceriantheomorphe ambonensis. A Microbasic b-mastigophore type I B microbasic b-mastigophore type II C microbasic b-mastigophore type III D microbasic b-mastigophore type IV E microbasic b-mastigophore type V F microbasic b-mastigophore type VI G atrichous H holotrich I ptychocyst. Scale bars: 15 µm.