Pomponema veronicae, Cidreira & Pinheiro-Junior & Venekey & De Souza Alves, 2019

Cidreira, Gabriel, Pinheiro-Junior, Eraldo P., Venekey, Virág & De Souza Alves, Orane F., 2019, A new species of Pomponema Cobb, 1917 (Nematoda: Cyatholaimidae) from Northeast of Brazil, with reference to the taxonomic status of the genera Parapomponema Ott, 1972 and Propomponema Ott, 1972, Zootaxa 4691 (1), pp. 63-77: 65-69

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Pomponema veronicae

sp. n.

Pomponema veronicae   sp. n.

( Figures 2 View FIGURE 2 , 3 View FIGURE 3 , 4 View FIGURE 4 and 5 View FIGURE 5 ; Table 1)

Type material. Holotype male ( MNRJ-NEMA48)   ; paratypes: 7 males ( MNRJ-NEMA50, MPEG. NEM00202 View Materials , MPEG. NEM00203 View Materials , UFBA1401, UFBA1402, UFBA1403, UFBA1404), 5 females ( MNRJ-NEMA49, MNRJ- NEMA51, MPEG. NEM00204 View Materials , UFBA1405, UFBA1406) and 4 juveniles ( MNRJ-NEMA52, MPEG. NEM00205 View Materials , UFBA1407, UFBA1408). Pomponema veronicae   sp. n. was found in the three strata collected.  

Type locality. Intertidal zone of Itapuã beach (between 12°57’25”S, 38°21’13”W and 12°57’24”S, 38°21’19”W), northeast of Brazil. This beach is 1.5 km long ( Silva et al. 2009) and its sediment is composed of fine to medium sized sand grains ( Bittencourt 1975).

Etymology. The specific epithet is given in honor of the memory of professor Dr. Verônica Gomes da Fonsêca- Genevois, in recognition of her contribution to nematode ecology and taxonomy.

Description. Holotype and paratype males. Body slender, 1838 μm long (1708–1999 μm) ( Figs. 2A View FIGURE 2 and 3A View FIGURE 3 ). Cuticle with transverse rows of dots. Lateral differentiation consisting of two longitudinal rows of dots with transverse bars, beginning approximately at middle of pharynx ( Figs. 2D, 2E View FIGURE 2 and 3D View FIGURE 3 ). Head with six setiform inner labial sensilla, 9 μm long (9–10 μm) followed by six setiform outer labial sensilla, 21 μm long (20–23 μm). Cephalic setae difficult to observe probably because the outer labial setae are jointed in the same circle with cephalic setae, and so small and adherent to the six larger setae that they cannot be detected, or they are absent. Amphideal fovea dorsally multispiral with 4½ turns, 16 μm in diameter (16–17 μm), 49% of the corresponding body diameter (44–50%), situated at the level of buccal cavity ( Fig. 2B View FIGURE 2 ). Buccal cavity large, cheilostom with distinctly cuticularized twelve rugae and pharyngostom with a large pointed dorsal tooth, two subventral teeth, and pairs of denticles ( Figs. 2C View FIGURE 2 and 3C View FIGURE 3 ). Pharynx cylindrical, slightly enlarged posteriorly, but without forming a bulb ( Fig. 2D View FIGURE 2 ). Cardia not distinct. Nerve ring at 113 μm from anterior end (119–136 μm). Excretory pore opening at 134 μm from anterior end (127–148 μm). Two testes. Spicules slightly arched with distal expansion, 46 μm long (44–47 μm). Gubernaculum with two L-shaped lateral plates ( Figs. 2H View FIGURE 2 and 3F View FIGURE 3 ). Gubernaculum with a membrane at its distal end that connects to L-shaped plate. Ventral orifice at distal end of L-shaped plates present. Twenty precloacal supplements, 7–8 μm long (8–9 μm) and with 7–8 μm of distance between them (6–8 μm), consisting of an outer plate and an inner plate crossed by a fine canal ( Fig. 2G View FIGURE 2 ). Tail conico-cylindrical with a swollen tip and with short lateral setae, 7.9 of the anal body diameter (6.8–7.9) ( Figs. 2F View FIGURE 2 and 3E View FIGURE 3 ).

Paratype females. Similar to males in most morphological characters, except for smaller amphideal fovea diameter (10–14 µm), 33–34% of the corresponding body diameter with 3½ turns ( Fig. 4B View FIGURE 4 ), and tail slightly longer than males (266–336 µm). Reproductive system didelphic, amphidelphic, with gonads situated ventrally ( Figs. 4A, 4D View FIGURE 4 and 5D View FIGURE 5 ). Vulva slit-like, located approximately midway of body, 46–51% of total body length (843–1036 µm distant from anterior end).

Juveniles. Similar to adults, except for smaller size of morphological characters, fewer turns of amphideal fovea (3¼), absence of some characteristics such as supplements, and reproductive system immature.


Museu Paraense Emilio Goeldi