Pomponema veronicae,

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

Type material. Holotype male ( MNRJ-NEMA48)  ; paratypes: 7 males ( MNRJ-NEMA50, MPEG. NEM00202View Materials, MPEG. NEM00203View Materials, UFBA1401, UFBA1402, UFBA1403, UFBA1404), 5 females ( MNRJ-NEMA49, MNRJ- NEMA51, MPEG. NEM00204View Materials, UFBA1405, UFBA1406) and 4 juveniles ( MNRJ-NEMA52, MPEG. NEM00205View 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. 2AView FIGURE 2 and 3AView 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, 2EView FIGURE 2 and 3DView 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. 2BView 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. 2CView FIGURE 2 and 3CView FIGURE 3). Pharynx cylindrical, slightly enlarged posteriorly, but without forming a bulb ( Fig. 2DView 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. 2HView FIGURE 2 and 3FView 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. 2GView 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. 2FView FIGURE 2 and 3EView 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. 4BView FIGURE 4), and tail slightly longer than males (266–336 µm). Reproductive system didelphic, amphidelphic, with gonads situated ventrally ( Figs. 4A, 4DView FIGURE 4 and 5DView 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