Bolbonema brevicolle Cobb 1920
Creators: name: Armenteros, Maickel
name: Ruiz-Abierno, Alexei
name: Decraemer, Wilfrida
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Desmodorida
Desmodoridae
Bolbonema
Bolbonema brevicolle

description: Bolbonema brevicolle Cobb, 1920
Figs 1E–F, 3, Table 1
Bolbonema brevicolle Cobb, 1920: 264.
Desmodora (Bolbonema) brevicolle – Gerlach 1963: 90.
Material examined
6 ♂♂, 7 ♀♀ and 1 juvenile, deposited in the nematode collection at Centro de Investigaciones Marinas, Universidad de La Habana, CUBA.
Description
Cuticle annulated in the anterior region (annuli 0.6–0.8 μm width) becoming finely striated at midbody (0.2–0.3 µm). Head capsule well developed, surface appearing with a fingerprint pattern by LM, SEM microphotographs suggest some depressions in the surface. Six inner and six outer labial sensilla papilliform. Four cephalic sensilla (10–13 μm long) at the base of the head capsule, four subcephalic setae (6–8 µm long) next to the cephalic ones. Amphidial fovea cryptospiral, relatively large, posterior border is in contact with cuticle striations. Eight longitudinal rows of somatic setae running from cervical region to level of anus; long setae (18–22 μm long) alternate with two shorter setae (~ 4 μm long). Buccal cavity small, with one small dorsal tooth and two ventrosublateral denticles, not always visible. Pharynx muscular with well-developed posterior bulb and plasmatic interruptions. Cardia and excretory-secretory system not observable. Tail region with only four longitudinal rows of setae.
Male monorchic; anterior testis to the right of the intestine. Spicule capitulum with a characteristic ventral process. No precloacal supplements.
Female didelphic, ovaries antidromously reflexed and both genital branches to the right of the intestine. Vulva a simple transversal slit-like aperture.
Juveniles are similar to adults except for the development of the reproductive system.
Remarks
Our specimens largely agree with the original description of this species by Cobb (1920) and redescriptions by Gerlach (1963) and Pastor de Ward (1988). The single clear difference in our specimens is the presence of four subcephalic setae in subdorsal and subventral positions slightly smaller than the four cephalic sensilla and inserted closely to the latter (Fig. 3B). These setae were clearly visible with SEM and could have been overlooked by mentioned authors in LM; actually, we could not see them clearly in all specimens. The body length shows some variation for the different populations with a considerably smaller female (737 μm) described by Gerlach (1963), and larger specimens described by Pastor de Ward (1988) (range: 1550–1950 µm). The range of body length of our specimens is more in agreement with the type specimens (males: 1051–1372 µm, females: 942– 1387 µm) and it is closer to the holotype described by Cobb (1920) (female: ~ 1300 µm). The cuticle heterogeneity in annulation is quite marked in B. brevicolle with the anterior annuli being rings three-fold wider than the striation in the posterior region; however, this feature has not been mentioned in previous descriptions.
description: Published as part of Armenteros, Maickel, Ruiz-Abierno, Alexei & Decraemer, Wilfrida, 2014, Revision of Desmodorinae and Spiriniinae (Nematoda: Desmodoridae) with redescription of eight known species, pp. 1-32 in European Journal of Taxonomy 96 on page 8, DOI: 10.5852/ejt.2014.96, http://zenodo.org/record/3838898