Camacolaimus spissus Allgén, 1959

Holovachov, Oleksandr & Boström, Sven, 2015, Swedish Plectida (Nematoda). Part 10. The genus Deontolaimus de Man, 1880, Zootaxa 4034 (1), pp. 1-44 : 36-37

Camacolaimus spissus Allgén, 1959

( Fig. 21 )

Type material. Lectotype female (slide # Type-8737) deposited in the invertebrate type collection of the Department of Zoology, Swedish Museum of Natural History, Stockholm, Sweden. Specimen is flattened, but is still in relatively good condition with larger structures recognizable.

Female. Body plump (flattened), fusiform, tapering anteriorly in anterior half of pharyngeal region and posteriorly on tail; strongly ventrally curved upon fixation, especially so along tail. Cuticle finely annulated. Lateral field, body pores, epidermal glands and subcephalic, cervical and somatic sensilla cannot be observed. Inner and outer labial, and cephalic sensilla indistinct. Amphid indistinct. Ocelli absent. Nerve ring, hemizonid and secretory-excretory system cannot be observed. Oral opening terminal. Onchiostyle relatively short and robust. Pharynx cylindrical anteriorly, expanding posteriorly; glandular; its posterior end indistinct. Nuclei of subventral pharyngeal glands distinct. Pharynx overall morphology is similar to that of Onchium Cobb, 1920 (see Holovachov, 2015). with strongly expanded dorsal glandular sector. Reproductive system didelphic, amphidelphic; ovary branches reflexed antidromously. Vagina indistinct. Rectum short. Tail conoid, straight. Spinneret acute, straight.

Discussion. Pharynx morphology in Camacolaimus spissus resembles that of the genus Onchium in having a distinct subventral pharyngeal gland cell located near half pharynx length, and with entire posterior part of pharynx being glandular with strongly granular content. It is considered species inquirenda et incerta sedis within the family Camacolaimidae .

Figures

FIGURE 21. Camacolaimus spissus Allgén, 1959, lectotype female. A: Anterior end; B: Tail, C: Entire female. Scale bars: A – B = 10 µm, C = 50 µm.