Paracyatholaimus qingdaoensis, Huang & Xu, 2013

Huang, Yong & Xu, Kuidong, 2013, Two new species of the genus Paracyatholaimus Micoletzky (Nematoda: Cyatholaimidae) from the Yellow Sea, Journal of Natural History 47 (21 - 22), pp. 1381-1392 : 1382-1386

publication ID	https://doi.org/ 10.1080/00222933.2012.752544
DOI	https://doi.org/10.5281/zenodo.4742796
persistent identifier	https://treatment.plazi.org/id/0722740A-FFC9-FFCA-34EA-FC7426E6FC3E
treatment provided by	Carolina
scientific name	Paracyatholaimus qingdaoensis
status	sp. nov.

Treatment

Paracyatholaimus qingdaoensis sp. nov.

( Figures 1 View Figure 1 , 2 View Figure 2 )

Type material

Three males and four females were measured and studied. Holotype: ♂ 1, on slide HD090311-1; paratypes: ♂ 2, ♂ 3, ♀ 1, ♀ 2, ♀ 3, ♂ 4 on slides HD090311-1, HD090311- 2 and HD090311-3.

Type locality and habitat

Intertidal muddy sediment at Hongdao coast of Jiaozhou Bay (36 ◦ 20 ′ N, 120 ◦ 30 ′ E).

Etymology

This species is named with reference to the coastal city of the type locality.

Measurements

Measurements are given in Tables 1 View Table 1 and 2 View Table 2 .

Description

Male. Body cylindrical with little attenuation on both ends. Cuticle transversally annulated and punctated. The punctations about the same size along the body and closely arranged in transverse rows. No clear lateral differentiation. Body pores arranged in eight longitudinal rows.

Anterior end truncate. Mouth opening surrounded by six lips, inner labial sensilla hardly visible, the six outer labial setae and the four cephalic setae arranged in one circle. Four cephalic setae slightly shorter than six outer labial setae. Amphidial fovea multispirally coiled with four turns in the males and 3.5 turns in the female, situated at a distance (18 µm) from the apex.

Cheilostoma cup-shaped, its walls reinforced by bar-type rugae apparently 12 in number. Buccal cavity with one large pointed sclerotized dorsal tooth and two smaller ventrosublateral teeth.

Pharynx cylindrical, slightly widening posteriorly. Cardia poorly visible. Nerve ring not clear. Ventral gland and excretory pore hardly discernible.

Tail conical, thick and moderate length, with delicate terminal spinneret tube. A few longitudinal rows of short setae on the tail.

Diorchic; anterior testis outstretched, posterior smaller testis reflexed. Anterior testis situated to the right of the intestine, posterior testis to the left of the intestine. Spicules reverse S-shaped, distally pointed. Gubernaculum plate, with two cusps at distal end, parallel to the spicules. Ten thick setose supplements in a 5 + 5 arrangement. Anterior group of five supplements located at a protuberance.

Females. Similar to the males in most respects. Ovaries paired, opposed, reflexed, anterior ovary and posterior one 90 µm and 170 µm from vulva, respectively; vulva at post-midpoint of body length.

Differential diagnosis and discussion

Paracyatholaimus qingdaoensis sp. nov. is characterized by cylindrical body with conical tail; spicules reverse S-shaped, distally pointed; gubernaculum plate, with two cusps at distal end, parallel to the spicules; 10 thick setose precloacal supplements in a 5 + 5 arrangement, anterior group of five supplements located at a protuberance. The new species resembles Paracyatholaimus pentodon Riemann, 1966 in outline, but differs in number of amphidial spiral turns (four versus two), number and arrangement pattern of precloacal supplements (nine in even spaced versus 10 in a 5 + 5 arrangement), shape of spicules (S-shaped versus slender). The new species is closest to Paracyatholaimus helicellus Wieser, 1954 in the gubernacular shape, but differs in length of outer labial setae (7 µm versus 20.5 µm) and number of precloacal supplements (four versus ten).