Oikopleura longicauda (Vogt, 1854)

Appendicularia longicauda Vogt 1854: 74, Pl. 10 Figs. 4 –6.

Oikopleura spissa Fol 1872: 470–471, Pl. 2 Fig. 8, Pl. 3 Figs. 1–4. Lohmann 1896: 59.

Oikopleura (Coecaria) longicauda: Tokioka 1960: 354 .

Oikopleura longicauda: Lohmann 1896: 59, Pls. 9, 10 Fig. 7. Bückmann 1969: 5, Fig. 8a–c. Fenaux 1993: 58, 71, 79; 1998: 300, 301. Aravena & Palma 2002: 312, Fig. 4A.

Material examined. Ten specimens (MDAFWU 2020 /401–410), St.205, January 2020 .

Description. Trunk 1–1.5 mm long, compact. Strongly developed velum extending dorsally over the trunk. Mouth with a long lower lip without oral glands. Left lobe of the stomach with a small finger-shaped postcardial caecum directed upwards. Rectum extending slightly beyond the oral wall of the stomach. Gonads adjoining the coil of the gut, and embracing it laterally in mature individuals; the ovary is placed above the testis. Tail musculature broad and the subchordal cells absent.

Global distribution. The Antarctic Ocean, Atlantic Ocean, Indian Ocean, Pacific Ocean, the Mediterranean Sea and Red Sea (Fenaux et al. 1998); Australian waters (Thompson 1948). Type locality: off Nice, Mediterranean Sea.